Re: [PATCH] Increase "Safety factor" when ARG_MAX is less than 40KB.

[Ralf Wildenhues]

Hi Peter,

* Peter O'Gorman wrote on Tue, Sep 02, 2008 at 05:50:33PM CEST:
> 
> On an hpux10.20 system with ARG_MAX at 20KB, we still got "Arg list too
> long" when linking. It worked when I edited the libtool script and set
> max_cmd_len to 10K instead of 15.
> 
> For systems with a large value of ARG_MAX, setting max_cmd_len to 75%
> still seems reasonable though.
> 
> Ok to push?

There is little reason to believe that the number of arguments that the
C++ driver adds, plus the size of the environment, scales linearly with
ARG_MAX[1].  So why not subtract a reasonable constant amount in the
first place?

Thanks,
Ralf

[1] except for the possibility that, for systems with very low limit,
the driver may put less things on the command line, or use something
like a response file anyway.

> >From 87f8effdad00f84ffdd27803ac01fbd0e64d935d Mon Sep 17 00:00:00 2001
> From: Peter O'Gorman <address@hidden>
> Date: Tue, 2 Sep 2008 10:43:52 -0500
> Subject: [PATCH] Increase "Safety factor" when ARG_MAX is less than 40KB.
> 
> * libltdl/m4/libtool.m4 (LT_CMD_MAX_LEN): set max_cmd_len to 50% of ARG_MAX 
> if ARG_MAX is < 40KB, otherwise, set to 75%.