From: Nathanael Nerode <neroden@gcc.gnu.org>
Date: Tue, 16 Mar 2004 00:04:59 +0000 (+0000)
Subject: 2004-03-15  Nathanael Nerode  <neroden@gcc.gnu.org>
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=1d39f3299631af4b58eb450f2a3d702fdda2c803;p=binutils-gdb.git

2004-03-15  Nathanael Nerode  <neroden@gcc.gnu.org>

	* Makefile.tpl: Introduce experimental top level bootstrap support.
	* Makefile.in: Regenerate.
	* configure.in: Introduce support for top level bootstrap.
	* configure: Regenerate.
---

diff --git a/ChangeLog b/ChangeLog
index b8d3dc1fd84..23d65376851 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2004-03-15  Nathanael Nerode  <neroden@gcc.gnu.org>
+
+	* Makefile.tpl: Introduce experimental top level bootstrap support.
+	* Makefile.in: Regenerate.
+	* configure.in: Introduce support for top level bootstrap.
+	* configure: Regenerate.
+
 2004-03-12  Eric Botcazou  <ebotcazou@gcc.gnu.org>
             Paolo Bonzini  <bonzini@gnu.org>
 
diff --git a/Makefile.in b/Makefile.in
index 91c19d9ea4b..d65d350ab11 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -23555,10 +23555,13 @@ install-target-libada: installdirs
 # Don't use shared host config.cache, as it will confuse later
 # directories; GCC wants slightly different values for some
 # precious variables.  *sigh*
+
+# We must skip configuring if toplevel bootstrap is going.
 .PHONY: configure-gcc maybe-configure-gcc
 maybe-configure-gcc:
 configure-gcc:
 	@test ! -f gcc/Makefile || exit 0; \
+	[ -f stage_last ] && exit 0; \
 	[ -d gcc ] || mkdir gcc; \
 	r=`${PWD_COMMAND}`; export r; \
 	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
@@ -23601,14 +23604,14 @@ configure-gcc:
 .PHONY: all-gcc maybe-all-gcc
 maybe-all-gcc:
 all-gcc: configure-gcc
-	@if [ -f gcc/stage_last ] ; then \
-	  r=`${PWD_COMMAND}`; export r; \
-	  s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	if [ -f stage_last ] ; then \
+	  true ; \
+	elif [ -f gcc/stage_last ] ; then \
 	  $(SET_LIB_PATH) \
 	  (cd gcc && $(MAKE) $(GCC_FLAGS_TO_PASS) quickstrap); \
 	else \
-	  r=`${PWD_COMMAND}`; export r; \
-	  s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
 	  $(SET_LIB_PATH) \
 	  (cd gcc && $(MAKE) $(GCC_FLAGS_TO_PASS) all); \
 	fi
@@ -23746,6 +23749,270 @@ gcc-no-fixedincludes:
 	  mv gcc/tmp-include gcc/include 2>/dev/null; \
 	else true; fi
 
