Simplify by using Gnulib sigdescr_np module

Inspired by a straightforward patch by Bruno Haible.
* admin/merge-gnulib (GNULIB_MODULES): Add sigdescr_np.
* configure.ac: Do not check for sys_siglist or __sys_siglist.
* lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.
* lib/sigdescr_np.c, m4/sigdescr_np.m4: New files, copied from Gnulib.
* src/sysdep.c (sys_siglist, sys_siglist_entries): Remove.
(init_signals): Do not initialize sys_siglist.
(safe_strsignal): Use sigdescr_np instead of sys_siglist.

2 files changed, 1 insertions, 3 deletions

diff --git a/admin/CPP-DEFINES b/admin/CPP-DEFINES
index ce9a44436d8..a40b4302723 100644
--- a/admin/CPP-DEFINES
+++ b/admin/CPP-DEFINES
@@ -124,9 +124,7 @@ HAVE_DECL_STRTOIMAX
 HAVE_DECL_STRTOLL
 HAVE_DECL_STRTOULL
 HAVE_DECL_STRTOUMAX
-HAVE_DECL_SYS_SIGLIST
 HAVE_DECL_TZNAME
-HAVE_DECL___SYS_SIGLIST
 HAVE_DIALOGS
 HAVE_DIFFTIME
 HAVE_DUP2
diff --git a/admin/merge-gnulib b/admin/merge-gnulib
index 3f32536a629..164300e1db6 100755
--- a/admin/merge-gnulib
+++ b/admin/merge-gnulib
@@ -40,7 +40,7 @@ GNULIB_MODULES='
   manywarnings memmem-simple mempcpy memrchr minmax mkostemp mktime nstrftime
   pathmax pipe2 pselect pthread_sigmask
   qcopy-acl readlink readlinkat regex
-  sig2str socklen stat-time std-gnu11 stdalign stddef stdio
+  sig2str sigdescr_np socklen stat-time std-gnu11 stdalign stddef stdio
   stpcpy strnlen strtoimax symlink sys_stat sys_time
   tempname time time_r time_rz timegm timer-time timespec-add timespec-sub
   update-copyright unlocked-io utimensat