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# z_vcpkg_get_cmake_vars
The latest version of this document lives in the [vcpkg repo](https://github.com/Microsoft/vcpkg/blob/master/docs/).
**Only for internal use in vcpkg helpers. Behavior and arguments will change without notice.**
Runs a cmake configure with a dummy project to extract certain cmake variables
## Usage
```cmake
z_vcpkg_get_cmake_vars(<out-var>)
```
`z_vcpkg_get_cmake_vars(cmake_vars_file)` sets `<out-var>` to
a path to a generated CMake file, with the detected `CMAKE_*` variables
re-exported as `VCPKG_DETECTED_*`.
## Notes
Avoid usage in portfiles.
All calls to `z_vcpkg_get_cmake_vars` will result in the same output file;
the output file is not generated multiple times.
## Examples
* [vcpkg_configure_make](https://github.com/Microsoft/vcpkg/blob/master/scripts/cmake/vcpkg_configure_make.cmake)
### Basic Usage
```cmake
z_vcpkg_get_cmake_vars(cmake_vars_file)
include("${cmake_vars_file}")
message(STATUS "detected CXX flags: ${VCPKG_DETECTED_CXX_FLAGS}")
```
## Source
[scripts/cmake/z\_vcpkg\_get\_cmake\_vars.cmake](https://github.com/Microsoft/vcpkg/blob/master/scripts/cmake/z_vcpkg_get_cmake_vars.cmake)
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