Fix bug introduced on 2010-03-14.

diff --git a/ChangeLog b/ChangeLog
index 9691cf7..5e29ad3 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
 2010-03-18  Bruno Haible  <bruno@clisp.org>
 
+       Fix bug introduced on 2010-03-14.
+       * m4/spawn_h.m4 (gl_HAVE_POSIX_SPAWN): New macro.
+       (gl_SPAWN_H): Require it.
+       * m4/posix_spawn.m4 (gl_POSIX_SPAWN_BODY): Likewise.
+       Reported by Simon Josefsson.
+
+2010-03-18  Bruno Haible  <bruno@clisp.org>
+
        Fix typo introduced on 2009-12-31.
        * m4/spawn_h.m4 (gl_SPAWN_H): Check for the declaration of
        posix_spawn_file_actions_adddup2.

diff --git a/m4/posix_spawn.m4 b/m4/posix_spawn.m4
index 3053bdb..40df135 100644 (file)
--- a/m4/posix_spawn.m4
+++ b/m4/posix_spawn.m4
@@ -1,4 +1,4 @@
-# posix_spawn.m4 serial 6
+# posix_spawn.m4 serial 7
 dnl Copyright (C) 2008-2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -13,7 +13,7 @@ AC_DEFUN([gl_POSIX_SPAWN],
 AC_DEFUN([gl_POSIX_SPAWN_BODY],
 [
   AC_REQUIRE([gl_SPAWN_H_DEFAULTS])
-  AC_CHECK_FUNCS_ONCE([posix_spawn])
+  AC_REQUIRE([gl_HAVE_POSIX_SPAWN])
   dnl Assume that when the main function exists, all the others,
   dnl except posix_spawnattr_{get,set}sched*, are available as well.
   dnl AC_CHECK_FUNCS_ONCE([posix_spawnp])

diff --git a/m4/spawn_h.m4 b/m4/spawn_h.m4
index da7582f..226cdcf 100644 (file)
--- a/m4/spawn_h.m4
+++ b/m4/spawn_h.m4
@@ -1,4 +1,4 @@
-# spawn_h.m4 serial 9
+# spawn_h.m4 serial 10
 dnl Copyright (C) 2008-2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -33,10 +33,7 @@ AC_DEFUN([gl_SPAWN_H],
   fi
   AC_SUBST([HAVE_SPAWN_H])
 
-  AC_CHECK_FUNCS_ONCE([posix_spawn])
-  if test $ac_cv_func_posix_spawn != yes; then
-    HAVE_POSIX_SPAWN=0
-  fi
+  AC_REQUIRE([gl_HAVE_POSIX_SPAWN])
 
   AC_REQUIRE([AC_C_RESTRICT])
 
@@ -55,6 +52,20 @@ AC_DEFUN([gl_SPAWN_H],
     posix_spawn_file_actions_adddup2])
 ])
 
+dnl Checks whether the system has the functions posix_spawn.
+dnl Sets ac_cv_func_posix_spawn and HAVE_POSIX_SPAWN.
+AC_DEFUN([gl_HAVE_POSIX_SPAWN],
+[
+  dnl Use AC_REQUIRE here, so that the default behavior below is expanded
+  dnl once only, before all statements that occur in other macros.
+  AC_REQUIRE([gl_SPAWN_H_DEFAULTS])
+
+  AC_CHECK_FUNCS_ONCE([posix_spawn])
+  if test $ac_cv_func_posix_spawn != yes; then
+    HAVE_POSIX_SPAWN=0
+  fi
+])
+
 dnl Unconditionally enables the replacement of <spawn.h>.
 AC_DEFUN([gl_REPLACE_SPAWN_H],
 [