From: H.J. Lu <hongjiu.lu@intel.com>
Date: Sat, 4 Sep 2004 00:15:42 +0000 (+0000)
Subject: re PR target/14925 (libunwind enabled gcc generates incompatible libgcc_s.so.1)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=443728bba4b4ec9b9177121022571b036a8b01bf;p=gcc.git

re PR target/14925 (libunwind enabled gcc generates incompatible libgcc_s.so.1)

2004-09-03  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/14925:
	Makefile.in (LIB2ADDEHSTATIC): New.
	(LIB2ADDEHSHARED): New.
	(LIBUNWIND): New.
	(LIBUNWINDDEP): New.
	(SHLIBUNWIND_LINK): New.
	(SHLIBUNWIND_INSTALL): New.
	(libgcc.mk): Pass LIB2ADDEHSTATIC, LIB2ADDEHSHARED, LIBUNWIND,
	LIBUNWINDDEP, SHLIBUNWIND_LINK and SHLIBUNWIND_INSTALL.
	(clean): Remove libunwind*
	(stage1-start): Remove and copy stage1/libunwind*.
	(stage2-start): Remove and copy stage2/libunwind*.
	(stage3-start): Remove and copy stage3/libunwind*.
	(stage4-start): Remove and copy stage4/libunwind*.
	(stageprofile-start): Remove and copy stageprofile/libunwind*.
	(stagefeedback-start): Remove and copy stagefeedback/libunwind*.

	* config.gcc (ia64*-*-linux*): Always add t-libunwind to
	tmake_file. Add t-libunwind-elf and ia64/t-glibc-libunwind to
	tmake_file if --with-system-libunwind isn't used.

	* config/ia64/t-glibc-libunwind: New file.
	* config/t-libunwind-elf: Likewise.
	* unwind-compat.c: Likewise.
	* unwind-compat.h: Likewise.
	* unwind-dw2-fde-compat.c: Likewise.

	* config/ia64/t-glibc (LIB2ADDEH): Updated.
	* config/ia64/t-hpux (T_CFLAGS): Add -DUSE_LIBUNWIND_EXCEPTIONS.

	* config/ia64/unwind-ia64.c: Include "unwind-compat.h". Define
	aliases if needed.
	* unwind-dw2-fde-glibc.c: Likewise.
	* unwind-dw2.c: Likewise.

	* config/t-libunwind (LIB2ADDEH): Updated.
	(LIB2ADDEHSTATIC): New.
	(T_CFLAGS): Add -DUSE_LIBUNWIND_EXCEPTIONS.
	(TARGET_LIBGCC2_CFLAGS): Set to -DUSE_GAS_SYMVER.

	* configure.ac: Change --enable-libunwind-exceptions to
	--with-system-libunwind. Don't define USE_LIBUNWIND_EXCEPTIONS.
	* configure: Regenerated.
	* config.in: Updated.

	* doc/install.texi (ia64-*-linux): Require libunwind 0.98 or
	above and mention --with-system-libunwind.
	(ia64-*-hpux*): Mention --enable-libunwind-exceptions is
	removed in gcc 3.4.3 and later.

	* gcc.c (init_spec): Add -lunwind to -lgcc_s if
	USE_LIBUNWIND_EXCEPTIONS is defined.

	* mklibgcc.in: Support libunwind.

From-SVN: r87066
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 02b82890f90..743aad8cafd 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,60 @@
+2004-09-03  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/14925:
+	Makefile.in (LIB2ADDEHSTATIC): New.
+	(LIB2ADDEHSHARED): New.
+	(LIBUNWIND): New.
+	(LIBUNWINDDEP): New.
+	(SHLIBUNWIND_LINK): New.
+	(SHLIBUNWIND_INSTALL): New.
+	(libgcc.mk): Pass LIB2ADDEHSTATIC, LIB2ADDEHSHARED, LIBUNWIND,
+	LIBUNWINDDEP, SHLIBUNWIND_LINK and SHLIBUNWIND_INSTALL.
+	(clean): Remove libunwind*
+	(stage1-start): Remove and copy stage1/libunwind*.
+	(stage2-start): Remove and copy stage2/libunwind*.
+	(stage3-start): Remove and copy stage3/libunwind*.
+	(stage4-start): Remove and copy stage4/libunwind*.
+	(stageprofile-start): Remove and copy stageprofile/libunwind*.
+	(stagefeedback-start): Remove and copy stagefeedback/libunwind*.
+
+	* config.gcc (ia64*-*-linux*): Always add t-libunwind to
+	tmake_file. Add t-libunwind-elf and ia64/t-glibc-libunwind to
+	tmake_file if --with-system-libunwind isn't used.
+
+	* config/ia64/t-glibc-libunwind: New file.
+	* config/t-libunwind-elf: Likewise.
+	* unwind-compat.c: Likewise.
+	* unwind-compat.h: Likewise.
+	* unwind-dw2-fde-compat.c: Likewise.
+
+	* config/ia64/t-glibc (LIB2ADDEH): Updated.
+	* config/ia64/t-hpux (T_CFLAGS): Add -DUSE_LIBUNWIND_EXCEPTIONS.
+
+	* config/ia64/unwind-ia64.c: Include "unwind-compat.h". Define
+	aliases if needed.
+	* unwind-dw2-fde-glibc.c: Likewise.
+	* unwind-dw2.c: Likewise.
+
+	* config/t-libunwind (LIB2ADDEH): Updated.
+	(LIB2ADDEHSTATIC): New.
+	(T_CFLAGS): Add -DUSE_LIBUNWIND_EXCEPTIONS.
+	(TARGET_LIBGCC2_CFLAGS): Set to -DUSE_GAS_SYMVER.
+
+	* configure.ac: Change --enable-libunwind-exceptions to
+	--with-system-libunwind. Don't define USE_LIBUNWIND_EXCEPTIONS.
+	* configure: Regenerated.
+	* config.in: Updated.
+
+	* doc/install.texi (ia64-*-linux): Require libunwind 0.98 or
+	above and mention --with-system-libunwind.
+	(ia64-*-hpux*): Mention --enable-libunwind-exceptions is
+	removed in gcc 3.4.3 and later.
+
+	* gcc.c (init_spec): Add -lunwind to -lgcc_s if
+	USE_LIBUNWIND_EXCEPTIONS is defined.
+
+	* mklibgcc.in: Support libunwind.
+
 2004-09-03  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* config/i386/i386.c (x86_branch_hints): Remove m_PENT4 and
diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 3654ff09c8d..5990d2a7ec8 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -532,8 +532,16 @@ CRTSTUFF_CFLAGS = -O2 $(GCC_CFLAGS) $(INCLUDES) $(MULTILIB_CFLAGS) -g0 \
 # Additional sources to handle exceptions; overridden by targets as needed.
 LIB2ADDEH = $(srcdir)/unwind-dw2.c $(srcdir)/unwind-dw2-fde.c \
    $(srcdir)/unwind-sjlj.c $(srcdir)/gthr-gnat.c $(srcdir)/unwind-c.c
+LIB2ADDEHSTATIC = $(LIB2ADDEH)
+LIB2ADDEHSHARED = $(LIB2ADDEH)
 LIB2ADDEHDEP = unwind.h unwind-pe.h unwind.inc unwind-dw2-fde.h unwind-dw2.h
 
+# Don't build libunwind by default.
+LIBUNWIND =
+LIBUNWINDDEP =
+SHLIBUNWIND_LINK =
+SHLIBUNWIND_INSTALL =
+
 # nm flags to list global symbols in libgcc object files.
 SHLIB_NM_FLAGS = -pg
 
