linux-kernel - Re: [PATCH 1/1] perf python: Cope with declarations after statements found in Python.h

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Message-ID: <CAP-5=fW_3vu-XBe2OC07rkwcvQVKEeiLncVRO1CxGEBNa0tvGQ@mail.gmail.com>
Date:   Wed, 2 Aug 2023 10:30:30 -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>,
        Jiri Olsa <jolsa@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] perf python: Cope with declarations after statements
 found in Python.h

On Wed, Aug 2, 2023 at 6:38 AM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> With -Werror the build was failing on fedora rawhide:
>
>   [perfbuilder@...fe44d67ed perf-6.5.0-rc2]$ gcc -v
>   Using built-in specs.
>   COLLECT_GCC=gcc
>   COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/13/lto-wrapper
>   OFFLOAD_TARGET_NAMES=nvptx-none
>   OFFLOAD_TARGET_DEFAULT=1
>   Target: x86_64-redhat-linux
>   Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,m2,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --enable-libstdcxx-backtrace --with-libstdcxx-zoneinfo=/usr/share/zoneinfo --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-13.2.1-20230728/obj-x86_64-redhat-linux/isl-install --enable-offload-targets=nvptx-none --without-cuda-driver --enable-offload-defaulted --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux --with-build-config=bootstrap-lto --enable-link-serialization=1
>   Thread model: posix
>   Supported LTO compression algorithms: zlib zstd
>   gcc version 13.2.1 20230728 (Red Hat 13.2.1-1) (GCC)
>   [perfbuilder@...fe44d67ed perf-6.5.0-rc2]$
>
>   In file included from /usr/include/python3.12/Python.h:44,
>                    from /git/perf-6.5.0-rc2/tools/perf/util/python.c:2:
>   /usr/include/python3.12/object.h: In function ‘Py_SIZE’:
>   /usr/include/python3.12/object.h:217:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
>     217 |     PyVarObject *var_ob = _PyVarObject_CAST(ob);
>         |     ^~~~~~~~~~~
>     LD      /tmp/build/perf/arch/perf-in.o
>   In file included from /usr/include/python3.12/Python.h:53:
>   /usr/include/python3.12/cpython/longintrepr.h: In function ‘_PyLong_CompactValue’:
>   /usr/include/python3.12/cpython/longintrepr.h:121:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
>     121 |     Py_ssize_t sign = 1 - (op->long_value.lv_tag & _PyLong_SIGN_MASK);
>         |     ^~~~~~~~~~
>
> So add -Wno-declaration-after-statement to the python binding CFLAGS.
>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Ian Rogers <irogers@...gle.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Link: https://lore.kernel.org/lkml/
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

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

Thanks,
Ian

> ---
>  tools/perf/util/setup.py | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/tools/perf/util/setup.py b/tools/perf/util/setup.py
> index 869738fc06c38a4b..79d5e2955f85d8f6 100644
> --- a/tools/perf/util/setup.py
> +++ b/tools/perf/util/setup.py
> @@ -66,6 +66,9 @@ if cc_is_clang:
>  else:
>      cflags += ['-Wno-cast-function-type' ]
>
> +# The python headers have mixed code with declarations (decls after asserts, for instance)
> +cflags += [ "-Wno-declaration-after-statement" ]
> +
>  src_perf  = getenv('srctree') + '/tools/perf'
>  build_lib = getenv('PYTHON_EXTBUILD_LIB')
>  build_tmp = getenv('PYTHON_EXTBUILD_TMP')
> --
> 2.37.1
>