config changes for musl libc support

On behalf of Szabolcs.Nagy@arm.com

2015-04-22  Gregor Richards  <gregor.richards@uwaterloo.ca>

	* config.gcc (LIBC_MUSL): New tm_defines macro.
	* config/linux.h (OPTION_MUSL): Define.
	(INCLUDE_DEFAULTS_MUSL_GPP, INCLUDE_DEFAULTS_MUSL_LOCAL,)
	(INCLUDE_DEFAULTS_MUSL_PREFIX, INCLUDE_DEFAULTS_MUSL_CROSS,)
	(INCLUDE_DEFAULTS_MUSL_TOOL, INCLUDE_DEFAULTS_MUSL_NATIVE): Define.

	* config/linux.opt (mmusl): New option.
	* configure.ac (gcc_cv_libc_provides_ssp): Add *-*-musl*.
	(gcc_cv_target_dl_iterate_phdr): Add *-linux-musl*.

	* configure: Regenerate.

From-SVN: r222326

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 27620dd3761c128e3bdbcae205a2339ef06cab64..de916806285e40314b60489dcaaaa7eb826e4adc 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,17 @@
+2015-04-22  Gregor Richards  <gregor.richards@uwaterloo.ca>
+
+       * config.gcc (LIBC_MUSL): New tm_defines macro.
+       * config/linux.h (OPTION_MUSL): Define.
+       (INCLUDE_DEFAULTS_MUSL_GPP, INCLUDE_DEFAULTS_MUSL_LOCAL,)
+       (INCLUDE_DEFAULTS_MUSL_PREFIX, INCLUDE_DEFAULTS_MUSL_CROSS,)
+       (INCLUDE_DEFAULTS_MUSL_TOOL, INCLUDE_DEFAULTS_MUSL_NATIVE): Define.
+
+       * config/linux.opt (mmusl): New option.
+       * configure.ac (gcc_cv_libc_provides_ssp): Add *-*-musl*.
+       (gcc_cv_target_dl_iterate_phdr): Add *-linux-musl*.
+
+       * configure: Regenerate.
+
 2015-04-22  Yury Gribov  <y.gribov@samsung.com>
 
        * doc/invoke.texi (-fsanitize-sections): Update description.

diff --git a/gcc/config.gcc b/gcc/config.gcc
index a1df043328561eac20fc3ad5a0ce499eacb8991b..0176ca2386dfa40e47b0516ed24308f3aa35205f 100644 (file)
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -575,7 +575,7 @@ case ${target} in
 esac
 
 # Common C libraries.
-tm_defines="$tm_defines LIBC_GLIBC=1 LIBC_UCLIBC=2 LIBC_BIONIC=3"
+tm_defines="$tm_defines LIBC_GLIBC=1 LIBC_UCLIBC=2 LIBC_BIONIC=3 LIBC_MUSL=4"
 
 # 32-bit x86 processors supported by --with-arch=.  Each processor
 # MUST be separated by exactly one space.
@@ -725,6 +725,9 @@ case ${target} in
     *-*-*uclibc*)
       tm_defines="$tm_defines DEFAULT_LIBC=LIBC_UCLIBC"
       ;;
+    *-*-*musl*)
+      tm_defines="$tm_defines DEFAULT_LIBC=LIBC_MUSL"
+      ;;
     *)
       tm_defines="$tm_defines DEFAULT_LIBC=LIBC_GLIBC"
       ;;

diff --git a/gcc/config/linux.h b/gcc/config/linux.h
index 857389a8c2dc408fac99dfb7187247f04685fcfa..cda87bfe2b8497a6b5fb9400d551329296243d81 100644 (file)
--- a/gcc/config/linux.h
+++ b/gcc/config/linux.h
@@ -32,10 +32,12 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
 #define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC)
 #define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC)
+#define OPTION_MUSL   (DEFAULT_LIBC == LIBC_MUSL)
 #else
 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
 #define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC)
 #define OPTION_BIONIC (linux_libc == LIBC_BIONIC)
+#define OPTION_MUSL   (linux_libc == LIBC_MUSL)
 #endif
 
