X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Flibunistring.m4;h=c1bf4d553f9de1c69a5dd975b16b5ce95cce9cb5;hb=0d37a2e60081400c4ecefbb106e8a1749b3de2b0;hp=7a10efec790b40167d9d33bd9707f5383dd662cf;hpb=1495c20d059a7bf8cae0ad51bc576f4c458674e1;p=gnulib.git

diff --git a/m4/libunistring.m4 b/m4/libunistring.m4
index 7a10efec7..c1bf4d553 100644
--- a/m4/libunistring.m4
+++ b/m4/libunistring.m4
@@ -1,5 +1,5 @@
-# libunistring.m4 serial 6
-dnl Copyright (C) 2009-2010 Free Software Foundation, Inc.
+# libunistring.m4 serial 11
+dnl Copyright (C) 2009-2012 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.
@@ -12,9 +12,27 @@ dnl augments the CPPFLAGS variable, and #defines HAVE_LIBUNISTRING to 1.
 dnl Otherwise, it sets and AC_SUBSTs HAVE_LIBUNISTRING=no and LIBUNISTRING and
 dnl LTLIBUNISTRING to empty.
 
-AC_DEFUN([gl_LIBUNISTRING],
+dnl Define gl_LIBUNISTRING using AC_DEFUN_ONCE for Autoconf >= 2.64, in order
+dnl to avoid warnings like
+dnl "warning: AC_REQUIRE: `gl_LIBUNISTRING' was expanded before it was required".
+dnl This is tricky because of the way 'aclocal' is implemented:
+dnl - It requires defining an auxiliary macro whose name ends in AC_DEFUN.
+dnl   Otherwise aclocal's initial scan pass would miss the macro definition.
+dnl - It requires a line break inside the AC_DEFUN_ONCE and AC_DEFUN expansions.
+dnl   Otherwise aclocal would emit many "Use of uninitialized value $1"
+dnl   warnings.
+m4_define([gl_libunistring_AC_DEFUN],
+  m4_version_prereq([2.64],
+    [[AC_DEFUN_ONCE(
+        [$1], [$2])]],
+    [m4_ifdef([gl_00GNULIB],
+       [[AC_DEFUN_ONCE(
+           [$1], [$2])]],
+       [[AC_DEFUN(
+           [$1], [$2])]])]))
+gl_libunistring_AC_DEFUN([gl_LIBUNISTRING],
 [
-  AC_BEFORE([$0], [gl_LIBUNISTRING_LIBSOURCE])
+  AC_BEFORE([$0], [gl_LIBUNISTRING_MODULE])
   AC_BEFORE([$0], [gl_LIBUNISTRING_LIBHEADER])
   AC_BEFORE([$0], [gl_LIBUNISTRING_LIB_PREPARE])
 
@@ -88,9 +106,10 @@ AC_DEFUN([gl_LIBUNISTRING_CORE],
        dnl Use other tests to distinguish them.
        if test $gl_libunistring_hexversion = 9; then
          dnl Version 0.9.2 introduced the header <unistring/cdefs.h>.
-         AC_TRY_COMPILE([#include <unistring/cdefs.h>], ,
+         AC_COMPILE_IFELSE(
+           [AC_LANG_PROGRAM([[#include <unistring/cdefs.h>]], [[]])],
            [gl_cv_libunistring_version092=true],
-           [gl_cv_libunistring_version092=false]);
+           [gl_cv_libunistring_version092=false])
          if $gl_cv_libunistring_version092; then
            dnl Version 0.9.3 changed a comment in <unistr.h>.
            gl_ABSOLUTE_HEADER_ONE([unistr.h])
@@ -104,8 +123,11 @@ AC_DEFUN([gl_LIBUNISTRING_CORE],
            fi
          else
            dnl Version 0.9.1 introduced the type casing_suffix_context_t.
-           AC_TRY_COMPILE([#include <unicase.h>
-                           casing_suffix_context_t ct;], ,
+           AC_COMPILE_IFELSE(
+             [AC_LANG_PROGRAM(
+                [[#include <unicase.h>
+                  casing_suffix_context_t ct;]],
+                [[]])],
              [gl_cv_libunistring_version091=true],
              [gl_cv_libunistring_version091=false])
            if $gl_cv_libunistring_version091; then