#35519 - Rust (and librsvg, IceCat, etc.) fails to build on i686-linux

Package	Source(s)		Maintainer(s)
guix		PTS Buildd Popcon

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From: Mark H Weaver <mhw@netris.org>
To: Danny Milosavljevic <dannym@scratchpost.org>
Subject: Re: bug#35519: librsvg broken on i686-linux
References: <871s1ion48.fsf@netris.org> <87h8a2sc6j.fsf@elephly.net>
 <20190511020026.4d207749@scratchpost.org>
Date: Sat, 11 May 2019 04:03:41 -0400
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Hi Danny,

Danny Milosavljevic <dannym@scratchpost.org> writes:

> But when I use our separate package definitions it fails when building libcore
> (which is the first library for the target compiler).
> Invoke seems to swallow the output, so I have no idea where or why it failed
> (grr).

Hmm.  What makes you think that 'invoke' swallowed the output?  You
might be right, but 'invoke' is used quite widely by now in Guix,
including to invoke 'make' in gnu-build-system, and I haven't seen
reports of it swallowing output.

I looked at the code.  'invoke' calls 'system*' which calls
'scm_open_process' (in libguile/posix.c) with an empty mode string.

In this case, the child STDOUT becomes (current-output-port) from the
parent if (current-output-port) is a "file port", i.e. a Guile port
backed by a POSIX file descriptor, e.g. a file, socket or pipe.  If it's
a Guile port that's not backed by a file descriptor, e.g. a custom port,
soft port, string port, bytevector port, etc, then indeed the child
output will go to /dev/null instead.

(Note that the port returned by 'open-pipe*' when used in OPEN_BOTH mode
is also a soft port and not considered a file port, even though it is
internally backed by two file ports.)

Ditto for STDERR, except that it uses (current-error-port).

So, if 'invoke' seems to be swallowing output, it's probably because it
was called within the dynamic extent of 'with-output-to-port',
'with-error-to-port', 'with-output-to-string', or similar.

     Regards,
       Mark

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#35519 Rust (and librsvg, IceCat, etc.) fails to build on i686-linux