Hi, the google/gcc-4_7 fails to linking anything (on x86-generic), by
looking into specs file, it seems that 'link_emulation' section is
missing in specs.
The problem is in config/i386/linux.h, SUBTARGET_EXTRA_SPECS (which is
not empty for chrome x86-generic) is overridden by
"LINUX_GRTE_EXTRA_SPECS".
My fix is to prepend LINUX_GRTE_EXTRA_SPECS to SUBTARGET_EXTRA_SPECS in linux.h
Jing, could you take a look at this?
--
Han Shen
2012-08-13 Han Shen <shen...@google.com>
* gcc/config/i386/gnu-user.h (SUBTARGET_EXTRA_SPECS): Compute
new value of LINUX_GRTE_EXTRA_SPECS by pre-pending LINUX_GRTE_EXTRA_SPECS
to its origin value.
* gcc/config/i386/gnu-user.h (SUBTARGET_EXTRA_SPECS_STR): Add
new MACRO to hold value of SUBTARET_EXTRA_SPECS so that
SUBTARET_EXTRA_SPECS could be replaced later in gnu-user.h
--- a/gcc/config/i386/gnu-user.h
+++ b/gcc/config/i386/gnu-user.h
@@ -92,11 +92,14 @@ along with GCC; see the file COPYING3. If not see
#define ASM_SPEC \
"--32 %{!mno-sse2avx:%{mavx:-msse2avx}} %{msse2avx:%{!mavx:-msse2avx}}"
-#undef SUBTARGET_EXTRA_SPECS
-#define SUBTARGET_EXTRA_SPECS \
+#undef SUBTARGET_EXTRA_SPECS_STR
+#define SUBTARGET_EXTRA_SPECS_STR \
{ "link_emulation", GNU_USER_LINK_EMULATION },\
{ "dynamic_linker", GNU_USER_DYNAMIC_LINKER }
+#undef SUBTARGET_EXTRA_SPECS
+#define SUBTARGET_EXTRA_SPECS SUBTARGET_EXTRA_SPECS_STR
+
#undef LINK_SPEC
#define LINK_SPEC "-m %(link_emulation) %{shared:-shared} \
%{!shared: \
--- a/gcc/config/i386/linux.h
+++ b/gcc/config/i386/linux.h
@@ -32,5 +32,11 @@ along with GCC; see the file COPYING3. If not see
#endif
#undef SUBTARGET_EXTRA_SPECS
+#ifndef SUBTARGET_EXTRA_SPECS_STR
#define SUBTARGET_EXTRA_SPECS \
LINUX_GRTE_EXTRA_SPECS
+#else
+#define SUBTARGET_EXTRA_SPECS \
+ LINUX_GRTE_EXTRA_SPECS \
+ SUBTARGET_EXTRA_SPECS_STR
+#endif