 #define GNU_USER_TARGET_OS_CPP_BUILTINS()                      \
@@ -50,21 +52,25 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     } while (0)
 
 /* Determine which dynamic linker to use depending on whether GLIBC or
-   uClibc or Bionic is the default C library and whether
-   -muclibc or -mglibc or -mbionic has been passed to change the default.  */
+   uClibc or Bionic or musl is the default C library and whether
+   -muclibc or -mglibc or -mbionic or -mmusl has been passed to change
+   the default.  */
 
-#define CHOOSE_DYNAMIC_LINKER1(LIBC1, LIBC2, LIBC3, LD1, LD2, LD3)     \
-  "%{" LIBC2 ":" LD2 ";:%{" LIBC3 ":" LD3 ";:" LD1 "}}"
+#define CHOOSE_DYNAMIC_LINKER1(LIBC1, LIBC2, LIBC3, LIBC4, LD1, LD2, LD3, LD4) \
+  "%{" LIBC2 ":" LD2 ";:%{" LIBC3 ":" LD3 ";:%{" LIBC4 ":" LD4 ";:" LD1 "}}}"
 
 #if DEFAULT_LIBC == LIBC_GLIBC
-#define CHOOSE_DYNAMIC_LINKER(G, U, B) \
-  CHOOSE_DYNAMIC_LINKER1 ("mglibc", "muclibc", "mbionic", G, U, B)
+#define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \
+  CHOOSE_DYNAMIC_LINKER1 ("mglibc", "muclibc", "mbionic", "mmusl", G, U, B, M)
 #elif DEFAULT_LIBC == LIBC_UCLIBC
-#define CHOOSE_DYNAMIC_LINKER(G, U, B) \
-  CHOOSE_DYNAMIC_LINKER1 ("muclibc", "mglibc", "mbionic", U, G, B)
+#define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \
+  CHOOSE_DYNAMIC_LINKER1 ("muclibc", "mglibc", "mbionic", "mmusl", U, G, B, M)
 #elif DEFAULT_LIBC == LIBC_BIONIC
-#define CHOOSE_DYNAMIC_LINKER(G, U, B) \
-  CHOOSE_DYNAMIC_LINKER1 ("mbionic", "mglibc", "muclibc", B, G, U)
+#define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \
+  CHOOSE_DYNAMIC_LINKER1 ("mbionic", "mglibc", "muclibc", "mmusl", B, G, U, M)
+#elif DEFAULT_LIBC == LIBC_MUSL
+#define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \
+  CHOOSE_DYNAMIC_LINKER1 ("mmusl", "mglibc", "muclibc", "mbionic", M, G, U, B)
 #else
 #error "Unsupported DEFAULT_LIBC"
 #endif /* DEFAULT_LIBC */
@@ -84,21 +90,92 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 
 #define GNU_USER_DYNAMIC_LINKER                                                \
   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER,  \
-                        BIONIC_DYNAMIC_LINKER)
+                        BIONIC_DYNAMIC_LINKER, MUSL_DYNAMIC_LINKER)
 #define GNU_USER_DYNAMIC_LINKER32                                      \
   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, \
-                        BIONIC_DYNAMIC_LINKER32)
+                        BIONIC_DYNAMIC_LINKER32, MUSL_DYNAMIC_LINKER32)
 #define GNU_USER_DYNAMIC_LINKER64                                      \
   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \
-                        BIONIC_DYNAMIC_LINKER64)
+                        BIONIC_DYNAMIC_LINKER64, MUSL_DYNAMIC_LINKER64)
 #define GNU_USER_DYNAMIC_LINKERX32                                     \
   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERX32, UCLIBC_DYNAMIC_LINKERX32, \
-                        BIONIC_DYNAMIC_LINKERX32)
+                        BIONIC_DYNAMIC_LINKERX32, MUSL_DYNAMIC_LINKERX32)
 
