gcc: port missing patches from 4.6 to 4.8

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 36693

toolchain/gcc/patches/4.8-linaro/850-use_shared_libgcc.patch

@@ -0,0 +1,58 @@
+--- a/gcc/config/arm/linux-eabi.h
++++ b/gcc/config/arm/linux-eabi.h
+@@ -114,10 +114,6 @@
+ #define ENDFILE_SPEC \
+   LINUX_OR_ANDROID_LD (GNU_USER_TARGET_ENDFILE_SPEC, ANDROID_ENDFILE_SPEC)
+ 
+-/* Use the default LIBGCC_SPEC, not the version in linux-elf.h, as we
+-   do not use -lfloat.  */
+-#undef LIBGCC_SPEC
+-
+ /* Clear the instruction cache from `beg' to `end'.  This is
+    implemented in lib1funcs.S, so ensure an error if this definition
+    is used.  */
+--- a/gcc/config/linux.h
++++ b/gcc/config/linux.h
+@@ -51,6 +51,10 @@ see the files COPYING3 and COPYING.RUNTI
+ 	builtin_assert ("system=posix");			\
+     } while (0)
+ 
++#ifndef LIBGCC_SPEC
++#define LIBGCC_SPEC "%{static|static-libgcc:-lgcc}%{!static:%{!static-libgcc:-lgcc_s}}"
++#endif
++
+ /* 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.  */
+--- a/libgcc/mkmap-symver.awk
++++ b/libgcc/mkmap-symver.awk
+@@ -132,5 +132,5 @@ function output(lib) {
+   else if (inherit[lib])
+     printf("} %s;\n", inherit[lib]);
+   else
+-    printf ("\n  local:\n\t*;\n};\n");
++    printf ("\n\t*;\n};\n");
+ }
+--- a/libgcc/Makefile.in
++++ b/libgcc/Makefile.in
+@@ -368,7 +368,7 @@ endif
+ # For -fvisibility=hidden.  We need both a -fvisibility=hidden on
+ # the command line, and a #define to prevent libgcc2.h etc from
+ # overriding that with #pragmas.
+-vis_hide = @vis_hide@
++vis_hide =
+ 
+ ifneq (,$(vis_hide))
+ 
+--- a/gcc/config/rs6000/linux.h
++++ b/gcc/config/rs6000/linux.h
+@@ -61,6 +61,9 @@
+ #undef  CPLUSPLUS_CPP_SPEC
+ #define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
+ 
++#undef LIBGCC_SPEC
++#define LIBGCC_SPEC "%{!static:%{!static-libgcc:-lgcc_s}} -lgcc"
++
+ #undef  LINK_SHLIB_SPEC
+ #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
+