Added define 'unused_' for '__attribute__((unused))'. The oldest version
of GCC with online docs (GCC 2.95.3, released in March 16, 2001 [1])
already has support for this attribute, so it doesn't make sense to
check the version.
Renamed 'noreturn' to 'noreturn_' for consistency.
[1] https://gcc.gnu.org/onlinedocs/
Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>
`__attribute__((noreturn))` has been supported since GCC 2.5, that was
released October 22, 1993. It doesn't make sense to check if the version
is at least that one, we are compiling for C99, that is more modern. [1]
Also, remove the MSVC check. This code is never compiled with it so
there may be problems that need to be solved to make it compile. All
releases cross-compiled from linux. If there is an actual need to
support MSVC, the compiler definitions can be added again.
Also, if the compiler is not supported, the compiler helpers default to
nothing, so the code can still compile.
[1] https://gcc.gnu.org/onlinedocs/
Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>
