FYI: ftruncate tests are on the way out, maybe

[Jim Meyering]

Since ftruncate has been used unconditionally in shred since 1999,
this seems like a safe bet.  I suspect it'll eventually be ok to
remove the SysV-ish lib/ftruncate.c, as well.

I've just made this change in coreutils (trunk, not branch):

2006-06-18  Jim Meyering  <address@hidden>

        * ftruncate.m4 (gl_FUNC_FTRUNCATE): If ftruncate is missing, make
        configure fail, and request a bug report to inform us about it.
        Add a comment that, barring reports to the contrary, in 2007 we'll
        assume ftruncate is universally available.

Index: m4/ftruncate.m4
===================================================================
RCS file: /fetish/cu/m4/ftruncate.m4,v
retrieving revision 1.9
diff -u -p -r1.9 ftruncate.m4
--- m4/ftruncate.m4     22 Sep 2005 06:05:39 -0000      1.9
+++ m4/ftruncate.m4     18 Jun 2006 13:46:00 -0000
@@ -1,17 +1,29 @@
-#serial 8
+#serial 9
 
 # See if we need to emulate a missing ftruncate function using fcntl or chsize.
 
-# Copyright (C) 2000, 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
+# 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.
+
 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
+         address@hidden mailing list.  To continue past this point,
+         rerun configure with SKIP_FTRUNCATE_CHECK=yes set in the environment.
+         E.g., env SKIP_FTRUNCATE_CHECK=yes ./configure])
+    fi
   fi
 ])