@@ -1205,7 +1213,13 @@ libgcc.mk: config.status Makefile mklibgcc $(LIB2ADD) $(LIB2ADD_ST) xgcc$(exeext
 	LIB2ADD='$(LIB2ADD)' \
 	LIB2ADD_ST='$(LIB2ADD_ST)' \
 	LIB2ADDEH='$(LIB2ADDEH)' \
+	LIB2ADDEHSTATIC='$(LIB2ADDEHSTATIC)' \
+	LIB2ADDEHSHARED='$(LIB2ADDEHSHARED)' \
 	LIB2ADDEHDEP='$(LIB2ADDEHDEP)' \
+	LIBUNWIND='$(LIBUNWIND)' \
+	LIBUNWINDDEP='$(LIBUNWINDDEP)' \
+	SHLIBUNWIND_LINK='$(SHLIBUNWIND_LINK)' \
+	SHLIBUNWIND_INSTALL='$(SHLIBUNWIND_INSTALL)' \
 	FPBIT='$(FPBIT)' \
 	FPBIT_FUNCS='$(FPBIT_FUNCS)' \
 	LIB2_DIVMOD_FUNCS='$(LIB2_DIVMOD_FUNCS)' \
@@ -3051,6 +3065,7 @@ mostlyclean: lang.mostlyclean
 clean: mostlyclean lang.clean
 	-rm -f libgcc.a libgcc_eh.a libgcov.a
 	-rm -f libgcc_s$(SHLIB_EXT) libgcc_s$(SHLIB_EXT).1
+	-rm -f libunwind*
 	-rm -f config.h tconfig.h bconfig.h tm_p.h tm.h
 	-rm -f options.c options.h optionlist
 	-rm -f cs-*
@@ -3880,6 +3895,7 @@ stage1-start:
 	-if [ -f collect-ld$(exeext) ] ; then (cd stage1 && $(LN_S) ../collect-ld$(exeext) .) ; else true ; fi
 	-rm -f stage1/libgcc.a stage1/libgcc_eh.a stage1/libgcov.a
 	-rm -f stage1/libgcc_s*$(SHLIB_EXT)
+	-rm -f stage1/libunwind*
 	-cp libgcc.a stage1
 	-$(RANLIB_FOR_TARGET) stage1/libgcc.a
 	-cp libgcov.a stage1
@@ -3888,6 +3904,7 @@ stage1-start:
 	   $(RANLIB_FOR_TARGET) stage1/libgcc_eh.a; \
 	fi
 	-cp libgcc_s*$(SHLIB_EXT) stage1
+	-cp libunwind* stage1
 	-for f in .. $(EXTRA_MULTILIB_PARTS); do if [ x$${f} != x.. ]; then \
 	  cp stage1/$${f} . ; \
 	else true; \
@@ -3915,6 +3932,7 @@ stage2-start:
 	-if [ -f collect-ld$(exeext) ] ; then (cd stage2 && $(LN_S) ../collect-ld$(exeext) .) ; else true ; fi
 	-rm -f stage2/libgcc.a stage2/libgcov.a stage2/libgcc_eh.a
 	-rm -f stage2/libgcc_s*$(SHLIB_EXT)
+	-rm -f stage2/libunwind*
 	-cp libgcc.a stage2
 	-$(RANLIB_FOR_TARGET) stage2/libgcc.a
 	-cp libgcov.a stage2
@@ -3923,6 +3941,7 @@ stage2-start:
 	   $(RANLIB_FOR_TARGET) stage2/libgcc_eh.a; \
 	fi
 	-cp libgcc_s*$(SHLIB_EXT) stage2
+	-cp libunwind* stage2
 	-for f in .. $(EXTRA_MULTILIB_PARTS); do if [ x$${f} != x.. ]; then \
 	  cp stage2/$${f} . ; \
 	else true; \
@@ -3946,6 +3965,7 @@ stage3-start:
 	-if [ -f collect-ld$(exeext) ] ; then (cd stage3 && $(LN_S) ../collect-ld$(exeext) .) ; else true ; fi
 	-rm -f stage3/libgcc.a stage3/libgcov.a stage3/libgcc_eh.a
 	-rm -f stage3/libgcc_s*$(SHLIB_EXT)
+	-rm -f stage3/libunwind*
 	-cp libgcc.a stage3
 	-$(RANLIB_FOR_TARGET) stage3/libgcc.a
 	-cp libgcov.a stage3
@@ -3954,6 +3974,7 @@ stage3-start:
 	   $(RANLIB_FOR_TARGET) stage3/libgcc_eh.a; \
 	fi
 	-cp libgcc_s*$(SHLIB_EXT) stage3
+	-cp libunwind* stage3
 	-for f in .. $(EXTRA_MULTILIB_PARTS); do if [ x$${f} != x.. ]; then \
 	  cp stage3/$${f} . ; \
 	else true; \
@@ -3977,6 +3998,7 @@ stage4-start:
 	-if [ -f collect-ld$(exeext) ] ; then (cd stage4 && $(LN_S) ../collect-ld$(exeext) .) ; else true ; fi
 	-rm -f stage4/libgcc.a stage4/libgcov.a stage4/libgcc_eh.a
 	-rm -f stage4/libgcc_s*$(SHLIB_EXT)
+	-rm -f stage4/libunwind*
 	-cp libgcc.a stage4
 	-$(RANLIB_FOR_TARGET) stage4/libgcc.a
 	-cp libgcov.a stage4
@@ -3985,6 +4007,7 @@ stage4-start:
 	   $(RANLIB_FOR_TARGET) stage4/libgcc_eh.a; \
 	fi
 	-cp libgcc_s*$(SHLIB_EXT) stage4
+	-cp libunwind* stage4
 	-for f in .. $(EXTRA_MULTILIB_PARTS); do if [ x$${f} != x.. ]; then \
 	  cp stage4/$${f} . ; \
 	else true; \
@@ -4006,6 +4029,7 @@ stageprofile-start:
 	-if [ -f collect-ld$(exeext) ] ; then (cd stageprofile && $(LN_S) ../collect-ld$(exeext) .) ; else true ; fi
 	-rm -f stageprofile/libgcc.a stageprofile/libgcov.a stageprofile/libgcc_eh.a
 	-rm -f stageprofile/libgcc_s*$(SHLIB_EXT)
+	-rm -f stageprofile/libunwind*
 	-cp libgcc.a stageprofile
 	-$(RANLIB_FOR_TARGET) stageprofile/libgcc.a
 	-cp libgcov.a stageprofile
@@ -4014,6 +4038,7 @@ stageprofile-start:
 	   $(RANLIB_FOR_TARGET) stageprofile/libgcc_eh.a; \
 	fi
 	-cp libgcc_s*$(SHLIB_EXT) stageprofile
+	-cp libunwind* stageprofile
 	-for f in .. $(EXTRA_MULTILIB_PARTS); do if [ x$${f} != x.. ]; then \
 	  cp stageprofile/$${f} . ; \
 	else true; \
@@ -4035,6 +4060,7 @@ stagefeedback-start:
 	-if [ -f collect-ld$(exeext) ] ; then (cd stagefeedback && $(LN_S) ../collect-ld$(exeext) .) ; else true ; fi
 	-rm -f stagefeedback/libgcc.a stagefeedback/libgcov.a stagefeedback/libgcc_eh.a
 	-rm -f stagefeedback/libgcc_s*$(SHLIB_EXT)
+	-rm -f stagefeedback/libunwind*
 	-rm -f *.da
 	-for dir in fixinc po testsuite $(SUBDIRS); \
 	 do \
@@ -4048,6 +4074,7 @@ stagefeedback-start:
 	   $(RANLIB_FOR_TARGET) stagefeedback/libgcc_eh.a; \
 	fi
 	-cp libgcc_s*$(SHLIB_EXT) stagefeedback
+	-cp libunwind* stagefeedback
 	-for f in .. $(EXTRA_MULTILIB_PARTS); do if [ x$${f} != x.. ]; then \
 	  cp stagefeedback/$${f} . ; \
 	else true; \
diff --git a/gcc/config.gcc b/gcc/config.gcc
index 79c5e878bd4..4f955a02b62 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1148,12 +1148,12 @@ ia64*-*-freebsd*)
 	;;
 ia64*-*-linux*)
 	tm_file="${tm_file} dbxelf.h elfos.h svr4.h linux.h ia64/sysv4.h ia64/linux.h"
-	tmake_file="${tmake_file} ia64/t-ia64 ia64/t-glibc"
+	tmake_file="${tmake_file} ia64/t-ia64 t-libunwind ia64/t-glibc"
+	if test x$with_system_libunwind != xyes ; then
+		tmake_file="${tmake_file} t-libunwind-elf ia64/t-glibc-libunwind"
+	fi
 	target_cpu_default="MASK_GNU_AS|MASK_GNU_LD"
 	extra_parts="crtbegin.o crtend.o crtbeginS.o crtendS.o crtfastmath.o"
-	if test x"$use_libunwind_exceptions" = xyes; then
-	  tmake_file="$tmake_file t-libunwind"
-	fi
 	;;
 ia64*-*-hpux*)
 	tm_file="${tm_file} dbxelf.h elfos.h svr4.h ia64/sysv4.h ia64/hpux.h"
diff --git a/gcc/config.in b/gcc/config.in
index f169e6dfdb1..42e5795e6f6 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -573,9 +573,6 @@
 /* Define if your assembler mis-optimizes .eh_frame data. */
 #undef USE_AS_TRADITIONAL_FORMAT
 
