Go toolchain internals and implementation based on arm64 Wei Xiao (肖玮) Arm Staff Software Engineer Wei.Xiao@arm.com ’ alt=‘OCR图片’/> Go toolchain overview A toolchain is a package composed of the compiler together allow you to build and run code written in that language. gc: evolved from the Plan 9 toolchain and includes its own compiler, assembler, linker and tools, as well as the Go runtime and standard to support Go. llgo: built on top of the LLVM compiler infrastructure. ’ alt=‘OCR图片’/> Go toolchain example $go build -x helloworld.go /golang/pkg/tool/linux_arm64/compile -o $WORK/b001/pkg.a -trimpath

Toolchains are the new, experimental way to integrate with build systems in Conan. Recipes can define a toolchain() method that will return an object which can generate files from the current configuration that still use a toolchain. A toolchain can be defined, among the built-ins toolchains, with an attribute: toolchain = "cmake" Note: At the moment (Conan 1.26), the only available toolchain is the CMake beyond the default one: from conans import CMakeToolchain def toolchain(self): tc = CMakeToolchain(self) # customize toolchain "tc" return tc Toolchains have some important advantages:

important method. In this case, the execution of CMakeToolchain generate() method will create a conan_toolchain.cmake file that maps the Conan settings and options to CMake syntax. • The build() method uses CMake commands, it is a thin layer that will manage to pass in this case the -DCMAKE_TOOLCHAIN_FILE=conan_toolchain.cmake argument, plus other possible arguments, like -DCMAKE_BUILD_TYPE= if necessary not need a generator, but can still use a toolchain. A toolchain can be defined, among the built-ins toolchains, with an attribute with the name of the toolchain class to use. generators = ""

library files are installed and CMakeToolchain to pass build information to CMake using a CMake toolchain file. Besides the conanfile.txt, we need a Conan profile to build our project. Conan profiles allow CMake finds the Zlib library we have just downloaded. On the other side, CMakeToolchain generates a toolchain file for CMake so that we can transparently build our project with CMake using the same settings matches your default →profile $ cmake .. -G "Visual Studio 15 2017" -DCMAKE_TOOLCHAIN_FILE="conan_toolchain.cmake" $ cmake --build . --config Release [100%] Built target compressor $ Release\compressor

library files are installed and CMakeToolchain to pass build information to CMake using a CMake toolchain file. Besides the conanfile.txt, we need a Conan profile to build our project. Conan profiles allow CMake finds the Zlib library we have just downloaded. On the other side, CMakeToolchain generates a toolchain file for CMake so that we can transparently build our project with CMake using the same settings matches your default, →profile $ cmake .. -G "Visual Studio 15 2017" -DCMAKE_TOOLCHAIN_FILE="conan_toolchain.cmake" $ cmake --build . --config Release [100%] Built target compressor $ Release\compressor

library files are installed and CMakeToolchain to pass build information to CMake using a CMake toolchain file. Besides the conanfile.txt, we need a Conan profile to build our project. Conan profiles allow CMake finds the Zlib library we have just downloaded. On the other side, CMakeToolchain generates a toolchain file for CMake so that we can transparently build our project with CMake using the same settings matches your default, →profile $ cmake .. -G "Visual Studio 15 2017" -DCMAKE_TOOLCHAIN_FILE="conan_toolchain.cmake" $ cmake --build . --config Release [100%] Built target compressor $ Release\compressor

library files are installed and CMakeToolchain to pass build information to CMake using a CMake toolchain file. Besides the conanfile.txt, we need a Conan profile to build our project. Conan profiles allow CMake finds the Zlib library we have just downloaded. On the other side, CMakeToolchain generates a toolchain file for CMake so that we can transparently build our project with CMake using the same settings matches your default →profile $ cmake .. -G "Visual Studio 15 2017" -DCMAKE_TOOLCHAIN_FILE="conan_toolchain.cmake" $ cmake --build . --config Release [100%] Built target compressor $ Release\compressor

library files are installed and CMakeToolchain to pass build information to CMake using a CMake toolchain file. Besides the conanfile.txt, we need a Conan profile to build our project. Conan profiles allow CMake finds the Zlib library we have just downloaded. On the other side, CMakeToolchain generates a toolchain file for CMake so that we can transparently build our project with CMake using the same settings matches your default, →profile $ cmake .. -G "Visual Studio 15 2017" -DCMAKE_TOOLCHAIN_FILE="conan_toolchain.cmake" $ cmake --build . --config Release [100%] Built target compressor $ Release\compressor

library files are installed and CMakeToolchain to pass build information to CMake using a CMake toolchain file. Besides the conanfile.txt, we need a Conan profile to build our project. Conan profiles allow CMake finds the Zlib library we have just downloaded. On the other side, CMakeToolchain generates a toolchain file for CMake so that we can transparently build our project with CMake using the same settings matches your default →profile $ cmake .. -G "Visual Studio 15 2017" -DCMAKE_TOOLCHAIN_FILE="conan_toolchain.cmake" $ cmake --build . --config Release [100%] Built target compressor $ Release\compressor

library files are installed and CMakeToolchain to pass build information to CMake using a CMake toolchain file. Besides the conanfile.txt, we need a Conan profile to build our project. Conan profiles allow CMake finds the Zlib library we have just downloaded. On the other side, CMakeToolchain generates a toolchain file for CMake so that we can transparently build our project with CMake using the same settings matches your default →profile $ cmake .. -G "Visual Studio 15 2017" -DCMAKE_TOOLCHAIN_FILE="conan_toolchain.cmake" $ cmake --build . --config Release [100%] Built target compressor $ Release\compressor