tcc: Requires return values even after exit() calls
I got a working tcc compiler again. Common problem with that new version is that it would expect functions to return value even after there's been exit() call.
Not considering these failures with tcc a 2.6.4 release blocker, as they are not a regression since 2.6.3 and tcc setup has not worked for some time. Try to fix things to 2.6.5.