| I downloaded a Lua 5.4.8 source tarball and checked all the uses of LUA_USE_C89 (manually, without AI): luaconf.h:50-655 - windows builds always use C89 (quote: "broadly, Windows is C89") - in C99 Lua uses 'strtod' and 'sprintf' for hex number conversions. Otherwise, Lua provides its own implementation. - no math function variants with l_ and f_ prefixes in C89 - optional lua_KContext type is not available with C89 llimits.h:79 - type definition C99: uintptr.t vs C89: size_t llimits.h:184 - in C99 or GCC Lua has a pragma for inlining functions, otherwise it's macro'ed to nothing lmathlib.c:176 - math_log has an additional optimization in C99 if (base == l_mathop(2.0))
res = l_mathop(log2)(x);
else
lmathlib.c:285- LUA_RAND32 define might fail to find 64-bit type (comment says it's for testing) loslib.c:36 - `strftime()` only supports one-char options in C89 lprefix.h:14 - no _XOPEN_SOURCE with C89 (POSIX/XSI stuff)
- no _LARGEFILE_SOURCE with C89 (manipulation of large files in gcc and other compilers) both of these defines don't appear anywhere else in Lua source code |