Asked • 04/02/19

Why does the C preprocessor interpret the word "linux" as the constant "1"?

Why does the C preprocessor in GCC interpret the word `linux` (small letters) as the constant `1`? test.c: #include int main(void) { int linux = 5; return 0; } Result of `$ gcc -E test.c` (stop after the preprocessing stage): .... int main(void) { int 1 = 5; return 0; } Which -of course- yields an error. (BTW: There is no `#define linux` in the stdio.h file.)

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