[PATCH 1/1 perf-tools-next] tools features: Don't check for libunwind devel files by default

From: Arnaldo Carvalho de Melo
Date: Tue Dec 03 2024 - 16:08:38 EST

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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 <libunwind.h>
| ^~~~~~~~~~~~~
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 <adrian.hunter@xxxxxxxxx>
Cc: Ian Rogers <irogers@xxxxxxxxxx>
Cc: James Clark <james.clark@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/build/feature/test-all.c | 5 --
tools/perf/Makefile.config | 83 ++++++++++++++++++++--------------
2 files changed, 49 insertions(+), 39 deletions(-)

diff --git a/tools/build/feature/test-all.c b/tools/build/feature/test-all.c
index 59ef3d7fe6a4e771..80ac297f81967171 100644
--- a/tools/build/feature/test-all.c
+++ b/tools/build/feature/test-all.c
@@ -58,10 +58,6 @@
# include "test-libelf-getshdrstrndx.c"
#undef main

-#define main main_test_libunwind
-# include "test-libunwind.c"
-#undef main
-
#define main main_test_libslang
# include "test-libslang.c"
#undef main
@@ -184,7 +180,6 @@ int main(int argc, char *argv[])
main_test_libelf_getphdrnum();
main_test_libelf_gelf_getnote();
main_test_libelf_getshdrstrndx();
- main_test_libunwind();
main_test_libslang();
main_test_libbfd();
main_test_libbfd_buildid();
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 2916d59c88cd08b2..0e4f6a860ae25339 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -43,7 +43,9 @@ endif
# Additional ARCH settings for ppc
ifeq ($(SRCARCH),powerpc)
CFLAGS += -I$(OUTPUT)arch/powerpc/include/generated
- LIBUNWIND_LIBS := -lunwind -lunwind-ppc64
+ ifndef NO_LIBUNWIND
+ LIBUNWIND_LIBS := -lunwind -lunwind-ppc64
+ endif
endif

# Additional ARCH settings for x86
@@ -53,25 +55,35 @@ ifeq ($(SRCARCH),x86)
ifeq (${IS_64_BIT}, 1)
CFLAGS += -DHAVE_ARCH_X86_64_SUPPORT
ARCH_INCLUDE = ../../arch/x86/lib/memcpy_64.S ../../arch/x86/lib/memset_64.S
- LIBUNWIND_LIBS = -lunwind-x86_64 -lunwind -llzma
+ ifndef NO_LIBUNWIND
+ LIBUNWIND_LIBS = -lunwind-x86_64 -lunwind -llzma
+ endif
$(call detected,CONFIG_X86_64)
else
- LIBUNWIND_LIBS = -lunwind-x86 -llzma -lunwind
+ ifndef NO_LIBUNWIND
+ LIBUNWIND_LIBS = -lunwind-x86 -llzma -lunwind
+ endif
endif
endif

ifeq ($(SRCARCH),arm)
- LIBUNWIND_LIBS = -lunwind -lunwind-arm
+ ifndef NO_LIBUNWIND
+ LIBUNWIND_LIBS = -lunwind -lunwind-arm
+ endif
endif

ifeq ($(SRCARCH),arm64)
CFLAGS += -I$(OUTPUT)arch/arm64/include/generated
- LIBUNWIND_LIBS = -lunwind -lunwind-aarch64
+ ifndef NO_LIBUNWIND
+ LIBUNWIND_LIBS = -lunwind -lunwind-aarch64
+ endif
endif

ifeq ($(SRCARCH),loongarch)
CFLAGS += -I$(OUTPUT)arch/loongarch/include/generated
- LIBUNWIND_LIBS = -lunwind -lunwind-loongarch64
+ ifndef NO_LIBUNWIND
+ LIBUNWIND_LIBS = -lunwind -lunwind-loongarch64
+ endif
endif

ifeq ($(ARCH),s390)
@@ -80,7 +92,9 @@ endif

ifeq ($(ARCH),mips)
CFLAGS += -I$(OUTPUT)arch/mips/include/generated
- LIBUNWIND_LIBS = -lunwind -lunwind-mips
+ ifndef NO_LIBUNWIND
+ LIBUNWIND_LIBS = -lunwind -lunwind-mips
+ endif
endif

ifeq ($(ARCH),riscv)
@@ -121,16 +135,18 @@ ifdef LIBUNWIND_DIR
$(foreach libunwind_arch,$(LIBUNWIND_ARCHS),$(call libunwind_arch_set_flags,$(libunwind_arch)))
endif

