Is LLVM 13 (git) really ready for testing/development? libclc didn't compile

[Jan Vesely]

Not Marek, but hope this answer will help.
libclc uses clang CLC preprocessor on .ll files, llvm/clang-13 started
including clc declarations by default (clang
cf3ef15a6ec5e5b45c6c54e8fbe3769255e815ce),
thus corrupting any .ll assembly files that are used by libclc.
Inclusion of the default declarations can be turned off using a cmdline
switch but that remains to be implemented in the libclc build system.
manually adding '-cl-no-stdinc' should work as a workaround.

Jan


On Thu, Mar 4, 2021 at 10:27 PM Dieter Nützel <Dieter at nuetzel-hh.de> wrote:

> Hello Marek,
>
> can't compile anything, here.
> Poor Intel Nehalem X3470.
>
> Trying LLVM 12-rc2 later.
>
> Greetings,
> Dieter
>
> llvm-project/libclc> cd build && cmake ../
> -- The CXX compiler identification is GNU 10.2.1
> -- Detecting CXX compiler ABI info
> -- Detecting CXX compiler ABI info - done
> -- Check for working CXX compiler: /usr/bin/c++ - skipped
> -- Detecting CXX compile features
> -- Detecting CXX compile features - done
> LLVM version: 13.0.0git
> LLVM system libs:
> LLVM libs: -lLLVM-13git
> LLVM libdir: /usr/local/lib
> LLVM bindir: /usr/local/bin
> LLVM ld flags: -L/usr/local/lib
> LLVM cxx flags:
>
> -I/usr/local/include;-std=c++14;;;-fno-exceptions;-D_GNU_SOURCE;-D__STDC_CONSTANT_MACROS;-D__STDC_FORMAT_MACROS;-D__STDC_LIMIT_MACROS;-fno-rtti;-fno-exceptions
>
> clang: /usr/local/bin/clang
> llvm-as: /usr/local/bin/llvm-as
> llvm-link: /usr/local/bin/llvm-link
> opt: /usr/local/bin/opt
> llvm-spirv: /usr/local/bin/llvm-spirv
>
> -- Check for working CLC compiler: /usr/local/bin/clang
> -- Check for working CLC compiler: /usr/local/bin/clang -- works
> -- Check for working LLAsm compiler: /usr/local/bin/llvm-as
> -- Check for working LLAsm compiler: /usr/local/bin/llvm-as -- broken
> CMake Error at cmake/CMakeTestLLAsmCompiler.cmake:40 (message):
>    The LLAsm compiler "/usr/local/bin/llvm-as" is not able to compile a
> simple
>    test program.
>
>    It fails with the following output:
>
>     Change Dir: /opt/llvm-project/libclc/build/CMakeFiles/CMakeTmp
>
>
>
>    Run Build Command(s):/usr/bin/gmake cmTC_87af9/fast && /usr/bin/gmake
> -f
>    CMakeFiles/cmTC_87af9.dir/build.make CMakeFiles/cmTC_87af9.dir/build
>
>    gmake[1]: Verzeichnis
>    „/opt/llvm-project/libclc/build/CMakeFiles/CMakeTmp“ wird betreten
>
>    Building LLAsm object CMakeFiles/cmTC_87af9.dir/testLLAsmCompiler.bc
>
>    /usr/local/bin/clang -E -P -x cl
>
> /opt/llvm-project/libclc/build/CMakeFiles/CMakeTmp/testLLAsmCompiler.ll
> -o
>    CMakeFiles/cmTC_87af9.dir/testLLAsmCompiler.bc.temp
>
>    /usr/local/bin/llvm-as -o
> CMakeFiles/cmTC_87af9.dir/testLLAsmCompiler.bc
>    CMakeFiles/cmTC_87af9.dir/testLLAsmCompiler.bc.temp
>
>    /usr/local/bin/llvm-as:
>    CMakeFiles/cmTC_87af9.dir/testLLAsmCompiler.bc.temp:1:1: error:
> expected
>    top-level entity
>
>    typedef unsigned char uchar;
>
>    ^
>
>    gmake[1]: *** [CMakeFiles/cmTC_87af9.dir/build.make:86:
>    CMakeFiles/cmTC_87af9.dir/testLLAsmCompiler.bc] Fehler 1
>
>    gmake[1]: Verzeichnis
>    „/opt/llvm-project/libclc/build/CMakeFiles/CMakeTmp“ wird verlassen
>
>    gmake: *** [Makefile:140: cmTC_87af9/fast] Fehler 2
>
>
>
>
>
>
>
>    CMake will not be able to correctly generate this project.
> Call Stack (most recent call first):
>    CMakeLists.txt:127 (enable_language)
>
>
> -- Configuring incomplete, errors occurred!
> See also "/opt/llvm-project/libclc/build/CMakeFiles/CMakeOutput.log".
> See also "/opt/llvm-project/libclc/build/CMakeFiles/CMakeError.log".
>
>
> CMakeError.log
> Determining if the LLAsm compiler works failed with the following
> output:
> Change Dir: /opt/llvm-project/libclc/build/CMakeFiles/CMakeTmp
>
> Run Build Command(s):/usr/bin/gmake cmTC_87af9/fast && /usr/bin/gmake
> -f CMakeFiles/cmTC_87af9.dir/build.make CMakeFiles/cmTC_87af9.dir/build
> gmake[1]: Verzeichnis
> „/opt/llvm-project/libclc/build/CMakeFiles/CMakeTmp“ wird betreten
> Building LLAsm object CMakeFiles/cmTC_87af9.dir/testLLAsmCompiler.bc
> /usr/local/bin/clang -E -P     -x cl
> /opt/llvm-project/libclc/build/CMakeFiles/CMakeTmp/testLLAsmCompiler.ll
> -o CMakeFiles/cmTC_87af9.dir/testLLAsmCompiler.bc.temp
> /usr/local/bin/llvm-as -o CMakeFiles/cmTC_87af9.dir/testLLAsmCompiler.bc
> CMakeFiles/cmTC_87af9.dir/testLLAsmCompiler.bc.temp
> /usr/local/bin/llvm-as:
> CMakeFiles/cmTC_87af9.dir/testLLAsmCompiler.bc.temp:1:1: error: expected
> top-level entity
> typedef unsigned char uchar;
> ^
> gmake[1]: *** [CMakeFiles/cmTC_87af9.dir/build.make:86:
> CMakeFiles/cmTC_87af9.dir/testLLAsmCompiler.bc] Fehler 1
> gmake[1]: Verzeichnis
> „/opt/llvm-project/libclc/build/CMakeFiles/CMakeTmp“ wird verlassen
> gmake: *** [Makefile:140: cmTC_87af9/fast] Fehler 2
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