 /* Whether we have Bionic libc runtime */
 #undef TARGET_HAS_BIONIC
 #define TARGET_HAS_BIONIC (OPTION_BIONIC)
 
+/* musl avoids problematic includes by rearranging the include directories.
+ * Unfortunately, this is mostly duplicated from cppdefault.c */
+#if DEFAULT_LIBC == LIBC_MUSL
+#define INCLUDE_DEFAULTS_MUSL_GPP                      \
+    { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1,              \
+      GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 },          \
+    { GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1,         \
+      GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 1 },          \
+    { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1,     \
+      GPLUSPLUS_INCLUDE_DIR_ADD_SYSROOT, 0 },
+
+#ifdef LOCAL_INCLUDE_DIR
+#define INCLUDE_DEFAULTS_MUSL_LOCAL                    \
+    { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 2 },              \
+    { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 0 },
+#else
+#define INCLUDE_DEFAULTS_MUSL_LOCAL
+#endif
+
+#ifdef PREFIX_INCLUDE_DIR
+#define INCLUDE_DEFAULTS_MUSL_PREFIX                   \
+    { PREFIX_INCLUDE_DIR, 0, 0, 1, 0, 0},
+#else
+#define INCLUDE_DEFAULTS_MUSL_PREFIX
+#endif
+
+#ifdef CROSS_INCLUDE_DIR
+#define INCLUDE_DEFAULTS_MUSL_CROSS                    \
+    { CROSS_INCLUDE_DIR, "GCC", 0, 0, 0, 0},
+#else
+#define INCLUDE_DEFAULTS_MUSL_CROSS
+#endif
+
+#ifdef TOOL_INCLUDE_DIR
+#define INCLUDE_DEFAULTS_MUSL_TOOL                     \
+    { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1, 0, 0},
+#else
+#define INCLUDE_DEFAULTS_MUSL_TOOL
+#endif
+
+#ifdef NATIVE_SYSTEM_HEADER_DIR
+#define INCLUDE_DEFAULTS_MUSL_NATIVE                   \
+    { NATIVE_SYSTEM_HEADER_DIR, 0, 0, 0, 1, 2 },       \
+    { NATIVE_SYSTEM_HEADER_DIR, 0, 0, 0, 1, 0 },
+#else
+#define INCLUDE_DEFAULTS_MUSL_NATIVE
+#endif
+
+#if defined (CROSS_DIRECTORY_STRUCTURE) && !defined (TARGET_SYSTEM_ROOT)
+# undef INCLUDE_DEFAULTS_MUSL_LOCAL
+# define INCLUDE_DEFAULTS_MUSL_LOCAL
+# undef INCLUDE_DEFAULTS_MUSL_NATIVE
+# define INCLUDE_DEFAULTS_MUSL_NATIVE
+#else
+# undef INCLUDE_DEFAULTS_MUSL_CROSS
+# define INCLUDE_DEFAULTS_MUSL_CROSS
+#endif
+
+#undef INCLUDE_DEFAULTS
+#define INCLUDE_DEFAULTS                               \
+  {                                                    \
+    INCLUDE_DEFAULTS_MUSL_GPP                          \
+    INCLUDE_DEFAULTS_MUSL_PREFIX                       \
+    INCLUDE_DEFAULTS_MUSL_CROSS                                \
+    INCLUDE_DEFAULTS_MUSL_TOOL                         \
+    INCLUDE_DEFAULTS_MUSL_NATIVE                       \
+    { GCC_INCLUDE_DIR, "GCC", 0, 1, 0, 0 },            \
+    { 0, 0, 0, 0, 0, 0 }                               \
+  }
+#endif
+
 #if (DEFAULT_LIBC == LIBC_UCLIBC) && defined (SINGLE_LIBC) /* uClinux */
 /* This is a *uclinux* target.  We don't define below macros to normal linux
    versions, because doing so would require *uclinux* targets to include

