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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