+# ---------------------
+# GCC bootstrap support
+# ---------------------
+
+# We name the directories for the various stages "stage1-gcc",
+# "stage2-gcc","stage3-gcc", etc.  
+# Unfortunately, the 'compare' process will fail (on debugging information)
+# if any directory names are different!
+# So in the building rule for each stage, we relocate them before and after.
+# The current one is 'gcc', while the previous one is 'prev-gcc'.  (The
+# current one must be 'gcc' for now because the scripts in that directory
+# assume it.)
+# At the end of the bootstrap, 'stage3-gcc' must be moved to 'gcc' so that
+# libraries can find it.  Ick!
+
+# Bugs: This is almost certainly not parallel-make safe.
+
+# 'touch' doesn't work right on some platforms.
+STAMP = echo timestamp > 
+
+# Only build the C compiler for stage1, because that is the only one that
+# we can guarantee will build with the native compiler, and also it is the
+# only thing useful for building stage2. STAGE1_CFLAGS (via CFLAGS),
+# MAKEINFO and MAKEINFOFLAGS are explicitly passed here to make them
+# overrideable (for a bootstrap build stage1 also builds gcc.info).
+
+STAGE1_CFLAGS=@stage1_cflags@
+STAGE1_LANGUAGES=@stage1_languages@
+
+configure-stage1-gcc:
+	echo configure-stage1-gcc > stage_last ; \
+	if [ -f stage1-gcc/Makefile ] ; then \
+	  $(STAMP) configure-stage1-gcc ; \
+	  exit 0; \
+	else \
+	  true ; \
+	fi ; \
+	[ -d stage1-gcc ] || mkdir stage1-gcc; \
+	mv stage1-gcc gcc ; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	CC="$(CC)"; export CC; \
+	CFLAGS="$(CFLAGS)"; export CFLAGS; \
+	CXX="$(CXX)"; export CXX; \
+	CXXFLAGS="$(CXXFLAGS)"; export CXXFLAGS; \
+	TOPLEVEL_CONFIGURE_ARGUMENTS="$(TOPLEVEL_CONFIGURE_ARGUMENTS)"; export TOPLEVEL_CONFIGURE_ARGUMENTS; \
+	AR="$(AR)"; export AR; \
+	AS="$(AS)"; export AS; \
+	CC_FOR_BUILD="$(CC_FOR_BUILD)"; export CC_FOR_BUILD; \
+	DLLTOOL="$(DLLTOOL)"; export DLLTOOL; \
+	LD="$(LD)"; export LD; \
+	NM="$(NM)"; export NM; \
+	RANLIB="$(RANLIB)"; export RANLIB; \
+	WINDRES="$(WINDRES)"; export WINDRES; \
+	OBJCOPY="$(OBJCOPY)"; export OBJCOPY; \
+	OBJDUMP="$(OBJDUMP)"; export OBJDUMP; \
+	echo Configuring stage 1 in gcc; \
+	cd gcc || exit 1; \
+	case $(srcdir) in \
+	  \.) \
+	    srcdiroption="--srcdir=."; \
+	    libsrcdir=".";; \
+	  /* | [A-Za-z]:[\\/]*) \
+	    srcdiroption="--srcdir=$(srcdir)/gcc"; \
+	    libsrcdir="$$s/gcc";; \
+	  *) \
+	    srcdiroption="--srcdir=../$(srcdir)/gcc"; \
+	    libsrcdir="$$s/gcc";; \
+	esac; \
+	$(SHELL) $${libsrcdir}/configure \
+	  $(HOST_CONFIGARGS) $${srcdiroption} ; \
+	cd .. ; \
+	mv gcc stage1-gcc ; \
+	$(STAMP) configure-stage1-gcc
+
+all-stage1-gcc: configure-stage1-gcc all-bootstrap
+	echo all-stage1-gcc > stage_last ; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	mv stage1-gcc gcc ; \
+	cd gcc && \
+	$(MAKE) $(GCC_FLAGS_TO_PASS) \
+                LANGUAGES="$(STAGE1_LANGUAGES)" \
+		CFLAGS="$(STAGE1_CFLAGS)" \
+		COVERAGE_FLAGS= || exit 1 ; \
+	cd .. ; \
+	mv gcc stage1-gcc ; \
+	$(STAMP) all-stage1-gcc
+
+configure-stage2-gcc: all-stage1-gcc
+	echo configure-stage2-gcc > stage_last ; \
+	if [ -f stage2-gcc/Makefile ] ; then \
+	  $(STAMP) configure-stage2-gcc ; \
+	  exit 0; \
+	else \
+	  true ; \
+	fi ; \
+	[ -d stage2-gcc ] || mkdir stage2-gcc; \
+	mv stage2-gcc gcc ; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	CC="$(CC)"; export CC; \
+	CFLAGS="$(CFLAGS)"; export CFLAGS; \
+	CXX="$(CXX)"; export CXX; \
+	CXXFLAGS="$(CXXFLAGS)"; export CXXFLAGS; \
+	TOPLEVEL_CONFIGURE_ARGUMENTS="$(TOPLEVEL_CONFIGURE_ARGUMENTS)"; export TOPLEVEL_CONFIGURE_ARGUMENTS; \
+	AR="$(AR)"; export AR; \
+	AS="$(AS)"; export AS; \
+	CC_FOR_BUILD="$(CC_FOR_BUILD)"; export CC_FOR_BUILD; \
+	DLLTOOL="$(DLLTOOL)"; export DLLTOOL; \
+	LD="$(LD)"; export LD; \
+	NM="$(NM)"; export NM; \
+	RANLIB="$(RANLIB)"; export RANLIB; \
+	WINDRES="$(WINDRES)"; export WINDRES; \
+	OBJCOPY="$(OBJCOPY)"; export OBJCOPY; \
+	OBJDUMP="$(OBJDUMP)"; export OBJDUMP; \
+	echo Configuring stage 2 in gcc; \
+	cd gcc || exit 1; \
+	case $(srcdir) in \
+	  \.) \
+	    srcdiroption="--srcdir=."; \
+	    libsrcdir=".";; \
+	  /* | [A-Za-z]:[\\/]*) \
+	    srcdiroption="--srcdir=$(srcdir)/gcc"; \
+	    libsrcdir="$$s/gcc";; \
+	  *) \
+	    srcdiroption="--srcdir=../$(srcdir)/gcc"; \
+	    libsrcdir="$$s/gcc";; \
+	esac; \
+	$(SHELL) $${libsrcdir}/configure \
+	  $(HOST_CONFIGARGS) $${srcdiroption} ; \
+	cd .. ; \
+	mv gcc stage2-gcc ; \
+	$(STAMP) configure-stage2-gcc
+
+# Flags to pass to stage2 and later makes.
+BOOT_CFLAGS= -g -O2
+POSTSTAGE1_FLAGS_TO_PASS = \
+	CFLAGS="$(BOOT_CFLAGS)" \
+	ADAC="\$$(CC)" \
+	WARN_CFLAGS="\$$(GCC_WARN_CFLAGS)" \
+	STRICT_WARN="\$$(STRICT2_WARN)" \
+	OUTPUT_OPTION="-o \$$@"
+
+all-stage2-gcc: all-stage1-gcc configure-stage2-gcc
+	echo all-stage2-gcc > stage_last ; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	mv stage2-gcc gcc ; \
+	mv stage1-gcc prev-gcc ; \
+	cd gcc && \
+	$(MAKE) $(GCC_FLAGS_TO_PASS) \
+		CC="$(STAGE_CC_WRAPPER) $$r/prev-gcc/xgcc$(exeext) -B$$r/prev-gcc/ -B$(build_tooldir)/bin/" \
+		BUILD_CC="$(STAGE_CC_WRAPPER) $$r/prev-gcc/xgcc$(exeext) -B$$r/prev-gcc/ -B$(build_tooldir)/bin/" \