-/* Define if gcc should use -lunwind. */
-#undef USE_LIBUNWIND_EXCEPTIONS
-
 /* Define to 1 if the 'long long' (or '__int64') is wider than 'long' but
    still efficiently supported by the host hardware. */
 #undef USE_LONG_LONG_FOR_WIDEST_FAST_INT
diff --git a/gcc/config/ia64/t-glibc b/gcc/config/ia64/t-glibc
index a1056628b50..df4fe9c4404 100644
--- a/gcc/config/ia64/t-glibc
+++ b/gcc/config/ia64/t-glibc
@@ -1 +1,3 @@
-LIB2ADDEH += $(srcdir)/config/ia64/fde-glibc.c
+# Use system libunwind library on IA-64 GLIBC based system.
+LIB2ADDEH = $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c \
+  $(srcdir)/unwind-compat.c
diff --git a/gcc/config/ia64/t-glibc-libunwind b/gcc/config/ia64/t-glibc-libunwind
new file mode 100644
index 00000000000..df78f1d094f
--- /dev/null
+++ b/gcc/config/ia64/t-glibc-libunwind
@@ -0,0 +1,4 @@
+# Build libunwind for IA-64 GLIBC based system.
+LIBUNWIND = $(srcdir)/config/ia64/fde-glibc.c \
+  $(srcdir)/config/ia64/unwind-ia64.c
+LIBUNWINDDEP = unwind.inc
diff --git a/gcc/config/ia64/t-hpux b/gcc/config/ia64/t-hpux
index 597c2acbe2a..d89f174592c 100644
--- a/gcc/config/ia64/t-hpux
+++ b/gcc/config/ia64/t-hpux
@@ -23,6 +23,8 @@ LIBGCC1_TEST =
 # We do not want to include the EH stuff that linux uses, we want to use
 # the HP-UX libunwind library.
 
+T_CFLAGS += -DUSE_LIBUNWIND_EXCEPTIONS
+
 LIB2ADDEH =
 
 SHLIB_EXT = .so
diff --git a/gcc/config/ia64/unwind-ia64.c b/gcc/config/ia64/unwind-ia64.c
index 1c88b729064..692f07b1adf 100644
--- a/gcc/config/ia64/unwind-ia64.c
+++ b/gcc/config/ia64/unwind-ia64.c
@@ -37,6 +37,7 @@
 #include "tm.h"
 #include "unwind.h"
 #include "unwind-ia64.h"
+#include "unwind-compat.h"
 #include "ia64intrin.h"
 
 /* This isn't thread safe, but nice for occasional tests.  */
@@ -2381,4 +2382,24 @@ uw_identify_context (struct _Unwind_Context *context)
 }
 
 #include "unwind.inc"
+
+#if defined (USE_GAS_SYMVER) && defined (SHARED) && defined (USE_LIBUNWIND_EXCEPTIONS)
+alias (_Unwind_Backtrace);
+alias (_Unwind_DeleteException);
+alias (_Unwind_FindEnclosingFunction);
+alias (_Unwind_FindTableEntry);
+alias (_Unwind_ForcedUnwind);
+alias (_Unwind_GetBSP);
+alias (_Unwind_GetCFA);
+alias (_Unwind_GetGR);
+alias (_Unwind_GetIP);
+alias (_Unwind_GetLanguageSpecificData);
+alias (_Unwind_GetRegionStart);
+alias (_Unwind_RaiseException);
+alias (_Unwind_Resume);
+alias (_Unwind_Resume_or_Rethrow);
+alias (_Unwind_SetGR);
+alias (_Unwind_SetIP);
+#endif
+
 #endif
diff --git a/gcc/config/t-libunwind b/gcc/config/t-libunwind
index 2204ae316d7..121ce2e47b6 100644
--- a/gcc/config/t-libunwind
+++ b/gcc/config/t-libunwind
@@ -1,5 +1,12 @@
+# Use the system libunwind library.
+#
 # Override the default value from t-slibgcc-elf-ver and mention -lunwind
 # so that the resulting libgcc_s.so has the necessary DT_NEEDED entry for
 # libunwind.
 SHLIB_LC = -lunwind -lc
-LIB2ADDEH = $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c
+LIB2ADDEH = $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c \
+  $(srcdir)/unwind-compat.c $(srcdir)/unwind-dw2-fde-compat.c
+LIB2ADDEHSTATIC = $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c
+
+T_CFLAGS += -DUSE_LIBUNWIND_EXCEPTIONS
+TARGET_LIBGCC2_CFLAGS += -DUSE_GAS_SYMVER
diff --git a/gcc/config/t-libunwind-elf b/gcc/config/t-libunwind-elf
new file mode 100644
index 00000000000..ac94fac4ab0
--- /dev/null
+++ b/gcc/config/t-libunwind-elf
@@ -0,0 +1,26 @@
+# Build libunwind for ELF with the GNU linker.
+
+# Use unwind-dw2-fde-glibc
+LIBUNWIND = $(srcdir)/unwind-dw2.c $(srcdir)/unwind-dw2-fde-glibc.c
+LIBUNWINDDEP = unwind.inc unwind-dw2-fde.h unwind-dw2-fde.c
+
+SHLIBUNWIND_SOVERSION = 7
+SHLIBUNWIND_SONAME = @shlib_so_name@.so.$(SHLIBUNWIND_SOVERSION)
+SHLIBUNWIND_NAME = @shlib_dir@@shlib_so_name@.so.$(SHLIBUNWIND_SOVERSION)
+
+SHLIBUNWIND_LINK = $(GCC_FOR_TARGET) $(LIBGCC2_CFLAGS) -shared \
+	-nodefaultlibs -Wl,-h,$(SHLIBUNWIND_SONAME) \
+	-Wl,-z,text -Wl,-z,defs \
+	-o $(SHLIBUNWIND_NAME) @multilib_flags@ $(SHLIB_OBJS) -lc && \
+	rm -f $(SHLIB_SOLINK) && \
+	$(LN_S) $(SHLIBUNWIND_NAME) $(SHLIB_SOLINK)
+
+# $(slibdir) double quoted to protect it from expansion while building
+# libgcc.mk.  We want this delayed until actual install time.
+SHLIBUNWIND_INSTALL = \
+	$$(SHELL) $$(srcdir)/mkinstalldirs $$(DESTDIR)$$(slibdir)$(SHLIB_SLIBDIR_QUAL); \
+	$(INSTALL_DATA) $(SHLIBUNWIND_NAME) \
+	  $$(DESTDIR)$$(slibdir)$(SHLIB_SLIBDIR_QUAL)/$(SHLIBUNWIND_SONAME); \
+	rm -f $$(DESTDIR)$$(slibdir)$(SHLIB_SLIBDIR_QUAL)/$(SHLIB_SOLINK); \
+	$(LN_S) $(SHLIBUNWIND_SONAME) \
+	  $$(DESTDIR)$$(slibdir)$(SHLIB_SLIBDIR_QUAL)/$(SHLIB_SOLINK)
diff --git a/gcc/configure b/gcc/configure
index 28f5551ea3c..d6e2e1731da 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -309,7 +309,7 @@ ac_includes_default="\
 # include <unistd.h>
 #endif"
 
-ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS build build_cpu build_vendor build_os host host_cpu host_vendor host_os target target_cpu target_vendor target_os target_noncanonical build_subdir host_subdir target_subdir GENINSRC CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT NO_MINUS_C_MINUS_O OUTPUT_OPTION CPP strict1_warn warn_cflags WERROR nocommon_flag TREEBROWSER EGREP valgrind_path valgrind_path_defines valgrind_command coverage_flags enable_multilib enable_shared TARGET_SYSTEM_ROOT TARGET_SYSTEM_ROOT_DEFINE CROSS_SYSTEM_HEADER_DIR onestep SET_MAKE AWK LN_S LN RANLIB ac_ct_RANLIB ranlib_flags INSTALL INSTALL_PROGRAM INSTALL_DATA make_compare_target have_mktemp_command MAKEINFO BUILD_INFO GENERATED_MANPAGES FLEX BISON NM AR stage1_cflags COLLECT2_LIBS GNAT_LIBEXC LDEXP_LIB TARGET_GETGROUPS_T LIBICONV LIBICONV_DEP manext objext gthread_flags extra_modes_file PACKAGE VERSION USE_NLS LIBINTL LIBINTL_DEP INCINTL XGETTEXT GMSGFMT POSUB CATALOGS CROSS ALL SYSTEM_HEADER_DIR inhibit_libc CC_FOR_BUILD BUILD_CFLAGS STMP_FIXINC STMP_FIXPROTO collect2 libgcc_visibility GGC zlibdir zlibinc MAINT ANDER BANSHEEINC BANSHEELIB gcc_tooldir dollar slibdir objdir subdirs srcdir all_boot_languages all_compilers all_gtfiles all_gtfiles_files_langs all_gtfiles_files_files all_lang_makefrags all_lang_makefiles all_languages all_stagestuff build_exeext build_install_headers_dir build_xm_file_list build_xm_include_list build_xm_defines check_languages cc_set_by_configure quoted_cc_set_by_configure cpp_install_dir xmake_file tmake_file extra_gcc_objs extra_headers_list extra_objs extra_parts extra_passes extra_programs float_h_file gcc_config_arguments gcc_gxx_include_dir libstdcxx_incdir gcc_version gcc_version_full gcc_version_trigger host_exeext host_xm_file_list host_xm_include_list host_xm_defines out_host_hook_obj install lang_opt_files lang_specs_files lang_tree_files local_prefix md_file objc_boehm_gc out_file out_object_file stage_prefix_set_by_configure quoted_stage_prefix_set_by_configure symbolic_link thread_file tm_file_list tm_include_list tm_defines tm_p_file_list tm_p_include_list xm_file_list xm_include_list xm_defines c_target_objs cxx_target_objs target_cpu_default GMPLIBS GMPINC LIBOBJS LTLIBOBJS'
+ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS build build_cpu build_vendor build_os host host_cpu host_vendor host_os target target_cpu target_vendor target_os build_subdir host_subdir target_subdir GENINSRC CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT NO_MINUS_C_MINUS_O OUTPUT_OPTION CPP strict1_warn warn_cflags WERROR nocommon_flag TREEBROWSER EGREP valgrind_path valgrind_path_defines valgrind_command coverage_flags enable_multilib enable_shared TARGET_SYSTEM_ROOT TARGET_SYSTEM_ROOT_DEFINE CROSS_SYSTEM_HEADER_DIR onestep SET_MAKE AWK LN_S LN RANLIB ac_ct_RANLIB ranlib_flags INSTALL INSTALL_PROGRAM INSTALL_DATA make_compare_target have_mktemp_command MAKEINFO BUILD_INFO GENERATED_MANPAGES FLEX BISON NM AR stage1_cflags COLLECT2_LIBS GNAT_LIBEXC LDEXP_LIB TARGET_GETGROUPS_T LIBICONV LIBICONV_DEP manext objext gthread_flags extra_modes_file PACKAGE VERSION USE_NLS LIBINTL LIBINTL_DEP INCINTL XGETTEXT GMSGFMT POSUB CATALOGS CROSS ALL SYSTEM_HEADER_DIR inhibit_libc CC_FOR_BUILD BUILD_CFLAGS STMP_FIXINC STMP_FIXPROTO collect2 libgcc_visibility GGC zlibdir zlibinc MAINT ANDER BANSHEEINC BANSHEELIB gcc_tooldir dollar slibdir objdir subdirs srcdir all_boot_languages all_compilers all_gtfiles all_gtfiles_files_langs all_gtfiles_files_files all_lang_makefrags all_lang_makefiles all_languages all_stagestuff build_exeext build_install_headers_dir build_xm_file_list build_xm_include_list build_xm_defines check_languages cc_set_by_configure quoted_cc_set_by_configure cpp_install_dir xmake_file tmake_file extra_gcc_objs extra_headers_list extra_objs extra_parts extra_passes extra_programs float_h_file gcc_config_arguments gcc_gxx_include_dir libstdcxx_incdir gcc_version gcc_version_full gcc_version_trigger host_exeext host_xm_file_list host_xm_include_list host_xm_defines out_host_hook_obj install lang_opt_files lang_specs_files lang_tree_files local_prefix md_file objc_boehm_gc out_file out_object_file stage_prefix_set_by_configure quoted_stage_prefix_set_by_configure symbolic_link thread_file tm_file_list tm_include_list tm_defines tm_p_file_list tm_p_include_list xm_file_list xm_include_list xm_defines c_target_objs cxx_target_objs target_cpu_default GMPLIBS GMPINC LIBOBJS LTLIBOBJS'
 ac_subst_files='language_hooks'
 
 # Initialize some variables set by options.
@@ -890,7 +890,6 @@ Optional Features:
   --enable-initfini-array	use .init_array/.fini_array sections
   --enable-sjlj-exceptions
                           arrange to use setjmp/longjmp exception handling
-  --enable-libunwind-exceptions  force use libunwind for exceptions
   --disable-win32-registry
                           disable lookup of installation paths in the
                           Registry on Windows hosts
@@ -923,6 +922,7 @@ Optional Packages:
   --with-dwarf2           force the default debug format to be DWARF 2
   --with-sysroot=DIR Search for usr/lib, usr/include, et al, within DIR.
   --with-libiconv-prefix=DIR  search for libiconv in DIR/include and DIR/lib
+  --with-system-libunwind use installed libunwind
   --with-gc={page,zone}   choose the garbage collection mechanism to use
                           with the compiler
   --with-system-zlib      use installed libz
@@ -1031,7 +1031,7 @@ esac
     else
       echo "$as_me: WARNING: no configuration information is in $ac_dir" >&2
     fi
-    cd "$ac_popdir"
+    cd $ac_popdir
   done
 fi
 
@@ -1495,6 +1495,9 @@ test -n "$target_alias" &&
   program_prefix=${target_alias}-
 
 # Determine the noncanonical target name, for directory use.
+ACX_NONCANONICAL_TARGET
+
+# Determine the target- and build-specific subdirectories
  case ${build_alias} in
   "") build_noncanonical=${build} ;;
   *) build_noncanonical=${build_alias} ;;
@@ -1510,10 +1513,6 @@ esac
   *) target_noncanonical=${target_alias} ;;
 esac
 
-
-
-
-# Determine the target- and build-specific subdirectories
   # Prefix 'build-' so this never conflicts with target_subdir.
 build_subdir="build-${build_noncanonical}"
 # Not really a subdirectory, but here for completeness.
@@ -2383,7 +2382,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2441,7 +2441,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2557,7 +2558,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2611,7 +2613,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2656,7 +2659,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -2700,7 +2704,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3106,7 +3111,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3177,7 +3183,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3236,7 +3243,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3302,7 +3310,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3372,7 +3381,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3442,7 +3452,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3512,7 +3523,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3583,7 +3595,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3655,7 +3668,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3728,7 +3742,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3778,7 +3793,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -3836,7 +3852,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4071,7 +4088,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4241,7 +4259,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -4304,7 +4323,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5269,7 +5289,7 @@ if test "${gcc_cv_prog_makeinfo_modern+set}" = set; then
 else
     ac_prog_version=`$MAKEINFO --version 2>&1 |
                    sed -n 's/^.*GNU texinfo.* \([0-9][0-9.]*\).*$/\1/p'`
-  echo "configure:5272: version of makeinfo is $ac_prog_version" >&5
+  echo "configure:5292: version of makeinfo is $ac_prog_version" >&5
   case $ac_prog_version in
     '')     gcc_cv_prog_makeinfo_modern=no;;
     4.[2-9]*)
@@ -5524,7 +5544,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5594,7 +5615,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5759,7 +5781,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5820,7 +5843,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -5890,7 +5914,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6164,7 +6189,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6237,7 +6263,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6278,7 +6305,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6480,7 +6508,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6554,7 +6583,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6608,7 +6638,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6686,7 +6717,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6740,7 +6772,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6808,7 +6841,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -6938,7 +6972,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -7059,7 +7094,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -7410,7 +7446,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -7527,7 +7564,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -7639,7 +7677,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -7797,7 +7836,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8166,7 +8206,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8216,7 +8257,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8291,7 +8333,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8365,7 +8408,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8467,7 +8511,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8552,7 +8597,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8621,7 +8667,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8690,7 +8737,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8773,7 +8821,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8849,7 +8898,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -8915,7 +8965,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9051,7 +9102,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9101,88 +9153,14 @@ _ACEOF
 
 fi;
 
-if test x$host = x$target; then
-   echo "$as_me:$LINENO: checking for main in -lunwind" >&5
-echo $ECHO_N "checking for main in -lunwind... $ECHO_C" >&6
-if test "${ac_cv_lib_unwind_main+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lunwind  $LIBS"
-cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
+# For platforms with the unwind ABI which includes an unwind library,
+# libunwind, we can choose to use the system libunwind.
 
