Initial commit

8 files changed, 822 insertions, 0 deletions

diff --git a/etc/patches/gcc-4.7.4/musl-support/0001-config.sub-add-musl-support-for-gmp-mpc-mpfr.patch b/etc/patches/gcc-4.7.4/musl-support/0001-config.sub-add-musl-support-for-gmp-mpc-mpfr.patch
new file mode 100644
index 0000000..0dd1b0d
--- /dev/null
+++ b/etc/patches/gcc-4.7.4/musl-support/0001-config.sub-add-musl-support-for-gmp-mpc-mpfr.patch
@@ -0,0 +1,80 @@
+From 491a585201160692ac8683aeb16e884e2537a685 Mon Sep 17 00:00:00 2001
+From: Oliver Reiche <oliver.reiche@huawei.com>
+Date: Thu, 29 Jun 2023 18:20:38 +0200
+Subject: [PATCH 1/7] config.sub: Add musl support for gmp/mpc/mpfr
+
+---
+ gmp/configfsf.sub | 4 ++--
+ mpc/config.sub    | 4 ++--
+ mpfr/config.sub   | 4 ++--
+ 3 files changed, 6 insertions(+), 6 deletions(-)
+
+diff --git a/gmp/configfsf.sub b/gmp/configfsf.sub
+index a649350a6..b08476d3f 100755
+--- a/gmp/configfsf.sub
++++ b/gmp/configfsf.sub
+@@ -120,7 +120,7 @@ esac
+ # Here we must recognize all the valid KERNEL-OS combinations.
+ maybe_os=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\2/'`
+ case $maybe_os in
+-  nto-qnx* | linux-gnu* | linux-dietlibc | linux-newlib* | linux-uclibc* | \
++  nto-qnx* | linux-gnu* | linux-dietlibc | linux-newlib* | linux-musl* | linux-uclibc* | \
+   uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | knetbsd*-gnu* | netbsd*-gnu* | \
+   storm-chaos* | os2-emx* | rtmk-nova*)
+     os=-$maybe_os
+@@ -1262,7 +1262,7 @@ case $os in
+ 	      | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* \
+ 	      | -chorusos* | -chorusrdb* | -cegcc* \
+ 	      | -cygwin* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
+-	      | -mingw32* | -linux-gnu* | -linux-newlib* | -linux-uclibc* \
++	      | -mingw32* | -linux-gnu* | -linux-newlib* | -linux-musl* | -linux-uclibc* \
+ 	      | -uxpv* | -beos* | -mpeix* | -udk* \
+ 	      | -interix* | -uwin* | -mks* | -rhapsody* | -darwin* | -opened* \
+ 	      | -openstep* | -oskit* | -conix* | -pw32* | -nonstopux* \
+diff --git a/mpc/config.sub b/mpc/config.sub
+index 6759825a5..0057add97 100755
+--- a/mpc/config.sub
++++ b/mpc/config.sub
+@@ -120,7 +120,7 @@ esac
+ # Here we must recognize all the valid KERNEL-OS combinations.
+ maybe_os=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\2/'`
+ case $maybe_os in
+-  nto-qnx* | linux-gnu* | linux-dietlibc | linux-newlib* | linux-uclibc* | \
++  nto-qnx* | linux-gnu* | linux-dietlibc | linux-newlib* | linux-musl* | linux-uclibc* | \
+   uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | knetbsd*-gnu* | netbsd*-gnu* | \
+   storm-chaos* | os2-emx* | rtmk-nova*)
+     os=-$maybe_os
+@@ -1250,7 +1250,7 @@ case $os in
+ 	      | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* \
+ 	      | -chorusos* | -chorusrdb* \
+ 	      | -cygwin* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
+-	      | -mingw32* | -linux-gnu* | -linux-newlib* | -linux-uclibc* \
++	      | -mingw32* | -linux-gnu* | -linux-newlib* | -linux-musl* | -linux-uclibc* \
+ 	      | -uxpv* | -beos* | -mpeix* | -udk* \
+ 	      | -interix* | -uwin* | -mks* | -rhapsody* | -darwin* | -opened* \
+ 	      | -openstep* | -oskit* | -conix* | -pw32* | -nonstopux* \
+diff --git a/mpfr/config.sub b/mpfr/config.sub
+index 1761d8bdf..aeb4ba340 100755
+--- a/mpfr/config.sub
++++ b/mpfr/config.sub
+@@ -120,7 +120,7 @@ esac
+ # Here we must recognize all the valid KERNEL-OS combinations.