+		CC_FOR_BUILD="$(STAGE_CC_WRAPPER) $$r/prev-gcc/xgcc$(exeext) -B$$r/prev-gcc/ -B$(build_tooldir)/bin/" \
+		STAGE_PREFIX=$$r/prev-gcc/ \
+		$(POSTSTAGE1_FLAGS_TO_PASS) || exit 1 ; \
+	cd .. ; \
+	mv prev-gcc stage1-gcc ; \
+	mv gcc stage2-gcc ; \
+	$(STAMP) all-stage2-gcc
+
+configure-stage3-gcc: all-stage2-gcc
+	echo configure-stage3-gcc > stage_last ; \
+	if [ -f stage3-gcc/Makefile ] ; then \
+	  $(STAMP) configure-stage3-gcc ; \
+	  exit 0; \
+	else \
+	  true ; \
+	fi ; \
+	[ -d stage3-gcc ] || mkdir stage3-gcc; \
+	mv stage3-gcc gcc ; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	CC="$(CC)"; export CC; \
+	CFLAGS="$(CFLAGS)"; export CFLAGS; \
+	CXX="$(CXX)"; export CXX; \
+	CXXFLAGS="$(CXXFLAGS)"; export CXXFLAGS; \
+	TOPLEVEL_CONFIGURE_ARGUMENTS="$(TOPLEVEL_CONFIGURE_ARGUMENTS)"; export TOPLEVEL_CONFIGURE_ARGUMENTS; \
+	AR="$(AR)"; export AR; \
+	AS="$(AS)"; export AS; \
+	CC_FOR_BUILD="$(CC_FOR_BUILD)"; export CC_FOR_BUILD; \
+	DLLTOOL="$(DLLTOOL)"; export DLLTOOL; \
+	LD="$(LD)"; export LD; \
+	NM="$(NM)"; export NM; \
+	RANLIB="$(RANLIB)"; export RANLIB; \
+	WINDRES="$(WINDRES)"; export WINDRES; \
+	OBJCOPY="$(OBJCOPY)"; export OBJCOPY; \
+	OBJDUMP="$(OBJDUMP)"; export OBJDUMP; \
+	echo Configuring stage 3 in gcc; \
+	cd gcc || exit 1; \
+	case $(srcdir) in \
+	  \.) \
+	    srcdiroption="--srcdir=."; \
+	    libsrcdir=".";; \
+	  /* | [A-Za-z]:[\\/]*) \
+	    srcdiroption="--srcdir=$(srcdir)/gcc"; \
+	    libsrcdir="$$s/gcc";; \
+	  *) \
+	    srcdiroption="--srcdir=../$(srcdir)/gcc"; \
+	    libsrcdir="$$s/gcc";; \
+	esac; \
+	$(SHELL) $${libsrcdir}/configure \
+	  $(HOST_CONFIGARGS) $${srcdiroption} ; \
+	cd .. ; \
+	mv gcc stage3-gcc ; \
+	$(STAMP) configure-stage3-gcc
+
+# Some files might not exist.  This is disabled 'cause it don't work.
+# cp prev-gcc/objc/objc-parse.c gcc/objc/objc-parse.c || true ; \
+# cp prev-gcc/java/parse.c gcc/java/parse.c || true ; \
+# cp prev-gcc/java/parse-scan.c gcc/java/parse-scan.c || true ; \
+
+all-stage3-gcc: all-stage2-gcc configure-stage3-gcc
+	echo all-stage3-gcc > stage_last ; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	mv stage2-gcc prev-gcc ; \
+	mv stage3-gcc gcc ; \
+	cd gcc && \
+	$(MAKE) $(GCC_FLAGS_TO_PASS) \
+		CC="$(STAGE_CC_WRAPPER) $$r/prev-gcc/xgcc$(exeext) -B$$r/prev-gcc/ -B$(build_tooldir)/bin/" \
+		BUILD_CC="$(STAGE_CC_WRAPPER) $$r/prev-gcc/xgcc$(exeext) -B$$r/prev-gcc/ -B$(build_tooldir)/bin/" \
+		CC_FOR_BUILD="$(STAGE_CC_WRAPPER) $$r/prev-gcc/xgcc$(exeext) -B$$r/prev-gcc/ -B$(build_tooldir)/bin/" \
+		STAGE_PREFIX=$$r/prev-gcc/ \
+		$(POSTSTAGE1_FLAGS_TO_PASS) || exit 1 ; \
+	cd .. ; \
+	mv prev-gcc stage2-gcc ; \
+	mv gcc stage3-gcc ; \
+	$(STAMP) all-stage3-gcc
+
+# We only want to compare .o files, so set this!
+objext = .o
+
+compare: all-stage3-gcc
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	rm -f .bad_compare ; \
+	cd stage3-gcc; \
+	files=`find . -name "*$(objext)" -print` ; \
+	cd .. ; \
+	for file in $${files} ; do \
+	  cmp --ignore-initial=16 $$r/stage2-gcc/$$file $$r/stage3-gcc/$$file \
+	      > /dev/null 2>&1; \
+	  test $$? -eq 1 && echo $$file differs >> .bad_compare || true; \
+	done ; \
+	if [ -f .bad_compare ]; then \
+	  echo "Bootstrap comparison failure!"; \
+	  cat .bad_compare; \
+	  exit 1; \
+	else \
+	  true; \
+	fi ; \
+        $(STAMP) compare
+
+.PHONY: new-bootstrap
+# This target exists so that everything can be made in one pass.
+# 'all-gcc' has to avoid stomping on the bootstrap-generated gcc for
+# this to work.
+new-bootstrap: compare
+	mv stage3-gcc gcc ; \
+	$(MAKE) all ; \
+	mv gcc stage3-gcc
+
 # --------------------------------------
 # Dependencies between different modules
 # --------------------------------------
diff --git a/Makefile.tpl b/Makefile.tpl
index 6a30f45941b..b565b03079d 100644
--- a/Makefile.tpl
+++ b/Makefile.tpl
@@ -1072,10 +1072,13 @@ install-target-[+module+]: installdirs
 # Don't use shared host config.cache, as it will confuse later
 # directories; GCC wants slightly different values for some
 # precious variables.  *sigh*
+
+# We must skip configuring if toplevel bootstrap is going.
 .PHONY: configure-gcc maybe-configure-gcc
 maybe-configure-gcc:
 configure-gcc:
 	@test ! -f gcc/Makefile || exit 0; \
+	[ -f stage_last ] && exit 0; \
 	[ -d gcc ] || mkdir gcc; \
 	r=`${PWD_COMMAND}`; export r; \
 	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
@@ -1118,14 +1121,14 @@ configure-gcc:
 .PHONY: all-gcc maybe-all-gcc
 maybe-all-gcc:
 all-gcc: configure-gcc
-	@if [ -f gcc/stage_last ] ; then \
-	  r=`${PWD_COMMAND}`; export r; \
-	  s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	if [ -f stage_last ] ; then \
+	  true ; \
+	elif [ -f gcc/stage_last ] ; then \
 	  $(SET_LIB_PATH) \
 	  (cd gcc && $(MAKE) $(GCC_FLAGS_TO_PASS) quickstrap); \
 	else \
-	  r=`${PWD_COMMAND}`; export r; \
-	  s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
 	  $(SET_LIB_PATH) \
 	  (cd gcc && $(MAKE) $(GCC_FLAGS_TO_PASS) all); \
 	fi
@@ -1263,6 +1266,270 @@ gcc-no-fixedincludes:
 	  mv gcc/tmp-include gcc/include 2>/dev/null; \
 	else true; fi
 
