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				@@ -0,0 +1,320 @@ 
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				+--- a/gcc/config.gcc 
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				++++ b/gcc/config.gcc 
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				+@@ -594,7 +594,7 @@ case ${target} in 
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				+ esac 
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				+  
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				+ # Common C libraries. 
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				+-tm_defines="$tm_defines LIBC_GLIBC=1 LIBC_UCLIBC=2 LIBC_BIONIC=3" 
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				++tm_defines="$tm_defines LIBC_GLIBC=1 LIBC_UCLIBC=2 LIBC_BIONIC=3 LIBC_MUSL=4" 
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				+  
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				+ # 32-bit x86 processors supported by --with-arch=.  Each processor 
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				+ # MUST be separated by exactly one space. 
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				+@@ -719,6 +719,9 @@ case ${target} in 
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				+     *-*-*uclibc*) 
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				+       tm_defines="$tm_defines DEFAULT_LIBC=LIBC_UCLIBC" 
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				+       ;; 
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				++    *-*-*musl*) 
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				++      tm_defines="$tm_defines DEFAULT_LIBC=LIBC_MUSL" 
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				++      ;; 
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				+     *) 
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				+       tm_defines="$tm_defines DEFAULT_LIBC=LIBC_GLIBC" 
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				+       ;; 
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				+--- a/gcc/config/arm/linux-eabi.h 
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				++++ b/gcc/config/arm/linux-eabi.h 
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				+@@ -77,6 +77,10 @@ 
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				+     %{mfloat-abi=soft*:" GLIBC_DYNAMIC_LINKER_SOFT_FLOAT "} \ 
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				+     %{!mfloat-abi=*:" GLIBC_DYNAMIC_LINKER_DEFAULT "}" 
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				+  
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				++/* musl has no "classic" (i.e. broken) mode */ 
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				++#undef  MUSL_DYNAMIC_LINKER 
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				++#define MUSL_DYNAMIC_LINKER "/lib/ld-musl-arm.so.1" 
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				++ 
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				+ /* At this point, bpabi.h will have clobbered LINK_SPEC.  We want to 
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				+    use the GNU/Linux version, not the generic BPABI version.  */ 
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				+ #undef  LINK_SPEC 
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				+--- a/gcc/config/i386/linux.h 
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				++++ b/gcc/config/i386/linux.h 
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				+@@ -21,3 +21,4 @@ along with GCC; see the file COPYING3.   
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				+  
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				+ #define GNU_USER_LINK_EMULATION "elf_i386" 
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				+ #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2" 
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				++#define MUSL_DYNAMIC_LINKER "/lib/ld-musl-i386.so.1" 
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				+--- a/gcc/config/i386/linux64.h 
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				++++ b/gcc/config/i386/linux64.h 
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				+@@ -30,3 +30,7 @@ see the files COPYING3 and COPYING.RUNTI 
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				+ #define GLIBC_DYNAMIC_LINKER32 "/lib/ld-linux.so.2" 
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				+ #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld-linux-x86-64.so.2" 
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				+ #define GLIBC_DYNAMIC_LINKERX32 "/libx32/ld-linux-x32.so.2" 
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				++ 
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				++#define MUSL_DYNAMIC_LINKER32 "/lib/ld-musl-i386.so.1" 
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				++#define MUSL_DYNAMIC_LINKER64 "/lib/ld-musl-x86_64.so.1" 
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				++#define MUSL_DYNAMIC_LINKERX32 "/lib/ld-musl-x32.so.1" 
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				+--- a/gcc/config/linux.h 
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				++++ b/gcc/config/linux.h 
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				+@@ -32,10 +32,12 @@ see the files COPYING3 and COPYING.RUNTI 
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				+ #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC) 
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				+ #define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC) 
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				+ #define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC) 
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				++#define OPTION_MUSL   (DEFAULT_LIBC == LIBC_MUSL) 
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				+ #else 
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				+ #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC) 
