On Thu Jul 16, 2026 at 1:46 AM CEST, Namhyung Kim wrote: > Hello BPF folks, > > On Wed, Jul 15, 2026 at 03:53:47PM +0100, James Clark wrote: >> I ran into the build issue mentioned in the first commit, because using >> an option like LLVM=-15 is a documented way to build [1], but only >> some of the LLVM tools defined in tools/ support this. >> >> After fixing that, a lot of other tidyups fell out. I didn't go too far, >> for example some selftests include tools/testing/selftests/lib.mk which >> reimplements some of the LLVM_SUFFIX stuff, but other selftests include >> tools/scripts/Makefile.include and I stopped before touching the former. >> Some other non build scripts hard code toolchains and I didn't touch >> those either, this change is only focused on things that already >> include Makefile.include. >> >> [1]: Documentation/kbuild/llvm.rst >> >> Signed-off-by: James Clark <[email protected]> >> --- >> Changes in v4: >> - Drop "tools/build: selftests: Allow versioning LLVM lld", clang >> already picks the correct sibling lld version. (Sashiko) >> - Link to v3: >> https://lore.kernel.org/r/[email protected] >> >> Changes in v3: >> - Add warning for empty $USE_LD >> - Use $HOSTREADELF in bpf Makefile >> - Rebase on v7.2-rc3 >> - Link to v2: >> https://lore.kernel.org/r/[email protected] >> >> Changes in v2: >> - Fix selftests/bpf build. LLD needs to take the full path to be used >> with -fuse-ld= >> - Link to v1: >> https://lore.kernel.org/r/[email protected] >> >> --- >> James Clark (4): >> tools/build: Allow versioning of all LLVM tools defined in >> Makefile.include >> tools/build: Indent if else blocks >> tools/build: Allow versioning LLVM readelf >> tools/build: selftests: Remove some duplicate toolchain definitions >> >> tools/bpf/resolve_btfids/Makefile | 3 -- >> tools/lib/api/Makefile | 4 -- >> tools/lib/bpf/Makefile | 8 ++-- >> tools/lib/subcmd/Makefile | 4 -- >> tools/lib/symbol/Makefile | 4 -- >> tools/perf/Makefile.perf | 7 ---- >> tools/scripts/Makefile.include | 77 >> ++++++++++++++++++++---------------- >> tools/testing/selftests/bpf/Makefile | 1 - >> 8 files changed, 46 insertions(+), 62 deletions(-) > > Are you ok with this change and going through perf tree? >
Sorry for the delay, yes, feel free to take it through your tree. > Thanks, > Namhyung > >> --- >> base-commit: a13c140cc289c0b7b3770bce5b3ad42ab35074aa >> change-id: 20260511-james-perf-llvm-version-43ab1cb5bc7d >> >> Best regards, >> -- >> James Clark <[email protected]> >>
