X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fftruncate.m4;h=e71e99b40bcf8c4940d1d9eb68c121eb0b01f191;hb=cc3145bc3a0324d93fc8a9b7b7dcf5ea9f901b1e;hp=1be562ed9fb38d635a90f6c4346bdd51b02e09fd;hpb=27ef3b8633ec7b4aba91535ec51c43f39b42a25a;p=gnulib.git

diff --git a/m4/ftruncate.m4 b/m4/ftruncate.m4
index 1be562ed9..e71e99b40 100644
--- a/m4/ftruncate.m4
+++ b/m4/ftruncate.m4
@@ -1,27 +1,34 @@
-#serial 2
+#serial 10
 
-# See if we need to emulate a missing ftruncate function using fcntl.
+# See if we need to emulate a missing ftruncate function using fcntl or chsize.
 
-AC_DEFUN(jm_FUNC_FTRUNCATE,
-[
-  AC_CHECK_FUNCS(ftruncate, , [ftruncate_missing=yes])
+# Copyright (C) 2000, 2001, 2003-2006 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# FIXME: remove this macro, along with all uses of HAVE_FTRUNCATE in 2007,
+# if the check below provokes no reports.
 
-  if test "$ftruncate_missing" = yes; then
-    AC_CHECK_HEADERS(unistd.h)
-    AC_MSG_CHECKING([fcntl emulation of ftruncate])
-    AC_CACHE_VAL(fu_cv_sys_ftruncate_emulation,
-    [AC_TRY_LINK([
-#include <sys/types.h>
-#include <fcntl.h>], [
-#if !defined(F_CHSIZE) && !defined(F_FREESP)
-  chsize();
-#endif
-  ],
-      fu_cv_sys_ftruncate_emulation=yes,
-      fu_cv_sys_ftruncate_emulation=no)])
-    AC_MSG_RESULT($fu_cv_sys_ftruncate_emulation)
-    if test $fu_cv_sys_ftruncate_emulation = yes; then
-      AC_LIBOBJ(ftruncate)
+AC_DEFUN([gl_FUNC_FTRUNCATE],
+[
+  AC_REPLACE_FUNCS(ftruncate)
+  if test $ac_cv_func_ftruncate = no; then
+    gl_PREREQ_FTRUNCATE
+    # If someone lacks ftruncate, make configure fail, and request
+    # a bug report to inform us about it.
+    if test x"$SKIP_FTRUNCATE_CHECK" != xyes; then
+      AC_MSG_FAILURE([Your system lacks the ftruncate function.
+	  Please report this, along with the output of "uname -a", to the
+	  bug-coreutils@gnu.org mailing list.  To continue past this point,
+	  rerun configure with SKIP_FTRUNCATE_CHECK=yes.
+	  E.g., ./configure SKIP_FTRUNCATE_CHECK=yes])
     fi
   fi
 ])
+
+# Prerequisites of lib/ftruncate.c.
+AC_DEFUN([gl_PREREQ_FTRUNCATE],
+[
+  AC_CHECK_FUNCS(chsize)
+])