-# strsignal.m4 serial 3
-dnl Copyright (C) 2008 Free Software Foundation, Inc.
+# strsignal.m4 serial 5
+dnl Copyright (C) 2008-2011 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.
AC_CACHE_CHECK([whether strsignal always returns a string],
[gl_cv_func_working_strsignal],
[AC_RUN_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <string.h>
- ]],
- [[char *s = strsignal (-1);
- return !(s != (char *) 0 && s != (char *) -1);]])],
- [gl_cv_func_working_strsignal=yes],
- [gl_cv_func_working_strsignal=no],
- [case "$host_os" in
- solaris* | aix*) gl_cv_func_working_strsignal=no;;
- *) gl_cv_func_working_strsignal="guessing yes";;
- esac])])
+ [AC_LANG_PROGRAM(
+ [[#include <string.h>
+#include <unistd.h> /* NetBSD 5.0 declares it in wrong header. */
+ ]],
+ [[int result = 0;
+ char *s = strsignal (-1);
+ if (s == (char *) 0)
+ result |= 1;
+ if (s == (char *) -1)
+ result |= 2;
+ return result;
+ ]])],
+ [gl_cv_func_working_strsignal=yes],
+ [gl_cv_func_working_strsignal=no],
+ [case "$host_os" in
+ solaris* | aix*) gl_cv_func_working_strsignal=no;;
+ *) gl_cv_func_working_strsignal="guessing yes";;
+ esac])])
else
gl_cv_func_working_strsignal=no
fi