Ubuntu - How to enable ccache on cicd

PiotrCiosmak
November 2, 2023
254 views
1 vote
2 Answers

I’m trying to enable ccache on gitlab cicd. I want to aciviate the ccache shared between all branches

I added this code to the dockerfile:

RUN apt update -y && apt upgrade -y && apt install -y ccache
ENV CCACHE_CPP2=yes
ENV CCACHE_DIR=/PROJECT-NAME/ccache
RUN export PATH="/usr/lib/ccache:$PATH"

I changed code in the .gitlab-ci.yml:

test:
  image: ......../runner_x86:9.0.6
  stage: test
  tags:
    - docker-gpu
  cache:
    key: shared-cache
    paths:
      - /ccache/
    policy: pull-push
  script:
    - export CCACHE_DEBUG=1
    
    - ccache -s
    - ls -l
    - du -sh ccache || true
    - ls ccache || true
    - cat ccache/ccache.conf || true
    - bash scripts/unit_test.sh -D CMAKE_CUDA_COMPILER=$(which nvcc) -D ENABLE_BENCHMARK=OFF
    - ccache --show-config
  except:
    - master
  coverage: !reference [ .gitlab-coverage-badge ]
  artifacts:
    reports:
      coverage_report:
        coverage_format: cobertura
        path: docker_build_debug/coverage.xml
    when: always
    untracked: false
    expire_in: 3 days

I add this code to main CMakeLists.txt:

find_program(CCACHE "ccache")
if(CCACHE)
    set(CMAKE_CXX_COMPILER_LAUNCHER ccache)
endif ()

The ccache folder creates and has some data, but build time is not reducing

JOB:

Running with gitlab-runner 15.10.1 (dcfb4b66)
  on runner on ***** with docker-gpu on ubuntu hzdz5qmn, system ID: xxxxx
Preparing the "docker" executor
Using Docker executor with image ........./runner_x86:9.0.0 ...
Authenticating with credentials from job payload (GitLab Registry)
Pulling docker image ................./runner_x86:9.0.0 ...
Using docker image sha256:xxxx for ......../runner_x86:9.0.0 with digest ............../runner_x86@sha256:xxxxx ...
Preparing environment 00:04
Running on runner-hzdz5qmn-project-77-concurrent-0 via RUNNER...
Getting source from Git repository 00:02
Fetching changes with git depth set to 20...
Reinitialized existing Git repository in ......./PROJECT-NAME/.git/
Checking out a9089fc0 as detached HEAD (ref is feature/working_ccache)...
Removing 1
Removing UnityMockDataset.zip
Removing datasets/
Removing docker_build_debug/
Removing models/
Removing parseq.zip
Removing PROJECT-NAME/
Removing test_data/merging/img-this-output.bmp
Removing test_data/merging/merged-dataset-frames.bmp
Removing yolox.zip
Skipping Git submodules setup
Restoring cache 00:04
Checking cache for shared-cache-1-non_protected...
cache.zip is up to date                            
Successfully extracted cache

