kernel/linux.git/tools/build/Makefile.feature, branch v6.18.21

tools build: Remove libbpf-strings feature test

2025-10-03T19:49:51+00:00

The feature test is unnecessary as the LIBBPF_CURRENT_VERSION_GEQ(1,7) macro can be used instead. The only use was in perf and this is now removed. Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Blake Jones Cc: Ingo Molnar Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Signed-off-by: Arnaldo Carvalho de Melo

tools build: Remove get_current_dir_name feature check

2025-10-03T19:49:11+00:00

As perf no longer tests for this feature, and it was the only user, remove the feature test. Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra [ Remove the call to main_test_get_current_dir_name() from main() in test-all.c, otherwise it will always fail ] Signed-off-by: Arnaldo Carvalho de Melo

tools build: Don't assume libtracefs-devel is always available

2025-10-02T16:11:27+00:00

perf doesn't use libtracefs and so it doesn't make sense to assume it is always available when building test-all.bin, defeating the feature check speedup it provides. The other tools/build/ users such as rtla, rv, etc call $(feature_check libtracefs) to check its availability instead of using the test-all.bin mechanism, stopping the build and asking for libtracefs-devel to be installed. Remove it from FEATURE_TESTS_BASIC to not have it as available, as noted by Ian Rogers during review. Reviewed-by: Ian Rogers Acked-by: Tomas Glozar Cc: Adrian Hunter Cc: Gabriele Monaco Cc: James Clark Cc: Jiri Olsa Cc: Kan Liang Cc: Namhyung Kim Cc: Steven Rostedt Signed-off-by: Arnaldo Carvalho de Melo

tools build: Make libperl opt-in rather than opt-out, deprecate

2025-09-19T19:07:21+00:00

If libperl is installed then the perf tool build will build against it. There appears to be limited interest in the scripting support for perl so let's make it opt-in and deprecate it. With this patch applied you need to add LIBPERL=1 to get libperl support in perf - there is no warning if libperl is missing, but building will fail if libperl is missing and the build has LIBPERL=1. The perf version output is changed to: ``` $ perf version --build-options perf version 6.17.rc3.g8eca69269947 aio: [ on ] # HAVE_AIO_SUPPORT bpf: [ on ] # HAVE_LIBBPF_SUPPORT bpf_skeletons: [ on ] # HAVE_BPF_SKEL debuginfod: [ on ] # HAVE_DEBUGINFOD_SUPPORT dwarf: [ on ] # HAVE_LIBDW_SUPPORT dwarf_getlocations: [ on ] # HAVE_LIBDW_SUPPORT dwarf-unwind: [ on ] # HAVE_DWARF_UNWIND_SUPPORT auxtrace: [ on ] # HAVE_AUXTRACE_SUPPORT libbfd: [ OFF ] # HAVE_LIBBFD_SUPPORT ( tip: Deprecated, license incompatibility, use BUILD_NONDISTRO=1 and install binutils-dev[el] ) libbpf-strings: [ on ] # HAVE_LIBBPF_STRINGS_SUPPORT libcapstone: [ on ] # HAVE_LIBCAPSTONE_SUPPORT libdw-dwarf-unwind: [ on ] # HAVE_LIBDW_SUPPORT libelf: [ on ] # HAVE_LIBELF_SUPPORT libnuma: [ on ] # HAVE_LIBNUMA_SUPPORT libopencsd: [ OFF ] # HAVE_CSTRACE_SUPPORT libperl: [ OFF ] # HAVE_LIBPERL_SUPPORT ( tip: Deprecated, use LIBPERL=1 and install libperl-dev to build with it ) libpfm4: [ on ] # HAVE_LIBPFM libpython: [ on ] # HAVE_LIBPYTHON_SUPPORT libslang: [ on ] # HAVE_SLANG_SUPPORT libtraceevent: [ on ] # HAVE_LIBTRACEEVENT libunwind: [ OFF ] # HAVE_LIBUNWIND_SUPPORT ( tip: Deprecated, use LIBUNWIND=1 and install libunwind-dev[el] to build with it ) lzma: [ on ] # HAVE_LZMA_SUPPORT numa_num_possible_cpus: [ on ] # HAVE_LIBNUMA_SUPPORT zlib: [ on ] # HAVE_ZLIB_SUPPORT zstd: [ on ] # HAVE_ZSTD_SUPPORT ``` i.e. there is a tip saying about deprecation and how to get support back. Signed-off-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Charlie Jenkins Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Kan Liang Cc: Leo Yan Cc: Mark Rutland Cc: Michael Petlan Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Quentin Monnet Cc: Steven Rostedt (VMware) Cc: Tomas Glozar Cc: Yuzhuo Jing Link: https://lore.kernel.org/lkml/aMrk03gigBlGcYLK@x1/ Link: https://lore.kernel.org/lkml/CAP-5=fVX+bLBRJCiziDi_hBySgv2NFtDoghtpheSSxVAvvETGw@mail.gmail.com [ Keep the pre-existing perl-ExtUtils-Embed hint for Fedora/RHEL systems ] Signed-off-by: Arnaldo Carvalho de Melo

