Since this change, all (subsequent) CMake commands (after "%cmake")
MUST be used with the builddir argument ( "-B %{__cmake_builddir}" ).
I use in my packages "cmake -LAH" from time to time, to verify that
all CMake arguments (-D...) were passed and processed correctly, since
the processing logic behind each such argument can be quite
complicated.
Now (with the new CMake behaviour), when you call "cmake -LAH" after
you used the "%cmake", it will create a *new* cache, in the current
(that usually mean source) directory, *with incorrect values* and show
you that values instead of the correct ones (from the correct
builddir).
That was a nice quantum physic problem - since the new incorrect cache
was only created when you wanted to observe it :)
I'd like to anyone after me to not get caught by this (probably
correct, but not intuitive) behaviour.
I'd like to have the "%{__cmake_builddir}" and "%_vpath_builddir" more
visible, than hidden behind "See the Defining source and build
directories for more information".
I was on that page several times but I haven't clicked that link since
I was looking how to *get* the patch of the builddir, instead of
defining it.
I'd submit a PR, but unfortunately no good idea how to reword the
sentence has passed my mind yet.
--
Michal Schorm
Software Engineer
Core Services - Databases Team
Red Hat
--
On Tue, Aug 4, 2020 at 9:37 AM Igor Raits
<ignatenkobrain@xxxxxxxxxxxxxxxxx> wrote:
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA512
>
> On Mon, 2020-08-03 at 22:14 -0500, Richard Shaw wrote:
> > Sometimes you need to get into the build directory, in my case for
> > OpenColorIO I use help2man to generate some of the man pages.
> >
> > I had to rely on the power of Google/Gmail to find Neal's response to
> > one
> > of my earlier emails to find the answer again...
>
> https://docs.fedoraproject.org/en-US/packaging-guidelines/CMake/
>
> %__cmake_in_source_build
>
> Controls whether builds are done in-source (when defined) or out-
> of-source (when undefined). See the Defining source and build
> directories for more information.
>
> Links to:
> https://docs.fedoraproject.org/en-US/packaging-guidelines/vpath/
>
> Feel free to submit a PR to make it more visible.
>
> >
> > %{_vpath_builddir}
> >
> > But that begs the question, now that we have updated %cmake, and new
> > %cmake_build & %cmake_install, why is it %_vpath_builddir and not
> > %_cmake_builddir?
> >
> > Thanks,
> > Richard
> > _______________________________________________
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>
> - --
> Igor Raits <ignatenkobrain@xxxxxxxxxxxxxxxxx>
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> _______________________________________________
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