mirror of
https://github.com/microsoft/vcpkg.git
synced 2024-12-26 07:37:56 +08:00
c06dfc0ac2
* [docs] Add Authoring-script-ports.md * Address CR comments * Update docs/maintainers/authoring-script-ports.md Co-authored-by: nicole mazzuca <83086508+strega-nil-ms@users.noreply.github.com> Co-authored-by: nicole mazzuca <83086508+strega-nil-ms@users.noreply.github.com>
46 lines
2.2 KiB
Markdown
46 lines
2.2 KiB
Markdown
# Authoring Script Ports
|
|
|
|
Ports can expose functions for other ports to consume during their build. For
|
|
example, the `vcpkg-cmake` helper port exposes the `vcpkg_cmake_configure()`
|
|
helper function. Packaging common scripts into a shared helper port makes
|
|
maintenance easier because all consumers can be updated from a single place.
|
|
Because the scripts come from a port, they can be versioned and depended upon
|
|
via all the same mechanisms as any other port.
|
|
|
|
Script ports are implemented via the `vcpkg-port-config.cmake` extension
|
|
mechanism. Before invoking the `portfile.cmake` of a port, vcpkg will first
|
|
import `share/<port>/vcpkg-port-config.cmake` from each direct dependency. If
|
|
the direct dependency is a host dependency, the import will be performed in the
|
|
host installed tree (e.g.
|
|
`${HOST_INSTALLED_DIR}/share/<port>/vcpkg-port-config.cmake`).
|
|
|
|
Only direct dependencies are considered for `vcpkg-port-config.cmake` inclusion.
|
|
This means that if a script port relies on another script port, it must
|
|
explicitly import the `vcpkg-port-config.cmake` of its dependency.
|
|
|
|
Script-to-script dependencies should not be marked as host. The dependency from
|
|
a target port to a script should be marked host, which means that scripts should
|
|
always already be natively compiling. By making script-to-script dependencies
|
|
`"host": false`, it ensures that one script can depend upon the other being in
|
|
its same install directory.
|
|
|
|
Ports should never provide a `vcpkg-port-config.cmake` file under a different
|
|
`share/` subdirectory than the current port (`${PORT}`).
|
|
|
|
## Example
|
|
|
|
```cmake
|
|
# ${CURRENT_PACKAGES_DIR}/share/my-helper/vcpkg-port-config.cmake
|
|
|
|
# This include guard ensures the file will be loaded only once
|
|
include_guard(GLOBAL)
|
|
|
|
# This is how you could pull in a transitive dependency
|
|
include("${CMAKE_CURRENT_LIST_DIR}/../my-other-helper/vcpkg-port-config.cmake")
|
|
|
|
# Finally, it is convention to put each public function into a separate file with a matching name
|
|
include("${CMAKE_CURRENT_LIST_DIR}/my_helper_function_01.cmake")
|
|
include("${CMAKE_CURRENT_LIST_DIR}/my_helper_function_02.cmake")
|
|
include("${CMAKE_CURRENT_LIST_DIR}/my_helper_function_03.cmake")
|
|
```
|