gcc: musl related fixes for ppc/secure-plt and gthr

These issues are fixing building gcc for target, ppc issue
helps in fixing discrepency between gcc cmdline and linker cmdline

(From OE-Core rev: 6af50d8865335aed68fb4f9b319edb81ce93a04e)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gcc/gcc-5.3.inc

@@ -78,6 +78,8 @@ SRC_URI = "\
            file://0046-Get-rid-of-ever-broken-fixincludes-on-musl.patch \
            file://0047-nios2-Define-MUSL_DYNAMIC_LINKER.patch \
            file://0048-ssp_nonshared.patch \
+           file://0049-Disable-the-weak-reference-logic-in-gthr.h-for-os-ge.patch \
+           file://0050-powerpc-pass-secure-plt-to-the-linker.patch \
           "
 
 BACKPORTS = ""

meta/recipes-devtools/gcc/gcc-5.3/0049-Disable-the-weak-reference-logic-in-gthr.h-for-os-ge.patch

@@ -0,0 +1,78 @@
+From 553d8e3b9073ff3e0a9d2fac9b1823fb17ad247c Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Tue, 2 Feb 2016 21:00:18 -0800
+Subject: [PATCH 49/51] Disable the weak reference logic in gthr.h for
+ os/generic
+
+It does not work unless work arounds are there in gthr-posix.h
+
+origin of patch
+http://port70.net/~nsz/musl/gcc-5.3.0/0004-gthr.patch
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Pending
+
+ libgfortran/acinclude.m4                    | 2 +-
+ libgfortran/configure                       | 2 +-
+ libstdc++-v3/config/os/generic/os_defines.h | 5 +++++
+ libstdc++-v3/configure.host                 | 3 +++
+ 4 files changed, 10 insertions(+), 2 deletions(-)
+
+diff --git a/libgfortran/acinclude.m4 b/libgfortran/acinclude.m4
+index ba890f9..30b8b1a6 100644
+--- a/libgfortran/acinclude.m4
++++ b/libgfortran/acinclude.m4
+@@ -100,7 +100,7 @@ void foo (void);
+ 	      [Define to 1 if the target supports #pragma weak])
+   fi
+   case "$host" in
+-    *-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* )
++    *-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* | *-*-musl* )
+       AC_DEFINE(GTHREAD_USE_WEAK, 0,
+ 		[Define to 0 if the target shouldn't use #pragma weak])
+       ;;
+diff --git a/libgfortran/configure b/libgfortran/configure
+index 5d47e65..cdf9695 100755
+--- a/libgfortran/configure
++++ b/libgfortran/configure
+@@ -26456,7 +26456,7 @@ $as_echo "#define SUPPORTS_WEAK 1" >>confdefs.h
+ 
+   fi
+   case "$host" in
+-    *-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* )
++    *-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* | *-*-musl* )
+ 
+ $as_echo "#define GTHREAD_USE_WEAK 0" >>confdefs.h
+ 
+diff --git a/libstdc++-v3/config/os/generic/os_defines.h b/libstdc++-v3/config/os/generic/os_defines.h
+index 45bf52a..103ec0e 100644
+--- a/libstdc++-v3/config/os/generic/os_defines.h
++++ b/libstdc++-v3/config/os/generic/os_defines.h
+@@ -33,4 +33,9 @@
+ // System-specific #define, typedefs, corrections, etc, go here.  This
+ // file will come before all others.
+ 
++// Disable the weak reference logic in gthr.h for os/generic because it
++// is broken on every platform unless there is implementation specific
++// workaround in gthr-posix.h and at link-time for static linking.
++#define _GLIBCXX_GTHREAD_USE_WEAK 0
++
+ #endif
+diff --git a/libstdc++-v3/configure.host b/libstdc++-v3/configure.host
+index 1756444..2a87bb8 100644
+--- a/libstdc++-v3/configure.host
++++ b/libstdc++-v3/configure.host
+@@ -273,6 +273,9 @@ case "${host_os}" in
+   freebsd*)
+     os_include_dir="os/bsd/freebsd"
+     ;;
++  linux-musl*)
++    os_include_dir="os/generic"
++    ;;
+   gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
+     # check for musl by target
+     case "${host_os}" in
+-- 
+2.7.0
+

meta/recipes-devtools/gcc/gcc-5.3/0050-powerpc-pass-secure-plt-to-the-linker.patch

@@ -0,0 +1,66 @@
+From 4fa0cf03678f849917dcc3d149989b7fecdbe276 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Tue, 2 Feb 2016 21:10:00 -0800
+Subject: [PATCH 50/51] powerpc pass --secure-plt to the linker
+
+Secure-plt when enabled does not pass right options to linker
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Pending
+ gcc/config/rs6000/linux64.h | 4 ++++
+ gcc/config/rs6000/sysv4.h   | 2 ++
+ 2 files changed, 6 insertions(+)
+
+diff --git a/gcc/config/rs6000/linux64.h b/gcc/config/rs6000/linux64.h
+index 679da4b..3ca7cd7 100644
+--- a/gcc/config/rs6000/linux64.h
++++ b/gcc/config/rs6000/linux64.h
+@@ -174,20 +174,24 @@ extern int dot_symbols;
+ #undef	ASM_DEFAULT_SPEC
+ #undef	ASM_SPEC
+ #undef	LINK_OS_LINUX_SPEC
++#undef	LINK_SECURE_PLT_SPEC
+ 
+ #ifndef	RS6000_BI_ARCH
+ #define	ASM_DEFAULT_SPEC "-mppc64"
+ #define	ASM_SPEC	 "%(asm_spec64) %(asm_spec_common)"
+ #define	LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
++#define	LINK_SECURE_PLT_SPEC ""
+ #else
+ #if DEFAULT_ARCH64_P
+ #define	ASM_DEFAULT_SPEC "-mppc%{!m32:64}"
+ #define	ASM_SPEC	 "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
+ #define	LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
++#define	LINK_SECURE_PLT_SPEC "%{m32: " LINK_SECURE_PLT_DEFAULT_SPEC "}"
+ #else
+ #define	ASM_DEFAULT_SPEC "-mppc%{m64:64}"
+ #define	ASM_SPEC	 "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
+ #define	LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
++#define	LINK_SECURE_PLT_SPEC "%{!m64: " LINK_SECURE_PLT_DEFAULT_SPEC "}"
+ #endif
+ #endif
+ 
+diff --git a/gcc/config/rs6000/sysv4.h b/gcc/config/rs6000/sysv4.h
+index 8794fa5..0835551 100644
+--- a/gcc/config/rs6000/sysv4.h
++++ b/gcc/config/rs6000/sysv4.h
+@@ -571,6 +571,7 @@ ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
+                : %(link_start_default)     }"
+ 
+ #define LINK_START_DEFAULT_SPEC ""
++#define LINK_SECURE_PLT_SPEC LINK_SECURE_PLT_DEFAULT_SPEC
+ 
+ #undef	LINK_SPEC
+ #define	LINK_SPEC "\
+@@ -578,6 +579,7 @@ ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
+ %{R*} \
+ %(link_shlib) \
+ %{!T*: %(link_start) } \
++%{!static: %{!mbss-plt: %(link_secure_plt_default)}} \
+ %(link_os)"
+ 
+ /* Shared libraries are not default.  */
+-- 
+2.7.0
+