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Re: GCC 4.7.2: Mudflap linker errors
bd satish <email@example.com> writes:
> The following piece of code, gives "undefined references" to
> __real_malloc, __real_free, etc.:
> Compiled with:
> g++ -fmudflap references.cc -lmudflap
> /lib64/libmudflap.a(mf-runtime.o): In function `__mfu_check':
> ../libmudflap/mf-runtime.c:912: undefined reference to `__real_malloc'
According to libmudflap/mf-impl.h, since you're using ordinary
archives rather than shared libraries (-fPIC) these __real_FOO
functions are expected to be provided by the linker:
(1) The static method involves a list of -wrap=foo flags being passed to
the linker, which then links references to "foo" to the symbol
"__wrap_foo", and links references to "__real_foo" to the symbol "foo".
When compiled without -DPIC, libmudflap.a contains such __wrap_foo
functions which delegate to __real_foo functions in libc to get their
So, something appears wrong with this wrapping mechanism in your case.
Can you rerun g++ with -v to see how the linker is invoked? Perhaps
there is something missing for the C++ static-linking case.