your C is not standard C

Automated excerpt

The committee has created an unreal language that no one can or will actually use. this is an incomplete list of some incompatibilities between c as it's written in the standard and c as it exists in the real world for people who use gcc/clang + glibc/musl. by default, gcc and clang recognize the asm keyword as an extension. this is not strictly conformant, because in standard c, asm is a valid non-reserved identifier. so code which conforms to the standard may not compile with gcc/clang with their default settings.

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