ccache is always invalidated

Hi,

I'm using cargo-zigbuild to build https://github.com/tikv/rust-rocksdb using this command:

cargo-zigbuild zigbuild --target x86_64-unknown-linux-gnu.2.17 --features="portable encryption"
make clean

It turns out that although rust-rocksdb/librocksdb-sys has configured ccache, the ccache is always invalidated, when command above is invoked multiple times.

pstree shows that ccache is called against this compiler: cargo-zigbuild/0.18.3/zigcxx-x86_64-unknown-linux-gnu.2.17.sh

 |   |   \-+= 25704 breezewish /Users/breezewish/Work/cargo-zigbuild/target/debug/cargo-zigbuild zigbuild --target x86_64-unknown-linux-gnu.2.17 --features=portable encryption
 |   |     \-+- 25808 breezewish /Users/breezewish/.rustup/toolchains/nightly-aarch64-apple-darwin/bin/cargo build --features portable encryption --target x86_64-unknown-linux-gnu
 |   |       \-+- 46938 breezewish /Users/breezewish/Work/rust-rocksdb/target/debug/build/librocksdb_sys-b7da2285123dc76e/build-script-build
 |   |         \-+- 47542 breezewish cmake --build . --target rocksdb --config Debug
 |   |           \-+- 47543 breezewish /opt/homebrew/Cellar/cmake/3.25.2/bin/cmake -E env VERBOSE=1 /usr/bin/make -f Makefile rocksdb
 |   |             \-+- 47544 breezewish /Library/Developer/CommandLineTools/usr/bin/make -f Makefile rocksdb
 |   |               \-+- 47546 breezewish /Library/Developer/CommandLineTools/usr/bin/make -f CMakeFiles/Makefile2 rocksdb
 |   |                 \-+- 47549 breezewish /Library/Developer/CommandLineTools/usr/bin/make -f CMakeFiles/Makefile2 CMakeFiles/rocksdb.dir/all
 |   |                   \-+- 47553 breezewish /Library/Developer/CommandLineTools/usr/bin/make -f CMakeFiles/rocksdb.dir/build.make CMakeFiles/rocksdb.dir/build
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 |   |                     |-+- 49323 breezewish ccache /Users/breezewish/Library/Caches/cargo-zigbuild/0.18.3/zigcxx-x86_64-unknown-linux-gnu.2.17.sh -DBZIP2 -DLZ4 -DOPENSSL -DOS_LINUX -DROCKSDB_FALLOCATE_PRESENT -DROCKSDB_LIB_IO_POSIX -DROCKSDB_MALLOC_USABLE_SIZE -DROCKSDB_NO_DYNAMIC_EXTENSION -DROCKSDB_PLATFORM_POSIX -DROCKSDB_PTHREAD_ADAPTIVE_MUTEX -DROCKSDB_RANGESYNC_PRESENT -DROCKSDB_SCHED_GETCPU_PRESENT -DROCKSDB_SUPPORT_THREAD_LOCAL -DSNAPPY -DZLIB -DZSTD -I/Users/breezewish/Work/rust-rocksdb/target/x86_64-unknown-linux-gnu/debug/build/bzip2-sys-044f7346d0d7b9f4/out/include -I/Users/breezewish/Work/rust-rocksdb/target/x86_64-unknown-linux-gnu/debug/build/openssl-sys-a3212a2121e8be6c/out/openssl-build/install/include -I/Users/breezewish/Work/rust-rocksdb/librocksdb_sys/rocksdb -I/Users/breezewish/Work/rust-rocksdb/librocksdb_sys/rocksdb/include -I/Users/breezewish/Work/rust-rocksdb/librocksdb_sys/rocksdb/third-party/folly -isystem /Users/breezewish/Work/rust-rocksdb/librocksdb_sys/rocksdb/third-party/gtest-1.8.1/fused-src -isystem /opt/homebrew/include -isystem /Users/breezewish/Work/rust-rocksdb/target/x86_64-unknown-linux-gnu/debug/build/libz-sys-f1896d79ba48e1a0/out/include -isystem /Users/breezewish/Work/rust-rocksdb/target/x86_64-unknown-linux-gnu/debug/build/lz4-sys-0987f25107261b62/out/include -isystem /Users/breezewish/Work/rust-rocksdb/target/x86_64-unknown-linux-gnu/debug/build/zstd-sys-f8a595396cfc5e95/out/include -ffunction-sections -fdata-sections -fPIC -m64 -W -Wextra -Wall -pthread -Wsign-compare -Wshadow -Wno-unused-parameter -Wno-unused-variable -Woverloaded-virtual -Wnon-virtual-dtor -Wno-missing-field-initializers -Wno-strict-aliasing -Werror -g -DROCKSDB_USE_RTTI -std=gnu++11 -MD -MT CMakeFiles/rocksdb.dir/db/external_sst_file_ingestion_job.cc.o -MF CMakeFiles/rocksdb.dir/db/external_sst_file_ingestion_job.cc.o.d -o CMakeFiles/rocksdb.dir/db/external_sst_file_ingestion_job.cc.o -c /Users/breezewish/Work/rust-rocksdb/librocksdb_sys/rocksdb/db/external_sst_file_ingestion_job.cc
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ccache debug log shows that this compiler proxy is re-generated every time, causing ccache fail to cache:

Build 1:

=== COMMON ===
4
### ext
ii
### cc_mtime
133
1712808022947302145
### cc_name
zigcxx-x86_64-unknown-linux-gnu.2.17.sh

Build 2:

=== COMMON ===
4
### ext
ii
### cc_mtime
133
1712805941641050774
### cc_name
zigcxx-x86_64-unknown-linux-gnu.2.17.sh

One way to workaround is to configure ccache to use compiler content to check:

ccache --set-config=compiler_check=content

This makes cache slower, and is not a default option for users.

Is it possible to improve this behavior? Thanks!

rust-cross / cargo-zigbuild

ccache is always invalidated #239