[LLVMdev] Building past few days with Clang++ and Clang produces errors on Cmake for Debian Linux
Marc J. Driftmeyer
mjd at reanimality.com
Tue Mar 27 18:14:44 PDT 2012
*System:* Debian Linux Sid/Unstable amd64
*LLVM/Clang:* Trunk
*Scenario:* In the past couple of days I've been compiling against trunk
I get two separate and spurious hang ups with CMake.
*Note:* I build against more than just X86 follow along the progress of
other platforms, though just building for X86 produces the same results
below.
*Assumption:* Configure cmake with prior built clang and clang++ via
gcc-4.6.3 under /usr/local/bin... /clang .../clang++ as follows:
> mdriftmeyer at horus:~/DeveloperProjects/LLVMProject/cmake-llvm$ cmake
> -DCMAKE_BUILD_TYPE=MinSizeRel
> -DCMAKE_CXX_COMPILER=/usr/local/bin/clang++
> -DCMAKE_C_COMPILER=/usr/local/bin/clang -DCMAKE_CXX_FLAGS='-O2'
> CMAKE_C_FLAGS='-O2' -DLLVM_BUILD_EXAMPLES=ON -DLLVM_BUILD_TESTS=ON
> -DLLVM_INCLUDE_TESTS=ON
> -DLLVM_TARGETS_TO_BUILD='ARM;CppBackend;PTX;Hexagon;X86' ../trunk/llvm/
> -- Target triple: x86_64-unknown-linux-gnu
> -- Native target architecture is X86
> -- Threads enabled.
> -- Building with -fPIC
> -- Constructing LLVMBuild project information
> -- Targeting ARM
> -- Targeting CppBackend
> -- Targeting PTX
> -- Targeting Hexagon
> -- Targeting X86
> -- Clang version: 3.1
> -- Configuring done
> You have changed variables that require your cache to be deleted.
> Configure will be re-run and you may have to reset some variables.
> The following variables have changed:
> CMAKE_C_COMPILER= /usr/local/bin/clang
> CMAKE_CXX_COMPILER= /usr/local/bin/clang++
>
> -- The C compiler identification is Clang
> -- The CXX compiler identification is Clang
> -- Check for working C compiler: /usr/local/bin/clang
> -- Check for working C compiler: /usr/local/bin/clang -- works
> -- Detecting C compiler ABI info
> -- Detecting C compiler ABI info - done
> -- Check for working CXX compiler: /usr/local/bin/clang++
> -- Check for working CXX compiler: /usr/local/bin/clang++ -- broken
> CMake Error at
> /usr/share/cmake-2.8/Modules/CMakeTestCXXCompiler.cmake:45 (MESSAGE):
> The C++ compiler "/usr/local/bin/clang++" is not able to compile a
> simple
> test program.
>
> It fails with the following output:
>
> Change Dir:
> /home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm/CMakeFiles/CMakeTmp
>
>
>
> Run Build Command:/usr/bin/make "cmTryCompileExec/fast"
>
> /usr/bin/make -f CMakeFiles/cmTryCompileExec.dir/build.make
> CMakeFiles/cmTryCompileExec.dir/build
>
> make[1]: Entering directory
>
> `/home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm/CMakeFiles/CMakeTmp'
>
>
> /usr/bin/cmake -E cmake_progress_report
>
> /home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm/CMakeFiles/CMakeTmp/CMakeFiles
> 1
>
> Building CXX object
> CMakeFiles/cmTryCompileExec.dir/testCXXCompiler.cxx.o
>
> /usr/local/bin/clang++ -o
> CMakeFiles/cmTryCompileExec.dir/testCXXCompiler.cxx.o -c
>
> /home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
>
>
> Linking CXX executable cmTryCompileExec
>
> /usr/bin/cmake -E cmake_link_script
> CMakeFiles/cmTryCompileExec.dir/link.txt --verbose=1
>
> /usr/local/bin/clang++
> CMakeFiles/cmTryCompileExec.dir/testCXXCompiler.cxx.o -o
> cmTryCompileExec
> -rdynamic
>
> /usr/bin/ld: error: cannot find -lstdc++
>
> clang-3: error: linker command failed with exit code 1 (use -v to see
> invocation)
>
> make[1]: Leaving directory
>
> `/home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm/CMakeFiles/CMakeTmp'
>
>
> make[1]: *** [cmTryCompileExec] Error 1
>
> make: *** [cmTryCompileExec/fast] Error 2
>
>
>
>
>
> CMake will not be able to correctly generate this project.
> Call Stack (most recent call first):
> CMakeLists.txt:3 (project)
>
>
> -- Configuring incomplete, errors occurred!
> mdriftmeyer at horus:~/DeveloperProjects/LLVMProject/cmake-llvm$
Now out of curriousity I change clang++ to clang-3.1 which of course has
two symlinks [clang and clang++] under /usr/local/bin
If I configure and attempt to make against the following:
> mdriftmeyer at horus:~/DeveloperProjects/LLVMProject/cmake-llvm$ cmake
> -DCMAKE_BUILD_TYPE=MinSizeRel
> -DCMAKE_CXX_COMPILER=/usr/local/bin/clang-3.1
> -DCMAKE_C_COMPILER=/usr/local/bin/clang-3.1 -DCMAKE_CXX_FLAGS='-O2'
> CMAKE_C_FLAGS='-O2' -DLLVM_BUILD_EXAMPLES=ON -DLLVM_BUILD_TESTS=ON
> -DLLVM_INCLUDE_TESTS=ON
> -DLLVM_TARGETS_TO_BUILD='ARM;CppBackend;PTX;Hexagon;X86' ../trunk/llvm/
> -- Target triple: x86_64-unknown-linux-gnu
> -- Native target architecture is X86
> -- Threads enabled.
