# HG changeset patch
# Parent 6738fd6f6fcc2a72f2ba527bda3325642af26885
Support for arm-linux-musl.
Upstream-Status: Backport [partial]
Signed-off-by: Khem Raj <raj.khem@gmail.com>


Index: gcc-4.9.2/gcc/config/arm/linux-eabi.h
===================================================================
--- gcc-4.9.2.orig/gcc/config/arm/linux-eabi.h
+++ gcc-4.9.2/gcc/config/arm/linux-eabi.h
@@ -81,6 +81,23 @@
 #undef TARGET_FIX_V4BX_SPEC
 #define TARGET_FIX_V4BX_SPEC "%{mcpu=arm8|mcpu=arm810|mcpu=strongarm*|march=armv4: --fix-v4bx}"
 
+/* For ARM musl currently supports four dynamic linkers:
+   - ld-musl-arm.so.1 - for the EABI-derived soft-float ABI
+   - ld-musl-armhf.so.1 - for the EABI-derived hard-float ABI
+   - ld-musl-armeb.so.1 - for the EABI-derived soft-float ABI, EB
+   - ld-musl-armebhf.so.1 - for the EABI-derived hard-float ABI, EB
+   musl does not support the legacy OABI mode.
+   All the dynamic linkers live in /lib.
+   We default to soft-float, EL. */
+#undef  MUSL_DYNAMIC_LINKER
+#if TARGET_BIG_ENDIAN_DEFAULT
+#define MUSL_DYNAMIC_LINKER_E "%{mlittle-endian:;:eb}"
+#else
+#define MUSL_DYNAMIC_LINKER_E "%{mbig-endian:eb}"
+#endif
+#define MUSL_DYNAMIC_LINKER \
+  SYSTEMLIBS_DIR "ld-musl-arm" MUSL_DYNAMIC_LINKER_E "%{mfloat-abi=hard:hf}.so.1"
+
 /* At this point, bpabi.h will have clobbered LINK_SPEC.  We want to
    use the GNU/Linux version, not the generic BPABI version.  */
 #undef  LINK_SPEC
Index: gcc-4.9.2/libitm/config/arm/hwcap.cc
===================================================================
--- gcc-4.9.2.orig/libitm/config/arm/hwcap.cc
+++ gcc-4.9.2/libitm/config/arm/hwcap.cc
@@ -40,7 +40,11 @@ int GTM_hwcap HIDDEN = 0
 
 #ifdef __linux__
 #include <unistd.h>
+#ifdef __GLIBC__
 #include <sys/fcntl.h>
+#else
+#include <fcntl.h>
+#endif
 #include <elf.h>
 
 static void __attribute__((constructor))
Index: gcc-4.9.2/gcc/config/i386/linux.h
===================================================================
--- gcc-4.9.2.orig/gcc/config/i386/linux.h
+++ gcc-4.9.2/gcc/config/i386/linux.h
@@ -21,3 +21,4 @@ along with GCC; see the file COPYING3.
 
 #define GNU_USER_LINK_EMULATION "elf_i386"
 #define GLIBC_DYNAMIC_LINKER SYSTEMLIBS_DIR "ld-linux.so.2"
+#define MUSL_DYNAMIC_LINKER SYSTEMLIBS_DIR "ld-musl-i386.so.1"
Index: gcc-4.9.2/gcc/config/i386/linux64.h
===================================================================
--- gcc-4.9.2.orig/gcc/config/i386/linux64.h
+++ gcc-4.9.2/gcc/config/i386/linux64.h
@@ -30,3 +30,8 @@ see the files COPYING3 and COPYING.RUNTI
 #define GLIBC_DYNAMIC_LINKER32 SYSTEMLIBS_DIR "ld-linux.so.2"
 #define GLIBC_DYNAMIC_LINKER64 SYSTEMLIBS_DIR "ld-linux-x86-64.so.2"
 #define GLIBC_DYNAMIC_LINKERX32 SYSTEMLIBS_DIR "ld-linux-x32.so.2"
+
+#define MUSL_DYNAMIC_LINKER32 SYSTEMLIBS_DIR "ld-musl-i386.so.1"
+#define MUSL_DYNAMIC_LINKER64 SYSTEMLIBS_DIR "ld-musl-x86_64.so.1"
+#define MUSL_DYNAMIC_LINKERX32 SYSTEMLIBS_DIR "ld-musl-x32.so.1"
+
Index: gcc-4.9.2/gcc/config/mips/linux.h
===================================================================
--- gcc-4.9.2.orig/gcc/config/mips/linux.h
+++ gcc-4.9.2/gcc/config/mips/linux.h
@@ -23,3 +23,6 @@ along with GCC; see the file COPYING3.
 #undef UCLIBC_DYNAMIC_LINKER
 #define UCLIBC_DYNAMIC_LINKER \
   "%{mnan=2008:" SYSTEMLIBS_DIR "ld-uClibc-mipsn8.so.0;:" SYSTEMLIBS_DIR "ld-uClibc.so.0}"
+
+#define MUSL_DYNAMIC_LINKER SYSTEMLIBS_DIR "ld-musl-mips.so.1"
+
Index: gcc-4.9.2/gcc/config/mips/linux64.h
===================================================================
--- gcc-4.9.2.orig/gcc/config/mips/linux64.h
+++ gcc-4.9.2/gcc/config/mips/linux64.h
@@ -39,6 +39,11 @@ along with GCC; see the file COPYING3.
   "%{mnan=2008:" SYSTEMLIBS_DIR "ld-uClibc-mipsn8.so.0;:" SYSTEMLIBS_DIR "ld-uClibc.so.0}"
 
