Replace zero-length arrays with flexible arrays #68
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NB: Flexible arrays are standardized since C99 whereas
zero-length arrays are a GCC extension that yield
undefined behaviour, in general.
See also: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
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This eliminates undefined behaviour.
It could increase portability, i.e. when the numbers of C compilers that support C99 style flexible arrays outgrows the number of pre-99 C compilers that support GCC style zero-length arrays.
NB: Flexible arrays are standardized since C99 whereas
zero-length arrays are a GCC extension that yield
undefined behaviour, in general.
See also: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html