$ xcrun --sdk macosx --find clang
/Library/Developer/CommandLineTools/usr/bin/clang
$ /Library/Developer/CommandLineTools/usr/bin/clang -dM -E - < /dev/null
#define OBJC_NEW_PROPERTIES 1
#define _LP64 1
#define __APPLE_CC__ 6000
#define __APPLE__ 1
#define __ATOMIC_ACQUIRE 2
#define __ATOMIC_ACQ_REL 4
#define __ATOMIC_CONSUME 1
#define __ATOMIC_RELAXED 0
#define __ATOMIC_RELEASE 3
#define __ATOMIC_SEQ_CST 5
...
Created
December 22, 2018 02:20
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HOWTO dump clang predefined macros
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