kernel/linux.git/tools/build/feature/test-all.c, branch linux-7.0.y

tools/build: Add a feature test for libopenssl

2025-12-17T13:44:24+00:00

It's used by bpftool and the kernel build. Let's add a feature test so that perf can decide what to do based on the availability. Signed-off-by: Namhyung Kim

tool build: Remove __get_cpuid feature test

2025-11-14T07:03:11+00:00

This feature test is no longer used so remove. The function tested by the feature test is used in: tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c however, the Makefile just assumes the presence of the function and doesn't perform a build feature test for it. Signed-off-by: Ian Rogers Reviewed-by: James Clark Signed-off-by: Namhyung Kim

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: The bfd features are opt-in, stop testing for them by default

2025-06-24T17:27:50+00:00

These are leftovers noticed while updating a build container. We don't need those so that test-all.c can build and thus speed up the feature detection. Test for those features only if the user asks for BUILD_NONDISTRO=1 to build with libbfd. Signed-off-by: Arnaldo Carvalho de Melo Reviewed-by: James Clark Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20250620212435.93846-4-acme@kernel.org Signed-off-by: Namhyung Kim

tools build: Add feature test for libelf with ZSTD

2024-12-18T19:24:32+00:00

The macro ELFCOMPRESS_ZSTD defines the compress algorithm, which was introduced in the commit ("libelf: Document and make ELFCOMPRESS_ZSTD usable with old system elf.h") of the repository elfutils-0.188-67. Therefore, libelf 0.189 and later versions require to link the libzstd library. Add a test for checking if libelf supports ZSTD algorithm. Pass the macro ELFCOMPRESS_ZSTD as an argument to the elf_compress() function. If the build succeeds, it means the feature is supported. Reviewed-by: Quentin Monnet Signed-off-by: Leo Yan Tested-by: Namhyung Kim Tested-by: Quentin Monnet Acked-by: Andrii Nakryiko Acked-by: Jiri Olsa Cc: Adrian Hunter Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Eduard Zingerman Cc: Guilherme Amadio Cc: Hao Luo Cc: Ian Rogers Cc: James Clark Cc: John Fastabend Cc: KP Singh Cc: Kan Liang Cc: Martin KaFai Lau Cc: Nick Terrell Cc: Song Liu Cc: Stanislav Fomichev Cc: Yonghong Song Link: https://lore.kernel.org/r/20241215221223.293205-2-leo.yan@arm.com Signed-off-by: Arnaldo Carvalho de Melo

tools build: Test for presence of libtraceevent and libtracefs in test-all.c

2024-12-18T19:24:28+00:00

Since these are so far considered part of the basic set of libraries to be present when building perf, have then in tools/build/features/test-all.c. They were already in the FEATURE_TESTS_BASIC variable of tools/build/Makefile.feature, meaning if test-all.c builds, those features would be set as present, but then we were calling "again" (well, they were not in test-all.c, so were not really being tested) for it to be detected, fix this all up by not calling feature_check for those features but instead have them in test-all.c to be tested together with the the set of basic expected libraries. Cc: Adrian Hunter Cc: Ian Rogers Cc: James Clark Cc: Jiri Olsa Cc: Kan Liang Cc: Namhyung Kim Link: https://lore.kernel.org/lkml/20241213195052.914914-3-acme@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

tools features: Don't check for libunwind devel files by default

2024-12-09T20:51:53+00:00

Since 13e17c9ff49119aa ("perf build: Make libunwind opt-in rather than opt-out"), so we shouldn't by default be testing for its availability at build time in tools/build/features/test-all.c. That test was designed to test the features we expect to be the most common ones in most builds, so if we test build just that file, then we assume the features there are present and will not test one by one. Removing it from test-all.c gets rid of the first impediment for test-all.c to build successfully: $ cat /tmp/build/perf-tools-next/feature/test-all.make.output In file included from test-all.c:62: test-libunwind.c:2:10: fatal error: libunwind.h: No such file or directory 2 | #include | ^~~~~~~~~~~~~ compilation terminated. $ We then get to: $ cat /tmp/build/perf-tools-next/feature/test-all.make.output /usr/bin/ld: cannot find -lunwind-x86_64: No such file or directory /usr/bin/ld: cannot find -lunwind: No such file or directory collect2: error: ld returned 1 exit status $ So make all the logic related to setting CFLAGS, LDFLAGS, etc for libunwind to be conditional on NO_LIBWUNWIND=1, which is now the default, now we get a faster build: $ cat /tmp/build/perf-tools-next/feature/test-all.make.output $ ldd /tmp/build/perf-tools-next/feature/test-all.bin linux-vdso.so.1 (0x00007fef04cde000) libdw.so.1 => /lib64/libdw.so.1 (0x00007fef04a49000) libpython3.12.so.1.0 => /lib64/libpython3.12.so.1.0 (0x00007fef04478000) libm.so.6 => /lib64/libm.so.6 (0x00007fef04394000) libtraceevent.so.1 => /lib64/libtraceevent.so.1 (0x00007fef0436c000) libtracefs.so.1 => /lib64/libtracefs.so.1 (0x00007fef04345000) libcrypto.so.3 => /lib64/libcrypto.so.3 (0x00007fef03e95000) libz.so.1 => /lib64/libz.so.1 (0x00007fef03e72000) libelf.so.1 => /lib64/libelf.so.1 (0x00007fef03e56000) libnuma.so.1 => /lib64/libnuma.so.1 (0x00007fef03e48000) libslang.so.2 => /lib64/libslang.so.2 (0x00007fef03b65000) libperl.so.5.38 => /lib64/libperl.so.5.38 (0x00007fef037c6000) libc.so.6 => /lib64/libc.so.6 (0x00007fef035d5000) liblzma.so.5 => /lib64/liblzma.so.5 (0x00007fef035a0000) libzstd.so.1 => /lib64/libzstd.so.1 (0x00007fef034e1000) libbz2.so.1 => /lib64/libbz2.so.1 (0x00007fef034cd000) /lib64/ld-linux-x86-64.so.2 (0x00007fef04ce0000) libcrypt.so.2 => /lib64/libcrypt.so.2 (0x00007fef03495000) $ Fixes: 13e17c9ff49119aa ("perf build: Make libunwind opt-in rather than opt-out") Cc: Adrian Hunter Cc: Ian Rogers Cc: James Clark Cc: Jiri Olsa Cc: Kan Liang Cc: Namhyung Kim Link: https://lore.kernel.org/lkml/Z09zTztD8X8qIWCX@x1 Signed-off-by: Arnaldo Carvalho de Melo