To the compiler, or to the compiler name if it is in the PATH. Variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path If not, you may have to use, for example, g++-11 -version or even specify the full path. Tell CMake where to find the compiler by setting either the environment After installing, g++ -version should print the desired GCC version. Is not a full path to an existing compiler tool. It can be done like this: set (CMAKETHREADPREFERPTHREAD TRUE) set (THREADSPREFERPTHREADFLAG TRUE) findpackage (Threads REQUIRED) addexecutable (test test.cpp) targetlinklibraries (test Threads::Threads) Use of the imported target is highly recommended for new code, according to the CMake docs. The CXX compiler identification is unknownĬMake Error at CMakeLists.txt:42 (project): src/configure -v -with-pkgversion='Ubuntu 8.4.0-1ubuntu1~18.04' -with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs -enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ -prefix=/usr -with-gcc-major-version-only -program-suffix=-8 -program-prefix=x86_64-linux-gnu-enable-shared -enable-linker-build-id -libexecdir=/usr/lib -without-included-gettext -enable-threads=posix -libdir=/usr/lib -enable-nls -enable-clocale=gnu -enable-libstdcxx-debug -enable-libstdcxx-time=yes -with-default-libstdcxx-abi=new -enable-gnu-unique-object -disable-vtable-verify -enable-libmpx -enable-plugin -enable-default-pie -with-system-zlib -with-target-system-zlib=auto -enable-objc-gc=auto -enable-multiarch -disable-werror -with-arch-32=i686 -with-abi=m64 -with-multilib-list=m32,m64,mx32 -enable-multilib -with-tune=generic -enable-offload-targets=nvptx-none -without-cuda-driver -enable-checking=release -build=x86_64-linux-gnu -host=x86_64-linux-gnu -target=x86_64-linux-gnu Sudo update-alternatives -install /usr/bin/gcc gcc /usr/bin/gcc-8 800 -slave /usr/bin/g++ g++ /usr/bin/g++-8ĬOLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapperĬonfigured with. Sudo update-alternatives -install /usr/bin/gcc gcc /usr/bin/gcc-7 700 -slave /usr/bin/g++ g++ /usr/bin/g++-7 To try to get the v8 to be default I did: It keeps thinga cleaner and simple.I have Ubuntu 18.04.6 LTS and I am trying to install and run gcc v8 (a v7 version is the default). It is also probably a good idea to avoid passing -I/-isystem for directories that the compiler already assumes as default include directories. Perhaps it makes sense to introduce this change in CMake itself, as I think it may be useful for everybody. ![]() Doing so would take precedence over any value stored in the CXX environment variable: Enter build directory and remove all files (clean) cd build & rm -fr Read configuration and set g++ compiler. On the WebKit project we work-around'ed this by calling GCC at run-time to obtain the list of system includes, to automatically add this directories to the above variables. Alternatively, a compiler can be specified on the command line by explicitly setting CMAKECXXCOMPILER. So CMake automatically filters /usr/include from the list of includes when calling the compiler.īut when cross-compiling or when using a non-default system include directory, the build breaks. This toolchain file example has been setup to automatically find the RISC-V GCC cross compiler. CMake Error: your CXX compiler: 'C:/MinGW/bin/g++' was not found. Please set CMAKECCOMPILER to a valid compiler path or name. ![]() Call Stack (most recent call first): CMakeLists.txt:10 (project) CMake Error: your C compiler: 'C:/MinGW/bin/gcc' was not found. ![]() This didn't broke the 99% of the standard builds because CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES and CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES already default to /usr/include. One of the cannonical isa definition strings must be set here. CMake will not be able to correctly generate this project. GCC 6 has introduced a change that broke some C++ projects when the project uses system includes (-isystem) via passing the parameter SYSTEM to CMake's functions include_directories or target_include_directories.
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