[mpich-devel] Weak symbols, clang, and users compiling with -fvisibility=hidden

[Jed Brown]

Jed Brown <jedbrown at mcs.anl.gov> writes:
> So in summary, we can't have __attribute__((weak,alias("PMPI_..."))) in
> the header because:
>
>   1. it does not compile with gcc

It also does not compile with the new version of clang.

conftest.c:37:34: error: alias must point to a defined variable or function
int foo(void) __attribute((weak, alias("__foo")));
                                 ^

>   2. it breaks PMPI interposition with clang
>   3. it breaks -fvisibility=hidden with clang

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