+# ---------------------
+# GCC bootstrap support
+# ---------------------
+
+# We name the directories for the various stages "stage1-gcc",
+# "stage2-gcc","stage3-gcc", etc.  
+# Unfortunately, the 'compare' process will fail (on debugging information)
+# if any directory names are different!
+# So in the building rule for each stage, we relocate them before and after.
+# The current one is 'gcc', while the previous one is 'prev-gcc'.  (The
+# current one must be 'gcc' for now because the scripts in that directory
+# assume it.)
+# At the end of the bootstrap, 'stage3-gcc' must be moved to 'gcc' so that
+# libraries can find it.  Ick!
+
+# Bugs: This is almost certainly not parallel-make safe.
+
+# 'touch' doesn't work right on some platforms.
+STAMP = echo timestamp > 
+
+# Only build the C compiler for stage1, because that is the only one that
+# we can guarantee will build with the native compiler, and also it is the
+# only thing useful for building stage2. STAGE1_CFLAGS (via CFLAGS),
+# MAKEINFO and MAKEINFOFLAGS are explicitly passed here to make them
+# overrideable (for a bootstrap build stage1 also builds gcc.info).
+
+STAGE1_CFLAGS=@stage1_cflags@
+STAGE1_LANGUAGES=@stage1_languages@
+
+configure-stage1-gcc:
+	echo configure-stage1-gcc > stage_last ; \
+	if [ -f stage1-gcc/Makefile ] ; then \
+	  $(STAMP) configure-stage1-gcc ; \
+	  exit 0; \
+	else \
+	  true ; \
+	fi ; \
+	[ -d stage1-gcc ] || mkdir stage1-gcc; \
+	mv stage1-gcc gcc ; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	CC="$(CC)"; export CC; \
+	CFLAGS="$(CFLAGS)"; export CFLAGS; \
+	CXX="$(CXX)"; export CXX; \
+	CXXFLAGS="$(CXXFLAGS)"; export CXXFLAGS; \
+	TOPLEVEL_CONFIGURE_ARGUMENTS="$(TOPLEVEL_CONFIGURE_ARGUMENTS)"; export TOPLEVEL_CONFIGURE_ARGUMENTS; \
+	AR="$(AR)"; export AR; \
+	AS="$(AS)"; export AS; \
+	CC_FOR_BUILD="$(CC_FOR_BUILD)"; export CC_FOR_BUILD; \
+	DLLTOOL="$(DLLTOOL)"; export DLLTOOL; \
+	LD="$(LD)"; export LD; \
+	NM="$(NM)"; export NM; \
+	RANLIB="$(RANLIB)"; export RANLIB; \
+	WINDRES="$(WINDRES)"; export WINDRES; \
+	OBJCOPY="$(OBJCOPY)"; export OBJCOPY; \
+	OBJDUMP="$(OBJDUMP)"; export OBJDUMP; \
+	echo Configuring stage 1 in gcc; \
+	cd gcc || exit 1; \
+	case $(srcdir) in \
+	  \.) \
+	    srcdiroption="--srcdir=."; \
+	    libsrcdir=".";; \
+	  /* | [A-Za-z]:[\\/]*) \
+	    srcdiroption="--srcdir=$(srcdir)/gcc"; \
+	    libsrcdir="$$s/gcc";; \
+	  *) \
+	    srcdiroption="--srcdir=../$(srcdir)/gcc"; \
+	    libsrcdir="$$s/gcc";; \
+	esac; \
+	$(SHELL) $${libsrcdir}/configure \
+	  $(HOST_CONFIGARGS) $${srcdiroption} ; \
+	cd .. ; \
+	mv gcc stage1-gcc ; \
+	$(STAMP) configure-stage1-gcc
+
+all-stage1-gcc: configure-stage1-gcc all-bootstrap
+	echo all-stage1-gcc > stage_last ; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	mv stage1-gcc gcc ; \
+	cd gcc && \
+	$(MAKE) $(GCC_FLAGS_TO_PASS) \
+                LANGUAGES="$(STAGE1_LANGUAGES)" \
+		CFLAGS="$(STAGE1_CFLAGS)" \
+		COVERAGE_FLAGS= || exit 1 ; \
+	cd .. ; \
+	mv gcc stage1-gcc ; \
+	$(STAMP) all-stage1-gcc
+
+configure-stage2-gcc: all-stage1-gcc
+	echo configure-stage2-gcc > stage_last ; \
+	if [ -f stage2-gcc/Makefile ] ; then \
+	  $(STAMP) configure-stage2-gcc ; \
+	  exit 0; \
+	else \
+	  true ; \
+	fi ; \
+	[ -d stage2-gcc ] || mkdir stage2-gcc; \
+	mv stage2-gcc gcc ; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	CC="$(CC)"; export CC; \
+	CFLAGS="$(CFLAGS)"; export CFLAGS; \
+	CXX="$(CXX)"; export CXX; \
+	CXXFLAGS="$(CXXFLAGS)"; export CXXFLAGS; \
+	TOPLEVEL_CONFIGURE_ARGUMENTS="$(TOPLEVEL_CONFIGURE_ARGUMENTS)"; export TOPLEVEL_CONFIGURE_ARGUMENTS; \
+	AR="$(AR)"; export AR; \
+	AS="$(AS)"; export AS; \
+	CC_FOR_BUILD="$(CC_FOR_BUILD)"; export CC_FOR_BUILD; \
+	DLLTOOL="$(DLLTOOL)"; export DLLTOOL; \
+	LD="$(LD)"; export LD; \
+	NM="$(NM)"; export NM; \
+	RANLIB="$(RANLIB)"; export RANLIB; \
+	WINDRES="$(WINDRES)"; export WINDRES; \
+	OBJCOPY="$(OBJCOPY)"; export OBJCOPY; \
+	OBJDUMP="$(OBJDUMP)"; export OBJDUMP; \
+	echo Configuring stage 2 in gcc; \
+	cd gcc || exit 1; \
+	case $(srcdir) in \
+	  \.) \
+	    srcdiroption="--srcdir=."; \
+	    libsrcdir=".";; \
+	  /* | [A-Za-z]:[\\/]*) \
+	    srcdiroption="--srcdir=$(srcdir)/gcc"; \
+	    libsrcdir="$$s/gcc";; \
+	  *) \
+	    srcdiroption="--srcdir=../$(srcdir)/gcc"; \
+	    libsrcdir="$$s/gcc";; \
+	esac; \
+	$(SHELL) $${libsrcdir}/configure \
+	  $(HOST_CONFIGARGS) $${srcdiroption} ; \
+	cd .. ; \
+	mv gcc stage2-gcc ; \
+	$(STAMP) configure-stage2-gcc
+
+# Flags to pass to stage2 and later makes.
+BOOT_CFLAGS= -g -O2
+POSTSTAGE1_FLAGS_TO_PASS = \
+	CFLAGS="$(BOOT_CFLAGS)" \
+	ADAC="\$$(CC)" \
+	WARN_CFLAGS="\$$(GCC_WARN_CFLAGS)" \
+	STRICT_WARN="\$$(STRICT2_WARN)" \
+	OUTPUT_OPTION="-o \$$@"
+
+all-stage2-gcc: all-stage1-gcc configure-stage2-gcc
+	echo all-stage2-gcc > stage_last ; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	mv stage2-gcc gcc ; \
+	mv stage1-gcc prev-gcc ; \
+	cd gcc && \
+	$(MAKE) $(GCC_FLAGS_TO_PASS) \
+		CC="$(STAGE_CC_WRAPPER) $$r/prev-gcc/xgcc$(exeext) -B$$r/prev-gcc/ -B$(build_tooldir)/bin/" \
+		BUILD_CC="$(STAGE_CC_WRAPPER) $$r/prev-gcc/xgcc$(exeext) -B$$r/prev-gcc/ -B$(build_tooldir)/bin/" \
+		CC_FOR_BUILD="$(STAGE_CC_WRAPPER) $$r/prev-gcc/xgcc$(exeext) -B$$r/prev-gcc/ -B$(build_tooldir)/bin/" \
+		STAGE_PREFIX=$$r/prev-gcc/ \
+		$(POSTSTAGE1_FLAGS_TO_PASS) || exit 1 ; \
+	cd .. ; \
+	mv prev-gcc stage1-gcc ; \
+	mv gcc stage2-gcc ; \
+	$(STAMP) all-stage2-gcc
+
+configure-stage3-gcc: all-stage2-gcc
+	echo configure-stage3-gcc > stage_last ; \
+	if [ -f stage3-gcc/Makefile ] ; then \
+	  $(STAMP) configure-stage3-gcc ; \
+	  exit 0; \
+	else \
+	  true ; \
+	fi ; \
+	[ -d stage3-gcc ] || mkdir stage3-gcc; \
+	mv stage3-gcc gcc ; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	CC="$(CC)"; export CC; \
+	CFLAGS="$(CFLAGS)"; export CFLAGS; \
+	CXX="$(CXX)"; export CXX; \
+	CXXFLAGS="$(CXXFLAGS)"; export CXXFLAGS; \
+	TOPLEVEL_CONFIGURE_ARGUMENTS="$(TOPLEVEL_CONFIGURE_ARGUMENTS)"; export TOPLEVEL_CONFIGURE_ARGUMENTS; \
+	AR="$(AR)"; export AR; \
+	AS="$(AS)"; export AS; \
+	CC_FOR_BUILD="$(CC_FOR_BUILD)"; export CC_FOR_BUILD; \
+	DLLTOOL="$(DLLTOOL)"; export DLLTOOL; \
+	LD="$(LD)"; export LD; \
+	NM="$(NM)"; export NM; \
+	RANLIB="$(RANLIB)"; export RANLIB; \
+	WINDRES="$(WINDRES)"; export WINDRES; \
+	OBJCOPY="$(OBJCOPY)"; export OBJCOPY; \
+	OBJDUMP="$(OBJDUMP)"; export OBJDUMP; \
+	echo Configuring stage 3 in gcc; \
+	cd gcc || exit 1; \
+	case $(srcdir) in \
+	  \.) \
+	    srcdiroption="--srcdir=."; \
+	    libsrcdir=".";; \
+	  /* | [A-Za-z]:[\\/]*) \
+	    srcdiroption="--srcdir=$(srcdir)/gcc"; \
+	    libsrcdir="$$s/gcc";; \
+	  *) \
+	    srcdiroption="--srcdir=../$(srcdir)/gcc"; \
+	    libsrcdir="$$s/gcc";; \
+	esac; \
+	$(SHELL) $${libsrcdir}/configure \
+	  $(HOST_CONFIGARGS) $${srcdiroption} ; \
+	cd .. ; \
+	mv gcc stage3-gcc ; \
+	$(STAMP) configure-stage3-gcc
+
+# Some files might not exist.  This is disabled 'cause it don't work.
+# cp prev-gcc/objc/objc-parse.c gcc/objc/objc-parse.c || true ; \
+# cp prev-gcc/java/parse.c gcc/java/parse.c || true ; \
+# cp prev-gcc/java/parse-scan.c gcc/java/parse-scan.c || true ; \
+
+all-stage3-gcc: all-stage2-gcc configure-stage3-gcc
+	echo all-stage3-gcc > stage_last ; \
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	mv stage2-gcc prev-gcc ; \
+	mv stage3-gcc gcc ; \
+	cd gcc && \
+	$(MAKE) $(GCC_FLAGS_TO_PASS) \
+		CC="$(STAGE_CC_WRAPPER) $$r/prev-gcc/xgcc$(exeext) -B$$r/prev-gcc/ -B$(build_tooldir)/bin/" \
+		BUILD_CC="$(STAGE_CC_WRAPPER) $$r/prev-gcc/xgcc$(exeext) -B$$r/prev-gcc/ -B$(build_tooldir)/bin/" \
+		CC_FOR_BUILD="$(STAGE_CC_WRAPPER) $$r/prev-gcc/xgcc$(exeext) -B$$r/prev-gcc/ -B$(build_tooldir)/bin/" \
+		STAGE_PREFIX=$$r/prev-gcc/ \
+		$(POSTSTAGE1_FLAGS_TO_PASS) || exit 1 ; \
+	cd .. ; \
+	mv prev-gcc stage2-gcc ; \
+	mv gcc stage3-gcc ; \
+	$(STAMP) all-stage3-gcc
+
+# We only want to compare .o files, so set this!
+objext = .o
+
+compare: all-stage3-gcc
+	r=`${PWD_COMMAND}`; export r; \
+	s=`cd $(srcdir); ${PWD_COMMAND}`; export s; \
+	rm -f .bad_compare ; \
+	cd stage3-gcc; \
+	files=`find . -name "*$(objext)" -print` ; \
+	cd .. ; \
+	for file in $${files} ; do \
+	  cmp --ignore-initial=16 $$r/stage2-gcc/$$file $$r/stage3-gcc/$$file \
+	      > /dev/null 2>&1; \
+	  test $$? -eq 1 && echo $$file differs >> .bad_compare || true; \
+	done ; \
+	if [ -f .bad_compare ]; then \
+	  echo "Bootstrap comparison failure!"; \
+	  cat .bad_compare; \
+	  exit 1; \
+	else \
+	  true; \
+	fi ; \
+        $(STAMP) compare
+
+.PHONY: new-bootstrap
+# This target exists so that everything can be made in one pass.
+# 'all-gcc' has to avoid stomping on the bootstrap-generated gcc for
+# this to work.
+new-bootstrap: compare
+	mv stage3-gcc gcc ; \
+	$(MAKE) all ; \
+	mv gcc stage3-gcc
+
 # --------------------------------------
 # Dependencies between different modules
 # --------------------------------------
diff --git a/configure b/configure
index b397bf1ce9b..0efa37b6d7e 100755
--- a/configure
+++ b/configure
@@ -21,6 +21,8 @@ ac_help="$ac_help
 ac_help="$ac_help
   --enable-maintainer-mode enable make rules and dependencies not useful
                           (and sometimes confusing) to the casual installer"
+ac_help="$ac_help
+  --enable-werror         enable -Werror in bootstrap stage2 and later"
 