…

$ export CCACHE_DEBUG=1
$ ccache -s
cache directory                     /PROJECT-NAME/ccache
primary config                      /PROJECT-NAME/ccache/ccache.conf
secondary config      (readonly)    /etc/ccache.conf
cache hit (direct)                     0
cache hit (preprocessed)               0
cache miss                             0
cache hit rate                      0.00 %
cleanups performed                     0
files in cache                         0
cache size                           0.0 kB
max cache size                       5.0 GB
$ ls -l
total 52
-rw-rw-rw-  1 root root 2822 Oct 31 11:12 CMakeLists.txt
-rw-rw-rw-  1 root root 1372 Aug  2 10:26 README.md
drwxrwxrwx  2 root root 4096 Oct 31 11:12 apps
drwxr-xr-x 19 root root 4096 Oct 23 14:11 ccache
drwxrwxrwx  3 root root 4096 Oct 25 16:06 cmake
-rw-rw-rw-  1 root root  812 Oct 27 14:36 conanfile.txt
drwxrwxrwx  6 root root 4096 Oct 28 17:05 configs
drwxrwxrwx  4 root root 4096 Oct 31 11:12 docker
drwxrwxrwx  3 root root 4096 Aug  2 10:26 include
drwxrwxrwx  4 root root 4096 Oct 31 11:12 scripts
drwxrwxrwx 13 root root 4096 Oct 31 11:12 src
drwxrwxrwx  6 root root 4096 Oct 25 16:06 test_data
drwxrwxrwx  6 root root 4096 Oct 30 12:55 tests
$ du -sh ccache || true
741M    ccache
$ ls ccache || true
0
1
2
3
4
5
6
7
8
9
a
b
c
ccache.conf
d
e
f
tmp
$ cat ccache/ccache.conf || true
max_size = 5.0G
$ bash scripts/unit_test.sh -D CMAKE_CUDA_COMPILER=$(which nvcc) -D ENABLE_BENCHMARK=OFF
+ trap cleanup EXIT
+ id
uid=0(root) gid=0(root) groups=0(root)
+ cmake --version
cmake version 3.27.6
CMake suite maintained and supported by Kitware (kitware.com/cmake).
+ gcc --version
gcc (Ubuntu 11.4.0-2ubuntu1~20.04) 11.4.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ nvcc --version
nvcc: NVIDIA (R) Cuda compiler driver
Copyright (c) 2005-2023 NVIDIA Corporation
Built on Tue_Feb__7_19:32:13_PST_2023
Cuda compilation tools, release 12.1, V12.1.66
Build cuda_12.1.r12.1/compiler.32415258_0
+ env
+ grep CXX
+ true
+ export CONAN_USER_HOME=/builds/DEV/PROJECT-NAME/PROJECT-NAME/
+ CONAN_USER_HOME=/builds/DEV/PROJECT-NAME/PROJECT-NAME/
+ source ./scripts/setup/ci_download_dependencies.sh
++ export_variables
++ '[' -z [MASKED] ']'
++ JOB_TOKEN=[MASKED]
++ GITLAB_URL=https://xxxxx/api/v4
++ PROJECT_ID=103
+++ python3 scripts/utils/get_gpu.py
++ export GPU=NVIDIA-GeForce-RTX-3090
++ GPU=NVIDIA-GeForce-RTX-3090
++ '[' '!' -z [MASKED] ']'
++ AUTH_HEADER='JOB-TOKEN: [MASKED]'
++ download_dataset
++ '[' '!' -d datasets/UnityMockDataset ']'
++ echo 'Downloading UnityMockDataset ...'
++ mkdir -p datasets/UnityMockDataset
Downloading UnityMockDataset ...

.. BUILD A FEW MINUTES (THE SAME TIME WITHOUT CCACHE) for example:

