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Re: VC and too long command lines

From: Nix
Subject: Re: VC and too long command lines
Date: Fri, 22 Jul 2011 21:37:50 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

On 21 Jul 2011, Eli Zaretskii said:

>> Date: Thu, 21 Jul 2011 16:16:17 +0200
>> From: Deniz Dogan <address@hidden>
>> Do you happen to know of any reliable way to determine the maximum
>> command line length of the user system?
> There isn't any, AFAIK.

There is, but it's time-consuming. Repeatedly retry a longer and longer
harmless command until one fails. (libtool does it.)

(Note that just because a command succeeds doesn't mean a later one
won't fail: many Unix systems have a fixed length for
cmdline+environment, so if the environment grows then the command-line
space necessarily must shrink. So this probably isn't actually much use
because it means we can't check in advance, and it's too slow to check
at the time. I suppose we could check in advance, and only recheck if
someone calls `setenv'...)

NULL && (void)

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