linux-kernel - Re: [Linux-6.11-rc4] perf BROKEN with LLVM/Clang 19.1.0-rc3

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Message-ID: <CAM9d7cgHCJgJb10zaNt7b1Dy=4raiv+a1C1GwrVptNz5Uh+SNg@mail.gmail.com>
Date: Wed, 21 Aug 2024 13:37:25 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: sedat.dilek@...il.com
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Ian Rogers <irogers@...gle.com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>
Subject: Re: [Linux-6.11-rc4] perf BROKEN with LLVM/Clang 19.1.0-rc3

Hello,

On Wed, Aug 21, 2024 at 12:37 PM Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> As a workaround:
>
> dileks@...za:~/src/linux/git$ git diff
> diff --git a/tools/perf/util/setup.py b/tools/perf/util/setup.py
> index 142e9d447ce7..db45e6fe7a21 100644
> --- a/tools/perf/util/setup.py
> +++ b/tools/perf/util/setup.py
> @@ -63,6 +63,8 @@ cflags = getenv('CFLAGS', '').split()
> cflags += ['-fno-strict-aliasing', '-Wno-write-strings',
> '-Wno-unused-parameter', '-Wno-redundant-decls' ]
> if cc_is_clang:
>     cflags += ["-Wno-unused-command-line-argument" ]
> +    cflags += ["-Wno-cast-function-type-mismatch" ]
> +
> else:
>     cflags += ['-Wno-cast-function-type' ]
>

Thanks for the fix.  I wasn't aware of the issue and the fix
looks good to me.  I'll add it to perf-tools if nobody objects.

Thanks,
Namhyung


> dileks@...za:~/src/linux/git$ ~/bin/perf -vv
> perf version 6.11.0-rc4
>                 dwarf: [ on  ]  # HAVE_DWARF_SUPPORT
>    dwarf_getlocations: [ on  ]  # HAVE_DWARF_GETLOCATIONS_SUPPORT
>         syscall_table: [ on  ]  # HAVE_SYSCALL_TABLE_SUPPORT
>                libbfd: [ OFF ]  # HAVE_LIBBFD_SUPPORT
>            debuginfod: [ on  ]  # HAVE_DEBUGINFOD_SUPPORT
>                libelf: [ on  ]  # HAVE_LIBELF_SUPPORT
>               libnuma: [ on  ]  # HAVE_LIBNUMA_SUPPORT
> numa_num_possible_cpus: [ on  ]  # HAVE_LIBNUMA_SUPPORT
>               libperl: [ on  ]  # HAVE_LIBPERL_SUPPORT
>             libpython: [ on  ]  # HAVE_LIBPYTHON_SUPPORT
>              libslang: [ on  ]  # HAVE_SLANG_SUPPORT
>             libcrypto: [ on  ]  # HAVE_LIBCRYPTO_SUPPORT
>             libunwind: [ on  ]  # HAVE_LIBUNWIND_SUPPORT
>    libdw-dwarf-unwind: [ on  ]  # HAVE_DWARF_SUPPORT
>           libcapstone: [ on  ]  # HAVE_LIBCAPSTONE_SUPPORT
>                  zlib: [ on  ]  # HAVE_ZLIB_SUPPORT
>                  lzma: [ on  ]  # HAVE_LZMA_SUPPORT
>             get_cpuid: [ on  ]  # HAVE_AUXTRACE_SUPPORT
>                   bpf: [ on  ]  # HAVE_LIBBPF_SUPPORT
>                   aio: [ on  ]  # HAVE_AIO_SUPPORT
>                  zstd: [ on  ]  # HAVE_ZSTD_SUPPORT
>               libpfm4: [ on  ]  # HAVE_LIBPFM
>         libtraceevent: [ on  ]  # HAVE_LIBTRACEEVENT
>         bpf_skeletons: [ on  ]  # HAVE_BPF_SKEL
>  dwarf-unwind-support: [ on  ]  # HAVE_DWARF_UNWIND_SUPPORT
>            libopencsd: [ OFF ]  # HAVE_CSTRACE_SUPPORT
>
> -Sedat-