patch 8.0.1736: check for C99 features is incomplete commit https://github.com/vim/vim/commit/226400830b470774bf5a552e1af10706b609720c Author: Bram Moolenaar <Bram@vim.org> Date: Thu Apr 19 20:39:41 2018 +0200 patch 8.0.1736: check for C99 features is incomplete Problem: Check for C99 features is incomplete. Solution: Use AC_PROG_CC_C99 and when C99 isn't fully supported check the features we need. (James McCoy, closes #2820)

TYPEMAP
VIWIN	T_VIOBJNOMUNGE
VIBUF	T_VIOBJNOMUNGE

INPUT
T_VIOBJNOMUNGE
	if (sv_isa($arg, \"${ntype}\")) {
	    IV tmp = SvIV((SV*)SvRV($arg));
	    $var = INT2PTR($type, tmp);
	    if (!tmp)
		croak(\"$ntype no longer exists\");
	}
	else
	    croak(\"$var is not of type ${ntype}\")