* Akim Demaille wrote on Tue, Jan 04, 2005 at 10:45:17AM CET:
> >>> "Ralf" == Ralf Wildenhues <Ralf.Wildenhues@xxxxxx> writes:
>
> > Might be nice to have the information reusable as well
> > (--config comes to mind). See below.
>
> The idea is nice, but the way to use --config should be documented: in
> particular how to split properly the output when some arguments
> include spaces and other special characters.
How about this patch, with autoconf.texi slightly updated?
Regards,
Ralf
* lib/autoconf/status.m4 (_AC_OUTPUT_CONFIG_STATUS): New option
`--config' for config.status, to output the configuration command
suitable for reuse with `eval'.
* doc/autoconf.texi (config.status Invocation): Document it.
Index: doc/autoconf.texi
===================================================================
RCS file: /cvsroot/autoconf/autoconf/doc/autoconf.texi,v
retrieving revision 1.861
diff -u -r1.861 autoconf.texi
--- doc/autoconf.texi 4 Jan 2005 23:50:01 -0000 1.861
+++ doc/autoconf.texi 5 Jan 2005 10:22:44 -0000
@@ -13506,6 +13506,32 @@
@itemx -V
Print the version number of Autoconf and exit.
+@item --config
+Print the command to recreate the current configuration.
+The output is quoted such that it is reusable for a shell within @code{eval}:
+
+@example
+eval `./config.status --config`
+@end example
+
+is synonymous to
+
+@example
+./config.status --recheck && ./config.status
+@end example
+
+and recreates the current configuration. To create a new build tree with
+a slightly modified configuration, commands like
+
+@example
+mkdir build-debug && cd build-debug
+eval set `../build-opt/config.status --config`
+shift
+path/to/configure "$@@" CFLAGS="-g"
+@end example
+
+could be used.
+
@item --silent
@itemx --quiet
@itemx -q
Index: lib/autoconf/status.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/lib/autoconf/status.m4,v
retrieving revision 1.48
diff -u -r1.48 status.m4
--- lib/autoconf/status.m4 21 Dec 2004 14:24:01 -0000 1.48
+++ lib/autoconf/status.m4 5 Jan 2005 10:22:44 -0000
@@ -1348,6 +1348,7 @@
-h, --help print this help, then exit
-V, --version print version number, then exit
+ --config print configuration
-q, --quiet do not print progress messages
-d, --debug don't remove temporary files
--recheck update $as_me by reconfiguring in the same conditions
@@ -1384,11 +1385,13 @@
_ACEOF
cat >>$CONFIG_STATUS <<_ACEOF
+ac_cs_configure="$[0]"
+ac_cs_config="`echo "$ac_configure_args" | sed 's/[[\\""\`\$]]/\\\\&/g'`"
ac_cs_version="\\
m4_ifset([AC_PACKAGE_NAME], [AC_PACKAGE_NAME ])config.status[]dnl
m4_ifset([AC_PACKAGE_VERSION], [ AC_PACKAGE_VERSION])
-configured by $[0], generated by m4_PACKAGE_STRING,
- with options \\"`echo "$ac_configure_args" | sed 's/[[\\""\`\$]]/\\\\&/g'`\\"
+configured by \$ac_cs_configure, generated by m4_PACKAGE_STRING,
+ with options \\"\$ac_cs_config\\"
Copyright (C) 2004 Free Software Foundation, Inc.
This config.status script is free software; the Free Software Foundation
@@ -1432,6 +1435,8 @@
ac_cs_recheck=: ;;
--version | --vers* | -V )
echo "$ac_cs_version"; exit 0 ;;
+ --config | --conf* )
+ echo "$ac_cs_configure $ac_cs_config"; exit 0 ;;
--he | --h)
# Conflict between --help and --header
AC_MSG_ERROR([ambiguous option: $[1]
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