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				+ #define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC) 
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				+ #define OPTION_BIONIC (linux_libc == LIBC_BIONIC) 
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				++#define OPTION_MUSL   (linux_libc == LIBC_MUSL) 
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				+ #endif 
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				+  
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				+ #define GNU_USER_TARGET_OS_CPP_BUILTINS()			\ 
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				+@@ -53,18 +55,21 @@ see the files COPYING3 and COPYING.RUNTI 
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				+    uClibc or Bionic is the default C library and whether 
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				+    -muclibc or -mglibc or -mbionic has been passed to change the default.  */ 
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				+  
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				+-#define CHOOSE_DYNAMIC_LINKER1(LIBC1, LIBC2, LIBC3, LD1, LD2, LD3)	\ 
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				+-  "%{" LIBC2 ":" LD2 ";:%{" LIBC3 ":" LD3 ";:" LD1 "}}" 
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				++#define CHOOSE_DYNAMIC_LINKER1(LIBC1, LIBC2, LIBC3, LIBC4, LD1, LD2, LD3, LD4)	\ 
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				++  "%{" LIBC2 ":" LD2 ";:%{" LIBC3 ":" LD3 ";:%{" LIBC4 ":" LD4 ";:" LD1 "}}}" 
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				+  
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				+ #if DEFAULT_LIBC == LIBC_GLIBC 
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				+-#define CHOOSE_DYNAMIC_LINKER(G, U, B) \ 
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				+-  CHOOSE_DYNAMIC_LINKER1 ("mglibc", "muclibc", "mbionic", G, U, B) 
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				++#define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ 
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				++  CHOOSE_DYNAMIC_LINKER1 ("mglibc", "muclibc", "mbionic", "mmusl", G, U, B, M) 
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				+ #elif DEFAULT_LIBC == LIBC_UCLIBC 
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				+-#define CHOOSE_DYNAMIC_LINKER(G, U, B) \ 
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				+-  CHOOSE_DYNAMIC_LINKER1 ("muclibc", "mglibc", "mbionic", U, G, B) 
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				++#define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ 
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				++  CHOOSE_DYNAMIC_LINKER1 ("muclibc", "mglibc", "mbionic", "mmusl", U, G, B, M) 
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				+ #elif DEFAULT_LIBC == LIBC_BIONIC 
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				+-#define CHOOSE_DYNAMIC_LINKER(G, U, B) \ 
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				+-  CHOOSE_DYNAMIC_LINKER1 ("mbionic", "mglibc", "muclibc", B, G, U) 
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				++#define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ 
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				++  CHOOSE_DYNAMIC_LINKER1 ("mbionic", "mglibc", "muclibc", "mmusl", B, G, U, M) 
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				++#elif DEFAULT_LIBC == LIBC_MUSL 
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				++#define CHOOSE_DYNAMIC_LINKER(G, U, B, M) \ 
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				++  CHOOSE_DYNAMIC_LINKER1 ("mmusl", "mglibc", "muclibc", "mbionic", M, G, U, B) 
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				+ #else 
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				+ #error "Unsupported DEFAULT_LIBC" 
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				+ #endif /* DEFAULT_LIBC */ 
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				+@@ -84,16 +89,16 @@ see the files COPYING3 and COPYING.RUNTI 
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				+  
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				+ #define GNU_USER_DYNAMIC_LINKER						\ 
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				+   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER,	\ 
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				+-			 BIONIC_DYNAMIC_LINKER) 
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				++			 BIONIC_DYNAMIC_LINKER, MUSL_DYNAMIC_LINKER) 
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				+ #define GNU_USER_DYNAMIC_LINKER32					\ 
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				+   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, \ 
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				+-			 BIONIC_DYNAMIC_LINKER32) 
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				++			 BIONIC_DYNAMIC_LINKER32, MUSL_DYNAMIC_LINKER32) 
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				+ #define GNU_USER_DYNAMIC_LINKER64					\ 
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				+   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, \ 
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				+-			 BIONIC_DYNAMIC_LINKER64) 
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				++			 BIONIC_DYNAMIC_LINKER64, MUSL_DYNAMIC_LINKER64) 
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				+ #define GNU_USER_DYNAMIC_LINKERX32					\ 
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				+   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERX32, UCLIBC_DYNAMIC_LINKERX32, \ 
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				+-			 BIONIC_DYNAMIC_LINKERX32) 
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				++			 BIONIC_DYNAMIC_LINKERX32, MUSL_DYNAMIC_LINKERX32) 