+# Check whether --with-system-libunwind or --without-system-libunwind was given.
+if test "${with_system_libunwind+set}" = set; then
+  withval="$with_system_libunwind"
 
-int
-main ()
-{
-main ();
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext conftest$ac_exeext
-if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
-  (eval $ac_link) 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; } &&
-	 { ac_try='test -s conftest$ac_exeext'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  ac_cv_lib_unwind_main=yes
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-ac_cv_lib_unwind_main=no
-fi
-rm -f conftest.err conftest.$ac_objext \
-      conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-echo "$as_me:$LINENO: result: $ac_cv_lib_unwind_main" >&5
-echo "${ECHO_T}$ac_cv_lib_unwind_main" >&6
-if test $ac_cv_lib_unwind_main = yes; then
-  use_libunwind_default=yes
-else
-  use_libunwind_default=no
-fi
-
-else
-   use_libunwind_default=no
-fi
-# Use libunwind based exception handling.
-# Check whether --enable-libunwind-exceptions or --disable-libunwind-exceptions was given.
-if test "${enable_libunwind_exceptions+set}" = set; then
-  enableval="$enable_libunwind_exceptions"
-  use_libunwind_exceptions=$enableval
-else
-  use_libunwind_exceptions=$use_libunwind_default
 fi;
-if test x"$use_libunwind_exceptions" = xyes; then
-
-cat >>confdefs.h <<\_ACEOF
-#define USE_LIBUNWIND_EXCEPTIONS 1
-_ACEOF
-
-fi
 
 # --------------------------------------------------------
 # Build, host, and target specific configuration fragments
@@ -9432,7 +9410,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9699,7 +9678,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -9753,7 +9733,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
   (eval $ac_try) 2>&5
   ac_status=$?
@@ -13182,7 +13163,6 @@ s,@target@,$target,;t t
 s,@target_cpu@,$target_cpu,;t t
 s,@target_vendor@,$target_vendor,;t t
 s,@target_os@,$target_os,;t t
-s,@target_noncanonical@,$target_noncanonical,;t t
 s,@build_subdir@,$build_subdir,;t t
 s,@host_subdir@,$host_subdir,;t t
 s,@target_subdir@,$target_subdir,;t t
@@ -13506,6 +13486,11 @@ esac
 
 
 
+  if test x"$ac_file" != x-; then
+    { echo "$as_me:$LINENO: creating $ac_file" >&5
+echo "$as_me: creating $ac_file" >&6;}
+    rm -f "$ac_file"
+  fi
   # Let's still pretend it is `configure' which instantiates (i.e., don't
   # use $as_me), people would be surprised to read:
   #    /* config.h.  Generated by config.status.  */
@@ -13544,12 +13529,6 @@ echo "$as_me: error: cannot find input file: $f" >&2;}
 	 fi;;
       esac
     done` || { (exit 1); exit 1; }
-
-  if test x"$ac_file" != x-; then
-    { echo "$as_me:$LINENO: creating $ac_file" >&5
-echo "$as_me: creating $ac_file" >&6;}
-    rm -f "$ac_file"
-  fi
 _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF
   sed "$ac_vpsub
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 328d42a8381..1da2417c608 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -1114,20 +1114,10 @@ AC_ARG_ENABLE(sjlj-exceptions,
 AC_DEFINE_UNQUOTED(CONFIG_SJLJ_EXCEPTIONS, $sjlj,
   [Define 0/1 to force the choice for exception handling model.])])
 
-if test x$host = x$target; then
-   AC_CHECK_LIB(unwind, main, use_libunwind_default=yes, use_libunwind_default=no)
-else
-   use_libunwind_default=no
-fi
-# Use libunwind based exception handling.
-AC_ARG_ENABLE(libunwind-exceptions,
-[  --enable-libunwind-exceptions  force use libunwind for exceptions],
-use_libunwind_exceptions=$enableval,
-use_libunwind_exceptions=$use_libunwind_default)
-if test x"$use_libunwind_exceptions" = xyes; then
-   AC_DEFINE(USE_LIBUNWIND_EXCEPTIONS, 1,
-	[Define if gcc should use -lunwind.])
-fi
+# For platforms with the unwind ABI which includes an unwind library,
+# libunwind, we can choose to use the system libunwind.
+AC_ARG_WITH(system-libunwind,
+[  --with-system-libunwind use installed libunwind])
 
 # --------------------------------------------------------
 # Build, host, and target specific configuration fragments
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index c9c012ba077..7a2d3e59266 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -2933,8 +2933,9 @@ have installed.
 IA-64 processor (also known as IPF, or Itanium Processor Family)
 running GNU/Linux.
 
-If you are using the optional libunwind library, then you must use
-libunwind 0.96 or later.
+If you are using the installed system libunwind library with
+@option{--with-system-libunwind}, then you must use libunwind 0.98 or
+later.
 
 None of the following versions of GCC has an ABI that is compatible
 with any of the other versions in this list, with the exception that
@@ -2956,6 +2957,8 @@ the option @option{--with-gnu-as} may be necessary.
 The GCC libunwind library has not been ported to HPUX. This means that for
 GCC versions 3.2.3 and earlier, @option{--enable-libunwind-exceptions}
 is required to build GCC. For GCC 3.3 and later, this is the default.
+For gcc 3.4.3 and later, @option{--enable-libunwind-exceptions} is
+removed and the system libunwind library will always be used.
 
 @html
 <hr />
diff --git a/gcc/gcc.c b/gcc/gcc.c
index 7685274cc5f..8076f51c912 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -1702,6 +1702,9 @@ init_spec (void)
 			    "-lgcc_s"
 #else
 			    "-lgcc_s%M"
+#endif
+#ifdef USE_LIBUNWIND_EXCEPTIONS
+			    " -lunwind"
 #endif
 			    ,
 			    "-lgcc",
diff --git a/gcc/mklibgcc.in b/gcc/mklibgcc.in
index 891e474b531..ebf0a81edb4 100644
--- a/gcc/mklibgcc.in
+++ b/gcc/mklibgcc.in
@@ -14,7 +14,13 @@
 # LIB2ADD
 # LIB2ADD_ST 
 # LIB2ADDEH
+# LIB2ADDEHSTATIC
+# LIB2ADDEHSHARED
 # LIB2ADDEHDEP
+# LIBUNWIND
+# LIBUNWINDDEP
+# SHLIBUNWIND_LINK
+# SHLIBUNWIND_INSTALL
 # FPBIT
 # FPBIT_FUNCS
 # LIB2_DIVMOD_FUNCS
@@ -117,7 +123,8 @@ done
 
 libgcc2_objs=""
 libgcc2_st_objs=""
-libgcc2_eh_objs=""
+libgcc2_eh_static_objs=""
+libgcc2_eh_shared_objs=""
 
 for name in $lib2funcs; do
   for ml in $MULTILIBS; do
@@ -236,13 +243,27 @@ for file in $LIB2ADDEH; do
     echo $out: stmp-dirs $file $LIB2ADDEHDEP $libgcc_dep
     echo "	$gcc_compile" $flags -fexceptions -c $file -o $out
   done
-  if [ "$SHLIB_LINK" ]; then
-    libgcc2_eh_objs="$libgcc2_eh_objs ${oname}${objext}"
-  else
+  if [ -z "$SHLIB_LINK" ]; then
     libgcc2_objs="$libgcc2_objs ${oname}${objext}"
   fi
 done
 
+if [ "$SHLIB_LINK" ]; then
+  # Those should be in libgcc_eh.a.
+  for file in $LIB2ADDEHSTATIC; do
+    name=`echo $file | sed -e 's/[.][cSo]$//' -e 's/[.]asm$//' -e 's/[.]txt$//'`
+    oname=`echo $name | sed -e 's,.*/,,'`
+    libgcc2_eh_static_objs="$libgcc2_eh_static_objs ${oname}${objext}"
+  done
+
+  # Those should be in libgcc.so.
+  for file in $LIB2ADDEHSHARED; do
+    name=`echo $file | sed -e 's/[.][cSo]$//' -e 's/[.]asm$//' -e 's/[.]txt$//'`
+    oname=`echo $name | sed -e 's,.*/,,'`
+    libgcc2_eh_shared_objs="$libgcc2_eh_shared_objs ${oname}${objext}"
+  done
+fi
+
 for file in $LIB2ADD_ST; do
   name=`echo $file | sed -e 's/[.][cSo]$//' -e 's/[.]asm$//' -e 's/[.]txt$//'`
   oname=`echo $name | sed -e 's,.*/,,'`
@@ -261,6 +282,31 @@ for file in $LIB2ADD_ST; do
   libgcc2_st_objs="$libgcc2_st_objs ${oname}${objext}"
 done
 
