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Re: ensure a VPATH build
From: |
Ralf Wildenhues |
Subject: |
Re: ensure a VPATH build |
Date: |
Tue, 21 Feb 2006 13:32:34 +0100 |
User-agent: |
Mutt/1.5.11 |
Hi Keith,
* Keith MARSHALL wrote on Tue, Feb 21, 2006 at 12:50:18PM CET:
>
[ lots of explanations ]
Thanks!
> Ralf Wildenhues wrote, quoting me:
> > BTW, in the patch [snipped], the
> > >> $REFFILE
> > looks problematic to me. What is it supposed to do?
>
> I've never encountered a shell which has trouble with this idiom
> for touching a file, leaving it unmodified if it already exists, or
> creating it (empty) if it doesn't; (even MS-DOS' command.com can
> handle it, in the form `>> %REFFILE%', in its .bat language). I
> won't change this, unless you can provide evidence of a specific
> arena in which it fails.
Some zsh versions have NULLCMD set to `cat' by default, so the command
will be equivalent to
cat >> $REFFILE
and thus will read from stdin until EOF. If stdin is connected to the
terminal, the innocent user will think the program hangs; if it points
to an open file, that file will end up in $REFFILE.
Quoting relevant parts of (CVS) autoconf.info:
| Zsh
| To detect whether you are running `zsh', test whether
| `ZSH_VERSION' is set. By default `zsh' is _not_ compatible with
| the Bourne shell: you must execute `emulate sh', and for `zsh'
| versions before 3.1.6-dev-18 you must also set `NULLCMD' to `:'.
| *Note Compatibility: (zsh)Compatibility, for details.
|
| The default Mac OS X `sh' was originally Zsh; it was changed to
| Bash in Mac OS X 10.2.
| `NULLCMD'
| When executing the command `>foo', `zsh' executes `$NULLCMD >foo'
| unless it is operating in Bourne shell compatibility mode and the
| `zsh' version is newer than 3.1.6-dev-18. If are using an older
| `zsh' and forget to set `NULLCMD', your script might be suspended
| waiting for data on its standard input.
Cheers,
Ralf
- Re: ensure a VPATH build, (continued)
- Re: ensure a VPATH build, Ralf Wildenhues, 2006/02/18
- Re: ensure a VPATH build, Keith Marshall, 2006/02/18
- Re: ensure a VPATH build, Ralf Wildenhues, 2006/02/18
- Re: ensure a VPATH build, Keith Marshall, 2006/02/18
- double-quoted command substitutions (was: ensure a VPATH build), Ralf Wildenhues, 2006/02/18
- Re: double-quoted command substitutions (was: ensure a VPATH build), Keith Marshall, 2006/02/18
- Re: ensure a VPATH build, Keith Marshall, 2006/02/18
- Re: ensure a VPATH build, Andreas Schwab, 2006/02/18
- Re: ensure a VPATH build, Ralf Wildenhues, 2006/02/19
- Re: ensure a VPATH build, Keith MARSHALL, 2006/02/21
- Re: ensure a VPATH build,
Ralf Wildenhues <=
- Possible zsh contention in pdfroff (Re: [autoconf] ensure a VPATH build), Keith MARSHALL, 2006/02/21
- Re: [Groff] Possible zsh contention in pdfroff (Re: [autoconf] ensure a VPATH build), Pedro A. López-Valencia, 2006/02/22
- Re: ensure a VPATH build, Andreas Schwab, 2006/02/18
- Re: ensure a VPATH build, Julien Lecomte, 2006/02/19
- Re: ensure a VPATH build, Ralf Wildenhues, 2006/02/19
- Re: ensure a VPATH build, Julien Lecomte, 2006/02/19
- Re: ensure a VPATH build, Ralf Wildenhues, 2006/02/19