It seems that ”ccache“ doesn't work with CMAKE_TOOLCHAIN_FILE “emscripten.cmake”

[DOOOBETTER]

Hello all,
when I was trying to add "ccache" to my cmake program, no new files were added to my ccache directory. But I tried test "ccache em++/emcc" in a small project, it does work.

cmake -B build_wasm -S . -DCMAKE_TOOLCHAIN_FILE=/emsdk/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -DCMAKE_BUILD_TYPE=MinSizeRel -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
I use this way to apply ccache to my cmake file.

[sbc100]

Then you run the build do you see ccache being used in the build steps? i.e. if you do a clean build and then build with make VERBOSE=1 do you see ccache at the start of each compile step?

It looks like ccache has a bunch of different verbosity options you can try which might help you figure out what is going on?

[DOOOBETTER]

Thank you @sbc100 , I tried several ways to fix my problem and found that adding " export CCACHE_COMPILER_TYPE=emcc" to my script file can work out

[sbc100]

Strange.. I can't find any reference to CCACHE_COMPILER_TYPE anywhere. What do you think it does? Is ccache reading it? I don't see any mention of it in the ccache man page.

[DOOOBETTER]

Strange.. I can't find any reference to CCACHE_COMPILER_TYPE anywhere. What do you think it does? Is ccache reading it? I don't see any mention of it in the ccache man page.

sorry, I made a mistake. The real reason why my "ccache" doesn't work is that I didn't use an absolute path to set the "CCACHE_DIR".