+if [ "$LIBUNWIND" ]; then
+  libunwind_static_objs=""
+  libunwind_shared_objs=""
+  for file in $LIBUNWIND; do
+    name=`echo $file | sed -e 's/[.][cSo]$//' -e 's/[.]asm$//' -e 's/[.]txt$//'`
+    oname=`echo $name | sed -e 's,.*/,,'`
+
+    for ml in $MULTILIBS; do
+      dir=`echo ${ml} | sed -e 's/;.*$//' -e 's/=/$(EQ)/g'`
+      flags=`echo ${ml} | sed -e 's/^[^;]*;//' -e 's/@/ -/g'`;
+      out="libgcc/${dir}/${oname}${objext}"
+      if [ ${name}.asm = ${file} ]; then
+	flags="$flags -xassembler-with-cpp"
+      fi
+
+      echo $out: stmp-dirs $file $LIBUNWINDDEP
+      echo "	$gcc_compile" $flags -fexceptions -c $file -o $out
+      echo ${out}s: stmp-dirs $file $LIBUNWINDDEP
+      echo "	$gcc_compile" $flags -fexceptions -DSHARED -c $file -o ${out}s
+    done
+    libunwind_static_objs="$libunwind_static_objs ${oname}${objext}"
+    libunwind_shared_objs="$libunwind_shared_objs ${oname}${objext}s"
+  done
+fi
+
 #
 # build libgcov components
 #
@@ -288,17 +334,21 @@ for ml in $MULTILIBS; do
   flags=`echo ${ml} | sed -e 's/^[^;]*;//' -e 's/@/ -/g'`;
 
   libgcc_objs=""
-  libgcc_eh_objs=""
+  libgcc_eh_static_objs=""
+  libgcc_eh_shared_objs=""
   for o in $libgcc1_objs; do
     libgcc_objs="$libgcc_objs libgcc/${dir}/$o"
   done
   for o in $libgcc2_objs; do
     libgcc_objs="$libgcc_objs libgcc/${dir}/$o"
   done
-  for o in $libgcc2_eh_objs; do
-    libgcc_eh_objs="$libgcc_eh_objs libgcc/${dir}/$o"
+  for o in $libgcc2_eh_static_objs; do
+    libgcc_eh_static_objs="$libgcc_eh_static_objs libgcc/${dir}/$o"
   done
-  libgcc_sh_objs="$libgcc_objs $libgcc_eh_objs"
+  for o in $libgcc2_eh_shared_objs; do
+    libgcc_eh_shared_objs="$libgcc_eh_shared_objs libgcc/${dir}/$o"
+  done
+  libgcc_sh_objs="$libgcc_objs $libgcc_eh_shared_objs"
   shlib_deps="$libgcc_sh_objs"
 
   libgcc_st_objs=""
@@ -310,6 +360,18 @@ for ml in $MULTILIBS; do
   for o in $libgcov_objs; do
     libgcov_a_objs="$libgcov_a_objs libgcc/${dir}/$o"
   done
+
+  if [ "$LIBUNWIND" ]; then
+    libunwind_a_objs=""
+    for o in $libunwind_static_objs; do
+      libunwind_a_objs="$libunwind_a_objs libgcc/${dir}/$o"
+    done
+    libunwind_sh_objs=""
+    for o in $libunwind_shared_objs; do
+      libunwind_sh_objs="$libunwind_sh_objs libgcc/${dir}/$o"
+    done
+    shlibunwind_deps="$libunwind_sh_objs"
+  fi
   
   if [ "$SHLIB_LINK" -a "$SHLIB_MKMAP" ]; then
     mapfile="libgcc/${dir}/libgcc.map"
@@ -375,21 +437,37 @@ EOF
   echo '	$(AR_CREATE_FOR_TARGET)' ${dir}/libgcov.a $libgcov_a_objs
   echo '	$(RANLIB_FOR_TARGET)' ${dir}/libgcov.a
 
+  if [ "$LIBUNWIND" ]; then
+    echo ""
+    echo "${dir}/libunwind.a: stmp-dirs $libunwind_a_objs"
+    echo "	-rm -rf ${dir}/libunwind.a"
+    echo '	$(AR_CREATE_FOR_TARGET)' ${dir}/libunwind.a $libunwind_a_objs
+    echo '	$(RANLIB_FOR_TARGET)' ${dir}/libunwind.a
+    echo ""
+    echo "${dir}/libgcc.a: ${dir}/libunwind.a"
+  fi
+
   if [ "$SHLIB_LINK" ]; then
 
     echo ""
-    echo "${dir}/libgcc_eh.a: stmp-dirs $libgcc_eh_objs"
+    echo "${dir}/libgcc_eh.a: stmp-dirs $libgcc_eh_static_objs"
     echo "	-rm -rf ${dir}/libgcc_eh.a"
-    echo '	$(AR_CREATE_FOR_TARGET)' ${dir}/libgcc_eh.a $libgcc_eh_objs
+    echo '	$(AR_CREATE_FOR_TARGET)' ${dir}/libgcc_eh.a $libgcc_eh_static_objs
     echo '	$(RANLIB_FOR_TARGET)' ${dir}/libgcc_eh.a
 
