[Bug 64285] telepathy gabble 0.17.3 fails on parallel build

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=64285

Simon McVittie <simon.mcvittie at collabora.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|telepathy-bugs at lists.freede |simon.mcvittie at collabora.co
                   |sktop.org                   |.uk

--- Comment #2 from Simon McVittie <simon.mcvittie at collabora.co.uk> ---
Created attachment 80222
  --> https://bugs.freedesktop.org/attachment.cgi?id=80222&action=edit
Avoid having two of the same set of commands run in  parallel

A rule like this:

    _gen/x.c _gen/x.h: prerequisites
        $(AM_V_GEN)x-generator

doesn't consider x.c and x.h together. Instead, it expands to two rules,
one to generate x.c and one to generate x.h, which happen to run the
same commands.

This means that in the worst case, you can end up running x-generator
twice in parallel, and they'll race with each other and overwrite or
delete each other's output.

Based on commit 36c2a545c from telepathy-glib.

---

We should fix this in all the other CMs, too.

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