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zephyr/cmake/makefile_exports
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Torsten Rasmussen a5917f0af4 cmake: export build flags to external build systems excluding SHELL tag 
Fixes: #28230

The introduction of CMake SHELL prefix in compile options to avoid
symbol de-duplication caused the build flag export feature to fail.

The export itself works, but unfortunately CMake only strips `SHELL`
prefix for its own compiler invocation, and not when exporting the build
flags.

This causes `SHELL` to be present in the Makefile.exports.<language>
files, leading to problems in external build systems.

This is fixed by using `zephyr_get_compile_options_for_lang()` that
strips `SHELL` and use the returned value for the export handling.

To ensure all compile options has been defined, then the inclusion of
`cmake/makefile_exports` has been moved to the end of
`zephyr/CMakeLists.txt` file.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
2020-09-10 11:31:53 +02:00
..
CMakeLists.txt