Comments (7)
Maybe we could build a handful of defconfigs with an
llvm
build environment, as well as the currentclang
ones?
An "all LLVM tools" option now exists by setting LLVM=1 on the "make" command line. So now we could do GCC+bfd, Clang+bfd, and Clang+lld+all-other-LLVM-tools.
from kernelci-core.
Also, probably need to verify that ld.lld
is packaged in the docker images.
from kernelci-core.
Also, the TCWG @ linaro is also testing with Clang+LLD on by default.
from kernelci-core.
Unless upstream arranges for clang builds to use lld by default we should probably keep coverage of builds with GNU LD since that's what people will be building if they just decide to go and build with clang. Testing with lld would definitely be good and I'm all in favour of adding it, I just worry about loosing coverage of the more standard case.
A reference to the discussion with Arnd would be helpful.
from kernelci-core.
A reference to the discussion with Arnd would be helpful.
Video call, unrecorded.
Unless upstream arranges for clang builds to use lld by default we should probably keep coverage of builds with GNU LD since that's what people will be building if they just decide to go and build with clang.
Sure if someone just does make CC=clang
then clang will likely use ld.bfd
(it needs a CMake variable -DCLANG_DEFAULT_LINKER=lld
.
But we'd like to build the kernel with more than just clang; we'd like to use all llvm utilities so we can catch regressions in them.
I agree that make CC=clang LD=ld.lld NM=llvm-nm ...
will get burdensome eventually, and have a few ideas to simplify that in Kbuild.
In the meantime, we'd really like to get testing coverage with lld.
from kernelci-core.
Maybe we could build a handful of defconfigs with an llvm
build environment, as well as the current clang
ones?
I think this could be defined as part of the Docker image used to do the kernel builds (Debian alternatives, or env variables set up before calling make...).
from kernelci-core.
Sounds like something we should be trying with linux-next on staging.
from kernelci-core.
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