Recognizing clang, gcc, and tcc by implementation-defined macros

Question

I use clang, gcc, and tcc, and I'd like to be able to differentiate between the three in a common header.

Judging by their macro dumps, I expect that the presence of the __clang__ macro will uniquely identify clang.

I'm unable to get a macro dump with tcc ( $compiler -x c -E -dM /dev/null doesn't work in its case ).

What is the macro(s) (if any) that will uniquely identify gcc (and possibly tcc)?

Answer 1

Use __TINYC__ to detect tcc¹.

Detection of gcc and clang is explained in this StackOverflow question: Detect gcc as opposed to msvc / clang with macro

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¹ (Quoted from: http://bellard.org/tcc/tcc-doc.html#SEC9)
__TINYC__ is a predefined macro to 1 to indicate that you use TCC.