What predefined macro can I use to detect clang?

Question

I'm trying to detect the compiler used to compile my source code. I can easily find predefined macros to check for MSVC or GCC (see https://github.com/cpredef/predef for example), but I cannot find any macro to check for clang.

Does someone know if clang defines a macro like __CLANG__ in order to know what is currently compiling my code ?

[Updated list of compiler macros](http://sourceforge.net/p/predef/wiki/Compilers/) — chrisaycock, Nov 30 '12 at 16:54

score 133 · Answer 1 · edited Jul 19 '17 at 17:00

133

To get a list of all the predefined macros that the compiler uses, use this:

clang -dM -E -x c /dev/null

You can do the same for gcc.

edited Jul 19 '17 at 17:00

Martijn Courteaux

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answered Apr 29 '11 at 04:00

Chris Suter

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score 89 · Accepted Answer · answered Apr 17 '10 at 13:23

89

Found the answer using strings + grep :

$ strings /usr/bin/clang | grep __ | grep -i clang
__clang__

answered Apr 17 '10 at 13:23

Pierre Bourdon

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score 44 · Answer 3 · answered Jul 27 '12 at 10:37

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This question has been answered for years but let me add (for future reference) how it is done in Windows:

echo | clang -dM -E -

same as for GCC:

echo | gcc -dM -E -

Please note: The last dash - is actually important! (Otherwise you get error: no input files for both compilers)

answered Jul 27 '12 at 10:37

Bernd Elkemann

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FYI, Windows equivalent of `/dev/null` is `NUL:` – legalize Nov 06 '13 at 21:38
@legalize Whoa! I didn't know that! That's pretty cool; where'd you find that? – MD XF Mar 08 '17 at 17:09
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It's been there since the DOS days, just most DOS/Windows users never needed it. – legalize Mar 08 '17 at 18:49
This is what I usually do in Linux as well. Typing `/dev/null` is more work. – Peter Cordes Jul 09 '17 at 10:49

What predefined macro can I use to detect clang?

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