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CMake: Add background and future plans to README (#13589)

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Hugues Kamba 2020-09-14 16:04:25 +01:00 committed by Hugues Kamba
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cmake/README.md
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## CMake for Mbed OS
Until further notice, CMake for Mbed OS is still in development.
In order to [replace the traditional Mbed tools](https://os.mbed.com/blog/entry/Introducing-the-new-Mbed-Tools/), we are adding CMake support to allow the generation of build systems instructions to build Mbed OS as a library.
This is still at the experimental stage and still in development. It does not yet completely replace our current build tools. If you find a bug, please report it or raise a pull request as contributions are welcome!
Mbed OS is built as collection of all libraries supported by a given Mbed target. Application project executables can be linked with the monolithic `mbed-os` library to build Mbed applications.
We are currently working to break down the `mbed-os` library into several individual libraries that applications can selectively choose to include depending on their needs.
The following features are not yet supported and will be progressively added:
* Application profile selection (`bare metal`)
* C library selection (`small`)
* `s/f/v/printf` library selection (`minimal-printf`)
* Other features that require altering compiler/linker command line options
Application profile selection (`bare metal` or `full`), printf library selection (`minimal-printf` or `std`), C library selection (`small` or `std`) and other features that require altering compiler/linker command line options are not yet supported.
The full profile with the standard printf and C library are selected by default.
### Supported targets
Only a limited set of targets is supported at the moment.
These targets should work:
- K64F
The following targets are supported:
- DISCO_L475VG_IOT01A
- K64F
- K66F
- NRF52840_DK
- WIO_3G
- K66F
### Supported toolchains
@ -22,7 +33,7 @@ Arm Compiler 6 and GNU Arm Embedded toolchains are supported.
### Examples
Supported examples can be identified by the presence of a top level `CMakelists.txt` input source file.
Supported examples can be identified by the presence of a top level `CMakelists.txt` input source file.
### Known issues