https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88944
--- Comment #3 from Jonny Grant <jg at jguk dot org> --- Hi Eric, Just ran gcc (Compiler-Explorer-Build) 10.0.0 20190823 (experimental) on godbolt.org, but it didn't suggest stdbool.h https://godbolt.org/z/Bn_o7f Does it work for you?