 #define BIONIC_DYNAMIC_LINKERN32 "/system/bin/linker32"
+
+#define MUSL_DYNAMIC_LINKERN32 SYSTEMLIBS_DIR "ld-musl-mips.so.1"
+#define MUSL_DYNAMIC_LINKER32 SYSTEMLIBS_DIR "ld-musl-mips.so.1"
+#define MUSL_DYNAMIC_LINKER64 SYSTEMLIBS_DIR "ld-musl-mips.so.1"
+
 #define GNU_USER_DYNAMIC_LINKERN32 \
   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERN32, UCLIBC_DYNAMIC_LINKERN32, \
-			 BIONIC_DYNAMIC_LINKERN32)
+			 BIONIC_DYNAMIC_LINKERN32, MUSL_DYNAMIC_LINKERN32)
Index: gcc-4.9.2/gcc/config/rs6000/linux64.h
===================================================================
--- gcc-4.9.2.orig/gcc/config/rs6000/linux64.h
+++ gcc-4.9.2/gcc/config/rs6000/linux64.h
@@ -375,17 +375,22 @@ extern int dot_symbols;
 #endif
 #define UCLIBC_DYNAMIC_LINKER32 SYSTEMLIBS_DIR "ld-uClibc.so.0"
 #define UCLIBC_DYNAMIC_LINKER64 SYSTEMLIBS_DIR "ld64-uClibc.so.0"
+#define MUSL_DYNAMIC_LINKER32 SYSTEMLIBS_DIR "ld-musl-powerpc.so.1"
+#define MUSL_DYNAMIC_LINKER64 SYSTEMLIBS_DIR "ld-musl-powerpc64.so.1"
+
 #if DEFAULT_LIBC == LIBC_UCLIBC
-#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_GLIBC
-#define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
+#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{muclibc:" U ";:%{mmusl:" M ";:" G "}}"
+#elif DEFAULT_LIBC == LIBC_MUSL
+#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{mglibc:" G ";:%{muclibc:" U ";:" M "}}"
 #else
 #error "Unsupported DEFAULT_LIBC"
 #endif
 #define GNU_USER_DYNAMIC_LINKER32 \
-  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
+  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, MUSL_DYNAMIC_LINKER32)
 #define GNU_USER_DYNAMIC_LINKER64 \
-  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
+  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, MUSL_DYNAMIC_LINKER64)
 
 #undef  DEFAULT_ASM_ENDIAN
 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
Index: gcc-4.9.2/gcc/config/rs6000/sysv4.h
===================================================================
--- gcc-4.9.2.orig/gcc/config/rs6000/sysv4.h
+++ gcc-4.9.2/gcc/config/rs6000/sysv4.h
@@ -768,15 +768,19 @@ ENDIAN_SELECT(" -mbig", " -mlittle", DEF
 
 #define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1"
 #define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0"
+#define MUSL_DYNAMIC_LINKER "/lib/ld-musl-powerpc.so.1"
+
 #if DEFAULT_LIBC == LIBC_UCLIBC
-#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
+#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
 #error "Unsupported DEFAULT_LIBC"
 #endif
 #define GNU_USER_DYNAMIC_LINKER \
-  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} \
Index: gcc-4.9.2/libitm/config/linux/x86/tls.h
===================================================================
--- gcc-4.9.2.orig/libitm/config/linux/x86/tls.h
+++ gcc-4.9.2/libitm/config/linux/x86/tls.h
@@ -25,16 +25,19 @@
 #ifndef LIBITM_X86_TLS_H
 #define LIBITM_X86_TLS_H 1
 
-#if defined(__GLIBC_PREREQ) && __GLIBC_PREREQ(2, 10)
+#if defined(__GLIBC_PREREQ)
+#if __GLIBC_PREREQ(2, 10)
 /* Use slots in the TCB head rather than __thread lookups.
    GLIBC has reserved words 10 through 13 for TM.  */
 #define HAVE_ARCH_GTM_THREAD 1
 #define HAVE_ARCH_GTM_THREAD_DISP 1
 #endif
+#endif
 
 #include "config/generic/tls.h"
 
-#if defined(__GLIBC_PREREQ) && __GLIBC_PREREQ(2, 10)
+#if defined(__GLIBC_PREREQ)
+#if __GLIBC_PREREQ(2, 10)
 namespace GTM HIDDEN {
 
 #ifdef __x86_64__
@@ -101,5 +104,6 @@ static inline void set_abi_disp(struct a
 
 } // namespace GTM
 #endif /* >= GLIBC 2.10 */
+#endif
 
 #endif // LIBITM_X86_TLS_H
Index: gcc-4.9.2/gcc/config/aarch64/aarch64-linux.h
===================================================================
--- gcc-4.9.2.orig/gcc/config/aarch64/aarch64-linux.h
+++ gcc-4.9.2/gcc/config/aarch64/aarch64-linux.h
@@ -25,6 +25,8 @@
 
 #define CPP_SPEC "%{pthread:-D_REENTRANT}"
 
+#define MUSL_DYNAMIC_LINKER SYSTEMLIBS_DIR "ld-musl-aarch64.so.1"
+
 #define LINUX_TARGET_LINK_SPEC  "%{h*}		\
    %{static:-Bstatic}				\
    %{shared:-shared}				\