linux-kernel - Re: [PATCH 1/1 next] tools build: Remove the libunwind feature tests from the ones detected when test-all.o builds

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Message-ID: <CAP-5=fWqpcwc021enM8uMChSgCRB+UW_6z7+=pdsQG9msLJsbw@mail.gmail.com>
Date: Mon, 17 Mar 2025 09:10:29 -0700
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>, 
	Kan Liang <kan.liang@...ux.intel.com>, 
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/1 next] tools build: Remove the libunwind feature tests
 from the ones detected when test-all.o builds

On Wed, Dec 11, 2024 at 7:45 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> We have a tools/build/feature/test-all.c that has the most common set of
> features that perf uses and are expected to have its development files
> available when building perf.
>
> When we made libwunwind opt-in we forgot to remove them from the list of
> features that are assumed to be available when test-all.c builds, remove
> them.
>
> Before this patch:
>
>   $ rm -rf /tmp/b ; mkdir /tmp/b ; make -C tools/perf O=/tmp/b feature-dump ; grep feature-libunwind-aarch64= /tmp/b/FEATURE-DUMP
>   feature-libunwind-aarch64=1
>   $
>
> Even tho this not being test built and those header files being
> available:
>
>   $ head -5 tools/build/feature/test-libunwind-aarch64.c
>   // SPDX-License-Identifier: GPL-2.0
>   #include <libunwind-aarch64.h>
>   #include <stdlib.h>
>
>   extern int UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,
>   $
>
> After this patch:
>
>   $ grep feature-libunwind- /tmp/b/FEATURE-DUMP
>   $
>
> Now an audit on what is being enabled when test-all.c builds will be
> performed.
>
> Fixes: 176c9d1e6a06f2fa ("tools features: Don't check for libunwind devel files by default")
> 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>

Sorry for the delay on this.

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

Thanks,
Ian

> ---
>  tools/build/Makefile.feature | 7 -------
>  1 file changed, 7 deletions(-)
>
> diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
> index b2884bc23775e986..9cde51104c2d70ec 100644
> --- a/tools/build/Makefile.feature
> +++ b/tools/build/Makefile.feature
> @@ -90,13 +90,6 @@ FEATURE_TESTS_EXTRA :=                  \
>           libbfd-liberty                 \
>           libbfd-liberty-z               \
>           libopencsd                     \
> -         libunwind-x86                  \
> -         libunwind-x86_64               \
> -         libunwind-arm                  \
> -         libunwind-aarch64              \
> -         libunwind-debug-frame          \
> -         libunwind-debug-frame-arm      \
> -         libunwind-debug-frame-aarch64  \
>           cxx                            \
>           llvm                           \
>           clang                          \
> --
> 2.47.0
>