maint: update copyright

[gnulib.git] / m4 / strsignal.m4

diff --git a/m4/strsignal.m4 b/m4/strsignal.m4
index 5244dcb..b9dfeca 100644 (file)
--- a/m4/strsignal.m4
+++ b/m4/strsignal.m4
@@ -1,5 +1,5 @@
-# strsignal.m4 serial 2
-dnl Copyright (C) 2008 Free Software Foundation, Inc.
+# strsignal.m4 serial 8
+dnl Copyright (C) 2008-2014 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.
@@ -19,37 +19,41 @@ AC_DEFUN([gl_FUNC_STRSIGNAL],
 
   AC_CHECK_FUNCS([strsignal])
   if test $ac_cv_func_strsignal = yes; then
+    HAVE_STRSIGNAL=1
     dnl Check if strsignal behaves reasonably for out-of-range signal numbers.
     dnl On Solaris it returns NULL; on AIX 5.1 it returns (char *) -1.
     AC_CACHE_CHECK([whether strsignal always returns a string],
       [gl_cv_func_working_strsignal],
       [AC_RUN_IFELSE(
-        [AC_LANG_PROGRAM(
-           [[#include <string.h>
-           ]],
-           [[char *s = strsignal (-1);
-             return !(s != (char *) 0 && s != (char *) -1);]])],
-        [gl_cv_func_working_strsignal=yes],
-        [gl_cv_func_working_strsignal=no],
-        [case "$host_os" in
-           solaris* | aix*) gl_cv_func_working_strsignal=no;;
-           *)               gl_cv_func_working_strsignal="guessing yes";;
-         esac])])
-  else
-    gl_cv_func_working_strsignal=no
-  fi
-
-  if test "$gl_cv_func_working_strsignal" = no; then
-    if test $ac_cv_func_strsignal = yes; then
+         [AC_LANG_PROGRAM(
+            [[#include <string.h>
+#include <unistd.h> /* NetBSD 5.0 declares it in wrong header. */
+            ]],
+            [[int result = 0;
+              char *s = strsignal (-1);
+              if (s == (char *) 0)
+                result |= 1;
+              if (s == (char *) -1)
+                result |= 2;
+              return result;
+            ]])],
+         [gl_cv_func_working_strsignal=yes],
+         [gl_cv_func_working_strsignal=no],
+         [case "$host_os" in
+            solaris* | aix*) gl_cv_func_working_strsignal=no;;
+            *)               gl_cv_func_working_strsignal="guessing yes";;
+          esac])])
+    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>]])
 ])