Casting to (unsigned char) for is...() family.
Argument of isxxx() casted to (unsigned char).
fixed bug on _EXE.
Set -Z flag for diff only on Windows
Moved [KO] back to [FAIL].
Extreme simplification of building system.
Removed non C90 idioms.
Simplified build. Only for gcc and clang on Linux.
Added the -Z flag to diff to make the test working with gema on Windows.
Fixed warnings emitted by gcc 9.4, gcc 11.2, clang 10.0 and cl 19.29 .
Added './' in front of 'gemabuild'.