fix for link error on mingw with close module

[Ben Pfaff]

When the close module is used on Windows, lib/close.c calls
functions that are defined in libws2_32, but there is nothing
that will cause us to link against that library.  Thus, this
commit adds $(LIB_CLOSE) to put on the linker command line to
supply -lws2_32 when necessary.

This might need a little bit of explanation.  When a program
actually uses sockets, through the sockets module, $(LIBSOCKET)
will link against the correct library.  This change is useful for
indirect use of the ws2_32 library, via e.g. the gethostname
module.

This commit is due to a problem showing up in PSPP.

Comments?

commit df1da811f288a89eb524a4176c6fd62bacfb954a
Author: Ben Pfaff <address@hidden>
Date:   Thu Feb 5 22:11:57 2009 -0800

    Fix link errors on Windows when close module is used.
    
    * modules/close: Add $(LIB_CLOSE) to Link section.
    * m4/close.m4 (gl_REPLACE_CLOSE): Substitute -lws2_32 into
    $(LIB_CLOSE) on Windows.

diff --git a/ChangeLog b/ChangeLog
index 3d87cd3..2d07367 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2009-02-05  Ben Pfaff  <address@hidden>
+
+       Fix link errors on Windows when close module is used.
+       * modules/close: Add $(LIB_CLOSE) to Link section.
+       * m4/close.m4 (gl_REPLACE_CLOSE): Substitute -lws2_32 into
+       $(LIB_CLOSE) on Windows.
+
 2009-02-05  Jim Meyering  <address@hidden>
 
        still avoid unused-parameter warnings, but do it cleanly
diff --git a/m4/close.m4 b/m4/close.m4
index fcc9fb1..29d3abd 100644
--- a/m4/close.m4
+++ b/m4/close.m4
@@ -22,4 +22,6 @@ AC_DEFUN([gl_REPLACE_CLOSE],
   fi
   REPLACE_CLOSE=1
   gl_REPLACE_FCLOSE
+  LIB_CLOSE="-lws2_32"
+  AC_SUBST([LIB_CLOSE])
 ])
diff --git a/modules/close b/modules/close
index bb852d4..138be1b 100644
--- a/modules/close
+++ b/modules/close
@@ -19,6 +19,9 @@ Makefile.am:
 Include:
 <unistd.h>
 
+Link:
+$(LIB_CLOSE)
+
 License:
 LGPLv2+
 


-- 
Ben Pfaff 
http://benpfaff.org