+ maybe_os=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\2/'`
+ case $maybe_os in
+-  nto-qnx* | linux-gnu* | linux-dietlibc | linux-newlib* | linux-uclibc* | \
++  nto-qnx* | linux-gnu* | linux-dietlibc | linux-newlib* | linux-musl* | linux-uclibc* | \
+   uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | knetbsd*-gnu* | netbsd*-gnu* | \
+   storm-chaos* | os2-emx* | rtmk-nova*)
+     os=-$maybe_os
+@@ -1218,7 +1218,7 @@ case $os in
+ 	      | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* \
+ 	      | -chorusos* | -chorusrdb* \
+ 	      | -cygwin* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
+-	      | -mingw32* | -linux-gnu* | -linux-newlib* | -linux-uclibc* \
++	      | -mingw32* | -linux-gnu* | -linux-newlib* | -linux-musl* | -linux-uclibc* \
+ 	      | -uxpv* | -beos* | -mpeix* | -udk* \
+ 	      | -interix* | -uwin* | -mks* | -rhapsody* | -darwin* | -opened* \
+ 	      | -openstep* | -oskit* | -conix* | -pw32* | -nonstopux* \
+-- 
+2.30.2
+
diff --git a/etc/patches/gcc-4.7.4/musl-support/0002-config.sub-add-musl-support-for-gcc.patch b/etc/patches/gcc-4.7.4/musl-support/0002-config.sub-add-musl-support-for-gcc.patch
new file mode 100644
index 0000000..0c1682c
--- /dev/null
+++ b/etc/patches/gcc-4.7.4/musl-support/0002-config.sub-add-musl-support-for-gcc.patch
@@ -0,0 +1,39 @@
+From c3922f0d82ab03e4702eba4c3359d25fd2139bcf Mon Sep 17 00:00:00 2001
+From: Oliver Reiche <oliver.reiche@huawei.com>
+Date: Thu, 29 Jun 2023 18:04:32 +0200
+Subject: [PATCH 2/7] config.sub: Add musl support for gcc
+
+Backport from GCC 4.8.0
+  Git commit: f08bdd699385e0c8cc3c841da3f4f72d9141f68c
+  Subversion revision: r194449
+
+Co-authored-by: Jan-Benedict Glaw <jbglaw@lug-owl.de>
+---
+ config.sub | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/config.sub b/config.sub
+index 78176a440..deebfcee7 100755
+--- a/config.sub
++++ b/config.sub
+@@ -125,7 +125,7 @@ esac
+ maybe_os=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\2/'`
+ case $maybe_os in
+   nto-qnx* | linux-gnu* | linux-android* | linux-dietlibc | linux-newlib* | \
+-  linux-uclibc* | uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | \
++  linux-musl | linux-uclibc* | uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | \
+   knetbsd*-gnu* | netbsd*-gnu* | \
+   kopensolaris*-gnu* | \
+   storm-chaos* | os2-emx* | rtmk-nova*)
+@@ -1345,7 +1345,7 @@ case $os in
+ 	      | -chorusos* | -chorusrdb* | -cegcc* \
+ 	      | -cygwin* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
+ 	      | -mingw32* | -linux-gnu* | -linux-android* \
+-	      | -linux-newlib* | -linux-uclibc* \
++	      | -linux-newlib* | -linux-musl* | -linux-uclibc* \
+ 	      | -uxpv* | -beos* | -mpeix* | -udk* \
+ 	      | -interix* | -uwin* | -mks* | -rhapsody* | -darwin* | -opened* \
+ 	      | -openstep* | -oskit* | -conix* | -pw32* | -nonstopux* \
+-- 
+2.30.2
+
diff --git a/etc/patches/gcc-4.7.4/musl-support/0003-musl-libc-config.patch b/etc/patches/gcc-4.7.4/musl-support/0003-musl-libc-config.patch
new file mode 100644
index 0000000..fc3d5b0
--- /dev/null