[ 75%] Built target camera_viewer
[ 76%] Building CXX object tests/unit/CMakeFiles/test_PROJECT_NAME.dir/plate_recognition/ImageCropperTest.cpp.o
cd /builds/DEV/PROJECT-NAME/docker_build_debug/tests/unit && ccache /usr/bin/c++ -DJPEG_FOUND -DPNG_FOUND -DUSE_C10D_GLOO -DUSE_C10D_MPI -DUSE_C10D_NCCL -DUSE_DISTRIBUTED -DUSE_RPC -DUSE_TENSORPIPE -DWITH_CUDA -I/builds/DEV/PROJECT-NAME/tests/unit/test_util -I/builds/DEV/PROJECT-NAME/src/../include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/range-v3/0.12.0/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/nanobench/4.3.11/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/commons/0.1/develop/1c4e1906/package/fdfc1f616204390f0c0bb480a1786a53d2bb439e/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/taskflow/3.6.0/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/mio/cci.20230303/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/gtest/1.12.1/_/_/package/e54178ffb73389748e7bf45e64441da62db44ded/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/mp-units/0.8.0/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/boost/1.76.0/_/_/package/e2f1ab856c267df5e6bffc45064137eb4200952e/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/di/1.2.0/_/_/package/964905e09401b68ee5f6b695b187d4fa9eb760c2/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/asio/1.24.0/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/magic_enum/0.8.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/tl-expected/1.1.0/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/eventpp/0.1/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/mavlink-cpp11/0.3/chimera+3rd_party_open_source+mavlink-cpp11-library/stable/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/TE/latest/boost/te/package/2a448472971d7718b4207a1ee198ae4f78f2995d/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/nlohmann_json/3.11.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/spdlog/1.11.0/_/_/package/8adac865734b8b9f6eacb065ed45c095ce372c5b/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/fixed_string/1.0/_/_/package/2a448472971d7718b4207a1ee198ae4f78f2995d/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/gsl-lite/0.40.0/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/fmt/9.1.0/_/_/package/20da98908a15523bbe9f086a5c57a4bde424a9c0/include -isystem /builds/DEV/PROJECT-NAME/tests/unit/../include -isystem /usr/include/opencv4 -isystem /opt/xxxx/embree/include -isystem /usr/include/eigen3 -isystem /usr/local/include/torchvision -isystem /opt/xxxxx/onnx-112/include -isystem /opt/xxxxx/OC_SORT/include -isystem /opt/xxxxxxxxxx/libtorch/include -isystem /opt/xxxx/libtorch/include/torch/csrc/api/include -isystem /usr/local/cuda/include -isystem /opt/pylon/include -g -fprofile-arcs -ftest-coverage   -g  -std=c++20 -DGSL_TERMINATE_ON_CONTRACT_VIOLATION -DSPDLOG_FMT_EXTERNAL -DSPDLOG_COMPILED_LIB -DASIO_STANDALONE -DBOOST_DI_CFG_DIAGNOSTICS_LEVEL=1 -D_GLIBCXX_USE_CXX11_ABI=1 -Werror -Wall -Wextra -Wshadow -Wnon-virtual-dtor -Wold-style-cast -Wcast-align -Wunused -Woverloaded-virtual -Wpedantic -Wconversion -Wsign-conversion -Wnull-dereference -Wdouble-promotion -Wformat=2 -Wmisleading-indentation -Wduplicated-cond -Wduplicated-branches -Wlogical-op -Wuseless-cast -Wno-psabi -MD -MT tests/unit/CMakeFiles/test_PROJECT_NAME.dir/plate_recognition/ImageCropperTest.cpp.o -MF CMakeFiles/test_PROJECT_NAME.dir/plate_recognition/ImageCropperTest.cpp.o.d -o CMakeFiles/test_PROJECT_NAME.dir/plate_recognition/ImageCropperTest.cpp.o -c /builds/DEV/PROJECT-NAME/tests/unit/plate_recognition/ImageCropperTest.cpp
[ 77%] Building CXX object tests/unit/CMakeFiles/test_PROJECT_NAME.dir/plate_recognition/ParseqONNXTest.cpp.o
cd /builds/DEV/PROJECT-NAME/docker_build_debug/tests/unit && ccache /usr/bin/c++ -DJPEG_FOUND -DPNG_FOUND -DUSE_C10D_GLOO -DUSE_C10D_MPI -DUSE_C10D_NCCL -DUSE_DISTRIBUTED -DUSE_RPC -DUSE_TENSORPIPE -DWITH_CUDA -I/builds/DEV/PROJECT-NAME/tests/unit/test_util -I/builds/DEV/PROJECT-NAME/src/../include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/range-v3/0.12.0/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/nanobench/4.3.11/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/commons/0.1/develop/1c4e1906/package/fdfc1f616204390f0c0bb480a1786a53d2bb439e/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/taskflow/3.6.0/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/mio/cci.20230303/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/gtest/1.12.1/_/_/package/e54178ffb73389748e7bf45e64441da62db44ded/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/mp-units/0.8.0/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/boost/1.76.0/_/_/package/e2f1ab856c267df5e6bffc45064137eb4200952e/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/di/1.2.0/_/_/package/964905e09401b68ee5f6b695b187d4fa9eb760c2/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/asio/1.24.0/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/magic_enum/0.8.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/tl-expected/1.1.0/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/eventpp/0.1/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/mavlink-cpp11/0.3/chimera+3rd_party_open_source+mavlink-cpp11-library/stable/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/TE/latest/boost/te/package/2a448472971d7718b4207a1ee198ae4f78f2995d/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/nlohmann_json/3.11.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/spdlog/1.11.0/_/_/package/8adac865734b8b9f6eacb065ed45c095ce372c5b/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/fixed_string/1.0/_/_/package/2a448472971d7718b4207a1ee198ae4f78f2995d/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/gsl-lite/0.40.0/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include -isystem /builds/DEV/PROJECT-NAME/PROJECT-NAME/.conan/data/fmt/9.1.0/_/_/package/20da98908a15523bbe9f086a5c57a4bde424a9c0/include -isystem /builds/DEV/PROJECT-NAME/tests/unit/../include -isystem /usr/include/opencv4 -isystem /opt/xxx/embree/include -isystem /usr/include/eigen3 -isystem /usr/local/include/torchvision -isystem /opt/xxx/onnx-112/include -isystem /opt/xxxx/OC_SORT/include -isystem /opt/xxxx/libtorch/include -isystem /opt/xxxxx/libtorch/include/torch/csrc/api/include -isystem /usr/local/cuda/include -isystem /opt/pylon/include -g -fprofile-arcs -ftest-coverage   -g  -std=c++20 -DGSL_TERMINATE_ON_CONTRACT_VIOLATION -DSPDLOG_FMT_EXTERNAL -DSPDLOG_COMPILED_LIB -DASIO_STANDALONE -DBOOST_DI_CFG_DIAGNOSTICS_LEVEL=1 -D_GLIBCXX_USE_CXX11_ABI=1 -Werror -Wall -Wextra -Wshadow -Wnon-virtual-dtor -Wold-style-cast -Wcast-align -Wunused -Woverloaded-virtual -Wpedantic -Wconversion -Wsign-conversion -Wnull-dereference -Wdouble-promotion -Wformat=2 -Wmisleading-indentation -Wduplicated-cond -Wduplicated-branches -Wlogical-op -Wuseless-cast -Wno-psabi -MD -MT tests/unit/CMakeFiles/test_PROJECT_NAME.dir/plate_recognition/ParseqONNXTest.cpp.o -MF CMakeFiles/test_PROJECT_NAME.dir/plate_recognition/ParseqONNXTest.cpp.o.d -o CMakeFiles/test_PROJECT_NAME.dir/plate_recognition/ParseqONNXTest.cpp.o -c /builds/DEV/PROJECT-NAME/tests/unit/plate_recognition/ParseqONNXTest.cpp

