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? Thanks, Namhyung > --- > base-commit: a13c140cc289c0b7b3770bce5b3ad42ab35074aa > change-id: 20260511-james-perf-llvm-version-43ab1cb5bc7d > > Best regards, > -- > James Clark <[email protected]> >