+++ b/etc/patches/gcc-4.7.4/musl-support/0003-musl-libc-config.patch
@@ -0,0 +1,330 @@
+From 2568562d330c29bf2b487a85677cd319d78630bf Mon Sep 17 00:00:00 2001
+From: Oliver Reiche <oliver.reiche@huawei.com>
+Date: Thu, 29 Jun 2023 16:52:26 +0200
+Subject: [PATCH 3/7] musl libc config
+
+Backport from GCC 6.1.0
+  Git commit: 755658a56b57beca14b5fb70afdf1e588a058f7f
+  Subversion revision: r222904
+
+Original description:
+  * 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.
+
+Co-authored-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
+Co-authored-by: Gregor Richards <gregor.richards@uwaterloo.ca>
+---
+ gcc/config.gcc       |   5 +-
+ gcc/config/linux.h   | 110 +++++++++++++++++++++++++++++++++++++------
+ gcc/config/linux.opt |   6 ++-
+ gcc/configure        |   7 +++
+ gcc/configure.ac     |   7 +++
+ gcc/doc/invoke.texi  |  10 +++-
+ 6 files changed, 127 insertions(+), 18 deletions(-)
+
+diff --git a/gcc/config.gcc b/gcc/config.gcc
+index 9503b96cf..96ddb1a92 100644
+--- a/gcc/config.gcc
++++ b/gcc/config.gcc
+@@ -522,7 +522,7 @@ 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"
+ 
+ # Common parts for widely ported systems.
+ case ${target} in
+@@ -625,6 +625,9 @@ 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 fb459e680..064c6067d 100644
+--- a/gcc/config/linux.h
++++ b/gcc/config/linux.h
+@@ -33,10 +33,12 @@ 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()			\
+@@ -51,21 +53,25 @@ 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 */
+@@ -82,19 +88,24 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ #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)
+ 
+ /* Determine whether the entire c99 runtime
+    is present in the runtime library.  */
+@@ -108,3 +119,74 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ /* 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
+diff --git a/gcc/config/linux.opt b/gcc/config/linux.opt
+index ba6b9f83e..f5e94a9b1 100644
+--- a/gcc/config/linux.opt
++++ b/gcc/config/linux.opt
+@@ -28,5 +28,9 @@ Target Report RejectNegative Var(linux_libc,LIBC_GLIBC) Negative(muclibc)
+ 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
+diff --git a/gcc/configure b/gcc/configure
+index 0d8c5e71d..695e7c415 100755
+--- a/gcc/configure
++++ b/gcc/configure
+@@ -26791,6 +26791,9 @@ 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.
+@@ -26824,6 +26827,7 @@ else
+ 	 # <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 "$LINENO" "__stack_chk_fail" "ac_cv_func___stack_chk_fail"
+@@ -26906,6 +26910,9 @@ case "$target" in
+       gcc_cv_target_dl_iterate_phdr=no
+     fi
+     ;;
++  *-linux-musl*)
++    gcc_cv_target_dl_iterate_phdr=yes
++    ;;
+ esac
+ 
+ if test x$gcc_cv_target_dl_iterate_phdr = xyes; then
+diff --git a/gcc/configure.ac b/gcc/configure.ac
+index a78a1d76d..b6425efb4 100644
+--- a/gcc/configure.ac
++++ b/gcc/configure.ac
+@@ -4669,6 +4669,9 @@ AC_CACHE_CHECK(__stack_chk_fail in target C library,
+       gcc_cv_libc_provides_ssp,
+       [gcc_cv_libc_provides_ssp=no
+     case "$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.