-# Set per-feature check compilation flags
-FEATURE_CHECK_CFLAGS-libunwind = $(LIBUNWIND_CFLAGS)
-FEATURE_CHECK_LDFLAGS-libunwind = $(LIBUNWIND_LDFLAGS) $(LIBUNWIND_LIBS)
-FEATURE_CHECK_CFLAGS-libunwind-debug-frame = $(LIBUNWIND_CFLAGS)
-FEATURE_CHECK_LDFLAGS-libunwind-debug-frame = $(LIBUNWIND_LDFLAGS) $(LIBUNWIND_LIBS)
-
-FEATURE_CHECK_LDFLAGS-libunwind-arm += -lunwind -lunwind-arm
-FEATURE_CHECK_LDFLAGS-libunwind-aarch64 += -lunwind -lunwind-aarch64
-FEATURE_CHECK_LDFLAGS-libunwind-x86 += -lunwind -llzma -lunwind-x86
-FEATURE_CHECK_LDFLAGS-libunwind-x86_64 += -lunwind -llzma -lunwind-x86_64
+ifndef NO_LIBUNWIND
+ # Set per-feature check compilation flags
+ FEATURE_CHECK_CFLAGS-libunwind = $(LIBUNWIND_CFLAGS)
+ FEATURE_CHECK_LDFLAGS-libunwind = $(LIBUNWIND_LDFLAGS) $(LIBUNWIND_LIBS)
+ FEATURE_CHECK_CFLAGS-libunwind-debug-frame = $(LIBUNWIND_CFLAGS)
+ FEATURE_CHECK_LDFLAGS-libunwind-debug-frame = $(LIBUNWIND_LDFLAGS) $(LIBUNWIND_LIBS)
+
+ FEATURE_CHECK_LDFLAGS-libunwind-arm += -lunwind -lunwind-arm
+ FEATURE_CHECK_LDFLAGS-libunwind-aarch64 += -lunwind -lunwind-aarch64
+ FEATURE_CHECK_LDFLAGS-libunwind-x86 += -lunwind -llzma -lunwind-x86
+ FEATURE_CHECK_LDFLAGS-libunwind-x86_64 += -lunwind -llzma -lunwind-x86_64
+endif

FEATURE_CHECK_LDFLAGS-libcrypto = -lcrypto

@@ -734,26 +750,25 @@ ifeq ($(dwarf-post-unwind),1)
$(call detected,CONFIG_DWARF_UNWIND)
endif

-ifndef NO_LOCAL_LIBUNWIND
- ifeq ($(SRCARCH),$(filter $(SRCARCH),arm arm64))
- $(call feature_check,libunwind-debug-frame)
- ifneq ($(feature-libunwind-debug-frame), 1)
- $(warning No debug_frame support found in libunwind)
+ifndef NO_LIBUNWIND
+ ifndef NO_LOCAL_LIBUNWIND
+ ifeq ($(SRCARCH),$(filter $(SRCARCH),arm arm64))
+ $(call feature_check,libunwind-debug-frame)
+ ifneq ($(feature-libunwind-debug-frame), 1)
+ $(warning No debug_frame support found in libunwind)
+ CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
+ endif
+ else
+ # non-ARM has no dwarf_find_debug_frame() function:
CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
endif
- else
- # non-ARM has no dwarf_find_debug_frame() function:
- CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
+ EXTLIBS += $(LIBUNWIND_LIBS)
+ LDFLAGS += $(LIBUNWIND_LIBS)
+ endif
+ ifeq ($(findstring -static,${LDFLAGS}),-static)
+ # gcc -static links libgcc_eh which contans piece of libunwind
+ LIBUNWIND_LDFLAGS += -Wl,--allow-multiple-definition
endif
- EXTLIBS += $(LIBUNWIND_LIBS)
- LDFLAGS += $(LIBUNWIND_LIBS)
-endif
-ifeq ($(findstring -static,${LDFLAGS}),-static)
- # gcc -static links libgcc_eh which contans piece of libunwind
- LIBUNWIND_LDFLAGS += -Wl,--allow-multiple-definition
-endif
-
-ifndef NO_LIBUNWIND
CFLAGS += -DHAVE_LIBUNWIND_SUPPORT
CFLAGS += $(LIBUNWIND_CFLAGS)
LDFLAGS += $(LIBUNWIND_LDFLAGS)
--
2.47.0

Next message: Geert Uytterhoeven: "Re: [PATCH v2] tracing: Remove definition of trace_*_rcuidle()"
Previous message: Lothar Rubusch: "[PATCH v3 04/10] iio: accel: adxl345: add function to switch measuring"
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