     if [ -z "$SHLIB_MULTILIB" ]; then
       if [ "$dir" = . ]; then
 	shlib_base_name=libgcc_s
+	shlibunwind_base_name=libunwind
       else
 	shlib_base_name=libgcc_s_`echo $dir | sed s,/,_,g`
+	shlibunwind_base_name=libunwind_`echo $dir | sed s,/,_,g`
       fi
       shlib_so_name="$shlib_base_name"
+      shlibunwind_so_name="$shlibunwind_base_name"
+      if [ "$LIBUNWIND" ]; then
+	shlib_deps="$shlib_deps ${dir}/${shlibunwind_base_name}${SHLIB_EXT}"
+      fi
       shlib_dir=
       shlib_slibdir_qual=
       if [ -n "$MULTILIB_OSDIRNAMES" ]; then
@@ -401,11 +479,13 @@ EOF
 	  os_multilib_base=`echo $os_multilib_dir | sed -n "s~/${gcc_multilib_sup}\$~~p"`
 	  if [ -z "$os_multilib_base" ]; then
 	    shlib_so_name=libgcc_s
+	    shlibunwind_so_name=libunwind
 	    if [ "$os_multilib_dir" != "." ]; then
 		shlib_slibdir_qual="/$os_multilib_dir"
 	    fi
 	  else
 	    shlib_so_name=libgcc_s_`echo $gcc_multilib_sup | sed s,/,_,g`
+	    shlibunwind_so_name=libunwind_`echo $gcc_multilib_sup | sed s,/,_,g`
 	    shlib_slibdir_qual="/$os_multilib_base"
 	  fi
 	fi
@@ -421,8 +501,21 @@ EOF
 	       -e "s%@shlib_so_name@%$shlib_so_name%g" \
 	       -e "s%@shlib_dir@%$shlib_dir%g" \
 	       -e "s%@shlib_slibdir_qual@%%g"
+      if [ "$LIBUNWIND" ]; then
+	echo ""
+	echo "${dir}/${shlibunwind_base_name}${SHLIB_EXT}: $shlibunwind_deps"
+	echo "	$SHLIBUNWIND_LINK" \
+	   | sed -e "s%@multilib_flags@%$flags%g" \
+		 -e "s%@multilib_dir@%$dir%g" \
+		 -e "s%@shlib_objs@%$libunwind_sh_objs%g" \
+		 -e "s%@shlib_base_name@%$shlibunwind_base_name%g" \
+		 -e "s%@shlib_so_name@%$shlibunwind_so_name%g" \
+		 -e "s%@shlib_dir@%$shlib_dir%g" \
+		 -e "s%@shlib_slibdir_qual@%%g"
+      fi
     elif [ "$SHLIB_MULTILIB" = "$dir" ]; then
       shlib_base_name="libgcc_s";
+      shlibunwind_base_name="libunwind";
       echo ""
       echo "${shlib_base_name}${SHLIB_EXT}: $shlib_deps"
       echo "	$SHLIB_LINK" \
@@ -434,6 +527,18 @@ EOF
 	       -e "s%@shlib_so_name@%$shlib_base_name%g" \
 	       -e "s%@shlib_dir@%%g" \
 	       -e "s%@shlib_slibdir_qual@%%g"
+      if [ "$LIBUNWIND" ]; then
+	echo ""
+	echo "${shlibunwind_base_name}${SHLIB_EXT}: $shlibunwind_deps"
+	echo "	$SHLIBUNWIND_LINK" \
+	   | sed -e "s%@multilib_flags@%$flags%g" \
+		 -e "s%@multilib_dir@%$dir%g" \
+		 -e "s%@shlib_objs@%$libgcc_sh_objs%g" \
+		 -e "s%@shlib_base_name@%$shlibunwind_base_name%g" \
+		 -e "s%@shlib_so_name@%$shlibunwind_base_name%g" \
+		 -e "s%@shlib_dir@%%g" \
+		 -e "s%@shlib_slibdir_qual@%%g"
+      fi
     fi
   fi
 done
@@ -466,6 +571,9 @@ for ml in $MULTILIBS; do
     dirs="$dirs ${dir} libgcc/${dir}"
   fi
   all="$all ${dir}/libgcc.a ${dir}/libgcov.a"
+  if [ "$LIBUNWIND" ]; then
+    all="$all ${dir}/libunwind.a"
+  fi
   if [ "$SHLIB_LINK" ]; then
     all="$all ${dir}/libgcc_eh.a"
     if [ -z "$SHLIB_MULTILIB" ]; then
@@ -475,8 +583,14 @@ for ml in $MULTILIBS; do
 	suff=_`echo $dir | sed s,/,_,g`
       fi
       all="$all ${dir}/libgcc_s${suff}${SHLIB_EXT}"
+      if [ "$LIBUNWIND" ]; then
+	all="$all ${dir}/${dir}/libunwind${suff}${SHLIB_EXT}"
+      fi
     elif [ "$SHLIB_MULTILIB" = "$dir" ]; then
       all="$all libgcc_s${SHLIB_EXT}"
+      if [ "$LIBUNWIND" ]; then
+	all="$all ${dir}/${dir}/libunwind${SHLIB_EXT}"
+      fi
     fi
   fi
 done
@@ -536,10 +650,13 @@ for ml in $MULTILIBS; do
     if [ -z "$SHLIB_MULTILIB" ]; then
       if [ "$dir" = . ]; then
 	shlib_base_name=libgcc_s
+	shlibunwind_base_name=libunwind
       else
 	shlib_base_name=libgcc_s_`echo $dir | sed s,/,_,g`
+	shlibunwind_base_name=libunwind_`echo $dir | sed s,/,_,g`
       fi
       shlib_so_name="$shlib_base_name"
+      shlibunwind_so_name="$shlibunwind_base_name"
       shlib_dir=
       shlib_slibdir_qual=
       if [ -n "$MULTILIB_OSDIRNAMES" ]; then
@@ -552,11 +669,13 @@ for ml in $MULTILIBS; do
 	os_multilib_base=`echo $os_multilib_dir | sed -n "s~/${gcc_multilib_sup}\$~~p"`
 	if [ -z "$os_multilib_base" ]; then
 	  shlib_so_name=libgcc_s
+	  shlibunwind_so_name=libunwind
 	  if [ "$os_multilib_dir" != "." ]; then
 	    shlib_slibdir_qual="/$os_multilib_dir"
 	  fi
 	else
 	  shlib_so_name=libgcc_s_`echo $gcc_multilib_sup | sed s,/,_,g`
+	  shlibunwind_so_name=libunwind_`echo $gcc_multilib_sup | sed s,/,_,g`
 	  shlib_slibdir_qual="/$os_multilib_base"
 	fi
       fi
@@ -565,6 +684,16 @@ for ml in $MULTILIBS; do
 	      -e "s%@shlib_so_name@%$shlib_so_name%g" \
 	      -e "s%@shlib_dir@%$shlib_dir%g" \
 	      -e "s%@shlib_slibdir_qual@%$shlib_slibdir_qual%g"
+      if [ "$LIBUNWIND" ]; then
+	echo "	$SHLIBUNWIND_INSTALL" \
+	   | sed -e "s%@shlib_base_name@%$shlibunwind_base_name%g" \
+		 -e "s%@shlib_so_name@%$shlibunwind_so_name%g" \
+		 -e "s%@shlib_dir@%$shlib_dir%g" \
+		 -e "s%@shlib_slibdir_qual@%$shlib_slibdir_qual%g"
+	libunwinddir='$(DESTDIR)$(slibdir)$(shlib_slibdir_qual)/$(shlib_dir)'
+	echo '	$(INSTALL_DATA)' ${dir}/libunwind.a ${libunwinddir}/
+	echo '	$(RANLIB_FOR_TARGET)' ${libunwinddir}/libunwind.a
+      fi
     elif [ "$SHLIB_MULTILIB" = "$dir" ]; then
       shlib_base_name="libgcc_s";
       echo "	$SHLIB_INSTALL" \
@@ -572,6 +701,16 @@ for ml in $MULTILIBS; do
 	      -e "s%@shlib_so_name@%$shlib_base_name%g" \
 	      -e "s%@shlib_dir@%%g" \
 	      -e "s%@shlib_slibdir_qual@%%g"
+      if [ "$LIBUNWIND" ]; then
+	echo "	$SHLIBUNWIND_INSTALL" \
+	   | sed -e "s%@shlib_base_name@%$shlibunwind_base_name%g" \
+		 -e "s%@shlib_so_name@%$shlibunwind_base_name%g" \
+		 -e "s%@shlib_dir@%%g" \
+		 -e "s%@shlib_slibdir_qual@%%g"
+	libunwinddir='$(DESTDIR)$(slibdir)'
+	echo '	$(INSTALL_DATA)' ${dir}/libunwind.a ${libunwinddir}/
+	echo '	$(RANLIB_FOR_TARGET)' ${libunwinddir}/libunwind.a
+      fi
     fi
   fi
 done
diff --git a/gcc/unwind-compat.c b/gcc/unwind-compat.c
new file mode 100644
index 00000000000..26f45ac8e57
--- /dev/null
+++ b/gcc/unwind-compat.c
@@ -0,0 +1,206 @@
+/* Backward compatibility unwind routines.
+   Copyright (C) 2004
+   Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   In addition to the permissions in the GNU General Public License, the
+   Free Software Foundation gives you unlimited permission to link the
+   compiled version of this file into combinations with other programs,
+   and to distribute those combinations without any restriction coming
+   from the use of this file.  (The General Public License restrictions
+   do apply in other respects; for example, they cover modification of
+   the file, and distribution when not linked into a combined
+   executable.)
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING.  If not, write to the Free
+   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
+
+#if defined (USE_GAS_SYMVER) && defined (USE_LIBUNWIND_EXCEPTIONS)
+#include "unwind.h"
+#include "unwind-dw2-fde.h"
+#include "unwind-compat.h"
+
+extern _Unwind_Reason_Code __libunwind_Unwind_Backtrace
+  (_Unwind_Trace_Fn, void *);
+
+_Unwind_Reason_Code
+_Unwind_Backtrace (_Unwind_Trace_Fn trace, void *trace_argument)
+{
+  return __libunwind_Unwind_Backtrace (trace, trace_argument);
+}
+symver (_Unwind_Backtrace, GCC_3.3);
+
+extern void __libunwind_Unwind_DeleteException
+  (struct _Unwind_Exception *);
+
+void
+_Unwind_DeleteException (struct _Unwind_Exception *exc)
+{
+  return __libunwind_Unwind_DeleteException (exc);
+}
+symver (_Unwind_DeleteException, GCC_3.0);
+
+extern void * __libunwind_Unwind_FindEnclosingFunction (void *);
+
+void *
+_Unwind_FindEnclosingFunction (void *pc)
+{
+  return __libunwind_Unwind_FindEnclosingFunction (pc);
+}
+symver (_Unwind_FindEnclosingFunction, GCC_3.3);
+
+extern _Unwind_Reason_Code __libunwind_Unwind_ForcedUnwind
+  (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
+
+_Unwind_Reason_Code
+_Unwind_ForcedUnwind (struct _Unwind_Exception *exc,
+		      _Unwind_Stop_Fn stop, void * stop_argument)
+{
+  return __libunwind_Unwind_ForcedUnwind (exc, stop, stop_argument);
+}
+symver (_Unwind_ForcedUnwind, GCC_3.0);
+
+extern _Unwind_Word __libunwind_Unwind_GetCFA
+  (struct _Unwind_Context *);
+
+_Unwind_Word
+_Unwind_GetCFA (struct _Unwind_Context *context)
+{
+  return __libunwind_Unwind_GetCFA (context);
+}
+symver (_Unwind_GetCFA, GCC_3.3);
+
+#ifdef __ia64__
+extern _Unwind_Word __libunwind_Unwind_GetBSP
+  (struct _Unwind_Context *);
+
+_Unwind_Word
+_Unwind_GetBSP (struct _Unwind_Context * context)
+{
+  return __libunwind_Unwind_GetBSP (context);
+}
+symver (_Unwind_GetBSP, GCC_3.3.2);
+#else
+extern _Unwind_Ptr __libunwind_Unwind_GetDataRelBase
+  (struct _Unwind_Context *);
+
+_Unwind_Ptr
+_Unwind_GetDataRelBase (struct _Unwind_Context *context)
+{
+  return __libunwind_Unwind_GetDataRelBase (context);
+}
+symver (_Unwind_GetDataRelBase, GCC_3.0);
+
+extern _Unwind_Ptr __libunwind_Unwind_GetTextRelBase
+  (struct _Unwind_Context *);
+
+_Unwind_Ptr
+_Unwind_GetTextRelBase (struct _Unwind_Context *context)
+{
+  return __libunwind_Unwind_GetTextRelBase (context);
+}
+symver (_Unwind_GetTextRelBase, GCC_3.0);
+#endif
+
+extern _Unwind_Word __libunwind_Unwind_GetGR
+  (struct _Unwind_Context *, int );
+
+_Unwind_Word
+_Unwind_GetGR (struct _Unwind_Context *context, int index)
+{
+  return __libunwind_Unwind_GetGR (context, index);
+}
+symver (_Unwind_GetGR, GCC_3.0);
+
+extern _Unwind_Ptr __libunwind_Unwind_GetIP (struct _Unwind_Context *);
+
+_Unwind_Ptr
+_Unwind_GetIP (struct _Unwind_Context *context)
+{
+  return __libunwind_Unwind_GetIP (context);
+}
+symver (_Unwind_GetIP, GCC_3.0);
+
+extern void *__libunwind_Unwind_GetLanguageSpecificData
+  (struct _Unwind_Context *);
+
+void *
+_Unwind_GetLanguageSpecificData (struct _Unwind_Context *context)
+{
+  return __libunwind_Unwind_GetLanguageSpecificData (context);
+}
+symver (_Unwind_GetLanguageSpecificData, GCC_3.0);
+
+extern _Unwind_Ptr __libunwind_Unwind_GetRegionStart
+  (struct _Unwind_Context *);
+
+_Unwind_Ptr
+_Unwind_GetRegionStart (struct _Unwind_Context *context)
+{
+  return __libunwind_Unwind_GetRegionStart (context);
+}
+symver (_Unwind_GetRegionStart, GCC_3.0);
+
+extern _Unwind_Reason_Code __libunwind_Unwind_RaiseException
+  (struct _Unwind_Exception *);
+
+_Unwind_Reason_Code
+_Unwind_RaiseException(struct _Unwind_Exception *exc)
+{
+  return __libunwind_Unwind_RaiseException (exc);
+}
+symver (_Unwind_RaiseException, GCC_3.0);
+
+extern void __libunwind_Unwind_Resume (struct _Unwind_Exception *);
+
+void
+_Unwind_Resume (struct _Unwind_Exception *exc)
+{
+  __libunwind_Unwind_Resume (exc);
+}
+symver (_Unwind_Resume, GCC_3.0);
+
+extern _Unwind_Reason_Code __libunwind_Unwind_Resume_or_Rethrow
+   (struct _Unwind_Exception *);
+
+_Unwind_Reason_Code
+_Unwind_Resume_or_Rethrow (struct _Unwind_Exception *exc)
+{
+  return __libunwind_Unwind_Resume_or_Rethrow (exc);
+}
+symver (_Unwind_Resume_or_Rethrow, GCC_3.3);
+
+extern void __libunwind_Unwind_SetGR
+  (struct _Unwind_Context *, int, _Unwind_Word);
+
+void
+_Unwind_SetGR (struct _Unwind_Context *context, int index,
+	       _Unwind_Word val) 
+{
+  __libunwind_Unwind_SetGR (context, index, val);
+}
+symver (_Unwind_SetGR, GCC_3.0);
+
+extern void __libunwind_Unwind_SetIP
+  (struct _Unwind_Context *, _Unwind_Ptr);
+
+void
+_Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val)
+{
+  return __libunwind_Unwind_SetIP (context, val);
+}
+symver (_Unwind_SetIP, GCC_3.0);
+#endif
diff --git a/gcc/unwind-compat.h b/gcc/unwind-compat.h
new file mode 100644
index 00000000000..051cea1d05d
--- /dev/null
+++ b/gcc/unwind-compat.h
@@ -0,0 +1,35 @@
+/* Backward compatibility unwind routines.
+   Copyright (C) 2004
+   Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   In addition to the permissions in the GNU General Public License, the
+   Free Software Foundation gives you unlimited permission to link the
+   compiled version of this file into combinations with other programs,
+   and to distribute those combinations without any restriction coming
+   from the use of this file.  (The General Public License restrictions
+   do apply in other respects; for example, they cover modification of
+   the file, and distribution when not linked into a combined
+   executable.)
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING.  If not, write to the Free
+   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
+
+#define symver(name, version) \
+  __asm__ (".symver " #name"," #name "@" #version)
+
+#define alias(name) \
+  __typeof(name) __libunwind##name __attribute__ ((alias (#name)))
diff --git a/gcc/unwind-dw2-fde-compat.c b/gcc/unwind-dw2-fde-compat.c
new file mode 100644
index 00000000000..5e8c0a30c65
--- /dev/null
+++ b/gcc/unwind-dw2-fde-compat.c
@@ -0,0 +1,46 @@
+/* Backward compatibility unwind routines.
+   Copyright (C) 2004
+   Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   In addition to the permissions in the GNU General Public License, the
+   Free Software Foundation gives you unlimited permission to link the
+   compiled version of this file into combinations with other programs,
+   and to distribute those combinations without any restriction coming
+   from the use of this file.  (The General Public License restrictions
+   do apply in other respects; for example, they cover modification of
+   the file, and distribution when not linked into a combined
+   executable.)
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING.  If not, write to the Free
+   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
+
+#if defined (USE_GAS_SYMVER) && defined (USE_LIBUNWIND_EXCEPTIONS)
+#include "unwind.h"
+#include "unwind-dw2-fde.h"
+#include "unwind-compat.h"
+
+extern const fde * __libunwind__Unwind_Find_FDE
+  (void *, struct dwarf_eh_bases *);
+
+const fde *
+_Unwind_Find_FDE (void *pc, struct dwarf_eh_bases *bases)
+{
+  __libunwind__Unwind_Find_FDE (pc, bases);
+}
+
+symver (_Unwind_Find_FDE, GCC_3.0);
+#endif
diff --git a/gcc/unwind-dw2-fde-glibc.c b/gcc/unwind-dw2-fde-glibc.c
index 1d2930df668..96d7946291a 100644
--- a/gcc/unwind-dw2-fde-glibc.c
+++ b/gcc/unwind-dw2-fde-glibc.c
@@ -46,6 +46,7 @@
 #define NO_BASE_OF_ENCODED_VALUE
 #include "unwind-pe.h"
 #include "unwind-dw2-fde.h"
+#include "unwind-compat.h"
 #include "gthr.h"
 
