c2lang
Building on OS X: LLVM, flags
I wanted to try out c2 and went ahead and tried to build right away. Well, this is unfortunately what happened:
[email protected] ~/W/g/c/out $ cmake .. -G Ninja -DCMAKE_CXX_COMPILER="/usr/local/opt/llvm/bin/clang++" -DCMAKE_C_COMPILER=/usr/local/opt/llvm/bin/clang -DCMAKE_CXX_FLAGS="-I /usr/local/opt/llvm/include -std=c++11" -DCMAKE_EXE_LINKER_FLAGS="-L /usr/local/opt/llvm/lib"
-- The CXX compiler identification is Clang 7.0.1
-- Check for working CXX compiler: /usr/local/opt/llvm/bin/clang++
-- Check for working CXX compiler: /usr/local/opt/llvm/bin/clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/Ingwie/Work/git/c2compiler/out
[email protected] ~/W/g/c/out $ ninja
[98/98] Linking CXX executable c2c/c2c
FAILED: c2c/c2c
: && clang++ -I /usr/local/opt/llvm/include -std=c++11 -O3 -DNDEBUG -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -Wl,-search_paths_first -Wl,-headerpad_max_install_names -L /usr/local/opt/llvm/lib c2c/CMakeFiles/c2c.dir/main.cpp.o -o c2c/c2c c2c/libc2core.a -lncurses && :
Undefined symbols for architecture x86_64:
"llvm::AllocaInst::setAlignment(unsigned int)", referenced from:
...big snip...
What I had to do beforehand was to install LLVM via Homebrew (brew install llvm). Now, what I am guessing is that there are a lot of flags missing, possibly due to llvm-config not being in my $PATH by default. I would suggest you to use the LLVM CMake files.
[email protected] ~/W/g/c/out $ tree /usr/local/opt/llvm/share/cmake/
/usr/local/opt/llvm/share/cmake/
└── [ 928] modules
├── [ 61K] AddLLVM.cmake
├── [ 585] AddLLVMDefinitions.cmake
├── [7.6K] AddOCaml.cmake
├── [3.4K] AddSphinxTarget.cmake
├── [5.7K] CMakeLists.txt
├── [3.4K] CheckAtomic.cmake
├── [2.2K] CheckCompilerVersion.cmake
├── [ 193] CheckLinkerFlag.cmake
├── [3.8K] ChooseMSVCCRT.cmake
├── [2.9K] CrossCompile.cmake
├── [ 470] DetermineGCCCompatible.cmake
├── [ 724] FindLibpfm.cmake
├── [2.3K] FindOCaml.cmake
├── [ 939] FindSphinx.cmake
├── [1.2K] GenerateVersionFromCVS.cmake
├── [ 857] GetHostTriple.cmake
├── [4.8K] GetSVN.cmake
├── [ 38K] HandleLLVMOptions.cmake
├── [1.0K] HandleLLVMStdlib.cmake
├── [ 12K] LLVM-Config.cmake
├── [2.8K] LLVMConfig.cmake.in
├── [ 533] LLVMConfigVersion.cmake.in
├── [8.7K] LLVMExternalProjectUtils.cmake
├── [ 564] LLVMInstallSymlink.cmake
├── [3.5K] LLVMProcessSources.cmake
├── [7.2K] TableGen.cmake
└── [3.3K] VersionFromVCS.cmake
Could save you some troubble. :)
I'll try and see if I can find a workaround here. By looking at my CMake invocation above, you can already see a bit of that.
Well, here we are.
My workaround was to utilize environment variables, since string-substitution in the fish shell is not that great. So here is a direct copy of what I did:
[email protected] ~/W/g/c/out $ set LLVM_LIBS (/usr/local/opt/llvm/bin/llvm-config --libs)
[email protected] ~/W/g/c/out $ set LLVM_CFLAGS (/usr/local/opt/llvm/bin/llvm-config --cflags)
[email protected] ~/W/g/c/out $ set LLVM_CXXFLAGS (/usr/local/opt/llvm/bin/llvm-config --cxxflags)
[email protected] ~/W/g/c/out $ set LLVM_LDFLAGS (/usr/local/opt/llvm/bin/llvm-config --ldflags)
[email protected] ~/W/g/c/out $ rm -rf *
[email protected] ~/W/g/c/out $ cmake .. -G Ninja -DCMAKE_CXX_COMPILER="/usr/local/opt/llvm/bin/clang++" -DCMAKE_C_COMPILER=/usr/local/opt/llvm/bin/clang -DCMAKE_CXX_FLAGS="-I /usr/local/opt/llvm/include -std=c++11 $LLVM_CXXFLAGS" -DCMAKE_EXE_LINKER_FLAGS="$LLVM_LDFLAGS $LLVM_LIBS"
-- The CXX compiler identification is Clang 7.0.1
-- Check for working CXX compiler: /usr/local/opt/llvm/bin/clang++
-- Check for working CXX compiler: /usr/local/opt/llvm/bin/clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/Ingwie/Work/git/c2compiler/out
[email protected] ~/W/g/c/out $ ninja
[57/98] Building CXX object c2c/CMakeFiles/c2core.dir/Analyser/FunctionAnalyser.cpp.o
../c2c/Analyser/FunctionAnalyser.cpp:2178:21: warning: variable length arrays are a C99 feature [-Wvla-extension]
char enumHandled[ETD->numConstants()];
^
1 warning generated.
