![]() Then you should repeat all the steps you performed with -fprofile-instr-generate/-fprofile-instr-use. You also need a few additional tricks for LLVM : -femulated-tls and linking pthread. Getting the gcc-style -fprofile-generate/-fprofile-use flags to work correctly requires changing the Clang path and setting -DCMAKE_LINKER to the newly built lld. With the merged profile_merged.profdata file, you can finally build the optimized version of the Clang compiler: This will generate the relevant profiler information, which should later be merged with the tool we built earlier – llvm-profdata. With this CMake configuration, you can build the Clang compiler and use it, for example, to build your own project. Go to Settings/Preferences | Build, Execution, Deployment | CMake: We’ll also use -DLLVM_ENABLE_LTO=Thin for even more optimization. Let’s build LLVM for this experiment, since we already have the source code. With the compiler-rt libraries in place, it’s now possible to use the same toolchain we set up with -fprofile-instr-generate/-fprofile-instr-use flags. ![]() The last step is to replace the binaries in \mingw64\lib\clang\\lib\windows with libraries from \cmake-build-release-mingw_clang\lib\windows or from \lib\clang\\lib\windows in case of monorepo. Luckily we already have the required setup for that build. However, to use all the tools reliably, it’s better to build Clang and lld, as well. ![]() This can be challenging, so the other solution is to clone the LLVM monorepo and build the tools you need.įor -fprofile-instr-generate it might be enough to build only compiler-rt and llvm-profdata to merge the profiler results. One of the options for making this work is to get the compiler-rt source code of exactly the same version as the Clang version in MSYS2. In our case, we wanted to use profile-guided optimization. But Clang requires a compiler that is built with Clang and lld. compiler-rt is a set of runtime libraries which are required to use sanitizers and profiling in Clang, the current compiler_rt package was built with MinGW. However, problems can arise involving compiler-rt. In theory, all Clang tools should also work without any issues. Using advanced tools provided by the Clang compiler You can use either the default ld linker or set the lld with -DCMAKE_LINKER=lld. With your new toolchain configured, you can start building your project. Go to Settings/Preferences | Build, Execution, Deployment | Toolchains: Now we are ready to set up the CLion toolchain. ![]() This clang compiler is built with mingw-w64 and has paths and macros that correspond to this toolchain. Get the necessary packages with the pacman tool. Install MSYS2 from, follow their installation guide. We’ve done some experiments and found a possible workflow that involves using CLion in combination with the MinGW toolchain and Clang compiler. So even when used with the MinGW toolchain, it will still try to include MSVC standard library headers. This is because LLVM Clang for Windows is built using Microsoft Visual Studio, and all the built-in macros and include search paths are set up for use with Visual Studio. While it’s possible to configure Clang with the Mingw-w64 (or MinGW) toolchain, if you decide to use Clang from the LLVM repo, it won’t work correctly. This also means that it’s possible to use Clang with the Mingw-w64 toolchain. With CMake 3.15 it has become possible to use the Clang compiler on Windows with a GNU-style command line. Otherwise, this approach might be even easier to use than the original one explained in this article. Don’t forget that with default build flags you will need to have libc .dll and libunwind.dll in your build directory. You can find the list of all libraries here.Īs a make executable for CLion, you can use clang64/bin/mingw32-make.exe. They use libc and lld by default, and you can get the complete toolchain by getting packages from this page.īe aware that when using libraries built with clang it’s better not to mix them with libraries built with other toolchains. MSYS2 now provides the majority of packages built with clang.
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