linux-kernel - Re: [PATCH 1/1] perf build: Don't fail fast path feature detection when binutils-devel is not available

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Message-ID: <CAP-5=fUtdjaGHCQBNGuVfq7AYMsk67m1zhtrAwsbcwPSvDEr3Q@mail.gmail.com>
Date: Wed, 12 Nov 2025 19:24:16 -0800
From: Ian Rogers <irogers@...gle.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
	James Clark <james.clark@...aro.org>, Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/1] perf build: Don't fail fast path feature detection
 when binutils-devel is not available

On Wed, Nov 12, 2025 at 4:57 PM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> tldr; Just FYI, I'm carrying this on the perf tools tree.
>
> This is one more remnant of the BUILD_NONDISTRO series to make building
> with binutils-devel opt-in due to license incompatibility.
>
> In this case just the references at link time were still in place, which
> make building the test-all.bin file fail, which wasn't detected before
> probably because the last test was done with binutils-devel available,
> doh.
>
> Now:
>
>   $ rpm -q binutils-devel
>   package binutils-devel is not installed
>   $ file /tmp/build/perf-tools/feature/test-all.bin
>   /tmp/build/perf-tools/feature/test-all.bin: ELF 64-bit LSB executable, x86-64, version 1 (SYSV),
>   dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2,
>   BuildID[sha1]=4b5388a346b51f1b993f0b0dbd49f4570769b03c, for GNU/Linux 3.2.0, not stripped
>   $
>
> Fixes: 970ae86307718c34 ("perf build: The bfd features are opt-in, stop testing for them by default")
> Cc: Ian Rogers <irogers@...gle.com>
> Cc: James Clark <james.clark@...aro.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

Lgtm.

Reviewed-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  tools/build/feature/Makefile | 4 ++--
>  tools/perf/Makefile.config   | 5 ++---
>  2 files changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
> index 49b0add392b1c11a..95646290cb89cda3 100644
> --- a/tools/build/feature/Makefile
> +++ b/tools/build/feature/Makefile
> @@ -107,7 +107,7 @@ 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) -ldl -lz -llzma -lzstd
>
>  __BUILDXX = $(CXX) $(CXXFLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.cpp,$(@F)) $(LDFLAGS)
>    BUILDXX = $(__BUILDXX) > $(@:.bin=.make.output) 2>&1
> @@ -115,7 +115,7 @@ __BUILDXX = $(CXX) $(CXXFLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.cpp,$(
>  ###############################
>
>  $(OUTPUT)test-all.bin:
> -       $(BUILD_ALL) || $(BUILD_ALL) -lopcodes -liberty
> +       $(BUILD_ALL)
>
>  $(OUTPUT)test-hello.bin:
>         $(BUILD)
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index 5700516aa84aec2c..2dd5f5a60568d002 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -354,9 +354,6 @@ FEATURE_CHECK_LDFLAGS-libpython := $(PYTHON_EMBED_LDOPTS)
>
>  FEATURE_CHECK_LDFLAGS-libaio = -lrt
>
> -FEATURE_CHECK_LDFLAGS-disassembler-four-args = -lbfd -lopcodes -ldl
> -FEATURE_CHECK_LDFLAGS-disassembler-init-styled = -lbfd -lopcodes -ldl
> -
>  CORE_CFLAGS += -fno-omit-frame-pointer
>  CORE_CFLAGS += -Wall
>  CORE_CFLAGS += -Wextra
> @@ -930,6 +927,8 @@ ifdef BUILD_NONDISTRO
>
>    ifeq ($(feature-libbfd), 1)
>      EXTLIBS += -lbfd -lopcodes
> +    FEATURE_CHECK_LDFLAGS-disassembler-four-args = -lbfd -lopcodes -ldl
> +    FEATURE_CHECK_LDFLAGS-disassembler-init-styled = -lbfd -lopcodes -ldl
>    else
>      # we are on a system that requires -liberty and (maybe) -lz
>      # to link against -lbfd; test each case individually here
> --
> 2.51.1
>