Which C standard (ANSI, c99...) does my Clang compiler adopt?

Asked Sep 27 '19 at 08:18

Active Sep 27 '19 at 08:18

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How can I know which C standard my current Clang compiler adopts? The version of the compiler is shown below:

$ clang --version
Apple clang version 11.0.0 (clang-1100.0.33.8)
Target: x86_64-apple-darwin18.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

I read that

Clang 3.3 and later implement all of the ISO C++ 2011 standard. By default, Clang builds C++ code according to the C++98 standard, with many C++11 features accepted as extensions.

But these are talking about C++ standard. I am concerned with which C standard (Ansi, C99 etc) my Clang compiler is using.

asked Sep 27 '19 at 08:18

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`printf("%ld\n", __STDC_VERSION__);` can help – David Ranieri Sep 27 '19 at 08:20
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@Lundin I am not sure that is good dupe. It has no mention of clang. – user694733 Sep 27 '19 at 08:34
@user694733 It isn't compiler-specific, you can check this by using standard C. – Lundin Sep 27 '19 at 08:37
@Lundin Perhaps you are right. I first read the question as *"What C standards my compiler supports?"*, while question is more like *"What C standard does my compiler use by default?"*, in which case the duplicate works. – user694733 Sep 27 '19 at 08:42

Which C standard (ANSI, c99...) does my Clang compiler adopt?

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