build: enforce C11 as minimum compiler standard#617
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Replace obsolete AC_PROG_CC_C99 with AC_PROG_CC (which auto-selects the
newest available standard: C17 on GCC 8+, C11 on GCC 4.9-7) and add an
AC_COMPILE_IFELSE gate that aborts configure if __STDC_VERSION__ < 201112L.
Makes C11 or newer a hard build requirement in line with the project coding
guidelines ("C11 recommended, C99 acceptable") and enables use of _Static_assert,
_Noreturn, and inline functions without preprocessor guards.
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Replace obsolete AC_PROG_CC_C99 with AC_PROG_CC (which auto-selects the newest available standard: C17 on GCC 8+, C11 on GCC 4.9-7) and add an AC_COMPILE_IFELSE gate that aborts configure if STDC_VERSION < 201112L.
Description
Makes C11 or newer a hard build requirement in line with the project coding guidelines ("C11 recommended, C99 acceptable") and enables use of _Static_assert, _Noreturn, and inline functions without preprocessor guards.
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