sorenfriis opened a new pull request, #17427:
URL: https://github.com/apache/nuttx/pull/17427
- Enable ccache in CMake if CONFIG_CCACHE is set
## Summary
Enable ccache support when building with CMake.
Currently the CONFIG_CCACHE setting is not used when building with CMake.
## Impact
If CONFIG_CCACHE is set and ccache is installed, ccache will be used as
compiler wrapper, which will speed up incremental and clean builds.
If CONFIG_CCACHE is set and ccache is **not** found, CMake will fail since
the REQUIRED keyword is used.
## Testing
Configure
```
> mkdir build && cd build
> cmake .. -DBOARD_CONFIG=sim:nsh -GNinja
> ninja menuconfig # <<< Enable CONFIG_CCACHE
```
Build with empty ccache
```
> ccache -C -z
> ninja clean
> ninja
> ccache -s
Cacheable calls: 1171 / 1173 (99.83%)
Hits: 0 / 1171 ( 0.00%)
Direct: 0
Preprocessed: 0
Misses: 1171 / 1171 (100.0%)
Uncacheable calls: 2 / 1173 ( 0.17%)
Local storage:
Cache size (GiB): 0.0 / 5.0 ( 0.26%)
Hits: 0 / 1171 ( 0.00%)
Misses: 1171 / 1171 (100.0%)
```
Build with populated ccache
```
> ccache -z
> ninja clean
> ninja
> ccache -s
Cacheable calls: 1171 / 1173 (99.83%)
Hits: 1170 / 1171 (99.91%)
Direct: 1170 / 1170 (100.0%)
Preprocessed: 0 / 1170 ( 0.00%)
Misses: 1 / 1171 ( 0.09%)
Uncacheable calls: 2 / 1173 ( 0.17%)
Local storage:
Cache size (GiB): 0.0 / 5.0 ( 0.26%)
Hits: 1170 / 1171 (99.91%)
Misses: 1 / 1171 ( 0.09%)
```
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