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				+  
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				+ /* Whether we have Bionic libc runtime */ 
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				+ #undef TARGET_HAS_BIONIC 
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				+--- a/gcc/config/linux.opt 
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				++++ b/gcc/config/linux.opt 
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				+@@ -30,3 +30,7 @@ Use GNU C library 
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				+ muclibc 
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				+ Target Report RejectNegative Var(linux_libc,LIBC_UCLIBC) Negative(mbionic) 
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				+ Use uClibc C library 
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				++ 
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				++mmusl 
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				++Target Report RejectNegative Var(linux_libc,LIBC_MUSL) Negative(mglibc) 
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				++Use musl C library 
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				+--- a/gcc/config/mips/linux.h 
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				++++ b/gcc/config/mips/linux.h 
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				+@@ -23,3 +23,5 @@ along with GCC; see the file COPYING3.   
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				+ #undef UCLIBC_DYNAMIC_LINKER 
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				+ #define UCLIBC_DYNAMIC_LINKER \ 
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				+   "%{mnan=2008:/lib/ld-uClibc-mipsn8.so.0;:/lib/ld-uClibc.so.0}" 
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				++ 
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				++#define MUSL_DYNAMIC_LINKER "/lib/ld-musl-mips.so.1" 
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				+--- a/gcc/config/rs6000/linux64.h 
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				++++ b/gcc/config/rs6000/linux64.h 
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				+@@ -375,17 +375,21 @@ extern int dot_symbols; 
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				+ #endif 
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				+ #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0" 
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				+ #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0" 
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				++#define MUSL_DYNAMIC_LINKER32 "/lib/ld-musl-powerpc.so.1" 
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				++#define MUSL_DYNAMIC_LINKER64 "/lib/ld-musl-powerpc64.so.1" 
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				+ #if DEFAULT_LIBC == LIBC_UCLIBC 
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				+-#define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}" 
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				++#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{mglibc:" G ";:%{mmusl:" M ";:" U "}}" 
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				+ #elif DEFAULT_LIBC == LIBC_GLIBC 
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				+-#define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}" 
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				++#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{muclibc:" U ";:%{mmusl:" M ";:" G "}}" 
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				++#elif DEFAULT_LIBC == LIBC_MUSL 
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				++#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{mglibc:" G ";:%{muclibc:" U ";:" M "}}" 
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				+ #else 
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				+ #error "Unsupported DEFAULT_LIBC" 
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				+ #endif 
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				+ #define GNU_USER_DYNAMIC_LINKER32 \ 
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				+-  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32) 
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				++  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, MUSL_DYNAMIC_LINKER32) 
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				+ #define GNU_USER_DYNAMIC_LINKER64 \ 
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				+-  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64) 
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				++  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, MUSL_DYNAMIC_LINKER64) 
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				+  
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				+ #undef  DEFAULT_ASM_ENDIAN 
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				+ #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN) 
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				+--- a/gcc/config/rs6000/sysv4.h 
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				 | 
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				++++ b/gcc/config/rs6000/sysv4.h 
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				 | 
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				+@@ -763,15 +763,18 @@ ENDIAN_SELECT(" -mbig", " -mlittle", DEF 
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				+  
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				+ #define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1" 
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				 | 
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				+ #define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0" 
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				++#define MUSL_DYNAMIC_LINKER "/lib/ld-musl-powerpc.so.1" 
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				 | 
				 | 
			
