--- /dev/null
+From: ktkachov <ktkachov@138bc75d-0d04-0410-961f-82ee72b054a4>
+Date: Fri, 8 May 2015 08:25:47 +0000 (+0000)
+Subject: [PATCH 2/13] musl libc config
+X-Git-Url: https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff_plain;h=a9173ceabaf29c16f8ef226fbf98af373a4b2ceb
+
+[PATCH 2/13] musl libc config
+
+2015-05-08 Gregor Richards <gregor.richards@uwaterloo.ca>
+ Szabolcs Nagy <szabolcs.nagy@arm.com>
+
+ * config.gcc (LIBC_MUSL): New tm_defines macro.
+ * config/linux.h (OPTION_MUSL): Define.
+ (MUSL_DYNAMIC_LINKER, MUSL_DYNAMIC_LINKER32,)
+ (MUSL_DYNAMIC_LINKER64, MUSL_DYNAMIC_LINKERX32,)
+ (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.
+ * doc/invoke.texi (GNU/Linux Options): Document -mmusl.
+ * configure.ac (gcc_cv_libc_provides_ssp): Add *-*-musl*.
+ (gcc_cv_target_dl_iterate_phdr): Add *-linux-musl*.
+ * configure: Regenerate.
+
+
+git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@222904 138bc75d-0d04-0410-961f-82ee72b054a4
+---
+
+--- 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.
+@@ -720,6 +720,9 @@ 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"
+ ;;
+--- a/gcc/config/linux.h
++++ b/gcc/config/linux.h
+@@ -32,10 +32,12 @@ see the files COPYING3 and COPYING.RUNTI
+ #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.RUNTI
+ } 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 */
+@@ -81,24 +87,100 @@ see the files COPYING3 and COPYING.RUNTI
+ #define BIONIC_DYNAMIC_LINKER32 "/system/bin/linker"
+ #define BIONIC_DYNAMIC_LINKER64 "/system/bin/linker64"
+ #define BIONIC_DYNAMIC_LINKERX32 "/system/bin/linkerx32"
++/* Should be redefined for each target that supports musl. */
++#define MUSL_DYNAMIC_LINKER "/dev/null"
++#define MUSL_DYNAMIC_LINKER32 "/dev/null"
++#define MUSL_DYNAMIC_LINKER64 "/dev/null"
++#define MUSL_DYNAMIC_LINKERX32 "/dev/null"
+
+ #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
+--- a/gcc/config/linux.opt
++++ b/gcc/config/linux.opt
+@@ -28,5 +28,9 @@ Target Report RejectNegative Var(linux_l
+ Use GNU C library
+
+ muclibc
+-Target Report RejectNegative Var(linux_libc,LIBC_UCLIBC) Negative(mbionic)
++Target Report RejectNegative Var(linux_libc,LIBC_UCLIBC) Negative(mmusl)
+ Use uClibc C library
++
++mmusl
++Target Report RejectNegative Var(linux_libc,LIBC_MUSL) Negative(mbionic)
++Use musl C library
+--- a/gcc/configure
++++ b/gcc/configure
+@@ -27802,6 +27802,9 @@ if test "${gcc_cv_libc_provides_ssp+set}
+ else
+ gcc_cv_libc_provides_ssp=no
+ case "$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.
+@@ -27834,6 +27837,7 @@ 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 "$LINENO" "__stack_chk_fail" "ac_cv_func___stack_chk_fail"
+@@ -27930,6 +27934,9 @@ case "$target" in
+ gcc_cv_target_dl_iterate_phdr=no
+ fi
+ ;;
++ *-linux-musl*)
++ gcc_cv_target_dl_iterate_phdr=yes
++ ;;
+ esac
+
+ if test x$gcc_cv_target_dl_iterate_phdr = xyes; then
+--- a/gcc/configure.ac
++++ b/gcc/configure.ac
+@@ -5282,6 +5282,9 @@ AC_CACHE_CHECK(__stack_chk_fail in targe
+ gcc_cv_libc_provides_ssp,
+ [gcc_cv_libc_provides_ssp=no
+ case "$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.
+@@ -5308,6 +5311,7 @@ AC_CACHE_CHECK(__stack_chk_fail in targe
+ # <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],
+@@ -5381,6 +5385,9 @@ 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
+--- a/gcc/doc/invoke.texi
++++ b/gcc/doc/invoke.texi
+@@ -667,7 +667,7 @@ Objective-C and Objective-C++ Dialects}.
+ -mcpu=@var{cpu}}
+
+ @emph{GNU/Linux Options}
+-@gccoptlist{-mglibc -muclibc -mbionic -mandroid @gol
++@gccoptlist{-mglibc -muclibc -mmusl -mbionic -mandroid @gol
+ -tno-android-cc -tno-android-ld}
+
+ @emph{H8/300 Options}
+@@ -15325,13 +15325,19 @@ These @samp{-m} options are defined for
+ @item -mglibc
+ @opindex mglibc
+ Use the GNU C library. This is the default except
+-on @samp{*-*-linux-*uclibc*} and @samp{*-*-linux-*android*} targets.
++on @samp{*-*-linux-*uclibc*}, @samp{*-*-linux-*musl*} and
++@samp{*-*-linux-*android*} targets.
+
+ @item -muclibc
+ @opindex muclibc
+ Use uClibc C library. This is the default on
+ @samp{*-*-linux-*uclibc*} targets.
+
++@item -mmusl
++@opindex mmusl
++Use the musl C library. This is the default on
++@samp{*-*-linux-*musl*} targets.
++
+ @item -mbionic
+ @opindex mbionic
+ Use Bionic C library. This is the default on
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