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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
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