# How to use all cross configs for custom targets ?
**URL:** https://discourse.cmake.org/t/how-to-use-all-cross-configs-for-custom-targets/7908
**Category:** Usage
**Created:** [April 14, 2023, 5:36pm UTC](https://discourse.cmake.org/t/how-to-use-all-cross-configs-for-custom-targets/7908 "2023-04-14T17:36:50Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@abdelmaged](https://discourse.cmake.org/u/abdelmaged)
#### Post date: [April 14, 2023, 5:36pm UTC](https://discourse.cmake.org/t/how-to-use-all-cross-configs-for-custom-targets/7908/1 "2023-04-14T17:36:50Z")
I’m trying to use Ninja Multi-Config, and setting CMAKE\_CROSS\_CONFIGS to all, so that I can build all configuration at once with command line “cmake --build build -t world:all”
Where world is a custom targets, and just an alias for some other executables and shared libraries.
However, when passing world:all, it says unknown target.
Is there a way to build custom targets for all configs ?
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### Author:  [@benthevining](https://discourse.cmake.org/u/benthevining)
#### Post date: [April 14, 2023, 7:49pm UTC](https://discourse.cmake.org/t/how-to-use-all-cross-configs-for-custom-targets/7908/2 "2023-04-14T19:49:24Z")
When calling `cmke --build`, you have to use the target names known to CMake. `world:all` is indeed not a known target to cmake, that syntax is only understood by ninja itself. To specify a configuration, you would do something like `cmake --build build --target world --config all`. I’d recommend calling `ninja` directly or passing ninja-specific arguments to `cmake --build` after a `-` .
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### Author:  [@abdelmaged](https://discourse.cmake.org/u/abdelmaged)
#### Post date: [April 14, 2023, 10:49pm UTC](https://discourse.cmake.org/t/how-to-use-all-cross-configs-for-custom-targets/7908/3 "2023-04-14T22:49:58Z")
If the target is executable or library, cmake understands the syntax as well i.e.: `cmake --build build --target myexe:all` will build all configurations (Debug, Release, …), but if the target is custom, it seems that it does not exists.
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### Author:  [@abdelmaged](https://discourse.cmake.org/u/abdelmaged)
#### Post date: [May 5, 2023, 12:17am UTC](https://discourse.cmake.org/t/how-to-use-all-cross-configs-for-custom-targets/7908/4 "2023-05-05T00:17:05Z")
CC: @ben.boeckel
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### Author:  [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [May 5, 2023, 12:27pm UTC](https://discourse.cmake.org/t/how-to-use-all-cross-configs-for-custom-targets/7908/5 "2023-05-05T12:27:39Z")
I’m not all that familiar with this part of NMC. @kyle.edwards?