tools: Remove libcrypto dependency

2025-06-26T17:51:41+00:00

Remove all occurrence of libcrypto in the build system. Signed-off-by: Yuzhuo Jing Signed-off-by: Eric Biggers Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20250625202311.23244-5-ebiggers@kernel.org Signed-off-by: Namhyung Kim

perf build: detect support for libbpf's emit_strings option

2025-06-20T21:48:14+00:00

This creates a config option that detects libbpf's ability to display character arrays as strings, which was just added to the BPF tree (https://git.kernel.org/bpf/bpf-next/c/87c9c79a02b4). To test this change, I built perf (from later in this patch set) with: - static libbpf (default, using source from kernel tree) - dynamic libbpf (LIBBPF_DYNAMIC=1 LIBBPF_INCLUDE=/usr/local/include) For both the static and dynamic versions, I used headers with and without the ".emit_strings" option. I verified that of the four resulting binaries, the two with ".emit_strings" would successfully record BPF_METADATA events, and the two without wouldn't. All four binaries would successfully display BPF_METADATA events, because the relevant bit of libbpf code is only used during "perf record". Signed-off-by: Blake Jones Link: https://lore.kernel.org/r/20250612194939.162730-2-blakejones@google.com Signed-off-by: Namhyung Kim

tools/build: Remove some unused libbpf pre-1.0 feature test logic

2025-06-09T18:18:19+00:00

Commit 76a97cf2e169 ("perf build: Remove libbpf pre-1.0 feature tests") removed the libbpf feature test logic used by perf in favor of using LIBBPF_MAJOR_VERSION. Remove some build targets that should have been removed as part of that clean up. Fixes: 76a97cf2e169 ("perf build: Remove libbpf pre-1.0 feature tests") Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20250603221358.2562167-1-irogers@google.com Signed-off-by: Namhyung Kim

tools build: Don't show libbfd build status as it is opt-in

2025-04-10T13:45:30+00:00

Since dd317df072071903 ("perf build: Make binutil libraries opt in") doesn't try to build with binutils libraries, so showing that it is OFF when building causes just distraction, remove it from FEATURES_DISPLAY. For people that for some reason notice that there is always 'perf -vv', a short hand for 'perf version --build-options' and 'perf check feature libbfd' that now explains why it is not built: $ perf check feature libbfd libbfd: [ OFF ] # HAVE_LIBBFD_SUPPORT ( tip: Deprecated, license incompatibility, use BUILD_NONDISTRO=1 and install binutils-dev[el] ) $ Fixes: dd317df072071903 ("perf build: Make binutil libraries opt in") Tested-by: Ingo Molnar Cc: Adrian Hunter Cc: Dmitriy Vyukov Cc: Howard Chu Cc: Ian Rogers Cc: Jiri Olsa Cc: Kan Liang Cc: Namhyung Kim Cc: Peter Zijlstra Link: https://lore.kernel.org/r/Z--pWmTHGb62_83e@gmail.com Signed-off-by: Arnaldo Carvalho de Melo

