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

[Kenneth Raffenetti]

Hi Jed,

Thanks for reporting this. I don't know the exact history of the 
configure tests, but my "fix" was to make the results consistent across 
our testing platforms. From your email, it appears there is larger issue 
we need to address in order to do what's intended. I'll create a new ticket.

Ken

On 01/08/2014 02:19 PM, "Antonio J. Peña" wrote:
>
> Let me discuss this with Ken. We'll get back to you.
>
>    Antonio
>
>
> On 01/06/2014 06:19 PM, Jed Brown wrote:
>> Jed Brown <jedbrown at mcs.anl.gov> writes:
>>
>>> Pavan Balaji <balaji at mcs.anl.gov> writes:
>>>> This attribute is tested in configure before it’s added to mpi.h.in.
>>> Yes, the configure test is incorrect and the resulting usage in MPICH is
>>> broken (does not do what you intend).
>> As far as I know,
>>
>>    #pragma weak MPI_Xyz = PMPI_Xyz
>>
>> is equivalent to what was intended with the attribute syntax
>>
>>    __attribute__((weak, alias("PMPI_Xyz")))
>>
>> (which belongs in an implementation file, not in the public header).  Is
>> there a reason to bother testing for the attribute syntax?
>
>