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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 ?

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135

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.

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This answer omits the important piece of information, which is that __clang__ is indeed defined
96

Found the answer using strings + grep :

$ strings /usr/bin/clang | grep __ | grep -i clang
__clang__
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48

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)

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4 Comments

FYI, Windows equivalent of /dev/null is NUL:
@legalize Whoa! I didn't know that! That's pretty cool; where'd you find that?
It's been there since the DOS days, just most DOS/Windows users never needed it.
This is what I usually do in Linux as well. Typing /dev/null is more work.

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