Re: [PATCH] perf clang: Fix header include for LLVM >= 14

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Sat, Apr 16, 2022 at 09:45:55AM +0200, Guilherme Amadio escreveu:
> The header TargetRegistry.h has moved in LLVM/clang 14.
> 
> Signed-off-by: Guilherme Amadio <amadio@gentoo.org>

Applied and ammended the commit log message with some extra info
about the problem, this is the end result:

perf clang: Fix header include for LLVM >= 14

The header TargetRegistry.h has moved in LLVM/clang 14.

Committer notes:

The problem as noticed when building in ubuntu:20.04 with this command
line:

  $ make LIBCLANGLLVM=1 -C tools/perf O=/tmp/build/perf

  /usr/bin/ld: /usr/lib/llvm-10/lib/libclangCodeGen.a(BackendUtil.cpp.o): in function `(anonymous namespace)::EmitAssemblyHelper::EmitAssemblyWithNewPassManager(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream> >)':
  (.text._ZN12_GLOBAL__N_118EmitAssemblyHelper30EmitAssemblyWithNewPassManagerEN5clang13BackendActionESt10unique_ptrIN4llvm17raw_pwrite_streamESt14default_deleteIS5_EE+0x1f15): undefined reference to `getPollyPluginInfo()'
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  make[2]: *** [Makefile.perf:677: /tmp/build/perf/perf] Error 1
  make[1]: *** [Makefile.perf:240: sub-make] Error 2
  make: *** [Makefile:70: all] Error 2

Fixed after applying this patch.

Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Guilherme Amadio <amadio@gentoo.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: https://twitter.com/GuilhermeAmadio/status/1514970524232921088
Link: http://lore.kernel.org/lkml/Ylp0M/VYgHOxtcnF@gentoo.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

But then the container build just finished and the problem is still
there :-\

+ make ARCH= CROSS_COMPILE= EXTRA_CFLAGS= LIBCLANGLLVM=1 -C tools/perf O=/tmp/build/perf CC=clang
<SNIP>
  LD      /tmp/build/perf/perf-in.o
  LINK    /tmp/build/perf/perf
/usr/bin/ld: /usr/lib/llvm-10/lib/libclangCodeGen.a(BackendUtil.cpp.o): in function `(anonymous namespace)::EmitAssemblyHelper::EmitAssemblyWithNewPassManager(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream> >)':
(.text._ZN12_GLOBAL__N_118EmitAssemblyHelper30EmitAssemblyWithNewPassManagerEN5clang13BackendActionESt10unique_ptrIN4llvm17raw_pwrite_streamESt14default_deleteIS5_EE+0x1f15): undefined reference to `getPollyPluginInfo()'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [Makefile.perf:677: /tmp/build/perf/perf] Error 1
make[1]: *** [Makefile.perf:240: sub-make] Error 2
make: *** [Makefile:70: all] Error 2
make: Leaving directory '/git/perf-5.18.0-rc2/tools/perf'
+ exit 1
[perfbuilder@five ~]$
[perfbuilder@five ~]$

And that part : /usr/bin/ld: /usr/lib/llvm-10/lib/libclangCodeGen.a
seems to imply its llvm 10 that is installed, lemme check:

[perfbuilder@five ~]$ dsh ubuntu:20.04
$ bash
perfbuilder@7cfe87e48135:/$ dpkg -l | grep llvm
ii  libllvm10:amd64                    1:10.0.0-4ubuntu1                 amd64        Modular compiler and toolchain technologies, runtime library
ii  libllvm12:amd64                    1:12.0.0-3ubuntu1~20.04.5         amd64        Modular compiler and toolchain technologies, runtime library
ii  llvm                               1:10.0-50~exp1                    amd64        Low-Level Virtual Machine (LLVM)
ii  llvm-10                            1:10.0.0-4ubuntu1                 amd64        Modular compiler and toolchain technologies
ii  llvm-10-dev                        1:10.0.0-4ubuntu1                 amd64        Modular compiler and toolchain technologies, libraries and headers
ii  llvm-10-runtime                    1:10.0.0-4ubuntu1                 amd64        Modular compiler and toolchain technologies, IR interpreter
ii  llvm-10-tools                      1:10.0.0-4ubuntu1                 amd64        Modular compiler and toolchain technologies, tools
ii  llvm-dev                           1:10.0-50~exp1                    amd64        Low-Level Virtual Machine (LLVM), libraries and headers
ii  llvm-runtime                       1:10.0-50~exp1                    amd64        Low-Level Virtual Machine (LLVM), bytecode interpreter
perfbuilder@7cfe87e48135:/$ dpkg -l | grep clang
ii  clang                              1:10.0-50~exp1                    amd64        C, C++ and Objective-C compiler (LLVM based)
ii  clang-10                           1:10.0.0-4ubuntu1                 amd64        C, C++ and Objective-C compiler
ii  libclang-10-dev                    1:10.0.0-4ubuntu1                 amd64        Clang library - Development package
ii  libclang-common-10-dev             1:10.0.0-4ubuntu1                 amd64        Clang library - Common development package
ii  libclang-cpp10                     1:10.0.0-4ubuntu1                 amd64        C++ interface to the Clang library
ii  libclang-dev                       1:10.0-50~exp1                    amd64        clang library - Development package
ii  libclang1-10                       1:10.0.0-4ubuntu1                 amd64        C interface to the Clang library
perfbuilder@7cfe87e48135:/$

Yeah, so I'll try making it test >= 10, lets see...

- Arnaldo