opencv[cuda] fails when FEATURES includes ccache. It succeeded with FEATURES=-ccache. -- Generating dependency file: /tmp/portage/media-libs/opencv-3.1.0-r7/work/opencv-3.1.0_build/modules/core/CMakeFiles/cuda_compile.dir/src/cuda/cuda_compile_generated_gpu_mat.cu.o.NVCC-depend /opt/cuda/bin/nvcc -M -D__CUDACC__ /tmp/portage/media-libs/opencv-3.1.0-r7/work/opencv-3.1.0/modules/core/src/cuda/gpu_mat.cu -o /tmp/portage/media-libs/opencv-3.1.0-r7/work/opencv-3.1.0_build/modul es/core/CMakeFiles/cuda_compile.dir/src/cuda/cuda_compile_generated_gpu_mat.cu.o.NVCC-depend -ccbin /usr/bin/ccache -m64 -D__OPENCV_BUILD=1 -Xcompiler ,\"-O2\",\"-pipe\",\"-msse\",\"-msse2\",\"-msse 3\",\"-mmmx\",\"-mpopcnt\",\"-mcx16\",\"-mfxsr\",\"-msahf\",\"-fsigned-char\",\"-W\",\"-Wall\",\"-Werror=return-type\",\"-Werror=non-virtual-dtor\",\"-Werror=address\",\"-Werror=sequence-point\",\"- Wformat\",\"-Werror=format-security\",\"-Wmissing-declarations\",\"-Winit-self\",\"-Wpointer-arith\",\"-Wno-narrowing\",\"-fdiagnostics-show-option\",\"-Wno-long-long\",\"-pthread\",\"-fomit-frame-p ointer\",\"-msse\",\"-msse2\",\"-mno-avx\",\"-msse3\",\"-mno-ssse3\",\"-mno-sse4.1\",\"-mno-sse4.2\",\"-ffunction-sections\",\"-fvisibility=hidden\",\"-fopenmp\",\"-Wno-undef\",\"-Wno-enum-compare\" ,\"-Wno-unused-function\",\"-Wno-shadow\",\"-Wno-unused-but-set-variable\" -gencode arch=compute_20,code=sm_20 -gencode arch=compute_20,code=sm_21 -gencode arch=compute_30,code=sm_30 -gencode arch=c ompute_35,code=sm_35 -gencode arch=compute_30,code=compute_30 -Xcompiler -DCVAPI_EXPORTS -Xcompiler -fPIC -DNVCC -I/opt/cuda/include -I/tmp/portage/media-libs/opencv-3.1.0-r7/work/opencv-3.1.0_build -I/usr/include/eigen3 -I/tmp/portage/media-libs/opencv-3.1.0-r7/work/opencv-3.1.0/modules/core/include -I/tmp/portage/media-libs/opencv-3.1.0-r7/work/opencv-3.1.0/modules/core/src -I/tmp/portage/media-libs/opencv-3.1.0-r7/work/opencv-3.1.0_build/modules/core -I/tmp/portage/media-libs/opencv-3.1.0-r7/work/opencv-3.1.0/modules/cudev/include -I/usr/include -I/opt/cuda/include nvcc warning : The 'compute_20', 'sm_20', and 'sm_21' architectures are deprecated, and may be removed in a future release (Use -Wno-deprecated-gpu-targets to suppress warning). /usr/bin/ccache: invalid option -- 'E' Usage: ccache [options] ccache compiler [compiler options] compiler [compiler options] (via symbolic link) Options: -c, --cleanup delete old files and recalculate size counters (normally not needed as this is done automatically) -C, --clear clear the cache completely (except configuration) -F, --max-files=N set maximum number of files in cache to N (use 0 for no limit) -M, --max-size=SIZE set maximum size of cache to SIZE (use 0 for no limit); available suffixes: k, M, G, T (decimal) and Ki, Mi, Gi, Ti (binary); default suffix: G -o, --set-config=K=V set configuration key K to value V -p, --print-config print current configuration options -s, --show-stats show statistics summary -z, --zero-stats zero statistics counters -h, --help print this help text -V, --version print version and copyright information See also <https://ccache.samba.org>. CMake Error at cuda_compile_generated_gpu_mat.cu.o.cmake:208 (message): Error generating /tmp/portage/media-libs/opencv-3.1.0-r7/work/opencv-3.1.0_build/modules/core/CMakeFiles/cuda_compile.dir/src/cuda/./cuda_compile_generated_gpu_mat.cu.o make[2]: *** [modules/core/CMakeFiles/opencv_core.dir/build.make:65: modules/core/CMakeFiles/cuda_compile.dir/src/cuda/cuda_compile_generated_gpu_mat.cu.o] Error 1 Reproducible: Always
This looks like something to do with CUDA. Does it work if you compile without it? If so, then the only thing that can be done is to restrict cache use. Not much we can do about it then.
Please use FEATURES=-ccache. If you want us to do something about it please provide full build.log and emerge --info and reopen bug. Thank you
