Hi,
This came up in a User question last night and reminded me that I had a patch
for it in my Q.
----
Usually g++ driver support for -static-libstdc++ is provided by "-Bstatic
-lstdc++ -Bdynamic" and is currently disabled for targets without that linker
support. However, actually, there is still an opportunity for those targets to
implement the functionality with a spec substituation like:
%{static-libstdc++:%:replace-outfile(-lstdc++ libstdc++.a%s)}
However, this doesn't currently work because the g++ driver swallows
"-static-libstdc++" so it's never seen by the specs.
The patch below pushes -static-libstdc++ onto the output command line (for
targets without -Bstatic/dynamic) so that such specs have an opportunity to
fire.
OK for trunk?
Iain
gcc/cp:
* g++spec.c (lang_specific_driver): Push "-static-libstdc++" back to
the output
command line when the target linker does not support -Bstatic/dynamic
so that it
is available for spec substitions to act on.
---
gcc/cp/g++spec.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/gcc/cp/g++spec.c b/gcc/cp/g++spec.c
index 6536d7e..48a9708 100644
--- a/gcc/cp/g++spec.c
+++ b/gcc/cp/g++spec.c
@@ -363,6 +363,15 @@ lang_specific_driver (struct cl_decoded_option
**in_decoded_options,
&new_decoded_options[j]);
j++;
}
+#else
+ /* For linkers that don't support Bstatic/dynamic push the flag back
+ so that spec substitution can see it. */
+ if (library > 1 && !static_link)
+ {
+ generate_option (OPT_static_libstdc__, NULL, 0, CL_DRIVER,
+ &new_decoded_options[j]);
+ j++;
+ }
#endif
}
if (saw_math)
--
2.2.1
