[Bug gold/23620] New: [gold] Support jobserver with --threads

[romain.geissler at amadeus dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23620

            Bug ID: 23620
           Summary: [gold] Support jobserver with --threads
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: romain.geissler at amadeus dot com
                CC: ian at airs dot com
  Target Milestone: ---

Hi,

The current gold implementation tries to create by default as many threads as
the number of inputs, which can lead on big projects to EAGAIN error when
calling pthread_create.

An alternative is to define --thread-count, however this also scale poorly when
you build in parallel several big binaries and each of them eat N threads.

Would it be possible to implement a jobserver inside gold, similar to what can
be found  in gcc with -flto=jobserver. GNU Make describes how a jobserver aware
tool shall behave:
https://www.gnu.org/software/make/manual/html_node/POSIX-Jobserver.html

Cheers,
Romain

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