+@@ -4702,6 +4705,7 @@ 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],
+@@ -4767,6 +4771,9 @@ 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
+diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
+index 625fef25a..159615fe4 100644
+--- a/gcc/doc/invoke.texi
++++ b/gcc/doc/invoke.texi
+@@ -595,7 +595,7 @@ 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}
+@@ -12879,13 +12879,19 @@ These @samp{-m} options are defined for GNU/Linux targets:
+ @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
+-- 
+2.30.2
+
diff --git a/etc/patches/gcc-4.7.4/musl-support/0004-x86-musl-support.patch b/etc/patches/gcc-4.7.4/musl-support/0004-x86-musl-support.patch
new file mode 100644
index 0000000..012abea
--- /dev/null
+++ b/etc/patches/gcc-4.7.4/musl-support/0004-x86-musl-support.patch
@@ -0,0 +1,50 @@
+From dd5e082250ca7b45ed22f713e10f0ba78b10b798 Mon Sep 17 00:00:00 2001
+From: Oliver Reiche <oliver.reiche@huawei.com>
+Date: Thu, 29 Jun 2023 16:53:50 +0200
+Subject: [PATCH 4/7] x86 musl support
+
+Backport from GCC 6.1.0
+  Git commit: cf57e99350d0b44876979c71986d8ca29c361f83
+  Subversion revision: r223218
+
+Original description:
+  * config/i386/linux.h (MUSL_DYNAMIC_LINKER): Define.
+  * config/i386/linux64.h (MUSL_DYNAMIC_LINKER32): Define.
+  (MUSL_DYNAMIC_LINKER64, MUSL_DYNAMIC_LINKERX32): Define.
+
+Co-authored-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
+Co-authored-by: Gregor Richards <gregor.richards@uwaterloo.ca>
+---
+ gcc/config/i386/linux.h   | 3 +++
+ gcc/config/i386/linux64.h | 7 +++++++
+ 2 files changed, 10 insertions(+)
+
+diff --git a/gcc/config/i386/linux.h b/gcc/config/i386/linux.h
+index 73681fe82..f907adfb1 100644
+--- a/gcc/config/i386/linux.h
++++ b/gcc/config/i386/linux.h
+@@ -22,3 +22,6 @@ along with GCC; see the file COPYING3.  If not see
+ 
+ #define GNU_USER_LINK_EMULATION "elf_i386"
+ #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
++
++#undef MUSL_DYNAMIC_LINKER
++#define MUSL_DYNAMIC_LINKER "/lib/ld-musl-i386.so.1"
+diff --git a/gcc/config/i386/linux64.h b/gcc/config/i386/linux64.h
+index 5b0a212ce..cf361b264 100644
+--- a/gcc/config/i386/linux64.h
++++ b/gcc/config/i386/linux64.h
+@@ -31,3 +31,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+ #define GLIBC_DYNAMIC_LINKER32 "/lib/ld-linux.so.2"
+ #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld-linux-x86-64.so.2"
+ #define GLIBC_DYNAMIC_LINKERX32 "/libx32/ld-linux-x32.so.2"
++
++#undef MUSL_DYNAMIC_LINKER32
++#define MUSL_DYNAMIC_LINKER32 "/lib/ld-musl-i386.so.1"
++#undef MUSL_DYNAMIC_LINKER64
++#define MUSL_DYNAMIC_LINKER64 "/lib/ld-musl-x86_64.so.1"
++#undef MUSL_DYNAMIC_LINKERX32
++#define MUSL_DYNAMIC_LINKERX32 "/lib/ld-musl-x32.so.1"
+-- 
+2.30.2
+
diff --git a/etc/patches/gcc-4.7.4/musl-support/0005-libstdc-workaround-for-musl.patch b/etc/patches/gcc-4.7.4/musl-support/0005-libstdc-workaround-for-musl.patch
new file mode 100644
index 0000000..0b862e0
--- /dev/null
+++ b/etc/patches/gcc-4.7.4/musl-support/0005-libstdc-workaround-for-musl.patch
@@ -0,0 +1,50 @@
+From 6f30aa9b58c145331da46adad18dc38926252547 Mon Sep 17 00:00:00 2001
+From: Oliver Reiche <oliver.reiche@huawei.com>
+Date: Thu, 29 Jun 2023 17:02:18 +0200
+Subject: [PATCH 5/7] libstdc++ workaround for musl
+
+Backport from GCC 6.1.0
+  Git commit: 85da5c3024f731e719c4093314da8edcd1056527
+  Subversion revision: r222329
+
+Original description:
+  * config/os/generic/os_defines.h (_GLIBCXX_GTHREAD_USE_WEAK): Define.
