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Message-ID: <CAP-5=fWqA+Wjr5eb3Mi0MO8KZ01fey6J2d72jJouN+_r_8vbdA@mail.gmail.com>
Date: Mon, 17 Mar 2025 09:09:20 -0700
From: Ian Rogers <irogers@...gle.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Adrian Hunter <adrian.hunter@...el.com>,
James Clark <james.clark@...aro.org>, Jiri Olsa <jolsa@...nel.org>,
Kan Liang <kan.liang@...ux.intel.com>, Namhyung Kim <namhyung@...nel.org>,
linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/1 perf-tools-next] tools features: Don't check for
libunwind devel files by default
On Tue, Dec 3, 2024 at 1:08 PM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> 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@...el.com>
> Cc: Ian Rogers <irogers@...gle.com>
> Cc: James Clark <james.clark@...aro.org>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Kan Liang <kan.liang@...ux.intel.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
> 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
Sorry for missing this patch. Given this, and below, are just
declaring a variable making it NO_LIBUNWIND conditional feels like
clutter. I'd suggest just keeping the variable unconditionally and
making the uses conditional (which of course the patch does).
Other than this:
Reviewed-by: Ian Rogers <irogers@...gle.com>
Thanks,
Ian
> 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
>
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