			
				+ #if DEFAULT_LIBC == LIBC_UCLIBC 
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				 | 
				 | 
			
			
				+-#define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}" 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				++#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{mglibc:" G ";:%{mmusl:" M ";:" U "}}" 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				++#elif DEFAULT_LIBC == LIBC_MUSL 
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				 | 
				 | 
			
			
				++#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{mglibc:" G ";:%{muclibc:" U ";:" M "}}" 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ #elif !defined (DEFAULT_LIBC) || DEFAULT_LIBC == LIBC_GLIBC 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+-#define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}" 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				++#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{muclibc:" U ";:%{mmusl:" M ";:" G "}}" 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ #else 
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				 | 
				 | 
			
			
				+ #error "Unsupported DEFAULT_LIBC" 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ #endif 
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				 | 
				 | 
			
			
				+ #define GNU_USER_DYNAMIC_LINKER \ 
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				 | 
				 | 
			
			
				+-  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				++  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER, MUSL_DYNAMIC_LINKER) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+  
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ #define LINK_OS_LINUX_SPEC "-m elf32ppclinux %{!shared: %{!static: \ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+   %{rdynamic:-export-dynamic} \ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+--- a/gcc/ginclude/stddef.h 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				++++ b/gcc/ginclude/stddef.h 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+@@ -181,6 +181,7 @@ typedef __PTRDIFF_TYPE__ ptrdiff_t; 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ #ifndef _GCC_SIZE_T 
			 | 
		
	
		
			
				 | 
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				+ #ifndef _SIZET_ 
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				+ #ifndef __size_t 
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				++#ifndef __DEFINED_size_t /* musl */ 
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				+ #define __size_t__	/* BeOS */ 
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				+ #define __SIZE_T__	/* Cray Unicos/Mk */ 
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				+ #define _SIZE_T 
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				+@@ -197,6 +198,7 @@ typedef __PTRDIFF_TYPE__ ptrdiff_t; 
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				+ #define ___int_size_t_h 
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				+ #define _GCC_SIZE_T 
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				+ #define _SIZET_ 
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				++#define __DEFINED_size_t /* musl */ 
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				+ #if (defined (__FreeBSD__) && (__FreeBSD__ >= 5)) \ 
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				+   || defined(__FreeBSD_kernel__) 
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				+ /* __size_t is a typedef on FreeBSD 5, must not trash it. */ 
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				+@@ -214,6 +216,7 @@ typedef __SIZE_TYPE__ size_t; 
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				+ typedef long ssize_t; 
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				+ #endif /* __BEOS__ */ 
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				+ #endif /* !(defined (__GNUG__) && defined (size_t)) */ 
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				++#endif /* __DEFINED_size_t */ 
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				+ #endif /* __size_t */ 
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				+ #endif /* _SIZET_ */ 
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				+ #endif /* _GCC_SIZE_T */ 
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				+--- a/libgomp/config/posix/time.c 
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				++++ b/libgomp/config/posix/time.c 
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				+@@ -28,6 +28,8 @@ 
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				+    The following implementation uses the most simple POSIX routines. 
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				+    If present, POSIX 4 clocks should be used instead.  */ 
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				+  
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				++#define _POSIX_C_SOURCE 199309L /* for clocks */ 
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				++ 
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				+ #include "libgomp.h" 
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				+ #include <unistd.h> 
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				+ #if TIME_WITH_SYS_TIME 
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				+--- a/libitm/config/arm/hwcap.cc 
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				++++ b/libitm/config/arm/hwcap.cc 
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				+@@ -40,7 +40,11 @@ int GTM_hwcap HIDDEN = 0 
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				+  
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				+ #ifdef __linux__ 
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				+ #include <unistd.h> 
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				++#ifdef __GLIBC__ 
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				+ #include <sys/fcntl.h> 
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				++#else 
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				++#include <fcntl.h> 
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				++#endif 
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				+ #include <elf.h> 
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				+  
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				+ static void __attribute__((constructor)) 
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				+--- a/libitm/config/linux/x86/tls.h 
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				++++ b/libitm/config/linux/x86/tls.h 
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				+@@ -25,16 +25,19 @@ 
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				+ #ifndef LIBITM_X86_TLS_H 
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				+ #define LIBITM_X86_TLS_H 1 
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				+  
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				+-#if defined(__GLIBC_PREREQ) && __GLIBC_PREREQ(2, 10) 
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				++#if defined(__GLIBC_PREREQ) 
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				++#if __GLIBC_PREREQ(2, 10) 
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				+ /* Use slots in the TCB head rather than __thread lookups. 
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				+    GLIBC has reserved words 10 through 13 for TM.  */ 
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				+ #define HAVE_ARCH_GTM_THREAD 1 
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				+ #define HAVE_ARCH_GTM_THREAD_DISP 1 
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				+ #endif 
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				++#endif 
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				+  
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				+ #include "config/generic/tls.h" 
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				+  
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				+-#if defined(__GLIBC_PREREQ) && __GLIBC_PREREQ(2, 10) 
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				++#if defined(__GLIBC_PREREQ) 
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				++#if __GLIBC_PREREQ(2, 10) 
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				+ namespace GTM HIDDEN { 
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				+  
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				+ #ifdef __x86_64__ 
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				+@@ -101,5 +104,6 @@ static inline void set_abi_disp(struct a 
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				+  
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				+ } // namespace GTM 
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				+ #endif /* >= GLIBC 2.10 */ 
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				++#endif 
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				+  
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				+ #endif // LIBITM_X86_TLS_H 
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				+--- a/libstdc++-v3/configure.host 
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				++++ b/libstdc++-v3/configure.host 
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				+@@ -264,6 +264,13 @@ case "${host_os}" in 
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				+     os_include_dir="os/bsd/freebsd" 
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				+     ;; 
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				+   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu) 
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				++    # check for musl by target 
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				++    case "${host_os}" in 
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				++      *-musl*) 
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				++        os_include_dir="os/generic" 
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				++        ;; 
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				++      *) 
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				++ 
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				+     if [ "$uclibc" = "yes" ]; then 
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				+       os_include_dir="os/uclibc" 
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				+     elif [ "$bionic" = "yes" ]; then 
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				+@@ -272,6 +279,9 @@ case "${host_os}" in 
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				+       os_include_dir="os/gnu-linux" 
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				+     fi 
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				+     ;; 
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				++ 
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				++    esac 
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				++    ;; 
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				+   hpux*) 
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				+     os_include_dir="os/hpux" 
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				+     ;; 
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				+--- a/gcc/config/mips/linux64.h 
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				 | 
				 | 
			