+  * configure.host (os_include_dir): Set to "os/generic" for linux-musl*.
+
+Co-authored-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
+---
+ libstdc++-v3/config/os/generic/os_defines.h | 5 +++++
+ libstdc++-v3/configure.host                 | 3 +++
+ 2 files changed, 8 insertions(+)
+
+diff --git a/libstdc++-v3/config/os/generic/os_defines.h b/libstdc++-v3/config/os/generic/os_defines.h
+index 3199bf30b..b8d7c1636 100644
+--- a/libstdc++-v3/config/os/generic/os_defines.h
++++ b/libstdc++-v3/config/os/generic/os_defines.h
+@@ -33,4 +33,9 @@
+ // System-specific #define, typedefs, corrections, etc, go here.  This
+ // file will come before all others.
+ 
++// Disable the weak reference logic in gthr.h for os/generic because it
++// is broken on every platform unless there is implementation specific
++// workaround in gthr-posix.h and at link-time for static linking.
++#define _GLIBCXX_GTHREAD_USE_WEAK 0
++
+ #endif
+diff --git a/libstdc++-v3/configure.host b/libstdc++-v3/configure.host
+index b0e2cd9ea..df7977151 100644
+--- a/libstdc++-v3/configure.host
++++ b/libstdc++-v3/configure.host
+@@ -242,6 +242,9 @@ case "${host_os}" in
+   freebsd*)
+     os_include_dir="os/bsd/freebsd"
+     ;;
++  linux-musl*)
++    os_include_dir="os/generic"
++    ;;
+   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
+     if [ "$uclibc" = "yes" ]; then
+       os_include_dir="os/uclibc"
+-- 
+2.30.2
+
diff --git a/etc/patches/gcc-4.7.4/musl-support/0006-config.guess-add-musl-support.patch b/etc/patches/gcc-4.7.4/musl-support/0006-config.guess-add-musl-support.patch
new file mode 100644
index 0000000..675ec49
--- /dev/null
+++ b/etc/patches/gcc-4.7.4/musl-support/0006-config.guess-add-musl-support.patch
@@ -0,0 +1,196 @@
+From 3c7b2147778b44abe947fb645074fed0545905ac Mon Sep 17 00:00:00 2001
+From: Oliver Reiche <oliver.reiche@huawei.com>
+Date: Thu, 29 Jun 2023 16:43:25 +0200
+Subject: [PATCH 6/7] config.guess: Add musl support
+
+Backport from GCC 9.1.0
+  Git commit: 29305f6018483963fa79b072cf8e95128f3e2cd8
+  Subversion revision: r261675
+
+Co-authored-by: Ben Elliston <bje@gnu.org>
+---
+ config.guess | 92 ++++++++++++++++++++++++++++++++--------------------
+ 1 file changed, 56 insertions(+), 36 deletions(-)
+
+diff --git a/config.guess b/config.guess
+index b02565c7b..081f4c8b7 100755
+--- a/config.guess
++++ b/config.guess
+@@ -142,6 +142,34 @@ UNAME_VERSION=`(uname -v) 2>/dev/null` || UNAME_VERSION=unknown
+ 
+ # Note: order is significant - the case branches are not exclusive.
