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Fletcher, John P via llvm-dev

2017-Aug-19 16:00 UTC

[llvm-dev] Which is the best compiler to build LLVM 5.0.0 rc2?

Recently I have been building LLVM and Clang from the distribution using gcc
4.9.2.  With the new 5.0.0 rc2 that is giving warning messages during the
compilation.  I have been trying out some other compilers.

gcc 5.2 with -std=c++11   This works, although there are still some warnings.

gcc 6.4 and gcc 7.1  fail with errors such as this in building libcxxabi as
follows:

Command: /opt/cmake/bin/cmake -G "Unix Makefiles"
-DCMAKE_INSTALL_PREFIX=/home/fletcher/LLVM/llvm-5.0.rc2/local_71
-DCMAKE_C_COMPILER=/opt/gcc-7.1/bin/gcc CMAKE_CXX_COMPILER=/opt/gcc-7.1/bin/g++
-DCMAKE_BUILD_TYPE=Release -DLLVM_BUILD_LLVM_DYLIB=ON
-DLLVM_TARGETS_TO_BUILD="host" -DCMAKE_CXX_FLAGS="-std=c++11
-I/opt/gcc-7.1/include/c++/7.1.0" -DCMAKE_EXE_LINKER_FLAGS="-Xlinker
-R/opt/gcc-7.1/lib64 -L/opt/gcc-7.1/lib64" ../llvm

First Error:

Building CXX object
projects/libcxxabi/src/CMakeFiles/cxxabi_objects.dir/cxa_aux_runtime.cpp.o
In file included from
/home/fletcher/LLVM/llvm-5.0.rc2/llvm/projects/libcxx/include/stdlib.h:94:0,
                 from
/home/fletcher/LLVM/llvm-5.0.rc2/llvm/projects/libcxx/include/cstdlib:86,
                 from
/home/fletcher/LLVM/llvm-5.0.rc2/llvm/projects/libcxx/include/exception:82,
                 from
/home/fletcher/LLVM/llvm-5.0.rc2/llvm/projects/libcxx/include/new:89,
                 from
/home/fletcher/LLVM/llvm-5.0.rc2/llvm/projects/libcxxabi/src/cxa_aux_runtime.cpp:14:
/opt/gcc-7.1/include/c++/7.1.0/stdlib.h:38:12: error:  std::abort  has not been
declared
 using std::abort;

clang 4.0.0 fails with a different problem with libcxxabi -

Command:

/opt/cmake/bin/cmake -G "Unix Makefiles"
-DCMAKE_INSTALL_PREFIX=/home/fletcher/LLVM/llvm-5.0.rc2/local_40
-DCMAKE_C_COMPILER=/home/fletcher/LLVM/llvm-4.0.distrib/local/bin/clang
CMAKE_CXX_COMPILER=/home/fletcher/LLVM/llvm-4.0.distrib/local/bin/clang++
-DCMAKE_BUILD_TYPE=Release -DLLVM_BUILD_LLVM_DYLIB=ON
-DLLVM_TARGETS_TO_BUILD="host"
-DCMAKE_CXX_FLAGS="-I/home/fletcher/LLVM/llvm-4.0.distrib/local/include/c++/v1
-stdlib=libc++" -DCMAKE_EXE_LINKER_FLAGS="-Xlinker
-R/home/fletcher/LLVM/llvm-4.0.distrib/local/lib
-L/home/fletcher/LLVM/llvm-4.0.distrib/local/lib -lc++abi -lclangBasic
-lLLVMSupport -lpthread -ldl " ../llvm

Error:

Building CXX object
projects/libcxxabi/src/CMakeFiles/cxxabi_objects.dir/cxa_aux_runtime.cpp.o
In file included from
/home/fletcher/LLVM/llvm-5.0.rc2/llvm/projects/libcxxabi/src/cxa_aux_runtime.cpp:13:
/home/fletcher/LLVM/llvm-5.0.rc2/llvm/projects/libcxxabi/include/cxxabi.h:42:26:
error: unknown type name
      'size_t'

It seems to me that there are some configuration problems here in getting the
correct header arrangement.

The rest of the build works, and looking around clang is recommended for
building libcxxabi.

Is this a known problem?

Thanks

John Fletcher


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don hinton via llvm-dev

2017-Aug-19 18:32 UTC

head link

[llvm-dev] [cfe-dev] Which is the best compiler to build LLVM 5.0.0 rc2?

Why are you passing this?

  -DCMAKE_CXX_FLAGS="-std=c++11 -I/opt/gcc-7.1/include/c++/7.1.0"

CMakeLists.txt should take care of setting -std=c++11, and by passing
-I/opt/gcc-7.1/include/c++/7.1.0, are you short circuiting the compiler's
own include paths?




