[Mpi-forum] Preprocessor Constants
nmm1 at cam.ac.uk
Tue Nov 23 03:52:42 CST 2010
On Nov 23 2010, Hal Finkel wrote:
>> As noted in New Orleans, you have a bit of a challenge with this idea
>> in that some vendor MPI implementations do not use wrapper compilers,
>> and therefore may have some difficulty in providing this macro. ...
Boggle. Not that all don't use wrapper compilers - I know that - but
that they might have difficulty.
>My personal experience is limited to two kinds of MPI implementations:
> 1. An implementation which provides wrapper scripts (i.e. mpicc). These
> scripts could easily add -D_MPI would prevent the conforming use of
> POSIX! See:
2.2 The Compilation Environment
2.2.1 POSIX.1 Symbols
>2. An implementation which simply documents the flags necessary for
>compiling and linking. ...
Add: 3. An implementation that uses a pre-processor.
In all cases, adding such a macro is trivial. While it is certainly
possible to imaging a C environment that can add headers but not macros,
it's implausible, to put it mildly.
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