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, 6 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 90b57c4c3da..2d4d7a66eb0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2012-10-07  Paul Eggert  <eggert@cs.ucla.edu>
+
+        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.
+
 2012-10-04  Paul Eggert  <eggert@cs.ucla.edu>
 
         Merge from gnulib, incorporating: