Conan build everything from source

[Qubasa]

Hello,

On NixOS the ELF loader has a different path, which makes pre-compiled binaries useless.
I would like to know how to build every dependency from source with conan? I tired conan install --build always but that didn't work.

[ilelann]

I think you can't.
I'm currently trying to do exactly that, after being unable to follow the official doc, which failed during conan steps too.

My attempt is here https://github.com/ilelann/IncludeOS.
DISCLAIMER :
Don't hope anything.
Tests don't even link. It's probably totally broken.
I will shamelessly amend the commit during progress, until it has any value.

I replaced conan with CMake's FetchContent.
Doing so, you discover stuff like : includeOS relies on a patched s2n, which is totally hidden by prebuilt packages.
I do refer to personal forks of dependencies to fix compilation: you can see them in the top level CMake file.
And change as you see fit.

My two cents.

[Qubasa]

Yeeeeah... I think I will skip on using IncludeOS. I am following this blog https://os.phil-opp.com on how to implement your own x64 kernel in Rust I think that's the better approach :-)

[ilelann]

Just in case someone else cares, a note on progress: https://github.com/ilelann/IncludeOS/tree/build_from_scratch
see commit msg for status, but basically:
clone, checkout build_from_scratch, open in CLion/QtCreator/etc (any CMake aware IDE, with clang toolchain), run tests => OK
(and to build it will download/build musl, llvm, gsl, etc. ... so be patient :) )

I will continue amending until I have anything bootable.
For now the only feat is that all tests are standalone executables.
(in other words, ldd will print "is not a dynamic executable").
And what I did with "_mockable"-suffixed libs is definitely dirty.
I will try to clean that, but previous CMake setup was arguable too, IMHO.

[Qubasa]

Cool, thanks for your work!
I would still really recommend to follow the blog, I have a working kernel right now and soon with async support
plus you learn so much more ;)