# configure.ac - stupidtools bootstrap (autotools, C23).
#
# This is the *bootstrap* build only: stupidtools will later generate its
# own ./configure (self-hosting, todo 23). Only Makefile.am inputs are
# tracked in git; configure/Makefile* are generated and gitignored.

AC_PREREQ([2.71])
AC_INIT([stupidtools], [1.0.0], [huntedbytheirs@example.com])
AM_INIT_AUTOMAKE([foreign subdir-objects])
AC_CONFIG_SRCDIR([src/main.c])
AC_PROG_CC

# Require a compiler that actually accepts C23 (ISO/IEC 9899:2024).
# -std=c23: GCC >= 14, Clang >= 18. Never -std=c2y (next draft, not ratified).
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -std=c23 -Werror"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
  [[#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 202311L
#error "C23 (__STDC_VERSION__ >= 202311L) required"
#endif]],
  [[_Static_assert(1, "ok");]])],
  [],
  [AC_MSG_ERROR([a C compiler with C23 support (GCC >= 14 or Clang >= 18) is required])])
CFLAGS="$save_CFLAGS"

AC_CONFIG_FILES([Makefile src/Makefile])
AC_OUTPUT