mirror of
https://github.com/microsoft/vcpkg.git
synced 2024-12-21 12:07:52 +08:00
0e1dc12185
* [rollup:2021-07-16 1/7] PR #18201 (@JackBoosY) [vcpkg-cmake] Add check for unused cmake variables * [rollup:2021-07-16 2/7] PR #18397 (@strega-nil) [vcpkg_list] add new function * [rollup:2021-07-16 3/7] PR #18782 (@strega-nil) [scripts-audit] vcpkg_build_ninja * [rollup:2021-07-16 4/7] PR #18784 (@strega-nil) [scripts-audit] vcpkg_minimum_required * [rollup:2021-07-16 5/7] PR #18785 (@strega-nil) [scripts-audit] vcpkg_replace_string * [rollup:2021-07-16 6/7] PR #18786 (@strega-nil) [scripts-audit] windows scripts * [rollup:2021-07-16 7/7] PR #18945 (@strega-nil) [many ports] remove deprecated vcpkg_check_features call [1/5] Co-authored-by: nicole mazzuca <mazzucan@outlook.com> Co-authored-by: PhoebeHui <20694052+PhoebeHui@users.noreply.github.com>
95 lines
2.5 KiB
Markdown
95 lines
2.5 KiB
Markdown
# vcpkg_list
|
|
|
|
The latest version of this document lives in the [vcpkg repo](https://github.com/Microsoft/vcpkg/blob/master/docs/maintainers/vcpkg_list.md).
|
|
|
|
A replacement for CMake's `list()` function, which correctly handles elements
|
|
with internal semicolons (in other words, escaped semicolons).
|
|
Use `vcpkg_list()` instead of `list()` whenever possible.
|
|
|
|
```cmake
|
|
vcpkg_list(SET <out-var> [<element>...])
|
|
vcpkg_list(<COMMAND> <list-var> [<other-arguments>...])
|
|
```
|
|
|
|
In addition to all of the commands from `list()`, `vcpkg_list` adds
|
|
a `vcpkg_list(SET)` command.
|
|
This command takes its arguments, escapes them, and then concatenates
|
|
them into a list; this should be used instead of `set()` for setting any
|
|
list variable.
|
|
|
|
Otherwise, the `vcpkg_list()` function is the same as the built-in
|
|
`list()` function, with the following restrictions:
|
|
|
|
- `GET`, `REMOVE_ITEM`, and `REMOVE_AT` support only one index/value
|
|
- `POP_BACK` and `POP_FRONT` do not support getting the value into
|
|
another out variable. Use C++ style `GET` then `POP_(BACK|FRONT)`.
|
|
- `FILTER` and `TRANSFORM` are unsupported.
|
|
|
|
See the [CMake documentation for `list()`](https://cmake.org/cmake/help/latest/command/list.html)
|
|
for more information.
|
|
|
|
## Notes: Some Weirdnesses
|
|
|
|
The most major weirdness is due to `""` pulling double-duty as "list of zero elements",
|
|
and "list of one element, which is empty". `vcpkg_list` always uses the former understanding.
|
|
This can cause weird behavior, for example:
|
|
|
|
```cmake
|
|
set(lst "")
|
|
vcpkg_list(APPEND lst "" "")
|
|
# lst = ";"
|
|
```
|
|
|
|
This is because you're appending two elements to the empty list.
|
|
One very weird behavior that comes out of this would be:
|
|
|
|
```cmake
|
|
set(lst "")
|
|
vcpkg_list(APPEND lst "")
|
|
# lst = ""
|
|
```
|
|
|
|
since `""` is the empty list, we append the empty element and end up with a list
|
|
of one element, which is empty. This does not happen for non-empty lists;
|
|
for example:
|
|
|
|
```cmake
|
|
set(lst "a")
|
|
vcpkg_list(APPEND lst "")
|
|
# lst = "a;"
|
|
```
|
|
|
|
only the empty list has this odd behavior.
|
|
|
|
## Examples
|
|
|
|
### Creating a list
|
|
|
|
```cmake
|
|
vcpkg_list(SET foo_param)
|
|
if(DEFINED arg_FOO)
|
|
vcpkg_list(SET foo_param FOO "${arg_FOO}")
|
|
endif()
|
|
```
|
|
|
|
### Appending to a list
|
|
|
|
```cmake
|
|
set(OPTIONS -DFOO=BAR)
|
|
if(VCPKG_TARGET_IS_WINDOWS)
|
|
vcpkg_list(APPEND OPTIONS "-DOS=WINDOWS;FOO")
|
|
endif()
|
|
```
|
|
|
|
### Popping the end off a list
|
|
|
|
```cmake
|
|
if(NOT list STREQUAL "")
|
|
vcpkg_list(GET list end -1)
|
|
vcpkg_list(POP_BACK list)
|
|
endif()
|
|
```
|
|
|
|
## Source
|
|
[scripts/cmake/vcpkg\_list.cmake](https://github.com/Microsoft/vcpkg/blob/master/scripts/cmake/vcpkg_list.cmake)
|