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Revert "tools build: Remove leftover libcap tests that prevents fast path feature detection from working"

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Ian pointed out that the libcap feature test is also used by bpftool, so
we can't remove it just because perf stopped using it, revert the
removal of the feature test.

Since both perf and libcap uses the fast path feature detection
(tools/build/feature/test-all.c), probably the best thing is to keep
libcap-devel when building perf even it not being used there.

This reverts commit 47b3b6435e.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2024-08-29 11:46:40 -03:00
parent 47b3b6435e
commit 0fd77ae4a3
2 changed files with 25 additions and 1 deletions
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6
tools/build/feature/Makefile
View File

@ -25,6 +25,7 @@ FILES= \
test-libbfd-liberty-z.bin \
test-cplus-demangle.bin \
test-cxa-demangle.bin \
test-libcap.bin \
test-libelf.bin \
test-libelf-getphdrnum.bin \
test-libelf-gelf_getnote.bin \
@ -111,7 +112,7 @@ all: $(FILES)
__BUILD = $(CC) $(CFLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.c,$(@F)) $(LDFLAGS)
BUILD = $(__BUILD) > $(@:.bin=.make.output) 2>&1
BUILD_BFD = $(BUILD) -DPACKAGE='"perf"' -lbfd -ldl
BUILD_ALL = $(BUILD) -fstack-protector-all -O2 -D_FORTIFY_SOURCE=2 -ldw -lelf -lnuma -lelf -lslang $(FLAGS_PERL_EMBED) $(FLAGS_PYTHON_EMBED) -DPACKAGE='"perf"' -lbfd -ldl -lz -llzma -lzstd
BUILD_ALL = $(BUILD) -fstack-protector-all -O2 -D_FORTIFY_SOURCE=2 -ldw -lelf -lnuma -lelf -lslang $(FLAGS_PERL_EMBED) $(FLAGS_PYTHON_EMBED) -DPACKAGE='"perf"' -lbfd -ldl -lz -llzma -lzstd -lcap
__BUILDXX = $(CXX) $(CXXFLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.cpp,$(@F)) $(LDFLAGS)
BUILDXX = $(__BUILDXX) > $(@:.bin=.make.output) 2>&1
@ -139,6 +140,9 @@ $(OUTPUT)test-fortify-source.bin:
$(OUTPUT)test-bionic.bin:
$(BUILD)
$(OUTPUT)test-libcap.bin:
$(BUILD) -lcap
$(OUTPUT)test-libelf.bin:
$(BUILD) -lelf

20
tools/build/feature/test-libcap.c Normal file
View File

@ -0,0 +1,20 @@
// SPDX-License-Identifier: GPL-2.0
#include <sys/capability.h>
#include <linux/capability.h>
int main(void)
{
cap_flag_value_t val;
cap_t caps = cap_get_proc();
if (!caps)
return 1;
if (cap_get_flag(caps, CAP_SYS_ADMIN, CAP_EFFECTIVE, &val) != 0)
return 1;
if (cap_free(caps) != 0)
return 1;
return 0;
}