tools build: Don't show libunwind build status as it is opt-in

2025-04-10T13:44:55+00:00

Since 13e17c9ff49119aa ("perf build: Make libunwind opt-in rather than opt-out") doesn't try to build with libunwind, so showing that it is OFF when building causes just distraction, remove it from FEATURES_DISPLAY. For people that for some reason notice that there is always 'perf -vv', a short hand for 'perf version --build-options' and 'perf check feature libunwind' that now explains why it is not built: $ perf check feature libunwind libunwind: [ OFF ] # HAVE_LIBUNWIND_SUPPORT ( tip: Deprecated, use LIBUNWIND=1 and install libunwind-dev[el] to build with it ) $ Fixes: 13e17c9ff49119aa ("perf build: Make libunwind opt-in rather than opt-out") Reported-by: Ingo Molnar Tested-by: Ingo Molnar Cc: Adrian Hunter Cc: Dmitriy Vyukov Cc: Howard Chu Cc: Ian Rogers Cc: Jiri Olsa Cc: Kan Liang Cc: Namhyung Kim Cc: Peter Zijlstra Link: https://lore.kernel.org/r/Z--pWmTHGb62_83e@gmail.com Signed-off-by: Arnaldo Carvalho de Melo

tools build: Don't set libunwind as available if test-all.c build succeeds

2025-04-10T13:43:43+00:00

The tools/build/feature/test-all.c file tries to detect the expected, most common set of libraries/features we expect to have available to build perf with. At some point libunwind was deemed not to be part of that set of libries, but the patches making it to be opt-in ended up forgetting some details, fix one more. Testing it: $ rm -rf /tmp/build/$(basename $PWD)/ ; mkdir -p /tmp/build/$(basename $PWD)/ $ rpm -q libunwind-devel libunwind-devel-1.8.0-3.fc40.x86_64 $ make -k LIBUNWIND=1 CORESIGHT=1 O=/tmp/build/$(basename $PWD)/ -C tools/perf install-bin |& grep unwind && ldd ~/bin/perf | grep unwind ... libunwind: [ on ] CC /tmp/build/perf-tools-next/arch/x86/tests/dwarf-unwind.o CC /tmp/build/perf-tools-next/arch/x86/util/unwind-libunwind.o CC /tmp/build/perf-tools-next/util/arm64-frame-pointer-unwind-support.o CC /tmp/build/perf-tools-next/tests/dwarf-unwind.o CC /tmp/build/perf-tools-next/util/unwind-libunwind-local.o CC /tmp/build/perf-tools-next/util/unwind-libunwind.o libunwind-x86_64.so.8 => /lib64/libunwind-x86_64.so.8 (0x00007f615a549000) libunwind.so.8 => /lib64/libunwind.so.8 (0x00007f615a52f000) $ sudo rpm -e libunwind-devel $ rm -rf /tmp/build/$(basename $PWD)/ ; mkdir -p /tmp/build/$(basename $PWD)/ $ make -k LIBUNWIND=1 CORESIGHT=1 O=/tmp/build/$(basename $PWD)/ -C tools/perf install-bin |& grep unwind && ldd ~/bin/perf | grep unwind Makefile.config:653: No libunwind found. Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR ... libunwind: [ OFF ] CC /tmp/build/perf-tools-next/arch/x86/tests/dwarf-unwind.o CC /tmp/build/perf-tools-next/arch/x86/util/unwind-libdw.o CC /tmp/build/perf-tools-next/util/arm64-frame-pointer-unwind-support.o CC /tmp/build/perf-tools-next/tests/dwarf-unwind.o CC /tmp/build/perf-tools-next/util/unwind-libdw.o $ Should be in a separate patch, but tired now, so also adding a message about the need to use LIBUNWIND=1 in the output when its not available, so done here as well. So, now when the devel files are not available we get: $ make -k LIBUNWIND=1 CORESIGHT=1 O=/tmp/build/$(basename $PWD)/ -C tools/perf install-bin |& grep unwind && ldd ~/bin/perf | grep unwind Makefile.config:653: No libunwind found. Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR and set LIBUNWIND=1 in the make command line as it is opt-in now ... libunwind: [ OFF ] $ Fixes: 13e17c9ff49119aa ("perf build: Make libunwind opt-in rather than opt-out") Reported-by: Ingo Molnar Tested-by: Ingo Molnar Cc: Adrian Hunter Cc: Dmitriy Vyukov Cc: Ian Rogers Cc: James Clark Cc: Jiri Olsa Cc: Kan Liang Cc: Namhyung Kim Cc: Peter Zijlstra Link: https://lore.kernel.org/r/Z_AnsW9oJzFbhIFC@x1 Signed-off-by: Arnaldo Carvalho de Melo