There have been a number of PRs[1] opened to workaround problems
with pkg-config not finding .pc files when dependencies have
been built in flatpak context.
Normally pkg-config would always find .pc files in any system
dirs. ie
/usr/local/lib64/pkgconfig
/usr/local/share/pkgconfig
/usr/lib64/pkgconfig
/usr/share/pkgconfig
but when a package is built as a flatpak, there are additional
system dirs defined
/app/lib64/pkgconfig
/app/share/pkgconfig
and an apps' .pc files go into /app, rather than /usr.
pkg-config / pkgconf is not searching those by default.
flatpkg-rpm-macros overrides the definition of %___build_pre
to set PKG_CONFIG_PATH to point to the /app tree.
This only works when cases where pkg-config is invoked under
the RPM %build section. Fine for the normal build process
stage.
It fails, though, if an RPM spec needs to call pkg-config
separately from %build. eg if doing
%define wireshark_plugindir %(pkg-config --variable plugindir wireshark)/epan
The proposed fix in the PRs is to add a call to %___build_pre
for any invokation of 'pkg-config' in spec files.
Functionally that works, but to me this feels like a suboptimal
approach.
I tend to view /app/{lib64,share}/pkgconfig as being standard
system libdirs, and thus would expect pkg-config to automatically
search them, without requiring PKG_CONFIG_PATH to be set.
Is there a reason we can't build pkgconfig such that it includes
the /app dirs out of the box.
AFAICT, such a change should not negatively affect normal Fedora
builds since the /app dirs won't exist, and would make pkg-config
"do the right thing" in Flatpak context, avoiding whack-a-mole
fixing of RPMs to call %___build_pre
Incidentally is %___build_pre a macro we can rely on long term ?
Is there any rule for what the different number of leading "_"
mean in macros ? ie are macros with three leading _ still fair
game to reference in specs, or are they considered an unstable
impl detail that's subject to change ?
With regards,
Daniel
[1] Two examples
https://src.fedoraproject.org/rpms/libvirt/pull-request/26
https://src.fedoraproject.org/rpms/gmic/pull-request/3
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