Warnings

Be careful when you specify -features=%all or -features=%none. The set of features can change with each compiler release and with each patch. Consequently, you can get unintended behavior.

The behavior of a program might change when you use the -features=tmplife option. Testing whether the program works both with and without the -features=tmplife option is one way to test the program’s portability.

The compiler assumes -features=split_init by default in compat mode (-compt=4). If you use the -features=%none option to turn off other features, you may find it desirable to turn the splitting of initializers into separate functions back on by using -features=%none,split_init instead.