			
				++++ b/gcc/config/mips/linux64.h 
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				+@@ -39,6 +39,9 @@ along with GCC; see the file COPYING3.   
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				 | 
				 | 
			
			
				+   "%{mnan=2008:/lib32/ld-uClibc-mipsn8.so.0;:/lib32/ld-uClibc.so.0}" 
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				 | 
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				+  
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ #define BIONIC_DYNAMIC_LINKERN32 "/system/bin/linker32" 
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				 | 
				 | 
			
			
				++#define MUSL_DYNAMIC_LINKERN32 "/lib/ld-musl-mips.so.1" 
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				 | 
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				++#define MUSL_DYNAMIC_LINKER32 "/lib/ld-musl-mips.so.1" 
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				 | 
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				++#define MUSL_DYNAMIC_LINKER64 "/lib/ld-musl-mips.so.1" 
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				 | 
				 | 
			
			
				+ #define GNU_USER_DYNAMIC_LINKERN32 \ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERN32, UCLIBC_DYNAMIC_LINKERN32, \ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+-			 BIONIC_DYNAMIC_LINKERN32) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				++			 BIONIC_DYNAMIC_LINKERN32, MUSL_DYNAMIC_LINKERN32) 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+--- a/gcc/config/sparc/linux64.h 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				++++ b/gcc/config/sparc/linux64.h 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+@@ -95,6 +95,9 @@ along with GCC; see the file COPYING3.   
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ #define GLIBC_DYNAMIC_LINKER32 "/lib/ld-linux.so.2" 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld-linux.so.2" 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+  
			 | 
		
	
		
			
				 | 
				 | 
			
			
				++#define MUSL_DYNAMIC_LINKER32 "/lib/ld-musl-sparc.so.1" 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				++#define MUSL_DYNAMIC_LINKER64 "/lib/ld-musl-sparc.so.1" 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				++ 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ #ifdef SPARC_BI_ARCH 
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+  
			 | 
		
	
		
			
				 | 
				 | 
			
			
				+ #undef SUBTARGET_EXTRA_SPECS 
			 |