How do I compile gnu libstdc++.a with PIC?

Question

I'm trying to compile a shared library for systems that don't have a libstdc++ new enough to run it, which means I need to statically link libstdc++ into the library. I'm trying to link directly to libstdc++.a (-Wl,-Bstatic -L/path/to/lib64 -lstdc++), but I'm getting an error that seems to indicate that my libstdc++.a wasn't linked with PIC:

/usr/bin/ld: lib64/libstdc++.a(compatibility.o): relocation R_X86_64_32 against `typeinfo for __cxxabiv1::__forced_unwind' can not be used when making a shared object; recompile with -fPIC
lib64/libstdc++.a: could not read symbols: Bad value

I tried recompiling GCC with CFLAGS="-fPIC" and CXXFLAGS="-fPIC", but that didn't seem to do anything.

Help?

Answer 1

The idea is to pass --with-pic option to the configure. GCC build is a very complex beast with multiple stages, so simply passing a CFLAGS variable may not work as intended.

Answer 2

Reading GCC configure documentation. I used this flag --enable-host-shared when building GCC as it said in the description:

Specify that the host code should be built into position-independent machine code (with -fPIC), allowing it to be used within shared libraries, but yielding a slightly slower compiler.