Add option to decide output directory for CMake.

[gsa-tspaere]

Hey!

I am using pixi-build with a cmake project, and I'm able to build it and everything, but I have a problem. I use compile_commands.json to use clangd in my editor, and I'm dependent on the output of the cmake build is in a predictable place, to be order to point it there.

For now I see no option to direct pixi, to do the building in a given directory. Is there anyway you could add support for this or some other special option to get the compile_commands.json out?

[tdejager]

Yes! We can add the -DCMAKE_EXPORT_COMPILE_COMMANDS=ON option by default I think. Thank for giving this a test drive 🚗 🚤 !

[gsa-tspaere]

Adding it by default is good, but the main problem is that we need some way to place it in a fixed place, so the user can point their clangd configuration to it :)

[tdejager]

Yeah, indeed, so I don't know how you are using it, but we do re-use the build directory in the the .pixi folder :) the problem is that can dissappear whenever the backend decides but we could give that a first try maybe?

[tdejager]

We've just merged: #51

Might be fun to give that a try with the next pixi release :)

[gsa-tspaere]

Hey, that's very nice! Could you give me the name of the folder that is used for the build?

[tdejager]

It should be in .pixi/build-v0/ and then the name of your project and some string. E.g for its this for some project:

.pixi/build-v0/cpp-sdl-rxtTGpY4RzI/bld/rattler-build_sdl_example/build

This contains the compile_commands.json.

It should re-use this folder across builds.

[gsa-tspaere]

Hey! I will look into this, when I last looked, I was not able to find those files, but I am sure it was just me!