On Sat, Aug 19, 2017 at 9:00 AM, Fletcher, John P via cfe-dev <
cfe-dev at lists.llvm.org> wrote:
> Recently I have been building LLVM and Clang from the distribution using
> gcc 4.9.2.  With the new 5.0.0 rc2 that is giving warning messages during
> the compilation.  I have been trying out some other compilers.
>
> gcc 5.2 with -std=c++11   This works, although there are still some
> warnings.
>
> gcc 6.4 and gcc 7.1  fail with errors such as this in building libcxxabi
> as follows:
>
> Command: /opt/cmake/bin/cmake -G "Unix Makefiles"
> -DCMAKE_INSTALL_PREFIX=/home/fletcher/LLVM/llvm-5.0.rc2/local_71
> -DCMAKE_C_COMPILER=/opt/gcc-7.1/bin/gcc
CMAKE_CXX_COMPILER=/opt/gcc-7.1/bin/g++
> -DCMAKE_BUILD_TYPE=Release -DLLVM_BUILD_LLVM_DYLIB=ON
> -DLLVM_TARGETS_TO_BUILD="host" -DCMAKE_CXX_FLAGS="-std=c++11
> -I/opt/gcc-7.1/include/c++/7.1.0"
-DCMAKE_EXE_LINKER_FLAGS="-Xlinker
> -R/opt/gcc-7.1/lib64 -L/opt/gcc-7.1/lib64" ../llvm
>
> First Error:
>
> Building CXX object projects/libcxxabi/src/CMakeFiles/cxxabi_objects.dir/
> cxa_aux_runtime.cpp.o
>
> In file included from /home/fletcher/LLVM/llvm-5.0.
> rc2/llvm/projects/libcxx/include/stdlib.h:94:0,
>                  from /home/fletcher/LLVM/llvm-5.0.
> rc2/llvm/projects/libcxx/include/cstdlib:86,
>                  from /home/fletcher/LLVM/llvm-5.0.
> rc2/llvm/projects/libcxx/include/exception:82,
>                  from /home/fletcher/LLVM/llvm-5.0.
> rc2/llvm/projects/libcxx/include/new:89,
>                  from /home/fletcher/LLVM/llvm-5.0.
> rc2/llvm/projects/libcxxabi/src/cxa_aux_runtime.cpp:14:
> /opt/gcc-7.1/include/c++/7.1.0/stdlib.h:38:12: error:  std::abort  has
> not been declared
>  using std::abort;
>
> clang 4.0.0 fails with a different problem with libcxxabi -
>
> Command:
>
> /opt/cmake/bin/cmake -G "Unix Makefiles"
-DCMAKE_INSTALL_PREFIX=/home/
> fletcher/LLVM/llvm-5.0.rc2/local_40 -DCMAKE_C_COMPILER=/home/
> fletcher/LLVM/llvm-4.0.distrib/local/bin/clang CMAKE_CXX_COMPILER=/home/
> fletcher/LLVM/llvm-4.0.distrib/local/bin/clang++
> -DCMAKE_BUILD_TYPE=Release -DLLVM_BUILD_LLVM_DYLIB=ON
> -DLLVM_TARGETS_TO_BUILD="host" -DCMAKE_CXX_FLAGS="-I/home/
> fletcher/LLVM/llvm-4.0.distrib/local/include/c++/v1 -stdlib=libc++"
> -DCMAKE_EXE_LINKER_FLAGS="-Xlinker
-R/home/fletcher/LLVM/llvm-4.0.distrib/local/lib
> -L/home/fletcher/LLVM/llvm-4.0.distrib/local/lib -lc++abi -lclangBasic
> -lLLVMSupport -lpthread -ldl " ../llvm
>
> Error:
>
> Building CXX object projects/libcxxabi/src/CMakeFiles/cxxabi_objects.dir/
> cxa_aux_runtime.cpp.o
> In file included from /home/fletcher/LLVM/llvm-5.0.
> rc2/llvm/projects/libcxxabi/src/cxa_aux_runtime.cpp:13:
>
/home/fletcher/LLVM/llvm-5.0.rc2/llvm/projects/libcxxabi/include/cxxabi.h:42:26:
> error: unknown type name
>       'size_t'
>
> It seems to me that there are some configuration problems here in getting
> the correct header arrangement.
>
> The rest of the build works, and looking around clang is recommended for
> building libcxxabi.
>
> Is this a known problem?
>
> Thanks
>
> John Fletcher
>
>
>
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>
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