Buildbot failure in Wildebeest Builder on whole buildset

[Mark Wielaard]

Hi,

On Wed, 2021-05-05 at 20:03 +0000, buildbot@builder.wildebeest.org wrote:
> The Buildbot has detected a failed build on builder whole buildset while building debugedit.
> Full details are available at:
>     https://builder.wildebeest.org/buildbot/#builders/53/builds/14
> 
> Buildbot URL: https://builder.wildebeest.org/buildbot/
> 
> Worker for this Build: centos-x86_64
> 
> Build Reason: <unknown>
> Blamelist: Mark Wielaard <mark@klomp.org>
> 
> BUILD FAILED: failed compile (failure)

This was an interesting failure. Turns out that we were too clever with
our help2man dependencies. It might fail when we do a parallel build
because our recursive make invocation might clash with the running
parallel make one. The attached patch fixes it by a trick found in
guix. Now we do depend on the executables, but only invoke the help2man
rule if the dependency that changed wasn't the executable itself.

See attached.

Cheers,

Mark

P.S. Yes, there are still 3 buildbot workers that don't have help2man,
they are still failing. Will be fixed tomorrow.
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