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Re: Potential bug with my --synclines

From: Eric Blake
Subject: Re: Potential bug with my --synclines
Date: Thu, 6 Jun 2019 15:45:37 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 6/6/19 2:47 PM, Laura Wills wrote:
> Hi,
> I am running into an issue with m4 synclines. I have a list of m4 files which 
> point to child m4 files. This reaches a hierarchy level of 12. When I write 
> out a list of these m4 files and one at a time read them with m4 synclines I 
> am able to read them without an issue. When I put this into a recursive loop 
> at some point m4 synclines stops returning any value. The return code does 
> show that an error is occurring, but I cannot determine what the issue is. I 
> have tried the different -debug options, and have had no luck.
> In the recursive function I am getting a list of all included m4 files at the 
> current level, writing them to a file, and then closing that file. Once the 
> file is closed, I recursively call the function on the new list of m4 files.  
> I am using perl `m4 -synclines $infile > $output`.

Can you post actual contents of (a reduced) $infile that reproduce the
problem? The issue doesn't sound familiar, but I cannot decipher your
prose into a reproducible case nearly as fast as I could inspect your
input files to see if there was an obvious problem either in your input
files or in m4 itself.

> The version of m4 I am using is 1.4.13. I am running on RHEL6.
> Is this a known issue?
> Thanks,
> Laura

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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