Add new gcc packages that build syslibs.

* Build shared and static syslibs packages along with gcc. These
  packages will be used by Haiku's build system.

sys-devel/gcc/patches/gcc-4.8.3_buildfixes_for_x86_64.patchset

@@ -0,0 +1,95 @@
+From e9e78f55996c23624ebd792eed57dd60a571daaa Mon Sep 17 00:00:00 2001
+From: Jessica Hamilton <jessica.l.hamilton@gmail.com>
+Date: Tue, 22 Jul 2014 01:32:29 +0000
+Subject: Specify -save-temps for libgcc during dependency phase
+
+This works around an internal compiler error when building
+gcc for x86_64 with thread local storage enabled.
+
+diff --git a/libcpp/Makefile.in b/libcpp/Makefile.in
+index 2353c9c..93eada2 100644
+--- a/libcpp/Makefile.in
++++ b/libcpp/Makefile.in
+@@ -207,7 +207,7 @@ ifeq ($(DEPMODE),depmode=gcc3)
+ # Note that we put the dependencies into a .Tpo file, then move them
+ # into place if the compile succeeds.  We need this because gcc does
+ # not atomically write the dependency output file.
+-COMPILE = $(COMPILE.base) -o $@ -MT $@ -MMD -MP -MF $(DEPDIR)/$*.Tpo
++COMPILE = $(COMPILE.base) -o $@ -save-temps -MT $@ -MMD -MP -MF $(DEPDIR)/$*.Tpo
+ POSTCOMPILE = @mv $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+ else
+ COMPILE = source='$<' object='$@' libtool=no DEPDIR=$(DEPDIR) $(DEPMODE) \
+-- 
+1.8.3.4
+
+From fc3eb46b47136ae82418e2a6f63f3e3d8e918c1f Mon Sep 17 00:00:00 2001
+From: Oliver Tappe <zooey@hirschkaefer.de>
+Date: Sat, 26 Jul 2014 13:19:29 +0200
+Subject: Circumvent build problems on x86_64.
+
+* Due to some yet unknown cause, --as-needed does not seem to work as
+  expected on x86_64, which causes the gcc build to fail when it checks
+  if it can execute built programs (as libgcc_s.so is needed by those
+  programs and can't be found). Circumvent the problem for now by creating
+  appropriate 'lib' symlinks such that libgcc_s.so will be found by
+  runtime_loader.
+
+diff --git a/gmp/configure b/gmp/configure
+index e8378cc..68c8d69 100755
+--- a/gmp/configure
++++ b/gmp/configure
+@@ -9378,7 +9378,8 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+     ;;
+ esac
+ 
+-
++# create lib symlink such that the runtime loader will find libgcc_s.so
++ln -sfn ../prev-gcc lib
+ 
+ # The C compiler on the build system, and associated tests.
+ 
+diff --git a/libquadmath/configure b/libquadmath/configure
+index 76dfbdf..e58cf46 100755
+--- a/libquadmath/configure
++++ b/libquadmath/configure
+@@ -3381,6 +3381,9 @@ See \`config.log' for more details." "$LINENO" 5; }; }
+ fi
+ ac_exeext=$ac_cv_exeext
+ 
++# create lib symlink such that the runtime loader will find libgcc_s.so
++ln -sfn ../../gcc/ lib
++
+ # Check that the compiler produces executables we can run.  If not, either
+ # the compiler is broken, or we cross compile.
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the C compiler works" >&5
+diff --git a/libssp/configure b/libssp/configure
+index c42affe..20e2b87 100755
+--- a/libssp/configure
++++ b/libssp/configure
+@@ -3361,6 +3361,9 @@ See \`config.log' for more details." "$LINENO" 5; }; }
+ fi
+ ac_exeext=$ac_cv_exeext
+ 
++# create lib symlink such that the runtime loader will find libgcc_s.so
++ln -sfn ../../gcc/ lib
++
+ # Check that the compiler produces executables we can run.  If not, either
+ # the compiler is broken, or we cross compile.
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the C compiler works" >&5
+diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
+index 6479114..72e04bd 100755
+--- a/libstdc++-v3/configure
++++ b/libstdc++-v3/configure
+@@ -3997,6 +3997,9 @@ See \`config.log' for more details." "$LINENO" 5; }; }
+ fi
+ ac_exeext=$ac_cv_exeext
+ 
++# create lib symlink such that the runtime loader will find libgcc_s.so
++ln -sfn ../../gcc/ lib
++
+ # Check that the compiler produces executables we can run.  If not, either
+ # the compiler is broken, or we cross compile.
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the C compiler works" >&5
+-- 
+1.8.3.4
+