m4/assert_h.m4

   1 # assert-h.m4
   2 dnl Copyright (C) 2011-2021 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 dnl From Paul Eggert.
   8
   9 AC_DEFUN([gl_ASSERT_H],
  10 [
  11   ASSERT_H=
  12   AC_CACHE_CHECK([for static_assert], [gl_cv_static_assert],
  13     [AC_COMPILE_IFELSE(
  14        [AC_LANG_PROGRAM(
  15           [[#include <assert.h>
  16             static_assert (2 + 2 == 4, "arithmetic doesn't work");
  17             static_assert (2 + 2 == 4);
  18           ]],
  19           [[
  20             static_assert (sizeof (char) == 1, "sizeof doesn't work");
  21             static_assert (sizeof (char) == 1);
  22           ]])],
  23        [gl_cv_static_assert=yes],
  24        [gl_cv_static_assert=no])])
  25   if test $gl_cv_static_assert = no; then
  26     ASSERT_H=assert.h
  27     gl_NEXT_HEADERS([assert.h])
  28   fi
  29   AC_SUBST([ASSERT_H])
  30   AM_CONDITIONAL([GL_GENERATE_ASSERT_H], [test -n "$ASSERT_H"])
  31 ])