 #if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
@@ -306,3 +307,7 @@ _Unwind_Find_FDE (void *pc, struct dwarf_eh_bases *bases)
 #define _Unwind_Find_FDE _Unwind_Find_FDE
 #include "unwind-dw2-fde.c"
 #endif
+
+#if defined (USE_GAS_SYMVER) && defined (SHARED) && defined (USE_LIBUNWIND_EXCEPTIONS)
+alias (_Unwind_Find_FDE);
+#endif
diff --git a/gcc/unwind-dw2.c b/gcc/unwind-dw2.c
index 3815d9f3f95..db8f3f5e20a 100644
--- a/gcc/unwind-dw2.c
+++ b/gcc/unwind-dw2.c
@@ -1317,4 +1317,24 @@ uw_identify_context (struct _Unwind_Context *context)
 
 #include "unwind.inc"
 
+#if defined (USE_GAS_SYMVER) && defined (SHARED) && defined (USE_LIBUNWIND_EXCEPTIONS)
+alias (_Unwind_Backtrace);
+alias (_Unwind_DeleteException);
+alias (_Unwind_FindEnclosingFunction);
+alias (_Unwind_FindTableEntry);
+alias (_Unwind_ForcedUnwind);
+alias (_Unwind_GetDataRelBase);
+alias (_Unwind_GetTextRelBase);
+alias (_Unwind_GetCFA);
+alias (_Unwind_GetGR);
+alias (_Unwind_GetIP);
+alias (_Unwind_GetLanguageSpecificData);
+alias (_Unwind_GetRegionStart);
+alias (_Unwind_RaiseException);
+alias (_Unwind_Resume);
+alias (_Unwind_Resume_or_Rethrow);
+alias (_Unwind_SetGR);
+alias (_Unwind_SetIP);
+#endif
+
 #endif /* !USING_SJLJ_EXCEPTIONS */