Where is stdbool.h?

Question

I want to find the _Bool definition on my system, so for systems where it\'s missing I can implement it. I\'ve seen various definitions for it here and on other

Answer 1

$ echo '_Bool a;' | gcc -c -x c -
$ echo $?
0

$ echo 'bool a;' | gcc -x c -c -
:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘a’

This demonstrates that _Bool is a built-in type and bool is not, by compiling a single variable declaration with no includes.