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CMake & c++ 编译体系

2024年9月22日修改

2024年3月10日创建

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Summary

1.
入口文件 CMakeLists.txt。是一个 script，从上到下依次执行。​

2.
是 build system generator，不是 build system。生成的东西，可以给 make, Ninja 等用。​

CMake 入门材料，预计需要 1 天时间。

•

CMake - the essential package https://www.youtube.com/watch?v=UH6F6ypdYbw

•

重点是 step 1-4 https://cmake.org/cmake/help/latest/guide/tutorial/index.html

cmake vs Bazel

Bazel is a multi-language build system focused on reproducible builds to enable dependency analysis and caching for fast incremental builds.

CMake v.s. Bazel：

1.
在 llvm 和 mlir 生态里，尽量还是 cmake。遵循社区主流。​

2.
其他情况，bazel 大概率更好用。​

llvm-project 对 Bazel 的支持不太稳定。

Reviewers should not ask authors to update Bazel build files unless the author has opted in to support Bazel. Keeping the Bazel build files up-to-date is on the people who use the Bazel build.​

Cmake

Example

一共 3 个文件:

•
CMakeLists.txt​

•
run.sh​

•
test.cpp​

CMakeLists.txt 的简单例子

代码块

cmake_minimum_required(VERSION 3.20.0)​
​
project(CmakeTutorial-Jack)​
​
# add_executable(${PROJECT_NAME} test.cpp)​
add_executable(b.out test.cpp)​
​
# install(TARGETS b.out DESTINATION bin)​

运行脚本 run.sh

代码块

mkdir -p build && cd build​
​
# Generating Build files​
# -S source dir​
# -B build dir​
cmake -S .. -B .​
# Building CXX object and Linking​
make -j8  # Run make with 8 threads​
# run executable target​
./b.out​

CMake & c++ 编译体系​

CMake & c++ 编译体系