https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84269
--- Comment #7 from David Malcolm <dmalcolm at gcc dot gnu.org> --- Another one, from https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82967#c1 #include <math.h> void test (float pf, float inff) { assert (pf == inff); } <source>: In function 'test': <source>:5:3: warning: implicit declaration of function 'assert'; did you mean 'sqrt'? [-Wimplicit-function-declaration] assert (pf == inff); ^~~~~~ sqrt We should suggest including <assert.h> for this.