+ 
++case "$UNAME_SYSTEM" in
++Linux|GNU|GNU/*)
++	# If the system lacks a compiler, then just pick glibc.
++	# We could probably try harder.
++	LIBC=gnu
++
++	eval $set_cc_for_build
++	cat <<-EOF > "$dummy.c"
++	#include <features.h>
++	#if defined(__UCLIBC__)
++	LIBC=uclibc
++	#elif defined(__dietlibc__)
++	LIBC=dietlibc
++	#else
++	LIBC=gnu
++	#endif
++	EOF
++	eval "`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^LIBC' | sed 's, ,,g'`"
++
++	# If ldd exists, use it to detect musl libc.
++	if command -v ldd >/dev/null && \
++		ldd --version 2>&1 | grep -q ^musl
++	then
++	    LIBC=musl
++	fi
++	;;
++esac
++
+ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
+     *:NetBSD:*:*)
+ 	# NetBSD (nbsd) targets should (where applicable) match one or
+@@ -872,56 +900,48 @@ EOF
+ 	  EV68*) UNAME_MACHINE=alphaev68 ;;
+ 	esac
+ 	objdump --private-headers /bin/sh | grep -q ld.so.1
+-	if test "$?" = 0 ; then LIBC="libc1" ; else LIBC="" ; fi
+-	echo ${UNAME_MACHINE}-unknown-linux-gnu${LIBC}
++	if test "$?" = 0 ; then LIBC="gnulibc1" ; fi
++	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+ 	exit ;;
+     arm*:Linux:*:*)
+ 	eval $set_cc_for_build
+ 	if echo __ARM_EABI__ | $CC_FOR_BUILD -E - 2>/dev/null \
+ 	    | grep -q __ARM_EABI__
+ 	then
+-	    echo ${UNAME_MACHINE}-unknown-linux-gnu
++	    echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+ 	else
+ 	    if echo __ARM_PCS_VFP | $CC_FOR_BUILD -E - 2>/dev/null \
+ 		| grep -q __ARM_PCS_VFP
+ 	    then
+-		echo ${UNAME_MACHINE}-unknown-linux-gnueabi
++		echo ${UNAME_MACHINE}-unknown-linux-${LIBC}eabi
+ 	    else
+-		echo ${UNAME_MACHINE}-unknown-linux-gnueabihf
++		echo ${UNAME_MACHINE}-unknown-linux-${LIBC}eabihf
+ 	    fi
+ 	fi
+ 	exit ;;
+     avr32*:Linux:*:*)
+-	echo ${UNAME_MACHINE}-unknown-linux-gnu
++	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+ 	exit ;;
+     cris:Linux:*:*)
+-	echo cris-axis-linux-gnu
++	echo cris-axis-linux-${LIBC}
+ 	exit ;;
+     crisv32:Linux:*:*)
+-	echo crisv32-axis-linux-gnu
++	echo crisv32-axis-linux-${LIBC}
+ 	exit ;;
+     frv:Linux:*:*)
+-	echo frv-unknown-linux-gnu
++	echo frv-unknown-linux-${LIBC}
+ 	exit ;;
+     i*86:Linux:*:*)
+-	LIBC=gnu
+-	eval $set_cc_for_build
+-	sed 's/^	//' << EOF >$dummy.c
+-	#ifdef __dietlibc__
+-	LIBC=dietlibc
+-	#endif
+-EOF
+-	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^LIBC'`
+ 	echo "${UNAME_MACHINE}-pc-linux-${LIBC}"
+ 	exit ;;
+     ia64:Linux:*:*)
+-	echo ${UNAME_MACHINE}-unknown-linux-gnu
++	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+ 	exit ;;
+     m32r*:Linux:*:*)