 # Initialize some variables set by options.
 # The variables have the same names as the options, with
@@ -579,7 +581,7 @@ else { echo "configure: error: can not run $ac_config_sub" 1>&2; exit 1; }
 fi
 
 echo $ac_n "checking host system type""... $ac_c" 1>&6
-echo "configure:583: checking host system type" >&5
+echo "configure:585: checking host system type" >&5
 
 host_alias=$host
 case "$host_alias" in
@@ -600,7 +602,7 @@ host_os=`echo $host | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\3/'`
 echo "$ac_t""$host" 1>&6
 
 echo $ac_n "checking target system type""... $ac_c" 1>&6
-echo "configure:604: checking target system type" >&5
+echo "configure:606: checking target system type" >&5
 
 target_alias=$target
 case "$target_alias" in
@@ -618,7 +620,7 @@ target_os=`echo $target | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\3/'`
 echo "$ac_t""$target" 1>&6
 
 echo $ac_n "checking build system type""... $ac_c" 1>&6
-echo "configure:622: checking build system type" >&5
+echo "configure:624: checking build system type" >&5
 
 build_alias=$build
 case "$build_alias" in
@@ -673,7 +675,7 @@ test "$program_transform_name" = "" && program_transform_name="s,x,x,"
 # SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
 # ./install, which can be erroneously created by make from ./install.sh.
 echo $ac_n "checking for a BSD compatible install""... $ac_c" 1>&6
-echo "configure:677: checking for a BSD compatible install" >&5
+echo "configure:679: checking for a BSD compatible install" >&5
 if test -z "$INSTALL"; then
 if eval "test \"`echo '$''{'ac_cv_path_install'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -1852,7 +1854,7 @@ fi
 # Extract the first word of "gcc", so it can be a program name with args.
 set dummy gcc; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1856: checking for $ac_word" >&5
+echo "configure:1858: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1882,7 +1884,7 @@ if test -z "$CC"; then
   # Extract the first word of "cc", so it can be a program name with args.
 set dummy cc; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1886: checking for $ac_word" >&5
+echo "configure:1888: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1933,7 +1935,7 @@ fi
       # Extract the first word of "cl", so it can be a program name with args.
 set dummy cl; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1937: checking for $ac_word" >&5
+echo "configure:1939: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1965,7 +1967,7 @@ fi
 fi
 
