Fix compilation error when modules 'posix_spawn[p]' are not used.

[gnulib.git] / m4 / spawn_h.m4

diff --git a/m4/spawn_h.m4 b/m4/spawn_h.m4
index fb789f0..22511c7 100644 (file)
--- a/m4/spawn_h.m4
+++ b/m4/spawn_h.m4
@@ -1,4 +1,4 @@
-# spawn_h.m4 serial 7
+# spawn_h.m4 serial 8
 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,
@@ -33,6 +33,11 @@ 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([AC_C_RESTRICT])
 
   dnl Check for declarations of anything we want to poison if the