gcc-4.7: Add recipes

Add new recipes for gcc-4_7-branch right now gcc 4.7.0
is latest release from this branch

(From OE-Core rev: 3f8fee75e598ad0994acc5da0a612e6eca4f35f6)

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

meta/recipes-devtools/gcc/gcc-4.7/optional_libstdc.patch

@@ -0,0 +1,86 @@
+Upstream-Status: Inappropriate [embedded specific]
+
+gcc-runtime builds libstdc++ separately from gcc-cross-*. Its configure tests using g++ 
+will not run correctly since by default the linker will try to link against libstdc++
+which shouldn't exist yet. We need an option to disable -lstdc++
+option whilst leaving -lc, -lgcc and other automatic library dependencies added by gcc 
+driver. This patch adds such an option which only disables the -lstdc++.
+
+A "standard" gcc build uses xgcc and hence avoids this. We should ask upstream how to 
+do this officially, the likely answer is don't build libstdc++ separately.
+
+RP 29/6/10
+
+Index: gcc-4_7-branch/gcc/cp/g++spec.c
+===================================================================
+--- gcc-4_7-branch.orig/gcc/cp/g++spec.c	2012-04-10 10:17:24.647330074 -0700
++++ gcc-4_7-branch/gcc/cp/g++spec.c	2012-04-10 10:37:49.479389235 -0700
+@@ -127,6 +127,7 @@
+       switch (decoded_options[i].opt_index)
+ 	{
+ 	case OPT_nostdlib:
++	case OPT_nostdlib__:
+ 	case OPT_nodefaultlibs:
+ 	  library = -1;
+ 	  break;
+Index: gcc-4_7-branch/gcc/doc/invoke.texi
+===================================================================
+--- gcc-4_7-branch.orig/gcc/doc/invoke.texi	2012-04-10 10:37:09.343387385 -0700
++++ gcc-4_7-branch/gcc/doc/invoke.texi	2012-04-10 10:37:49.483389340 -0700
+@@ -194,7 +194,7 @@
+ -fno-pretty-templates @gol
+ -frepo  -fno-rtti  -fstats  -ftemplate-depth=@var{n} @gol
+ -fno-threadsafe-statics -fuse-cxa-atexit  -fno-weak  -nostdinc++ @gol
+--fno-default-inline  -fvisibility-inlines-hidden @gol
++-nostdlib++ -fno-default-inline  -fvisibility-inlines-hidden @gol
+ -fvisibility-ms-compat @gol
+ -Wabi  -Wconversion-null  -Wctor-dtor-privacy @gol
+ -Wdelete-non-virtual-dtor -Wnarrowing -Wnoexcept @gol
+@@ -445,7 +445,7 @@
+ @gccoptlist{@var{object-file-name}  -l@var{library} @gol
+ -nostartfiles  -nodefaultlibs  -nostdlib -pie -rdynamic @gol
+ -s  -static  -static-libgcc  -static-libstdc++ -shared  @gol
+--shared-libgcc  -symbolic @gol
++-shared-libgcc  -symbolic -nostdlib++ @gol
+ -T @var{script}  -Wl,@var{option}  -Xlinker @var{option} @gol
+ -u @var{symbol}}
+ 
+@@ -9438,6 +9438,11 @@
+ libc.  These entry points should be supplied through some other
+ mechanism when this option is specified.
+ 
++@item -nostdlib++
++@opindex nostdlib++
++Do not use the standard system C++ runtime libraries when linking.
++Only the libraries you specify will be passed to the linker.
++
+ @cindex @option{-lgcc}, use with @option{-nostdlib}
+ @cindex @option{-nostdlib} and unresolved references
+ @cindex unresolved references and @option{-nostdlib}
+Index: gcc-4_7-branch/gcc/c-family/c.opt
+===================================================================
+--- gcc-4_7-branch.orig/gcc/c-family/c.opt	2012-04-10 10:17:24.667330076 -0700
++++ gcc-4_7-branch/gcc/c-family/c.opt	2012-04-10 10:37:49.483389340 -0700
+@@ -1171,6 +1171,10 @@
+ C++ ObjC++
+ Do not search standard system include directories for C++
+ 
++nostdlib++
++Driver
++Do not link standard C++ runtime library
++
+ o
+ C ObjC C++ ObjC++ Joined Separate
+ ; Documented in common.opt
+Index: gcc-4_7-branch/gcc/gcc.c
+===================================================================
+--- gcc-4_7-branch.orig/gcc/gcc.c	2012-04-10 10:37:09.343387385 -0700
++++ gcc-4_7-branch/gcc/gcc.c	2012-04-10 10:37:49.487389409 -0700
+@@ -681,6 +681,7 @@
+     %(mflib) " STACK_SPLIT_SPEC "\
+     %{fprofile-arcs|fprofile-generate*|coverage:-lgcov}\
+     %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %(link_gcc_c_sequence)}}\
++    %{!nostdlib++:}\
+     %{!nostdlib:%{!nostartfiles:%E}} %{T*} }}}}}}"
+ #endif
+