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[PW_SID:1070415] [v1,1/2] perf build: Remove libunwind support #1655

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[PW_SID:1070415] [v1,1/2] perf build: Remove libunwind support #1655

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664ae51
perf build: Remove libunwind support
captain5050 Mar 21, 2026
59493cc
tools build: Remove libunwind feature tests
captain5050 Mar 21, 2026
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31 changes: 0 additions & 31 deletions tools/build/feature/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -36,14 +36,6 @@ FILES= \
test-libtraceevent.bin \
test-libcpupower.bin \
test-libtracefs.bin \
test-libunwind.bin \
test-libunwind-debug-frame.bin \
test-libunwind-x86.bin \
test-libunwind-x86_64.bin \
test-libunwind-arm.bin \
test-libunwind-aarch64.bin \
test-libunwind-debug-frame-arm.bin \
test-libunwind-debug-frame-aarch64.bin \
test-pthread-attr-setaffinity-np.bin \
test-pthread-barrier.bin \
test-stackprotector-all.bin \
Expand Down Expand Up @@ -203,29 +195,6 @@ $(OUTPUT)test-libnuma.bin:
$(OUTPUT)test-numa_num_possible_cpus.bin:
$(BUILD) -lnuma

$(OUTPUT)test-libunwind.bin:
$(BUILD) -lelf -llzma

$(OUTPUT)test-libunwind-debug-frame.bin:
$(BUILD) -lelf -llzma
$(OUTPUT)test-libunwind-x86.bin:
$(BUILD) -lelf -llzma -lunwind-x86

$(OUTPUT)test-libunwind-x86_64.bin:
$(BUILD) -lelf -llzma -lunwind-x86_64

$(OUTPUT)test-libunwind-arm.bin:
$(BUILD) -lelf -llzma -lunwind-arm

$(OUTPUT)test-libunwind-aarch64.bin:
$(BUILD) -lelf -llzma -lunwind-aarch64

$(OUTPUT)test-libunwind-debug-frame-arm.bin:
$(BUILD) -lelf -llzma -lunwind-arm

$(OUTPUT)test-libunwind-debug-frame-aarch64.bin:
$(BUILD) -lelf -llzma -lunwind-aarch64

$(OUTPUT)test-libslang.bin:
$(BUILD) -lslang

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27 changes: 0 additions & 27 deletions tools/build/feature/test-libunwind-aarch64.c
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28 changes: 0 additions & 28 deletions tools/build/feature/test-libunwind-arm.c
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17 changes: 0 additions & 17 deletions tools/build/feature/test-libunwind-debug-frame-aarch64.c
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17 changes: 0 additions & 17 deletions tools/build/feature/test-libunwind-debug-frame-arm.c
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17 changes: 0 additions & 17 deletions tools/build/feature/test-libunwind-debug-frame.c
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28 changes: 0 additions & 28 deletions tools/build/feature/test-libunwind-x86.c
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28 changes: 0 additions & 28 deletions tools/build/feature/test-libunwind-x86_64.c
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28 changes: 0 additions & 28 deletions tools/build/feature/test-libunwind.c
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1 change: 0 additions & 1 deletion tools/perf/Documentation/perf-check.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -63,7 +63,6 @@ feature::
libpython / HAVE_LIBPYTHON_SUPPORT
libslang / HAVE_SLANG_SUPPORT
libtraceevent / HAVE_LIBTRACEEVENT
libunwind / HAVE_LIBUNWIND_SUPPORT
lzma / HAVE_LZMA_SUPPORT
numa_num_possible_cpus / HAVE_LIBNUMA_SUPPORT
zlib / HAVE_ZLIB_SUPPORT
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4 changes: 2 additions & 2 deletions tools/perf/Documentation/perf-config.txt
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Expand Up @@ -446,8 +446,8 @@ call-graph.*::

call-graph.record-mode::
The mode for user space can be 'fp' (frame pointer), 'dwarf'
and 'lbr'. The value 'dwarf' is effective only if libunwind
(or a recent version of libdw) is present on the system;
and 'lbr'. The value 'dwarf' is effective only if a recent
version of libdw is present on the system;
the value 'lbr' only works for certain cpus. The method for
kernel space is controlled not by this option but by the
kernel config (CONFIG_UNWINDER_*).
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2 changes: 1 addition & 1 deletion tools/perf/Documentation/perf-record.txt
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Expand Up @@ -308,7 +308,7 @@ OPTIONS
In some systems, where binaries are build with gcc
--fomit-frame-pointer, using the "fp" method will produce bogus
call graphs, using "dwarf", if available (perf tools linked to
the libunwind or libdw library) should be used instead.
the libdw library) should be used instead.
Using the "lbr" method doesn't require any compiler options. It
will produce call graphs from the hardware LBR registers. The
main limitation is that it is only available on new Intel
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