X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fmemcmp.m4;h=c0e9265dac0fbc236324ce9eb2132652463f509c;hb=0167c1923d0791e0e1491a856292b0945621c4e2;hp=2d9258165ed6612b203bc9e73ad7111f97b88b33;hpb=a965c0038c4b72af2497d3ec44aeb4587c2478d5;p=gnulib.git

diff --git a/m4/memcmp.m4 b/m4/memcmp.m4
index 2d9258165..c0e9265da 100644
--- a/m4/memcmp.m4
+++ b/m4/memcmp.m4
@@ -1,48 +1,31 @@
-#serial 5
+# memcmp.m4 serial 14
+dnl Copyright (C) 2002-2004, 2007-2010 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
 
-dnl A replacement for autoconf's AC_FUNC_MEMCMP that detects
-dnl the losing memcmp on some x86 Next systems.
-AC_DEFUN(jm_AC_FUNC_MEMCMP,
-[AC_CACHE_CHECK([for working memcmp], jm_cv_func_memcmp_working,
-[AC_TRY_RUN(
-[int
-main ()
-{
-  /* Some versions of memcmp are not 8-bit clean.  */
-  char c0 = 0x40, c1 = 0x80, c2 = 0x81;
-  if (memcmp(&c0, &c2, 1) >= 0 || memcmp(&c1, &c2, 1) >= 0)
-    exit (1);
-
-  /* The Next x86 OpenStep bug shows up only when comparing 16 bytes
-     or more and with at least one buffer not starting on a 4-byte boundary.
-     William Lewis provided this test program.   */
-  {
-    char foo[21];
-    char bar[21];
-    int i;
-    for (i = 0; i < 4; i++)
-      {
-	char *a = foo + i;
-	char *b = bar + i;
-	strcpy (a, "--------01111111");
-	strcpy (b, "--------10000000");
-	if (memcmp (a, b, 16) >= 0)
-	  exit (1);
-      }
-    exit (0);
-  }
-}],
-   jm_cv_func_memcmp_working=yes,
-   jm_cv_func_memcmp_working=no,
-   jm_cv_func_memcmp_working=no)])
-test $jm_cv_func_memcmp_working = no \
-  && AC_LIBOBJ([memcmp])
+AC_DEFUN([gl_FUNC_MEMCMP],
+[
+  if test $cross_compiling != no; then
+    # AC_FUNC_MEMCMP as of 2.62 defaults to 'no' when cross compiling.
+    # We default to yes if memcmp appears to exist, which works
+    # better for MinGW.
+    AC_CACHE_CHECK([whether cross-compiling target has memcmp],
+                   [ac_cv_func_memcmp_working],
+                   [AC_LINK_IFELSE([
+                        AC_LANG_PROGRAM([[#include <string.h>
+                                ]], [[int ret = memcmp ("foo", "bar", 0);]])],
+                        [ac_cv_func_memcmp_working=yes],
+                        [ac_cv_func_memcmp_working=no])])
+  fi
+  AC_FUNC_MEMCMP
+  dnl Note: AC_FUNC_MEMCMP does AC_LIBOBJ([memcmp]).
+  if test $ac_cv_func_memcmp_working = no; then
+    AC_DEFINE([memcmp], [rpl_memcmp],
+      [Define to rpl_memcmp if the replacement function should be used.])
+    gl_PREREQ_MEMCMP
+  fi
 ])
 
-AC_DEFUN(jm_FUNC_MEMCMP,
-[AC_REQUIRE([jm_AC_FUNC_MEMCMP])dnl
- if test $jm_cv_func_memcmp_working = no; then
-   AC_DEFINE_UNQUOTED(memcmp, rpl_memcmp,
-     [Define to rpl_memcmp if the replacement function should be used.])
- fi
-])
+# Prerequisites of lib/memcmp.c.
+AC_DEFUN([gl_PREREQ_MEMCMP], [:])