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FetchContent

https://cmake.org/cmake/help/latest/module/FetchContent.html

zip, tar などを Download して展開する、もしくは git clone などする。

include(FetchContent)

CMakeLists.txt がある場合​

FetchContent_MakeAvailable​

FetchContent_Declare(zlib URL https://zlib.net/zlib-1.3.1.tar.gz)
FetchContent_MakeAvailable(zlib)
note

subfolder は SOURCE_SUBDIR

include(FetchContent)
FetchContent_Declare(
  protobuf
  GIT_REPOSITORY https://github.com/protocolbuffers/protobuf.git
  GIT_TAG        ae50d9b9902526efd6c7a1907d09739f959c6297 # v3.15.0
  SOURCE_SUBDIR  cmake
)
set(protobuf_BUILD_TESTS OFF CACHE INTERNAL "")

CMakeLists.txt が無い場合​

FetchContent_Populate​

FetchContent_Populate(
  stb URL https://github.com/nothings/stb/archive/refs/heads/master.zip)
add_library(stb INTERFACE)
target_include_directories(stb INTERFACE ${stb_SOURCE_DIR})
target_compile_definitions(stb INTERFACE STB_IMAGE_IMPLEMENTATION)

その他​

warning

DOWNLOAD_EXTRACT_TIMESTAMP

include(FetchContent)
FetchContent_Declare(
  googletest
  DOWNLOAD_EXTRACT_TIMESTAMP ON  # 追加
  URL https://github.com/google/googletest/archive/03597a01ee50ed33e9dfd640b249b4be3799d395.zip
)

Cmakeにて'The DOWNLOAD_EXTRACT_TIMESTAMP option was not given and policy CMP0135 is not set.'という警告が表示されたことについて #C++ - Qiita

danger

At least one entry of URL is a path

CMake Error: At least one entry of URL is a path (invalid in a list)

https://stackoverflow.com/questions/74996365/cmake-error-at-least-one-entry-of-url-is-a-path-invalid-in-a-list

tip

https://cmake.org/cmake/help/latest/module/FetchContent.html#variable:FETCHCONTENT_TRY_FIND_PACKAGE_MODE

find_packge して、無かったら fetch_content するには？