Improve sys_siglist detection.

* configure.ac (sys_siglist): Look for its decl in <signal.h>.
Otherwise, it's not found in either Fedora 17 or Solaris 11.
* src/sysdep.c (sys_siglist, init_signals): Use _sys_siglist if it's
defined as a macro, as is done in Solaris.
(sys_siglist_entries): New macro.
(save_strsignal): Use it.
* src/syssignal.h (safe_strsignal): Now ATTRIBUTE_CONST, to pacify
GCC 4.7.2 on Fedora 17 with the fixed sys_siglist detection.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index b960837eaab..a30dde5e4ea 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,13 @@
+2012-10-07  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Improve sys_siglist detection.
+        * sysdep.c (sys_siglist, init_signals): Use _sys_siglist if it's
+        defined as a macro, as is done in Solaris.
+        (sys_siglist_entries): New macro.
+        (save_strsignal): Use it.
+        * syssignal.h (safe_strsignal): Now ATTRIBUTE_CONST, to pacify
+        GCC 4.7.2 on Fedora 17 with the fixed sys_siglist detection.
+
 2012-10-06  Jan Djärv  <jan.h.d@swipnet.se>
 
         * nsfns.m (Fx_create_frame): Call x_default_parameter with