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📝 document FetchContent

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Niels Lohmann 2022-01-30 13:05:18 +01:00
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README.md
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@ -1185,15 +1185,15 @@ target_link_libraries(foo PRIVATE nlohmann_json::nlohmann_json)
Since CMake v3.11,
[FetchContent](https://cmake.org/cmake/help/v3.11/module/FetchContent.html) can
be used to automatically download the repository as a dependency at configure time.
be used to automatically download a release as a dependency at configure time.
Example:
```cmake
include(FetchContent)
FetchContent_Declare(json
GIT_REPOSITORY https://github.com/nlohmann/json.git
GIT_TAG v3.7.3)
URL https://github.com/nlohmann/json/releases/download/v3.10.5/json.tar.xz
)
FetchContent_GetProperties(json)
if(NOT json_POPULATED)
@ -1204,10 +1204,8 @@ endif()
target_link_libraries(foo PRIVATE nlohmann_json::nlohmann_json)
```
**Note**: The repository https://github.com/nlohmann/json download size is huge.
It contains all the dataset used for the benchmarks. You might want to depend on
a smaller repository. For instance, you might want to replace the URL above by
https://github.com/ArthurSonzogni/nlohmann_json_cmake_fetchcontent
**Note**: It is recommended to use the URL approach described above which is supported as of version 3.10.0. See
<https://json.nlohmann.me/integration/cmake/#fetchcontent> for more information.
#### Supporting Both

19
doc/mkdocs/docs/integration/cmake.md
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@ -90,7 +90,7 @@ to the following.
### FetchContent
Since CMake v3.11, [FetchContent](https://cmake.org/cmake/help/v3.11/module/FetchContent.html) can be used to
automatically download the repository as a dependency at configure type.
automatically download a release as a dependency at configure type.
!!! example
@ -101,8 +101,7 @@ automatically download the repository as a dependency at configure type.
include(FetchContent)
FetchContent_Declare(json
GIT_REPOSITORY https://github.com/nlohmann/json
GIT_TAG v3.10.5
URL https://github.com/nlohmann/json/releases/download/v3.10.5/json.tar.xz
)
FetchContent_GetProperties(json)
@ -117,8 +116,18 @@ automatically download the repository as a dependency at configure type.
!!! Note
The repository <https://github.com/nlohmann/json> download size is quite large. You might want to depend on a
smaller repository. For instance, you might want to replace the URL in the example by
It is recommended to use the URL approach described above which is supported as of version 3.10.0. It is also
possible to pass the Git repository like
```cmake
FetchContent_Declare(json
GIT_REPOSITORY https://github.com/nlohmann/json
GIT_TAG v3.10.5
)
```
However, the repository <https://github.com/nlohmann/json> download size is quite large. You might want to depend on
a smaller repository. For instance, you might want to replace the URL in the example by
<https://github.com/ArthurSonzogni/nlohmann_json_cmake_fetchcontent>.
## CMake Options