 echo $ac_n "checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works""... $ac_c" 1>&6
-echo "configure:1969: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works" >&5
+echo "configure:1971: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works" >&5
 
 ac_ext=c
 # CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
@@ -1976,12 +1978,12 @@ cross_compiling=$ac_cv_prog_cc_cross
 
 cat > conftest.$ac_ext << EOF
 
-#line 1980 "configure"
+#line 1982 "configure"
 #include "confdefs.h"
 
 main(){return(0);}
 EOF
-if { (eval echo configure:1985: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:1987: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   ac_cv_prog_cc_works=yes
   # If we can't run a trivial program, we are probably using a cross compiler.
   if (./conftest; exit) 2>/dev/null; then
@@ -2007,12 +2009,12 @@ if test $ac_cv_prog_cc_works = no; then
   { echo "configure: error: installation or configuration problem: C compiler cannot create executables." 1>&2; exit 1; }
 fi
 echo $ac_n "checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler""... $ac_c" 1>&6
-echo "configure:2011: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler" >&5
+echo "configure:2013: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler" >&5
 echo "$ac_t""$ac_cv_prog_cc_cross" 1>&6
 cross_compiling=$ac_cv_prog_cc_cross
 
 echo $ac_n "checking whether we are using GNU C""... $ac_c" 1>&6
-echo "configure:2016: checking whether we are using GNU C" >&5
+echo "configure:2018: checking whether we are using GNU C" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_gcc'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2021,7 +2023,7 @@ else
   yes;
 #endif
 EOF
-if { ac_try='${CC-cc} -E conftest.c'; { (eval echo configure:2025: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } | egrep yes >/dev/null 2>&1; then
+if { ac_try='${CC-cc} -E conftest.c'; { (eval echo configure:2027: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } | egrep yes >/dev/null 2>&1; then
   ac_cv_prog_gcc=yes
 else
   ac_cv_prog_gcc=no
@@ -2040,7 +2042,7 @@ ac_test_CFLAGS="${CFLAGS+set}"
 ac_save_CFLAGS="$CFLAGS"
 CFLAGS=
 echo $ac_n "checking whether ${CC-cc} accepts -g""... $ac_c" 1>&6
-echo "configure:2044: checking whether ${CC-cc} accepts -g" >&5
+echo "configure:2046: checking whether ${CC-cc} accepts -g" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_cc_g'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2076,7 +2078,7 @@ fi
 # Extract the first word of "${ac_tool_prefix}gnatbind", so it can be a program name with args.
 set dummy ${ac_tool_prefix}gnatbind; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:2080: checking for $ac_word" >&5
+echo "configure:2082: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_GNATBIND'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2108,7 +2110,7 @@ if test -n "$ac_tool_prefix"; then
   # Extract the first word of "gnatbind", so it can be a program name with args.
 set dummy gnatbind; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:2112: checking for $ac_word" >&5
+echo "configure:2114: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_GNATBIND'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2141,7 +2143,7 @@ fi
 fi
 
 echo $ac_n "checking whether compiler driver understands Ada""... $ac_c" 1>&6
-echo "configure:2145: checking whether compiler driver understands Ada" >&5
+echo "configure:2147: checking whether compiler driver understands Ada" >&5
 if eval "test \"`echo '$''{'acx_cv_cc_gcc_supports_ada'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -2171,6 +2173,10 @@ else
 fi
 