+-	echo ${UNAME_MACHINE}-unknown-linux-gnu
++	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+ 	exit ;;
+     m68*:Linux:*:*)
+-	echo ${UNAME_MACHINE}-unknown-linux-gnu
++	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+ 	exit ;;
+     mips:Linux:*:* | mips64:Linux:*:*)
+ 	eval $set_cc_for_build
+@@ -940,54 +960,54 @@ EOF
+ 	#endif
+ EOF
+ 	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^CPU'`
+-	test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; }
++	test x"${CPU}" != x && { echo "${CPU}-unknown-linux-${LIBC}"; exit; }
+ 	;;
+     or32:Linux:*:*)
+-	echo or32-unknown-linux-gnu
++	echo or32-unknown-linux-${LIBC}
+ 	exit ;;
+     padre:Linux:*:*)
+-	echo sparc-unknown-linux-gnu
++	echo sparc-unknown-linux-${LIBC}
+ 	exit ;;
+     parisc64:Linux:*:* | hppa64:Linux:*:*)
+-	echo hppa64-unknown-linux-gnu
++	echo hppa64-unknown-linux-${LIBC}
+ 	exit ;;
+     parisc:Linux:*:* | hppa:Linux:*:*)
+ 	# Look for CPU level
+ 	case `grep '^cpu[^a-z]*:' /proc/cpuinfo 2>/dev/null | cut -d' ' -f2` in
+-	  PA7*) echo hppa1.1-unknown-linux-gnu ;;
+-	  PA8*) echo hppa2.0-unknown-linux-gnu ;;
+-	  *)    echo hppa-unknown-linux-gnu ;;
++	  PA7*) echo hppa1.1-unknown-linux-${LIBC} ;;
++	  PA8*) echo hppa2.0-unknown-linux-${LIBC} ;;
++	  *)    echo hppa-unknown-linux-${LIBC} ;;
+ 	esac
+ 	exit ;;
+     ppc64:Linux:*:*)
+-	echo powerpc64-unknown-linux-gnu
++	echo powerpc64-unknown-linux-${LIBC}
+ 	exit ;;
+     ppc:Linux:*:*)
+-	echo powerpc-unknown-linux-gnu
++	echo powerpc-unknown-linux-${LIBC}
+ 	exit ;;
+     s390:Linux:*:* | s390x:Linux:*:*)
+ 	echo ${UNAME_MACHINE}-ibm-linux
+ 	exit ;;
+     sh64*:Linux:*:*)
+-	echo ${UNAME_MACHINE}-unknown-linux-gnu
++	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+ 	exit ;;
+     sh*:Linux:*:*)
+-	echo ${UNAME_MACHINE}-unknown-linux-gnu
++	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+ 	exit ;;
+     sparc:Linux:*:* | sparc64:Linux:*:*)
+-	echo ${UNAME_MACHINE}-unknown-linux-gnu
++	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+ 	exit ;;
+     tile*:Linux:*:*)
+-	echo ${UNAME_MACHINE}-unknown-linux-gnu
++	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+ 	exit ;;
+     vax:Linux:*:*)
+-	echo ${UNAME_MACHINE}-dec-linux-gnu
++	echo ${UNAME_MACHINE}-dec-linux-${LIBC}
+ 	exit ;;
+     x86_64:Linux:*:*)
+-	echo x86_64-unknown-linux-gnu
++	echo x86_64-unknown-linux-${LIBC}
+ 	exit ;;
+     xtensa*:Linux:*:*)
+-	echo ${UNAME_MACHINE}-unknown-linux-gnu
++	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+ 	exit ;;
+     i*86:DYNIX/ptx:4*:*)
+ 	# ptx 4.0 does uname -s correctly, with DYNIX/ptx in there.
