CMake & Ninja

CMakeLists.txt

cmake_minimum_required(VERSION 3.0)

project(a.out C)

# 設置SRC變量，包含目錄下的源文件，不包括子目錄
aux_source_directory(src SRC)
aux_source_directory(src/lib SRC)

set(
    SRC

    ${SRC}  # 向SRC變量追加內容
    src/main.c
)
message(STATUS "SRC -> " "${SRC}")  # 打印變量

set(EXECUTABLE_OUTPUT_PATH ..)  # 設置可執行文件輸出路徑

add_executable("${PROJECT_NAME}" "${SRC}")

執行CMake，生成Ninja腳本

$ cmake -G Ninja -B bin
-- The C compiler identification is GNU 10.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/cygwin64/bin/cc.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- SRC -> src/main.c;src/lib/foo.c;src/main.c
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Users/ly/Desktop/rust/c/bin

再次運行，工作量明顯減少了，同時也不用再使用-G參數聲明生成器了：

$ cmake -B bin
-- SRC -> src/main.c;src/lib/foo.c;src/main.c
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Users/ly/Desktop/rust/c/bin

執行Ninja

$ ninja -C bin
ninja: Entering directory `bin'
[3/3] Linking C executable ..\a.out.exe

當修改了CMakeLists.txt后，無需再次CMake，ninja會重新運行它：

ninja -C bin
ninja: Entering directory `bin'
[0/1] Re-running CMake...
-- SRC -> src/main.c;src/lib/foo.c;src/main.c
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Users/ly/Desktop/rust/c/bin
[3/3] Linking C executable ..\a.exe

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