rename CCACHE_PATH to CCACHE_DIR

https://ccache.dev/manual/3.7.11.html#_configuration uses CCACHE_DIR to set
cache directory. CCACHE_PATH has a different meaning.

+ removed LLVM_CCACHE_DIR ccache argument to use CCACHE_DIR from env.
+ print additional info about ccache config and machine readable stats.

containers/agent-debian-testing-buildkite/Dockerfile

@@ -40,7 +40,8 @@ RUN groupadd -g ${gid} ${group} ;\
 RUN chown -R ${user}:${user} /home/${user}
 
 WORKDIR /home/${user}
-ENV CCACHE_PATH=/mnt/disks/ssd0/ccache
+ENV CCACHE_DIR=/mnt/disks/ssd0/ccache
+ENV CCACHE_MAXSIZE=20G
 
 # configure locale
 RUN sed --in-place '/en_US.UTF-8/s/^#//' /etc/locale.gen ;\

containers/agent-debian-testing-buildkite/start_agent.sh

@@ -22,8 +22,8 @@ mkdir -p "${AGENT_ROOT}"
 chown -R ${USER}:${USER} "${AGENT_ROOT}"
 
 # prepare folder for ccache
-mkdir -p "${CCACHE_PATH}"
-chown -R ${USER}:${USER} "${CCACHE_PATH}"
+mkdir -p "${CCACHE_DIR}"
+chown -R ${USER}:${USER} "${CCACHE_DIR}"
 
 # TODO(kuhnel): wipe the disk(s) on startup
 

containers/agent-debian-testing-ssd/Dockerfile

@@ -46,7 +46,8 @@ RUN groupadd -g ${gid} ${group} ;\
 RUN chown -R ${user}:${user} /home/${user}
 
 WORKDIR /home/${user}
-ENV CCACHE_PATH=/mnt/disks/ssd0/ccache
+ENV CCACHE_DIR=/mnt/disks/ssd0/ccache
+ENV CCACHE_MAXSIZE=20G
 
 # configure locale
 RUN sed --in-place '/en_US.UTF-8/s/^#//' /etc/locale.gen ;\

containers/agent-debian-testing-ssd/start_agent.sh

@@ -26,8 +26,8 @@ mkdir -p "${AGENT_ROOT}"
 chown -R jenkins:jenkins "${AGENT_ROOT}"
 
 # prepare folder for ccache
-mkdir -p "${CCACHE_PATH}"
-chown -R jenkins:jenkins "${CCACHE_PATH}"
+mkdir -p "${CCACHE_DIR}"
+chown -R jenkins:jenkins "${CCACHE_DIR}"
 
 # copy ssh keys to user jenkins
 mkdir -p ${SSH_KEY_TARGET}

containers/buildkite-premerge-debian/start_agent.sh

@@ -20,9 +20,10 @@ USER=buildkite-agent
 mkdir -p "${BUILDKITE_BUILD_PATH}"
 chown -R ${USER}:${USER} "${BUILDKITE_BUILD_PATH}"
 
-export CCACHE_PATH="${BUILDKITE_BUILD_PATH}"/ccache
-mkdir -p "${CCACHE_PATH}"
-chown -R ${USER}:${USER} "${CCACHE_PATH}"
+export CCACHE_DIR="${BUILDKITE_BUILD_PATH}"/ccache
+export CCACHE_MAXSIZE=20G
+mkdir -p "${CCACHE_DIR}"
+chown -R ${USER}:${USER} "${CCACHE_DIR}"
 
