* m4/pthread_sigmask.m4 (gl_FUNC_PTHREAD_SIGMASK): Omit gl_THREADLIB

test, which runs afoul of Automake installations where, for example,
/usr/share/aclocal contains a copy of gl_THREADLIB.
Problem reported by Sven Joachim in
<http://lists.gnu.org/archive/html/emacs-devel/2011-07/msg00529.html>.
This is just a quick temporary fix, specific to Emacs; I'll work
with the other gnulib maintainers to get a more-permanent fix.

2 files changed, 9 insertions, 51 deletions

diff --git a/ChangeLog b/ChangeLog
index f7504583c25..9f681810d94 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
 2011-07-09  Paul Eggert  <eggert@cs.ucla.edu>
 
+        * m4/pthread_sigmask.m4 (gl_FUNC_PTHREAD_SIGMASK): Omit gl_THREADLIB
+        test, which runs afoul of Automake installations where, for example,
+        /usr/share/aclocal contains a copy of gl_THREADLIB.
+        Problem reported by Sven Joachim in
+        <http://lists.gnu.org/archive/html/emacs-devel/2011-07/msg00529.html>.
+        This is just a quick temporary fix, specific to Emacs; I'll work
+        with the other gnulib maintainers to get a more-permanent fix.
+
         Add gnulib's strtoimax module, needed on Solaris 8.
         * Makefile.in (GNULIB_MODULES): Add strtoimax.
         * lib/strtoll.c, m4/strtoimax.m4, m4/strtoll.m4: New files,
diff --git a/m4/pthread_sigmask.m4 b/m4/pthread_sigmask.m4
index dfa0f660a75..e98d8e0f4ea 100644
--- a/m4/pthread_sigmask.m4
+++ b/m4/pthread_sigmask.m4
@@ -1,4 +1,4 @@
-# pthread_sigmask.m4 serial 7
+# pthread_sigmask.m4 serial 7-emacs1
 dnl Copyright (C) 2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -8,55 +8,6 @@ AC_DEFUN([gl_FUNC_PTHREAD_SIGMASK],
 [
   AC_CHECK_FUNCS_ONCE([pthread_sigmask])
   LIB_PTHREAD_SIGMASK=
-  m4_ifdef([gl_THREADLIB], [
-    AC_REQUIRE([gl_THREADLIB])
-    if test "$gl_threads_api" = posix; then
-      if test $ac_cv_func_pthread_sigmask = yes; then
-        dnl pthread_sigmask is available without -lpthread.
-        :
-      else
-        if test -n "$LIBMULTITHREAD"; then
-          AC_CACHE_CHECK([for pthread_sigmask in $LIBMULTITHREAD],
-            [gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD],
-            [gl_save_LIBS="$LIBS"
-             LIBS="$LIBS $LIBMULTITHREAD"
-             AC_LINK_IFELSE(
-               [AC_LANG_PROGRAM(
-                  [[#include <pthread.h>
-                    #include <signal.h>
-                  ]],
-                  [[return pthread_sigmask (0, (sigset_t *) 0, (sigset_t *) 0);]])
-               ],
-               [gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD=yes],
-               [gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD=no])
-             LIBS="$gl_save_LIBS"
-            ])
-          if test $gl_cv_func_pthread_sigmask_in_LIBMULTITHREAD = yes; then
-            dnl pthread_sigmask is available with -lpthread.
-            LIB_PTHREAD_SIGMASK="$LIBMULTITHREAD"
-          else
-            dnl pthread_sigmask is not available at all.
-            HAVE_PTHREAD_SIGMASK=0
-          fi
-        else
-          dnl pthread_sigmask is not available at all.
-          HAVE_PTHREAD_SIGMASK=0
-        fi
-      fi
-    else
-      dnl pthread_sigmask may exist but does not interoperate with the chosen
-      dnl multithreading facility.
-      dnl If "$gl_threads_api" = pth, we could use the function pth_sigmask,
-      dnl but it is equivalent to sigprocmask, so we choose to emulate
-      dnl pthread_sigmask with sigprocmask also in this case. This yields fewer
-      dnl link dependencies.
-      if test $ac_cv_func_pthread_sigmask = yes; then
-        REPLACE_PTHREAD_SIGMASK=1
-      else
-        HAVE_PTHREAD_SIGMASK=0
-      fi
-    fi
-  ] ,[
     dnl gl_THREADLIB is not in use.  Assume the application wants
     dnl POSIX semantics.
     if test $ac_cv_func_pthread_sigmask != yes; then
@@ -69,7 +20,6 @@ AC_DEFUN([gl_FUNC_PTHREAD_SIGMASK],
         LIB_PTHREAD_SIGMASK=$ac_cv_search_pthread_sigmask
       fi
     fi
-  ])
   AC_SUBST([LIB_PTHREAD_SIGMASK])
   dnl We don't need a variable LTLIB_PTHREAD_SIGMASK, because when
   dnl "$gl_threads_api" = posix, $LTLIBMULTITHREAD and $LIBMULTITHREAD are the