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# Check for stdnoreturn.h that conforms to C11.
dnl Copyright 2012-2014 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
# Prepare for substituting <stdnoreturn.h> if it is not supported.
AC_DEFUN([gl_STDNORETURN_H],
[
AC_CACHE_CHECK([for working stdnoreturn.h],
[gl_cv_header_working_stdnoreturn_h],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
#include <stdnoreturn.h>
/* Do not check for 'noreturn' after the return type.
C11 allows it, but it's rarely done that way
and circa-2012 bleeding-edge GCC rejects it when given
-Werror=old-style-declaration. */
noreturn void foo1 (void) { exit (0); }
_Noreturn void foo2 (void) { exit (0); }
int testit (int argc, char **argv) {
if (argc & 1)
return 0;
(argv[0][0] ? foo1 : foo2) ();
}
]])],
[gl_cv_header_working_stdnoreturn_h=yes],
[gl_cv_header_working_stdnoreturn_h=no])])
if test $gl_cv_header_working_stdnoreturn_h = yes; then
STDNORETURN_H=''
else
STDNORETURN_H='stdnoreturn.h'
fi
AC_SUBST([STDNORETURN_H])
AM_CONDITIONAL([GL_GENERATE_STDNORETURN_H], [test -n "$STDNORETURN_H"])
])
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