[67/98] Building CXX object c2c/CMakeFiles/c2core.dir/Algo/TagWriter.cpp.o
../c2c/Algo/TagWriter.cpp:197:18: warning: variable length arrays are a C99 feature [-Wvla-extension]
char* offsets[files.size()];
^
1 warning generated.
[92/98] Building CXX object tools/CMakeFiles/tester.dir/tester/main.cpp.o
../tools/tester/main.cpp:1183:29: warning: cast from 'const char *' to 'char *' drops const qualifier [-Wcast-qual]
char* end = (char*) &target[strlen(target) -1];
^
1 warning generated.
[98/98] Linking CXX executable c2c/c2c
Hope it helps!
Hi ,
I'll look into it. I dont have my Macbook with me now, but this afternoon I should have some time for it..
On Mon, Feb 4, 2019 at 2:52 AM Ingwie Phoenix [email protected] wrote:
Well, here we are.
My workaround was to utilize environment variables, since string-substitution in the fish shell is not that great. So here is a direct copy of what I did:
[email protected] ~/W/g/c/out $ set LLVM_LIBS (/usr/local/opt/llvm/bin/llvm-config --libs) [email protected] ~/W/g/c/out $ set LLVM_CFLAGS (/usr/local/opt/llvm/bin/llvm-config --cflags) [email protected] ~/W/g/c/out $ set LLVM_CXXFLAGS (/usr/local/opt/llvm/bin/llvm-config --cxxflags) [email protected] ~/W/g/c/out $ set LLVM_LDFLAGS (/usr/local/opt/llvm/bin/llvm-config --ldflags) [email protected] ~/W/g/c/out $ rm -rf * [email protected] ~/W/g/c/out $ cmake .. -G Ninja -DCMAKE_CXX_COMPILER="/usr/local/opt/llvm/bin/clang++" -DCMAKE_C_COMPILER=/usr/local/opt/llvm/bin/clang -DCMAKE_CXX_FLAGS="-I /usr/local/opt/llvm/include -std=c++11 $LLVM_CXXFLAGS" -DCMAKE_EXE_LINKER_FLAGS="$LLVM_LDFLAGS $LLVM_LIBS" -- The CXX compiler identification is Clang 7.0.1 -- Check for working CXX compiler: /usr/local/opt/llvm/bin/clang++ -- Check for working CXX compiler: /usr/local/opt/llvm/bin/clang++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Detecting CXX compile features -- Detecting CXX compile features - done -- Configuring done -- Generating done -- Build files have been written to: /Users/Ingwie/Work/git/c2compiler/out [email protected] ~/W/g/c/out $ ninja [57/98] Building CXX object c2c/CMakeFiles/c2core.dir/Analyser/FunctionAnalyser.cpp.o ../c2c/Analyser/FunctionAnalyser.cpp:2178:21: warning: variable length arrays are a C99 feature [-Wvla-extension] char enumHandled[ETD->numConstants()]; ^ 1 warning generated. [67/98] Building CXX object c2c/CMakeFiles/c2core.dir/Algo/TagWriter.cpp.o ../c2c/Algo/TagWriter.cpp:197:18: warning: variable length arrays are a C99 feature [-Wvla-extension] char* offsets[files.size()]; ^ 1 warning generated. [92/98] Building CXX object tools/CMakeFiles/tester.dir/tester/main.cpp.o ../tools/tester/main.cpp:1183:29: warning: cast from 'const char ' to 'char ' drops const qualifier [-Wcast-qual] char end = (char) &target[strlen(target) -1]; ^ 1 warning generated. [98/98] Linking CXX executable c2c/c2c
Hope it helps!
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If you need anything tested on a Mac, feel free to ask. :)
Also: Travis offers building on OS X as well. So technically, you can use that too.