> -- Building with -fPIC
> -- Constructing LLVMBuild project information
> -- Targeting ARM
> -- Targeting CppBackend
> -- Targeting PTX
> -- Targeting Hexagon
> -- Targeting X86
> -- Clang version: 3.1
> -- Configuring done
> -- Generating done
> -- Build files have been written to:
> /home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm
> mdriftmeyer at horus:~/DeveloperProjects/LLVMProject/cmake-llvm$
*Result:*
> mdriftmeyer at horus:~/DeveloperProjects/LLVMProject/cmake-llvm$ make -j3
> Scanning dependencies of target LLVMHello
> [ 0%] Building CXX object
> lib/Transforms/Hello/CMakeFiles/LLVMHello.dir/Hello.cpp.o
> Scanning dependencies of target profile_rt-shared
> Scanning dependencies of target LLVMSupport
> [ 0%] Building C object
> runtime/libprofile/CMakeFiles/profile_rt-shared.dir/BasicBlockTracing.c.o
> In file included from
> /home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/lib/Transforms/Hello/Hello.cpp:16:
> */home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/include/llvm/Pass.h:32:10:
> fatal error: 'string'
> file not found
> #include <string>*
> ^
> [ 0%] Building CXX object
> lib/Support/CMakeFiles/LLVMSupport.dir/APFloat.cpp.o
> [ 0%] Building C object
> runtime/libprofile/CMakeFiles/profile_rt-shared.dir/CommonProfiling.c.o
> In file included from
> /home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/lib/Support/APFloat.cpp:15:
>
> In file included from
> /home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/include/llvm/ADT/APFloat.h:104:
> In file included from
> /home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/include/llvm/ADT/APInt.h:18:
> In file included from
> /home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/include/llvm/ADT/ArrayRef.h:13:
> In file included from
> /home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/include/llvm/ADT/SmallVector.h:17:
> In file included from
> /home/mdriftmeyer/DeveloperProjects/LLVMProject/trunk/llvm/include/llvm/Support/type_traits.h:20:
> */home/mdriftmeyer/DeveloperProjects/LLVMProject/cmake-llvm/include/llvm/Support/DataTypes.h:36:10:
> fatal error:
> 'cmath' file not found
> #include <cmath>*
> ^
> [ 0%] Building C object
> runtime/libprofile/CMakeFiles/profile_rt-shared.dir/GCDAProfiling.c.o
> [ 0%] Building C object
> runtime/libprofile/CMakeFiles/profile_rt-shared.dir/PathProfiling.c.o
> 1 error generated.
> make[2]: ***
> [lib/Transforms/Hello/CMakeFiles/LLVMHello.dir/Hello.cpp.o] Error 1
> make[1]: *** [lib/Transforms/Hello/CMakeFiles/LLVMHello.dir/all] Error 2
> make[1]: *** Waiting for unfinished jobs....
> 1 error generated.
> [ 0%] make[2]: ***
> [lib/Support/CMakeFiles/LLVMSupport.dir/APFloat.cpp.o] Error 1
> make[1]: *** [lib/Support/CMakeFiles/LLVMSupport.dir/all] Error 2
> [ 0%] Building C object
> runtime/libprofile/CMakeFiles/profile_rt-shared.dir/EdgeProfiling.c.o
> Building C object
> runtime/libprofile/CMakeFiles/profile_rt-shared.dir/OptimalEdgeProfiling.c.o
>
> Linking C shared library ../../lib/profile_rt.so
> [ 0%] Built target profile_rt-shared
> make: *** [all] Error 2
> mdriftmeyer at horus:~/DeveloperProjects/LLVMProject/cmake-llvm$
Of course if I configure as follows:;
> mdriftmeyer at horus:~/DeveloperProjects/LLVMProject/cmake-llvm$ cmake
> -DCMAKE_BUILD_TYPE=MinSizeRel -DCMAKE_CXX_COMPILER=/usr/bin/g++
> -DCMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_CXX_FLAGS='-O2'
> CMAKE_C_FLAGS='-O2' -DLLVM_BUILD_EXAMPLES=ON -DLLVM_BUILD_TESTS=ON
> -DLLVM_INCLUDE_TESTS=ON
> -DLLVM_TARGETS_TO_BUILD='ARM;CppBackend;PTX;Hexagon;X86' ../trunk/llvm/
*Results:* after rebuilding the cache and rerunning the configuration
twice the end is that LLVM/Clang *builds cleanly*. None of the noise
above about clang++ failing to be able to build a simple c++ program nor
the missing string and cmath header files.
Perhaps this is just a Debian Linux issue and has to do with upgrades to
LSB 4.1 [Linux Standard Base 4.1], but then I don't know enough about
LSB to know exactly how a compiler infrastructure would be impacted by
it, if at all.
[http://www.linuxfoundation.org/collaborate/workgroups/lsb/lsb-41-release-notes]
NOTE: (The work on Libc++ under libcxx being put under /runtime and
recognized by Cmake is still not working, from what I've seen, though
work on it around 2 weeks prior was mentioned it would get added for Linux)
- Marc
--
Marc J. Driftmeyer
Email :: mjd at reanimality.com <mailto:mjd at reanimality.com>
Web :: http://www.reanimality.com
Cell :: (509) 435-5212
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