* sys_socket_h.m4 (gl_HEADER_SYS_SOCKET): Don't attempt using

[gnulib.git] / m4 / socklen.m4

diff --git a/m4/socklen.m4 b/m4/socklen.m4
index 01da2b5..5e3765a 100644 (file)
--- a/m4/socklen.m4
+++ b/m4/socklen.m4
@@ -1,4 +1,4 @@
-# socklen.m4 serial 3
+# socklen.m4 serial 4
 dnl Copyright (C) 2005, 2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -13,40 +13,40 @@ dnl have to test to find something that will work.
 
 dnl On mingw32, socklen_t is in ws2tcpip.h ('int'), so we try to find
 dnl it there first.  That file is included by gnulib's socket_.h, which
-dnl all users of this module should include.
+dnl all users of this module should include.  Cygwin must not include
+dnl ws2tcpip.h.
 AC_DEFUN([gl_TYPE_SOCKLEN_T],
-  [AC_CHECK_HEADERS_ONCE([sys/socket.h ws2tcpip.h])
+  [AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl
    AC_CHECK_TYPE([socklen_t], ,
      [AC_MSG_CHECKING([for socklen_t equivalent])
       AC_CACHE_VAL([gl_cv_gl_cv_socklen_t_equiv],
-        [# Systems have either "struct sockaddr *" or
-         # "void *" as the second argument to getpeername
-         gl_cv_socklen_t_equiv=
-         for arg2 in "struct sockaddr" void; do
+       [# Systems have either "struct sockaddr *" or
+        # "void *" as the second argument to getpeername
+        gl_cv_socklen_t_equiv=
+        for arg2 in "struct sockaddr" void; do
           for t in int size_t "unsigned int" "long int" "unsigned long int"; do
             AC_TRY_COMPILE(
               [#include <sys/types.h>
-                #include <sys/socket.h>
+               #include <sys/socket.h>
 
                int getpeername (int, $arg2 *, $t *);],
-               [$t len;
+              [$t len;
                getpeername (0, 0, &len);],
               [gl_cv_socklen_t_equiv="$t"])
-             test "$gl_cv_socklen_t_equiv" != "" && break
+            test "$gl_cv_socklen_t_equiv" != "" && break
           done
-           test "$gl_cv_socklen_t_equiv" != "" && break
-         done
+          test "$gl_cv_socklen_t_equiv" != "" && break
+        done
       ])
       if test "$gl_cv_socklen_t_equiv" = ""; then
        AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
       fi
       AC_MSG_RESULT([$gl_cv_socklen_t_equiv])
       AC_DEFINE_UNQUOTED([socklen_t], [$gl_cv_socklen_t_equiv],
-        [type to use in place of socklen_t if not defined])],
+       [type to use in place of socklen_t if not defined])],
      [#include <sys/types.h>
       #if HAVE_SYS_SOCKET_H
       # include <sys/socket.h>
-      #endif
-      #if HAVE_WS2TCPIP_H
+      #elif HAVE_WS2TCPIP_H
       # include <ws2tcpip.h>
       #endif])])