configure: move pthread check it its own file

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>

configure.ac

@@ -293,40 +293,7 @@ AC_CHECK_FUNCS_ONCE([cfmakeraw fallocate geteuid getgid getgrnam_r \
   posix_memalign prlimit regexec sched_getaffinity setgroups setns \
   setrlimit symlink sysctlbyname getifaddrs sched_setscheduler unshare])
 
-dnl Availability of pthread functions. Because of $LIB_PTHREAD, we
+LIBVIRT_CHECK_PTHREAD
-dnl cannot use AC_CHECK_FUNCS_ONCE. LIB_PTHREAD and LIBMULTITHREAD
-dnl were set during gl_INIT by gnulib.
-old_LIBS=$LIBS
-LIBS="$LIBS $LIB_PTHREAD $LIBMULTITHREAD"
-
-pthread_found=yes
-AC_CHECK_FUNCS([pthread_mutexattr_init])
-AC_CHECK_HEADER([pthread.h],,[pthread_found=no])
-
-if test "$ac_cv_func_pthread_mutexattr_init:$pthread_found" != "yes:yes"
-then
-  AC_MSG_ERROR([A pthreads impl is required for building libvirt])
-fi
-
-dnl At least mingw64-winpthreads #defines pthread_sigmask to 0,
-dnl which in turn causes compilation to complain about unused variables.
-dnl Expose this broken implementation, so we can work around it.
-AC_CACHE_CHECK([whether pthread_sigmask does anything],
-  [lv_cv_pthread_sigmask_works],
-  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-    #include <sys/types.h>
-    #include <signal.h>
-  ]], [[
-    #ifdef pthread_sigmask
-    int (*foo)(int, const sigset_t *, sigset_t *) = &pthread_sigmask;
-    return !foo;
-    #endif
-  ]])], [lv_cv_pthread_sigmask_works=yes], [lv_cv_pthread_sigmask_works=no])])
-if test "x$lv_cv_pthread_sigmask_works" != xyes; then
-  AC_DEFINE([FUNC_PTHREAD_SIGMASK_BROKEN], [1],
-    [Define to 1 if pthread_sigmask is not a real function])
-fi
-LIBS=$old_LIBS
 
 dnl Availability of various common headers (non-fatal if missing).
 AC_CHECK_HEADERS([pwd.h regex.h sys/un.h \

m4/virt-pthread.m4

@@ -0,0 +1,56 @@
+dnl The libpthread.so library
+dnl
+dnl Copyright (C) 2016 Red Hat, Inc.
+dnl
+dnl This library is free software; you can redistribute it and/or
+dnl modify it under the terms of the GNU Lesser General Public
+dnl License as published by the Free Software Foundation; either
+dnl version 2.1 of the License, or (at your option) any later version.
+dnl
+dnl This library is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+dnl Lesser General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU Lesser General Public
+dnl License along with this library.  If not, see
+dnl <http://www.gnu.org/licenses/>.
+dnl
+
+AC_DEFUN([LIBVIRT_CHECK_PTHREAD], [
+  old_LIBS="$LIBS"
+
+  dnl Availability of pthread functions. Because of $LIB_PTHREAD, we
+  dnl cannot use AC_CHECK_FUNCS_ONCE. LIB_PTHREAD and LIBMULTITHREAD
+  dnl were set during gl_INIT by gnulib.
+  LIBS="$LIBS $LIB_PTHREAD $LIBMULTITHREAD"
+  pthread_found=yes
+  AC_CHECK_FUNCS([pthread_mutexattr_init])
+  AC_CHECK_HEADER([pthread.h],,[pthread_found=no])
+
+  if test "$ac_cv_func_pthread_mutexattr_init:$pthread_found" != "yes:yes"
+  then
+    AC_MSG_ERROR([A pthreads impl is required for building libvirt])
+  fi
+
+  dnl At least mingw64-winpthreads #defines pthread_sigmask to 0,
+  dnl which in turn causes compilation to complain about unused variables.
+  dnl Expose this broken implementation, so we can work around it.
+  AC_CACHE_CHECK([whether pthread_sigmask does anything],
+    [lv_cv_pthread_sigmask_works],
+    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+      #include <sys/types.h>
+      #include <signal.h>
+    ]], [[
+      #ifdef pthread_sigmask
+      int (*foo)(int, const sigset_t *, sigset_t *) = &pthread_sigmask;
+      return !foo;
+      #endif
+    ]])], [lv_cv_pthread_sigmask_works=yes], [lv_cv_pthread_sigmask_works=no])])
+  if test "x$lv_cv_pthread_sigmask_works" != xyes; then
+    AC_DEFINE([FUNC_PTHREAD_SIGMASK_BROKEN], [1],
+      [Define to 1 if pthread_sigmask is not a real function])
+  fi
+
+  LIBS="$old_LIBS"
+])