-# strsignal.m4 serial 3
-dnl Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
+# strsignal.m4 serial 8
+dnl Copyright (C) 2008-2012 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_CHECK_FUNCS([strsignal])
if test $ac_cv_func_strsignal = yes; then
+ HAVE_STRSIGNAL=1
dnl Check if strsignal behaves reasonably for out-of-range signal numbers.
dnl On Solaris it returns NULL; on AIX 5.1 it returns (char *) -1.
AC_CACHE_CHECK([whether strsignal always returns a string],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <string.h>
+#include <unistd.h> /* NetBSD 5.0 declares it in wrong header. */
]],
- [[char *s = strsignal (-1);
- return !(s != (char *) 0 && s != (char *) -1);]])],
+ [[int result = 0;
+ char *s = strsignal (-1);
+ if (s == (char *) 0)
+ result |= 1;
+ if (s == (char *) -1)
+ result |= 2;
+ return result;
+ ]])],
[gl_cv_func_working_strsignal=yes],
[gl_cv_func_working_strsignal=no],
[case "$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
-
- if test "$gl_cv_func_working_strsignal" = no; then
- if test $ac_cv_func_strsignal = yes; then
+ if test "$gl_cv_func_working_strsignal" = no; then
REPLACE_STRSIGNAL=1
fi
- AC_LIBOBJ([strsignal])
- gl_PREREQ_STRSIGNAL
+ else
+ HAVE_STRSIGNAL=0
fi
])
# Prerequisites of lib/strsignal.c.
AC_DEFUN([gl_PREREQ_STRSIGNAL], [
+ AC_CHECK_HEADERS_ONCE([unistd.h])
AC_REQUIRE([AC_DECL_SYS_SIGLIST])
- AC_CHECK_DECLS([_sys_siglist], [], [], [#include <signal.h>])
+ AC_CHECK_DECLS([_sys_siglist], [], [], [[#include <signal.h>]])
])