[Asmod4n]

char on linux arm is unsigned, makes for fun surprises when you only ever dealt with x86 and assumed char to be signed everywhere.

[pkasting]

This bit us in Chromium. We at least discussed forcing the compiler to use unsigned char on all platforms; I don't recall if that actually happened.

[MaskRay]

I recall that google3 switched to -funsigned-char for x86-64 a long time ago.