 
+# By default, C is the only stage 1 langauge.
+stage1_languages=c
+
+
 # Figure out what language subdirectories are present.
 # Look if the user specified --enable-languages="..."; if not, use
 # the environment variable $LANGUAGES if defined. $LANGUAGES might
@@ -2233,10 +2239,11 @@ if test -d ${srcdir}/gcc; then
       ${srcdir}/gcc/[*]/config-lang.in) ;;
       *)
         # From the config-lang.in, get $language, $target_libs, 
-        # $lang_dirs, and $build_by_default
+        # $lang_dirs, $boot_language, and $build_by_default
         language=
         target_libs=
         lang_dirs=
+        boot_language=
         build_by_default=
         . ${lang_frag}
         # This is quite sensitive to the ordering of the case statement arms.
@@ -2269,10 +2276,18 @@ if test -d ${srcdir}/gcc; then
         case $add_this_lang in
 	  no)
             # Remove language-dependent dirs.
-            eval noconfigdirs='"$noconfigdirs "'\"$target_libs $lang_dirs\" ;;
+            eval noconfigdirs='"$noconfigdirs "'\"$target_libs $lang_dirs\"
+	    ;;
           *)
 	    new_enable_languages="$new_enable_languages,$language"
-	    missing_languages=`echo "$missing_languages" | sed "s/,$language,/,/"` ;;
+	    missing_languages=`echo "$missing_languages" | sed "s/,$language,/,/"`
+	    case ${boot_language} in
+	      yes)
+		# Add to (space-separated) list of stage 1 languages.
+		stage1_languages="${stage1_languages} ${language}"
+		;;
+	    esac
+	    ;;
         esac
         ;;
     esac
@@ -3219,7 +3234,7 @@ test -n "$target_alias" && ncn_target_tool_prefix=$target_alias-
   # Extract the first word of "${ncn_tool_prefix}ar", so it can be a program name with args.
 set dummy ${ncn_tool_prefix}ar; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3223: checking for $ac_word" >&5
+echo "configure:3238: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_AR'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3252,7 +3267,7 @@ if test -z "$ac_cv_prog_AR" ; then
     # Extract the first word of "ar", so it can be a program name with args.
 set dummy ar; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3256: checking for $ac_word" >&5
+echo "configure:3271: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_AR'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3291,7 +3306,7 @@ fi
   # Extract the first word of "${ncn_tool_prefix}as", so it can be a program name with args.
 set dummy ${ncn_tool_prefix}as; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3295: checking for $ac_word" >&5
+echo "configure:3310: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_AS'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3324,7 +3339,7 @@ if test -z "$ac_cv_prog_AS" ; then
     # Extract the first word of "as", so it can be a program name with args.
 set dummy as; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3328: checking for $ac_word" >&5
+echo "configure:3343: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_AS'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3363,7 +3378,7 @@ fi
   # Extract the first word of "${ncn_tool_prefix}dlltool", so it can be a program name with args.
 set dummy ${ncn_tool_prefix}dlltool; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3367: checking for $ac_word" >&5
+echo "configure:3382: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_DLLTOOL'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3396,7 +3411,7 @@ if test -z "$ac_cv_prog_DLLTOOL" ; then
     # Extract the first word of "dlltool", so it can be a program name with args.
 set dummy dlltool; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3400: checking for $ac_word" >&5
+echo "configure:3415: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_DLLTOOL'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3435,7 +3450,7 @@ fi
   # Extract the first word of "${ncn_tool_prefix}ld", so it can be a program name with args.
 set dummy ${ncn_tool_prefix}ld; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3439: checking for $ac_word" >&5
+echo "configure:3454: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_LD'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3468,7 +3483,7 @@ if test -z "$ac_cv_prog_LD" ; then
     # Extract the first word of "ld", so it can be a program name with args.
 set dummy ld; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3472: checking for $ac_word" >&5
+echo "configure:3487: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_LD'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3507,7 +3522,7 @@ fi
   # Extract the first word of "${ncn_tool_prefix}nm", so it can be a program name with args.
 set dummy ${ncn_tool_prefix}nm; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3511: checking for $ac_word" >&5
+echo "configure:3526: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_NM'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3540,7 +3555,7 @@ if test -z "$ac_cv_prog_NM" ; then
     # Extract the first word of "nm", so it can be a program name with args.
 set dummy nm; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3544: checking for $ac_word" >&5
+echo "configure:3559: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_NM'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3579,7 +3594,7 @@ fi
   # Extract the first word of "${ncn_tool_prefix}ranlib", so it can be a program name with args.
 set dummy ${ncn_tool_prefix}ranlib; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3583: checking for $ac_word" >&5
+echo "configure:3598: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_RANLIB'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3612,7 +3627,7 @@ if test -z "$ac_cv_prog_RANLIB" ; then
     # Extract the first word of "ranlib", so it can be a program name with args.
 set dummy ranlib; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3616: checking for $ac_word" >&5
+echo "configure:3631: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_RANLIB'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3651,7 +3666,7 @@ fi
   # Extract the first word of "${ncn_tool_prefix}windres", so it can be a program name with args.
 set dummy ${ncn_tool_prefix}windres; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3655: checking for $ac_word" >&5
+echo "configure:3670: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_WINDRES'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3684,7 +3699,7 @@ if test -z "$ac_cv_prog_WINDRES" ; then
     # Extract the first word of "windres", so it can be a program name with args.
 set dummy windres; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3688: checking for $ac_word" >&5
+echo "configure:3703: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_WINDRES'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3723,7 +3738,7 @@ fi
   # Extract the first word of "${ncn_tool_prefix}objcopy", so it can be a program name with args.
 set dummy ${ncn_tool_prefix}objcopy; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3727: checking for $ac_word" >&5
+echo "configure:3742: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_OBJCOPY'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3756,7 +3771,7 @@ if test -z "$ac_cv_prog_OBJCOPY" ; then
     # Extract the first word of "objcopy", so it can be a program name with args.
 set dummy objcopy; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3760: checking for $ac_word" >&5
+echo "configure:3775: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_OBJCOPY'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3795,7 +3810,7 @@ fi
   # Extract the first word of "${ncn_tool_prefix}objdump", so it can be a program name with args.
 set dummy ${ncn_tool_prefix}objdump; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3799: checking for $ac_word" >&5
+echo "configure:3814: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_OBJDUMP'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3828,7 +3843,7 @@ if test -z "$ac_cv_prog_OBJDUMP" ; then
     # Extract the first word of "objdump", so it can be a program name with args.
 set dummy objdump; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3832: checking for $ac_word" >&5
+echo "configure:3847: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_OBJDUMP'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3877,7 +3892,7 @@ fi
   # Extract the first word of "${ncn_target_tool_prefix}ar", so it can be a program name with args.
 set dummy ${ncn_target_tool_prefix}ar; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3881: checking for $ac_word" >&5
+echo "configure:3896: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_AR_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3910,7 +3925,7 @@ if test -z "$ac_cv_prog_AR_FOR_TARGET" ; then
     # Extract the first word of "ar", so it can be a program name with args.
 set dummy ar; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3914: checking for $ac_word" >&5
+echo "configure:3929: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_AR_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3949,7 +3964,7 @@ fi
   # Extract the first word of "${ncn_target_tool_prefix}as", so it can be a program name with args.
 set dummy ${ncn_target_tool_prefix}as; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3953: checking for $ac_word" >&5
+echo "configure:3968: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_AS_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -3982,7 +3997,7 @@ if test -z "$ac_cv_prog_AS_FOR_TARGET" ; then
     # Extract the first word of "as", so it can be a program name with args.
 set dummy as; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:3986: checking for $ac_word" >&5
+echo "configure:4001: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_AS_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4021,7 +4036,7 @@ fi
   # Extract the first word of "${ncn_target_tool_prefix}dlltool", so it can be a program name with args.
 set dummy ${ncn_target_tool_prefix}dlltool; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:4025: checking for $ac_word" >&5
+echo "configure:4040: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_DLLTOOL_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4054,7 +4069,7 @@ if test -z "$ac_cv_prog_DLLTOOL_FOR_TARGET" ; then
     # Extract the first word of "dlltool", so it can be a program name with args.
 set dummy dlltool; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:4058: checking for $ac_word" >&5
+echo "configure:4073: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_DLLTOOL_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4093,7 +4108,7 @@ fi
   # Extract the first word of "${ncn_target_tool_prefix}ld", so it can be a program name with args.
 set dummy ${ncn_target_tool_prefix}ld; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:4097: checking for $ac_word" >&5
+echo "configure:4112: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_LD_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4126,7 +4141,7 @@ if test -z "$ac_cv_prog_LD_FOR_TARGET" ; then
     # Extract the first word of "ld", so it can be a program name with args.
 set dummy ld; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:4130: checking for $ac_word" >&5
+echo "configure:4145: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_LD_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4165,7 +4180,7 @@ fi
   # Extract the first word of "${ncn_target_tool_prefix}nm", so it can be a program name with args.
 set dummy ${ncn_target_tool_prefix}nm; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:4169: checking for $ac_word" >&5
+echo "configure:4184: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_NM_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4198,7 +4213,7 @@ if test -z "$ac_cv_prog_NM_FOR_TARGET" ; then
     # Extract the first word of "nm", so it can be a program name with args.
 set dummy nm; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:4202: checking for $ac_word" >&5
+echo "configure:4217: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_NM_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4237,7 +4252,7 @@ fi
   # Extract the first word of "${ncn_target_tool_prefix}ranlib", so it can be a program name with args.
 set dummy ${ncn_target_tool_prefix}ranlib; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:4241: checking for $ac_word" >&5
+echo "configure:4256: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_RANLIB_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4270,7 +4285,7 @@ if test -z "$ac_cv_prog_RANLIB_FOR_TARGET" ; then
     # Extract the first word of "ranlib", so it can be a program name with args.
 set dummy ranlib; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:4274: checking for $ac_word" >&5
+echo "configure:4289: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_RANLIB_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4309,7 +4324,7 @@ fi
   # Extract the first word of "${ncn_target_tool_prefix}windres", so it can be a program name with args.
 set dummy ${ncn_target_tool_prefix}windres; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:4313: checking for $ac_word" >&5
+echo "configure:4328: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_WINDRES_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4342,7 +4357,7 @@ if test -z "$ac_cv_prog_WINDRES_FOR_TARGET" ; then
     # Extract the first word of "windres", so it can be a program name with args.
 set dummy windres; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:4346: checking for $ac_word" >&5
+echo "configure:4361: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_ncn_cv_WINDRES_FOR_TARGET'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -4409,7 +4424,7 @@ RANLIB_FOR_TARGET=${RANLIB_FOR_TARGET}${extra_ranlibflags_for_target}
 NM_FOR_TARGET=${NM_FOR_TARGET}${extra_nmflags_for_target}
 
