[OMPI users] gcc 5 compiler does not like variable argument functions -> config fails when checking for ISO C99 ability

[Platzer, Peter]

I’ve posted the details here on StackOverflow as well, including how to 
reproduce. 
http://stackoverflow.com/questions/34457801/error-with-gcc-5-for-varargs-function-suffix-or-operands-invalid-for-movq

Environment: Mac OS El Capitan
OpenMPI 1.10
GCC 5.3

configure fails when checking for ISO C99 compatibility. I traced it down to 
gcc 5 not compiling variable argument functions.

This problem does not exist when using gcc 4.9


Cheers,

Peter
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Peter Platzer (HBS)
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