leezu opened a new pull request #17828: Update ccache on CI to fix cuda object caching URL: https://github.com/apache/incubator-mxnet/pull/17828 ## Description ## Update ccache on CI to make use of https://github.com/ccache/ccache/pull/381 > CMake always passes -x cu to NVCC. This is recognized by ccache as an explicit language setting, but the language "cu" is not understood by ccache. Thus ccache on CI currently does not attempt caching any cuda object files. To fix this, we install a fixed and tested pre-release version of ccache 4.
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