 echo $ac_n "checking whether to enable maintainer-specific portions of Makefiles""... $ac_c" 1>&6
-echo "configure:4413: checking whether to enable maintainer-specific portions of Makefiles" >&5
+echo "configure:4428: checking whether to enable maintainer-specific portions of Makefiles" >&5
 # Check whether --enable-maintainer-mode or --disable-maintainer-mode was given.
 if test "${enable_maintainer_mode+set}" = set; then
   enableval="$enable_maintainer_mode"
@@ -4430,6 +4445,44 @@ else
 fi	
 MAINT=$MAINTAINER_MODE_TRUE
 
+# ---------------------
+# GCC bootstrap support
+# ---------------------
+
+# Stage specific cflags for build.
+stage1_cflags="-g"
+case $build in
+  vax-*-*)
+    case ${GCC} in
+      yes) stage1_cflags="-g -Wa,-J" ;;
+      *) stage1_cflags="-g -J" ;;
+    esac ;;
+  powerpc-*-darwin*)
+    # The spiffy cpp-precomp chokes on some legitimate constructs in GCC
+    # sources; use -no-cpp-precomp to get to GNU cpp.
+    # Apple's GCC has bugs in designated initializer handling, so disable
+    # that too.
+    stage1_cflags="-g -no-cpp-precomp -DHAVE_DESIGNATED_INITIALIZERS=0"
+    ;;
+esac
+
+
+# Enable -Werror in bootstrap stage2 and later.
+# Change the default to "no" on release branches.
+# Check whether --enable-werror or --disable-werror was given.
+if test "${enable_werror+set}" = set; then
+  enableval="$enable_werror"
+  :
+else
+  enable_werror=yes
+fi
+
+case ${enable_error} in
+  yes) WERROR=-Werror ;;
+  *) WERROR= ;;
+esac
+
+
 trap '' 1 2 15
 cat > confcache <<\EOF
 # This file is a shell script that caches the results of configure
@@ -4599,6 +4652,7 @@ s%@host_subdir@%$host_subdir%g
 s%@target_subdir@%$target_subdir%g
 s%@CC@%$CC%g
 s%@GNATBIND@%$GNATBIND%g
+s%@stage1_languages@%$stage1_languages%g
 /@maybe_dependencies@/r $maybe_dependencies
 s%@maybe_dependencies@%%g
 /@serialization_dependencies@/r $serialization_dependencies
@@ -4684,6 +4738,8 @@ s%@RAW_CXX_FOR_TARGET_FOR_RECURSIVE_MAKE@%$RAW_CXX_FOR_TARGET_FOR_RECURSIVE_MAKE
 s%@MAINTAINER_MODE_TRUE@%$MAINTAINER_MODE_TRUE%g
 s%@MAINTAINER_MODE_FALSE@%$MAINTAINER_MODE_FALSE%g
 s%@MAINT@%$MAINT%g
+s%@stage1_cflags@%$stage1_cflags%g
+s%@WERROR@%$WERROR%g
 
 CEOF
 EOF
diff --git a/configure.in b/configure.in
index 6fa30221c52..a5ba6e2cad8 100644
--- a/configure.in
+++ b/configure.in
@@ -1070,6 +1070,10 @@ fi
 
 ACX_PROG_GNAT
 
+# By default, C is the only stage 1 langauge.
+stage1_languages=c
+AC_SUBST(stage1_languages)
+
 # Figure out what language subdirectories are present.
 # Look if the user specified --enable-languages="..."; if not, use
 # the environment variable $LANGUAGES if defined. $LANGUAGES might
@@ -1132,10 +1136,11 @@ if test -d ${srcdir}/gcc; then
       ${srcdir}/gcc/[[*]]/config-lang.in) ;;
       *)
         # From the config-lang.in, get $language, $target_libs, 
-        # $lang_dirs, and $build_by_default
+        # $lang_dirs, $boot_language, and $build_by_default
         language=
         target_libs=
         lang_dirs=
+        boot_language=
         build_by_default=
         . ${lang_frag}
         # This is quite sensitive to the ordering of the case statement arms.
@@ -1168,10 +1173,18 @@ if test -d ${srcdir}/gcc; then
         case $add_this_lang in
 	  no)
             # Remove language-dependent dirs.
-            eval noconfigdirs='"$noconfigdirs "'\"$target_libs $lang_dirs\" ;;
+            eval noconfigdirs='"$noconfigdirs "'\"$target_libs $lang_dirs\"
+	    ;;
           *)
 	    new_enable_languages="$new_enable_languages,$language"
-	    missing_languages=`echo "$missing_languages" | sed "s/,$language,/,/"` ;;
+	    missing_languages=`echo "$missing_languages" | sed "s/,$language,/,/"`
+	    case ${boot_language} in
+	      yes)
+		# Add to (space-separated) list of stage 1 languages.
+		stage1_languages="${stage1_languages} ${language}"
+		;;
+	    esac
+	    ;;
         esac
         ;;
     esac
@@ -2184,4 +2197,37 @@ fi
 MAINT=$MAINTAINER_MODE_TRUE
 AC_SUBST(MAINT)dnl
 
+# ---------------------
+# GCC bootstrap support
+# ---------------------
+
+# Stage specific cflags for build.
+stage1_cflags="-g"
+case $build in
+  vax-*-*)
+    case ${GCC} in
+      yes) stage1_cflags="-g -Wa,-J" ;;
+      *) stage1_cflags="-g -J" ;;
+    esac ;;
+  powerpc-*-darwin*)
+    # The spiffy cpp-precomp chokes on some legitimate constructs in GCC
+    # sources; use -no-cpp-precomp to get to GNU cpp.
+    # Apple's GCC has bugs in designated initializer handling, so disable
+    # that too.
+    stage1_cflags="-g -no-cpp-precomp -DHAVE_DESIGNATED_INITIALIZERS=0"
+    ;;
+esac
+AC_SUBST(stage1_cflags)
+
+# Enable -Werror in bootstrap stage2 and later.
+# Change the default to "no" on release branches.
+AC_ARG_ENABLE(werror,
+[  --enable-werror         enable -Werror in bootstrap stage2 and later], [],
+[enable_werror=yes])
+case ${enable_error} in
+  yes) WERROR=-Werror ;;
+  *) WERROR= ;;
+esac
+AC_SUBST(WERROR)
+
 AC_OUTPUT(Makefile)