[PATCH] master: build: avoid ignored errors.

[Akim Demaille]

        * doc/local.mk ($(CROSS_OPTIONS_TEXI)): Don't generate ignored
        errors, they pollute the output.
---
 ChangeLog    |    6 ++++++
 doc/local.mk |   15 +++++++++------
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 34cb6fe..14eb499 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2009-05-25  Akim Demaille  <address@hidden>
+
+       build: avoid ignored errors.
+       * doc/local.mk ($(CROSS_OPTIONS_TEXI)): Don't generate ignored
+       errors, they pollute the output.
+
 2009-05-22  Joel E. Denny  <address@hidden>
 
        Convert multiple variable definition warnings to complaints.
diff --git a/doc/local.mk b/doc/local.mk
index d139790..cf68a98 100644
--- a/doc/local.mk
+++ b/doc/local.mk
@@ -1,5 +1,5 @@
-## Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007, 2008 Free Software
-## Foundation, Inc.
+## Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009
+## Free Software Foundation, Inc.
 
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -29,11 +29,14 @@ clean-local:
 CROSS_OPTIONS_PL = $(top_srcdir)/build-aux/cross-options.pl
 CROSS_OPTIONS_TEXI = $(top_srcdir)/doc/cross-options.texi
 $(CROSS_OPTIONS_TEXI): $(top_srcdir)/src/getargs.c $(CROSS_OPTIONS_PL)
-       mv -f $@ address@hidden || : >address@hidden
-       -rm -f address@hidden
+# Create address@hidden which is the previous contents.  Don't use `mv' here so
+# that even if we are interrupted, the file is still available for
+# diff in the next run.  Note that $@ might not exist yet.
+       { test ! -f $@ || cat $@; } >address@hidden
+       test ! -f address@hidden || rm -f address@hidden
        $(MAKE) $(AM_MAKEFLAGS) src/bison$(EXEEXT)
-       $(top_builddir)/src/bison --help |                              \
-       perl $(CROSS_OPTIONS_PL) $(top_srcdir)/src/scan-gram.l >address@hidden
+       $(top_builddir)/src/bison --help |                               \
+         perl $(CROSS_OPTIONS_PL) $(top_srcdir)/src/scan-gram.l >address@hidden
        diff -u address@hidden address@hidden || true
        mv address@hidden $@
 MAINTAINERCLEANFILES = $(CROSS_OPTIONS_TEXI)
-- 
1.6.3