THE END

Uploading package 1/1: xxxxx to 'yyyy-conan'       
Package is up to date, upload skipped
+ cleanup
++ stat -c %u:%g PROJECT-NAME
+ chown -R 0:0 docker_build_debug
$ ccache --show-config
(default) base_dir = 
(environment) cache_dir = /PROJECT-NAME/ccache
(default) cache_dir_levels = 2
(default) compiler = 
(default) compiler_check = mtime
(default) compression = false
(default) compression_level = 6
(default) cpp_extension = 
(environment) debug = true
(default) depend_mode = false
(default) direct_mode = true
(default) disable = false
(default) extra_files_to_hash = 
(default) hard_link = false
(default) hash_dir = true
(default) ignore_headers_in_manifest = 
(default) keep_comments_cpp = false
(default) limit_multiple = 0.8
(default) log_file = 
(default) max_files = 0
(/PROJECT-NAME/ccache/ccache.conf) max_size = 5.0G
(default) path = 
(default) pch_external_checksum = false
(default) prefix_command = 
(default) prefix_command_cpp = 
(default) read_only = false
(default) read_only_direct = false
(default) recache = false
(environment) run_second_cpp = true
(default) sloppiness = 
(default) stats = true
(default) temporary_dir = 
(default) umask = 
Saving cache for successful job 00:00
Creating cache shared-cache-1-non_protected...
WARNING: processPath: artifact path is not a subpath of project directory: /ccache/ 
Archive is up to date!                             
Created cache
Uploading artifacts for successful job 00:01
Uploading artifacts...
docker_build_debug/coverage.xml: found 1 matching artifact files and directories 
Uploading artifacts as "cobertura" to coordinator... 201 Created  id=xxx responseStatus=201 Created token=xxxx
Cleaning up project directory and file based variables 00:00
Job succeeded
Job succeeded

