On Sat, Mar 30, 2024 at 10:15:47PM +0000, Zbigniew Jędrzejewski-Szmek wrote:
> One particular issue I have with CMake as a downstream maintainer is
> it's often very hard to override linking or compilation options
> or when the project is using one of the cmake find scripts that gets
> something wrong… It's possible that those projects are "doing cmake wrong",
> but it seems that CMake makes it easy to do things wrong.
I just had to interact with CMake, so let's use that as example:
I'm rebuilding rpm.rpm with some local patches using 'fedpkg local' in F40.
The build fails with:
Directory not found: /home/zbyszek/rpmbuild/BUILDROOT/rpm-4.19.1.1-2.fc41.x86_64/usr/lib64/python3.12/site-packages/rpm
Hmm, why? Oh, rpm uses cmake, and cmake has it's own special detection of
python, and it found /usr/bin/python3.13t that I have installed, and subsequently
it got all the paths wrong. How do I override this?
('cmake -LAH' doesn't yield anything useful.)
(When compiling a python module, any other alternative would be better.
The build uses %python3, i.e. /usr/bin/python3.12, so there's no need
to detect anything, the location of python is known and all this binary
can be called to print all paths. Otherwise, either call
'python3-config' or 'pkgconf python', don't do you own reimplementation.)
Zbyszek
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