On 03/01/2018 11:33 AM, Paul Howarth wrote:
On Thu, 1 Mar 2018 11:17:18 +0100
Petr Pisar <ppi...@redhat.com> wrote:

On Thu, Mar 01, 2018 at 09:38:08AM +0100, Ralf Corsepius wrote:
Hi,

perl-Plack fails to build in rawhide with
this error[1]

Sorry, of course this was perl-Server-Starter, not perl-Plack.

...
+ /usr/bin/perl Build.PL --installdirs=vendor
Can't locate ExtUtils/CBuilder.pm in @INC (you may need to install
the ExtUtils::CBuilder module) (@INC contains:
/builddir/build/BUILD/Server-Starter-0.34/_build/lib /usr/local/lib64/perl5
/usr/local/share/perl5 /usr/lib64/perl5/vendor_perl
/usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at
/usr/share/perl5/vendor_perl/Module/Build/Base.pm line 5295.
...

f26, f27 and f28 build fine.

What is going on here? perl-Plack does not carry any direct
dependency on ExtUtils::CBuilder, so my guess would be a dependency
is missing somewhere else.
<https://lists.fedoraproject.org/archives/list/perl-devel@lists.fedoraproject.org/message/MWK6MLOWOIJ2UVMRILR3FAZZRE3X6OCM/>
is happennning due to GCC removal from F29 build root.

If you have a package with XS modules and use Module::Build, you need
to build-require ExtUtils::CBuilder.

In case of Server-Starter, there seems to be a bug in
Module::Build::Base. It invokes auto_require() that for some reason
has $self->c_source set to [], and thus it decides it needs a
compiler and hence ExtUtils::CBuilder.

I think this condition in auto_require() should be corrected:

     $self->needs_compiler( keys %$xs_files || defined
$self->c_source );

and also the reason why $self->c_source is [] instead of undef should
be investigated.

That'll be because Server-Starter's Build.PL has

  "c_source     => [qw()],"

And that's generated by Minilla, so all non-XS Minilla-based dists are
likely to be affected.
I am not familiar with Minilla, but you seem to have a point. At least, removing this line from Build.PL lets building perl-Server-Starter succeed for rawhide:
https://koji.fedoraproject.org/koji/taskinfo?taskID=25390138

Ralf
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