Detect which target CPU a GCC configured for?

Question

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Detecting CPU architecture compile-time

Is there a define that GCC sets which tells which CPU (x86/amd64/ppc/etc) GCC is configured for?

So I can use it like:

#ifdef PPCARCH
  dosomething();
#endif

http://sourceforge.net/apps/mediawiki/predef/index.php?title=Architectures - but I'm not sure how accurate is this. — Piotr Praszmo, Sep 26 '12 at 20:28

score 5 · Accepted Answer · edited Sep 27 '12 at 06:30

5

To detect the architecture at compile time in the source code use a predefined macro.

According to this article, it will always have a name in a form _arch_ or __arch__ where the arch is the name of the target architecture. To see what exactly defined, use the following command:

touch foo.h; cpp -dM foo.h; rm foo.h

It will print out all predefined macros.

To print out on the command line, try:

gcc -dumpmachine

It will show the target the GCC is is built for.

edited Sep 27 '12 at 06:30

Prof. Falken

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answered Sep 26 '12 at 20:30

Serge

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I think I was unclear, so I updated my question. – Prof. Falken Sep 26 '12 at 20:37
@AmigableClarkKant I updated the answer to reflect your clarification – Serge Sep 26 '12 at 20:51

Detect which target CPU a GCC configured for?

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