Merge from gnulib.

[bpt/emacs.git] / m4 / socklen.m4

diff --git a/m4/socklen.m4 b/m4/socklen.m4
index 28dcf07..e3efd6e 100644 (file)
--- a/m4/socklen.m4
+++ b/m4/socklen.m4
@@ -1,5 +1,5 @@
-# socklen.m4 serial 9
-dnl Copyright (C) 2005-2007, 2009-2011 Free Software Foundation, Inc.
+# socklen.m4 serial 10
+dnl Copyright (C) 2005-2007, 2009-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -9,15 +9,11 @@ dnl From Albert Chin, Windows fixes from Simon Josefsson.
 dnl Check for socklen_t: historically on BSD it is an int, and in
 dnl POSIX 1g it is a type of its own, but some platforms use different
 dnl types for the argument to getsockopt, getpeername, etc.:
-dnl HP-UX 10.20, IRIX 6.5, Interix 3.5, BeOS.
+dnl HP-UX 10.20, IRIX 6.5, OSF/1 4.0, Interix 3.5, BeOS.
 dnl So we 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 sys_socket.in.h, which
-dnl all users of this module should include if they want to be portable to
-dnl mingw32.  Cygwin must not include ws2tcpip.h.
 AC_DEFUN([gl_TYPE_SOCKLEN_T],
-  [AC_REQUIRE([gl_PREREQ_TYPE_SOCKLEN_T])dnl
+  [AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])dnl
    AC_CHECK_TYPE([socklen_t], ,
      [AC_MSG_CHECKING([for socklen_t equivalent])
       AC_CACHE_VAL([gl_cv_socklen_t_equiv],
@@ -45,21 +41,37 @@ AC_DEFUN([gl_TYPE_SOCKLEN_T],
       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])],
-     [#include <sys/types.h>
-      #if HAVE_SYS_SOCKET_H
-      # include <sys/socket.h>
-      ]m4_ifdef([gl_SYS_SOCKET_H_DEFAULTS],
-         [#elif HAVE_WS2TCPIP_H
-          # include <ws2tcpip.h>]
-      )[#endif])])
+     [gl_SOCKET_HEADERS])])
+
+dnl On mingw32, socklen_t is in ws2tcpip.h ('int'), so we try to find
+dnl it there too.  But on Cygwin, wc2tcpip.h must not be included.  Users
+dnl of this module should use the same include pattern as gl_SOCKET_HEADERS.
+dnl When you change this macro, keep also in sync:
+dnl   - gl_CHECK_SOCKET_HEADERS,
+dnl   - the Include section of modules/socklen.
+AC_DEFUN([gl_SOCKET_HEADERS],
+[
+/* <sys/types.h> is not needed according to POSIX, but the
+   <sys/socket.h> in i386-unknown-freebsd4.10 and
+   powerpc-apple-darwin5.5 required it. */
+#include <sys/types.h>
+#if HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#elif HAVE_WS2TCPIP_H
+# include <ws2tcpip.h>
+#endif
+])
 
-AC_DEFUN([gl_PREREQ_TYPE_SOCKLEN_T],
+dnl Tests for the existence of the header for socket facilities.
+dnl Defines the C macros HAVE_SYS_SOCKET_H, HAVE_WS2TCPIP_H.
+dnl This macro must match gl_SOCKET_HEADERS.
+AC_DEFUN([gl_CHECK_SOCKET_HEADERS],
   [AC_CHECK_HEADERS_ONCE([sys/socket.h])
-   m4_ifdef([gl_SYS_SOCKET_H_DEFAULTS],
-     [if test $ac_cv_header_sys_socket_h = no; then
-        dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
-        dnl the check for those headers unconditional; yet cygwin reports
-        dnl that the headers are present but cannot be compiled (since on
-        dnl cygwin, all socket information should come from sys/socket.h).
-        AC_CHECK_HEADERS([ws2tcpip.h])
-      fi])])
+   if test $ac_cv_header_sys_socket_h = no; then
+     dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
+     dnl the check for those headers unconditional; yet cygwin reports
+     dnl that the headers are present but cannot be compiled (since on
+     dnl cygwin, all socket information should come from sys/socket.h).
+     AC_CHECK_HEADERS([ws2tcpip.h])
+   fi
+  ])