Tags: c#caching ccache cicd gitlab

Answers

Chosen as BEST ANSWER

@Darius

I'm using ccache version 3.7.7 Here is ccache --show-stats -v result:

 ccache --show-stats -v
cache directory                     /PROJECT-NAME/ccache
primary config                      /PROJECT-NAME/ccache/ccache.conf
secondary config      (readonly)    /etc/ccache.conf
cache hit (direct)                     0
cache hit (preprocessed)               0
cache miss                             0
cache hit rate                      0.00 %
cleanups performed                     0
files in cache                         0
cache size                           0.0 kB
max cache size                       5.0 GB
ccache: invalid option -- 'v'
Usage:
    ccache [options]
    ccache compiler [compiler options]
    compiler [compiler options]          (via symbolic link)
Common 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
    -p, --show-config         show current configuration options in
                              human-readable format
    -s, --show-stats          show summary of configuration and statistics
                              counters in human-readable format
    -z, --zero-stats          zero statistics counters
    -h, --help                print this help text
    -V, --version             print version and copyright information
Options for scripting or debugging:
        --dump-manifest=PATH  dump manifest file at PATH in text format
    -k, --get-config=K        print the value of configuration key K
        --hash-file=PATH      print the hash (<MD4>-<size>) of the file at PATH
        --print-stats         print statistics counter IDs and corresponding
                              values in machine-parsable format
    -o, --set-config=K=V      set configuration item K to value V
See also <https://ccache.dev>.

Here is ccache --show-stats -V result:

$ ccache --show-stats -V
cache directory                     /PROJECT-NAME/ccache
primary config                      /PROJECT-NAME/ccache/ccache.conf
secondary config      (readonly)    /etc/ccache.conf
cache hit (direct)                     0
cache hit (preprocessed)               0
cache miss                             0
cache hit rate                      0.00 %
cleanups performed                     0
files in cache                         0
cache size                           0.0 kB
max cache size                       5.0 GB
ccache version 3.7.7
Copyright (C) 2002-2007 Andrew Tridgell
Copyright (C) 2009-2020 Joel Rosdahl
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation;

@Botej

I removed last line in Dockerfile, thanks I fix the mismatch between CCACHE_DIR=/PROJECT-NAME/ccache and /ccache.

  cache:
    key: shared-cache
    paths:
      - ccache/
    policy: pull-push

but it's still not working

(Edit)

- Darius
- November 2, 2023 at 10:33 am
- 0 votes
0
You need a newer version of ccache, preferably 4.5+.

https://github.com/rapidsai/raft/pull/729 explains that fixes have been backported to ccache 3.7.9+, which is above what you use (3.7.7).

https://github.com/ccache/ccache/issues/772#issuecomment-760462748 details cuda and cu support in ccache:
jrosdahl: This rings a bell. It’s quite complicated and I’m not sure I
fully remember the details. Let’s see:
- b2d6d53 (ccache 3.3) added support for language cuda. a5e5b6d (ccache 3.7.9), part of Improve CMake+CUDA compatibility: add "cu"
  language, recognize -dc as compilation only argument #381, added
  support for language cu.
- c4fffda (ccache 3.7.9), which I added to Improve CMake+CUDA compatibility: add "cu" language, recognize -dc as compilation only
  argument #381, removed support for language cuda since NVCC doesn’t
  understand cuda.
- 95b0dc5 (ccache 4.0) re-added support for cuda since "Clang apparently recognizes it". Related comment: Improve CMake+CUDA
  compatibility: add "cu" language, recognize -dc as compilation only
  argument #381 (comment).
- 2728c68 (ccache 4.0) reverted the above commit, saying ‘NVCC maps the “.cu” extension to “cu” but Clang maps it to “cuda”, so it’s
  ambiguous. Let’s ignore the Clang case for now.’ Related comment:
  Improve CMake+CUDA compatibility: add "cu" language, recognize -dc as
  compilation only argument #381 (comment).
Note that there are still some issues with cuda support but this should get you somewhere.
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Ubuntu – How to enable ccache on cicd

Answers