Re: With and Without gcc OMP

[Nadav Har'El]

On Mon, Sep 24, 2007, Oleg Goldshmidt wrote about "Re: With and Without gcc 
OMP":
> A #pragma is C code just as any other line in your program, so the

This is what I thought too, so there's something that puzzles me in Orna's
original description. She said that she tried something like:

#ifdef _OPENMP
#define OPENMP(line) line
#else
#define OPENMP(line) /* nothing */
#endif

...

OPENMP(#pragma ...)

But it didn't work for her. Do you have any idea why? In the days when
the C preprocessor was separate from the C compiler and ran first, this
SHOULD have worked. Perhaps today the preprocessor is part of the compiler,
and for some reason is not run first but after the openmp processing (whatever
it is)?


> example there uses it to guard a #pragma. Pity. Well, I am offering
> what I consider a hard and fast software engineering rule: all
> #pragmas are non-portable and therefore must be conditionally
> compiled.

Indeed, but I think Orna's question was how to make this the least ugly
as possible. And having half a dozen lines of "#" lines before every function
is certainly quite ugly, if there was a possibility to have only one.


-- 
Nadav Har'El                        |     Tuesday, Sep 25 2007, 13 Tishri 5768
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