![]() Once you have a compiler (MSVC, gcc, or Clang) with support for p1689, you are ready to try building a CMake project with modules and the ninja build tool. Set(CMAKE_CXX_EXTENSIONS OFF) Hello world C 20 Modules in CMake Set(CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP 1) With clang 16 or newer CMake has the scan process file built in and you will only need the following code to activate it: set(CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API "2182bf5c-ef0d-489a-91da-49dbc3090d2a") llvm # note, the ninja build tool is faster than the make tool referenced in the docs. Which basically, involve creating a build directory and running CMake to configure the tree: cmake -DLLVM_ENABLE_PROJECTS=clang -DCMAKE_BUILD_TYPE=Release -G Ninja. Once you have the source code, you can follow build instructions found here: CLANGįor the clang compiler version 16 or newer contains the p1689 implementation required for CMake: This is because sprintf is deprecated in the mac system header files causing a few warnings that will break the build if Werror is on. with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk configure -prefix=$HOME/Work/modules/gcc-inst \ ![]() There are some good build instructions for the mac that can be found here:ĭownload prerequisites and configure a build tree, make and make install like this. ![]() Then just apply the patch to the gcc for arm64 source tree using the patch command: cd gcc-darwin-arm64 You can do that by downloading the patch for the commit with the changes: You then need to apply the patch from the gcc fork implementing p1689 ![]() m1 mac gccįor m1 macs, you will need to get a patched gcc that supports arm64. I would recommend installing into a directory that is writable by your user such as ~/gcc-install or other. Linuxįor Linux platforms and intel macs, just download and build gcc from the fork. Once you have the source for GCC you can build it, there are a few extra hoops for m1 macs described below. class foo -fmodule-mapper=")Ī recent version of this can be found in the ci code for cmake in gitlab here: cxx file that contains the non-inline implementation functions for the class. h file that contains the class declaration, and a. For a quick example, a common way to define a class in C would be to have two files: a. What are modules and why are they difficult for build systems to handle? C modules are a replacement for the preprocessor and #include. Header modules are not covered in this blog. This blog describes the process that was taken and the current state of named C 20 modules in CMake. In 2019 with news of modules being added to C , the Kitware fork of ninja was rejoined with upstream ninja and dynamic dependencies were added to ninja. In 2015, support was added to the ninja build tool to support Fortran modules. Fortunately, CMake has supported Fortran modules since 2005. Gyp, CMake, Meson, and gn are popular build management software tools which support creating build files for Ninja.Work is underway to implement support for C 20 modules in CMake! Since the C standards committee started talking about adding modules to the C language, the CMake team at Kitware has been thinking about how they will be supported. Instead, a "build generator" should be used to generate Ninja build files. In contrast to Make, Ninja lacks features such as string manipulation, as Ninja build files are not meant to be written by hand. It's also used to build Android (via Makefile translation by Kati), and is used by most developers working on LLVM. In fact, Google Chrome is a main user and motivation for Ninja. This can considerably slow down developers working on large projects, such as Google Chrome which compiles 40,000 input files into a single executable. In essence, Ninja is meant to replace Make, which is slow when performing incremental (or no-op) builds. Ninja has a focus on speed and it differs from other build systems in two major respects: it is designed to have its input files generated by a higher-level build system, and it is designed to run builds as fast as possible. Ninja is a small build system developed by Evan Martin, a Google employee.
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