 # /mnt/ssh should contain known_hosts, id_rsa and id_rsa.pub .
 mkdir -p /var/lib/buildkite-agent/.ssh

scripts/buildkite/build_branch_pipeline.py

@@ -37,6 +37,7 @@ if __name__ == '__main__':
             'set -euo pipefail',
             'ccache --clear' if no_cache else '',
             'ccache --zero-stats',
+            'ccache --show-config',
             'mkdir -p artifacts',
             'dpkg -l >> artifacts/packages.txt',
             'export SRC=${BUILDKITE_BUILD_PATH}/llvm-premerge-checks',
@@ -55,6 +56,7 @@ if __name__ == '__main__':
             f'--projects="{projects}" --log-level={log_level} {filter_output}',
             'EXIT_STATUS=\\$?',
             'echo "--- ccache stats"',
+            'ccache --print-stats',
             'ccache --show-stats',
             'exit \\$EXIT_STATUS',
         ],

scripts/buildkite/build_master_pipeline.py

@@ -37,6 +37,7 @@ if __name__ == '__main__':
             'set -euo pipefail',
             'ccache --clear' if no_cache else '',
             'ccache --zero-stats',
+            'ccache --show-config',
             'mkdir -p artifacts',
             'dpkg -l >> artifacts/packages.txt',
             'export SRC=${BUILDKITE_BUILD_PATH}/llvm-premerge-checks',
@@ -49,6 +50,7 @@ if __name__ == '__main__':
             f'${{SRC}}/scripts/premerge_checks.py --projects="{projects}" --log-level={log_level} {filter_output}',
             'EXIT_STATUS=\\$?',
             'echo "--- ccache stats"',
+            'ccache --print-stats',
             'ccache --show-stats',
             'exit \\$EXIT_STATUS',
         ],

scripts/run_cmake.py

@@ -123,12 +123,10 @@ def _create_args(config: Configuration, llvm_enable_projects: str, use_cache: bo
                 '-DCMAKE_CXX_COMPILER_LAUNCHER=sccache',
             ])
         # enable ccache if the path is set in the environment
-        elif 'CCACHE_PATH' in os.environ:
+        elif 'CCACHE_DIR' in os.environ:
             logging.info("using ccache")
             arguments.extend([
                 '-D LLVM_CCACHE_BUILD=ON',
-                '-D LLVM_CCACHE_DIR={}'.format(os.environ['CCACHE_PATH']),
-                '-D LLVM_CCACHE_MAXSIZE=20G',
             ])
     return arguments
 

scripts/run_cmake.sh

@@ -15,7 +15,7 @@
 set -eux
 
 # Runs Cmake.
-# Inputs: CCACHE_PATH, WORKSPACE, TARGET_DIR; $WORKSPACE/build must exist.
+# Inputs: CCACHE_DIR, WORKSPACE, TARGET_DIR; $WORKSPACE/build must exist.
 # Outputs: $TARGET_DIR/CMakeCache.txt, $WORKSPACE/compile_commands.json (symlink).
 
 echo "Running CMake... ======================================"
@@ -27,7 +27,7 @@ cd "$WORKSPACE"/build
 set +e
 cmake -GNinja ../llvm -DCMAKE_BUILD_TYPE=Release -D LLVM_ENABLE_LLD=ON \
     -D LLVM_ENABLE_PROJECTS="clang;clang-tools-extra;libc;libcxx;libcxxabi;lld;libunwind;mlir;flang" \
-    -D LLVM_CCACHE_BUILD=ON -D LLVM_CCACHE_DIR="${CCACHE_PATH}" -D LLVM_CCACHE_MAXSIZE=20G \
+    -D LLVM_CCACHE_BUILD=ON -D LLVM_CCACHE_DIR="${CCACHE_DIR}" -D LLVM_CCACHE_MAXSIZE=20G \
     -D LLVM_ENABLE_ASSERTIONS=ON -DCMAKE_CXX_FLAGS=-gmlt \
     -DLLVM_LIT_ARGS="-v --xunit-xml-output ${WORKSPACE}/build/test-results.xml"
 RETURN_CODE="${PIPESTATUS[0]}"

scripts/run_cmake_config.yaml

@@ -24,7 +24,7 @@ arguments:
     - '-D LLVM_BUILD_EXAMPLES=ON'
     - '-D LLVM_LIT_ARGS="-v --xunit-xml-output test-results.xml"'
   linux:
-    # CCACHE is enabled in script iff environment variable `CCACHE_PATH` is set
+    # CCACHE is enabled in script iff environment variable `CCACHE_DIR` is set
     - '-D LLVM_ENABLE_LLD=ON'
     - '-D CMAKE_CXX_FLAGS=-gmlt'
   windows: []