Add --allowerasing, which will downgrades some packets in order to
satisfy LLVM dependencies.
When building the docker image for clang, CI fails with
Error:
Problem: llvm-18.1.8-3.el9.i686 from ubi-9-appstream-rpms does not belong to a distupgrade repository
- package llvm-toolset-18.1.8-3.el9.x86_64 from ubi-9-appstream-rpms requires llvm = 18.1.8, but none of the providers can be installed
- package llvm-18.1.8-3.el9.x86_64 from ubi-9-appstream-rpms requires llvm-libs(x86-64) = 18.1.8-3.el9, but none of the providers can be installed
- package llvm-18.1.8-3.el9.x86_64 from ubi-9-appstream-rpms requires libLLVM.so.18.1()(64bit), but none of the providers can be installed
- package llvm-18.1.8-3.el9.x86_64 from ubi-9-appstream-rpms requires libLLVM.so.18.1(LLVM_18.1)(64bit), but none of the providers can be installed
- cannot install both llvm-libs-18.1.8-3.el9.x86_64 from ubi-9-appstream-rpms and llvm-libs-19.1.7-2.el9.x86_64 from @System
- package mesa-dri-drivers-24.2.8-2.el9_6.x86_64 from @System requires libLLVM.so.19.1()(64bit), but none of the providers can be installed
- package mesa-dri-drivers-24.2.8-2.el9_6.x86_64 from @System requires libLLVM.so.19.1(LLVM_19.1)(64bit), but none of the providers can be installed
- package mesa-libGL-24.2.8-2.el9_6.x86_64 from @System requires libgallium-24.2.8.so()(64bit), but none of the providers can be installed
- package mesa-libGL-24.2.8-2.el9_6.x86_64 from @System requires libgallium-24.2.8.so(libgallium-24.2.8.so)(64bit), but none of the providers can be installed
- package mesa-libGL-devel-24.2.8-2.el9_6.x86_64 from @System requires mesa-libGL(x86-64) = 24.2.8-2.el9_6, but none of the providers can be installed
- conflicting requests
- problem with installed package mesa-libGL-devel-24.2.8-2.el9_6.x86_64
(try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)
So when trying to install llvm-toolset from docker/Dockerfile.clang.rhel9,
we have a conflict because this installs 18.1 from ubi-9-appstream-rpms,
but various mesa packets have llvm 19.1.
1. I don't understand why we have mesa installed (no graphics system?)
2. --allowerasing downgrades the relevent mesa package(s)
Alternatively, we would need to select 19.1 when installing
llvm-toolset, but I don't know how to do that.
Some users of the OAI CI complain that since we build with -Werror, it
is difficult to see all warnings/errors and fix them, necessitating
multiple attempts at times to see all warnings. To allow them to see
more warnings, use ninja option -k10 to keep going after errors, and
show more errors at once.
The clang build fails with
/oai-ran/openair1/PHY/MODULATION/gen_75KHz.cpp:16:23: error: variable length arrays in C++ are a Clang extension [-Werror,-Wvla-cxx-extension]
16 | complex<double> t[len];
| ^~~
/oai-ran/openair1/PHY/MODULATION/gen_75KHz.cpp:16:23: note: function parameter 'len' with unknown value cannot be used in a constant expression
So ignore this warning (and make the build pass), since OAI uses VLAs in
various places.
We disable for two reasons:
- in the CI, with clang, it did not build once, but I cannot reproduce
locally (even with clang)
- we want to maintain to be able to build without T tracer, so in one
pipeline, we have to build without it. What a lucky coincidence!
Robert Schmidt