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# vcpkg_check_linkage
The latest version of this document lives in the [vcpkg repo](https://github.com/Microsoft/vcpkg/blob/master/docs/maintainers/vcpkg_check_linkage.md).
Asserts the available library and CRT linkage options for the port.
## Usage
```cmake
vcpkg_check_linkage(
[ONLY_STATIC_LIBRARY | ONLY_DYNAMIC_LIBRARY]
[ONLY_STATIC_CRT | ONLY_DYNAMIC_CRT]
)
```
## Parameters
### ONLY_STATIC_LIBRARY
Indicates that this port can only be built with static library linkage.
Note: If the user requested a dynamic build ONLY_STATIC_LIBRARY will result in a note being printed, not a fatal error.
### ONLY_DYNAMIC_LIBRARY
Indicates that this port can only be built with dynamic/shared library linkage.
### ONLY_STATIC_CRT
Indicates that this port can only be built with static CRT linkage.
### ONLY_DYNAMIC_CRT
Indicates that this port can only be built with dynamic/shared CRT linkage.
## Notes
This command will either alter the settings for `VCPKG_LIBRARY_LINKAGE` or fail, depending on what was requested by the user versus what the library supports.
## Examples
* [abseil](https://github.com/Microsoft/vcpkg/blob/master/ports/abseil/portfile.cmake)
## Source
[scripts/cmake/vcpkg\_check\_linkage.cmake](https://github.com/Microsoft/vcpkg/blob/master/scripts/cmake/vcpkg_check_linkage.cmake)
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