+-- 
+2.30.2
+
diff --git a/etc/patches/gcc-4.7.4/musl-support/0007-config.guess-detect-glibc-via-__GLIBC__.patch b/etc/patches/gcc-4.7.4/musl-support/0007-config.guess-detect-glibc-via-__GLIBC__.patch
new file mode 100644
index 0000000..ea62d6b
--- /dev/null
+++ b/etc/patches/gcc-4.7.4/musl-support/0007-config.guess-detect-glibc-via-__GLIBC__.patch
@@ -0,0 +1,70 @@
+From 32088af3619e49aecec44260d594fdcf590bfe00 Mon Sep 17 00:00:00 2001
+From: Oliver Reiche <oliver.reiche@huawei.com>
+Date: Wed, 19 Jul 2023 11:55:37 +0200
+Subject: [PATCH] config.guess: Detect glibc via __GLIBC__
+
+Backport from GCC 11.1.0
+  Git commit: 53a90650663e59948f86505660604b5769cf808c and
+              74af13c174714dd3b9f1ded4b39955f003c16361
+
+Co-authored-by: Iain Sandoe <iain@sandoe.co.uk>
+Co-authored-by: Kito Cheng <kito.cheng@sifive.com>
+---
+ config.guess | 30 ++++++++++++++++++++----------
+ 1 file changed, 20 insertions(+), 10 deletions(-)
+
+diff --git a/config.guess b/config.guess
+index 081f4c8b7..3d378a144 100755
+--- a/config.guess
++++ b/config.guess
+@@ -144,9 +144,7 @@ UNAME_VERSION=`(uname -v) 2>/dev/null` || UNAME_VERSION=unknown
+ 
+ case "$UNAME_SYSTEM" in
+ Linux|GNU|GNU/*)
+-	# If the system lacks a compiler, then just pick glibc.
+-	# We could probably try harder.
+-	LIBC=gnu
++	LIBC=unknown
+ 
+ 	eval $set_cc_for_build
+ 	cat <<-EOF > "$dummy.c"
+@@ -155,17 +153,29 @@ Linux|GNU|GNU/*)
+ 	LIBC=uclibc
+ 	#elif defined(__dietlibc__)
+ 	LIBC=dietlibc
+-	#else
++	#elif defined(__GLIBC__)
+ 	LIBC=gnu
++	#else
++	#include <stdarg.h>
++ 	/* First heuristic to detect musl libc.  */
++	#ifdef __DEFINED_va_list
++	LIBC=musl
++	#endif
+ 	#endif
+ 	EOF
+-	eval "`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^LIBC' | sed 's, ,,g'`"
++	eval "`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^LIBC' | sed 's, ,,g'`"
+ 
+-	# If ldd exists, use it to detect musl libc.
+-	if command -v ldd >/dev/null && \
+-		ldd --version 2>&1 | grep -q ^musl
+-	then
+-	    LIBC=musl
++	# Second heuristic to detect musl libc.
++	if [ "$LIBC" = unknown ] &&
++	   command -v ldd >/dev/null &&
++	   ldd --version 2>&1 | grep -q ^musl; then
++		LIBC=musl
++	fi
++
++	# If the system lacks a compiler, then just pick glibc.
++	# We could probably try harder.
++	if [ "$LIBC" = unknown ]; then
++		LIBC=gnu
+ 	fi
+ 	;;
+ esac
+-- 
+2.30.2
+
diff --git a/etc/patches/gcc-4.7.4/musl-support/series b/etc/patches/gcc-4.7.4/musl-support/series
new file mode 100644
index 0000000..00daf30
--- /dev/null
+++ b/etc/patches/gcc-4.7.4/musl-support/series
@@ -0,0 +1,7 @@
+0001-config.sub-add-musl-support-for-gmp-mpc-mpfr.patch
+0002-config.sub-add-musl-support-for-gcc.patch
+0003-musl-libc-config.patch
+0004-x86-musl-support.patch
+0005-libstdc-workaround-for-musl.patch
+0006-config.guess-add-musl-support.patch
+0007-config.guess-detect-glibc-via-__GLIBC__.patch