diff --git a/gcc/config/linux.opt b/gcc/config/linux.opt
index c054338443bc68b2157d66589cf502788c829252..9334f747332972745ba9f79dad0983e9093caae6 100644 (file)
--- a/gcc/config/linux.opt
+++ b/gcc/config/linux.opt
@@ -30,3 +30,7 @@ Use GNU C library
 muclibc
 Target Report RejectNegative Var(linux_libc,LIBC_UCLIBC) Negative(mbionic)
 Use uClibc C library
+
+mmusl
+Target Report RejectNegative Var(linux_libc,LIBC_MUSL) Negative(mglibc)
+Use musl C library

diff --git a/gcc/configure b/gcc/configure
index 9523773e721bd8dd162aca96671a29d037bc10c2..5345f695404d1c5ceeb4d67c806e647695df72f2 100755 (executable)
--- a/gcc/configure
+++ b/gcc/configure
@@ -27678,6 +27678,9 @@ if test "${gcc_cv_libc_provides_ssp+set}" = set; then :
 else
   gcc_cv_libc_provides_ssp=no
     case "$target" in
+       *-*-musl*)
+        # All versions of musl provide stack protector
+        gcc_cv_libc_provides_ssp=yes;;
        *-*-linux* | *-*-kfreebsd*-gnu | *-*-knetbsd*-gnu)
       # glibc 2.4 and later provides __stack_chk_fail and
       # either __stack_chk_guard, or TLS access to stack guard canary.
@@ -27710,6 +27713,7 @@ fi
         # <http://gcc.gnu.org/ml/gcc/2008-10/msg00130.html>) and for now
         # simply assert that glibc does provide this, which is true for all
         # realistically usable GNU/Hurd configurations.
+        # All supported versions of musl provide it as well
         gcc_cv_libc_provides_ssp=yes;;
        *-*-darwin* | *-*-freebsd*)
         ac_fn_c_check_func "$LINENO" "__stack_chk_fail" "ac_cv_func___stack_chk_fail"
@@ -27806,6 +27810,9 @@ case "$target" in
       gcc_cv_target_dl_iterate_phdr=no
     fi
     ;;
+  *-linux-musl*)
+    gcc_cv_target_dl_iterate_phdr=yes
+    ;;
 esac
 
 if test x$gcc_cv_target_dl_iterate_phdr = xyes; then

diff --git a/gcc/configure.ac b/gcc/configure.ac
index 68b0ee83fac8be32fcc4618003f489c211eeae5a..27ecdcda6c0bcd6043a00d6ceff03afbdec0da46 100644 (file)
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -5199,6 +5199,9 @@ AC_CACHE_CHECK(__stack_chk_fail in target C library,
       gcc_cv_libc_provides_ssp,
       [gcc_cv_libc_provides_ssp=no
     case "$target" in
+       *-*-musl*)
+        # All versions of musl provide stack protector
+        gcc_cv_libc_provides_ssp=yes;;
        *-*-linux* | *-*-kfreebsd*-gnu | *-*-knetbsd*-gnu)
       # glibc 2.4 and later provides __stack_chk_fail and
       # either __stack_chk_guard, or TLS access to stack guard canary.
@@ -5225,6 +5228,7 @@ AC_CACHE_CHECK(__stack_chk_fail in target C library,
         # <http://gcc.gnu.org/ml/gcc/2008-10/msg00130.html>) and for now
         # simply assert that glibc does provide this, which is true for all
         # realistically usable GNU/Hurd configurations.
+        # All supported versions of musl provide it as well
         gcc_cv_libc_provides_ssp=yes;;
        *-*-darwin* | *-*-freebsd*)
         AC_CHECK_FUNC(__stack_chk_fail,[gcc_cv_libc_provides_ssp=yes],
@@ -5298,6 +5302,9 @@ case "$target" in
       gcc_cv_target_dl_iterate_phdr=no
     fi
     ;;
+  *-linux-musl*)
+    gcc_cv_target_dl_iterate_phdr=yes
+    ;;
 esac
 GCC_TARGET_TEMPLATE([TARGET_DL_ITERATE_PHDR])
 if test x$gcc_cv_target_dl_iterate_phdr = xyes; then