Hi, I saw .ccache record full build source code path, it will not re-use in 
different directory, even same source code.
Android N doesn't have this issue?
Does Android O need set other flag?

I posted a part of content for reference.

out/target/product/NB1/obj/EXECUTABLES/toybox_intermediates/toys/posix/chgrp.o: 
\   --> Android N
  external/toybox/toys/posix/chgrp.c external/toybox/toys.h \  --> Android N
  external/toybox/generated/config.h external/toybox/lib/portability.h 
\  --> Android N
  bionic/libc/include/features.h bionic/libc/include/sys/cdefs.h \  --> 
Android N
  bionic/libc/include/android/api-level.h \  --> Android N
  bionic/libc/include/android/versioning.h \  --> Android N
  bionic/libc/include/sys/types.h \  --> Android N
  
/home/cm/android_o/LINUX/android/prebuilts/clang/host/linux-x86/clang-3859424/bin/../lib64/clang/4.0.285906/include/stddef.h
 
\   --> Android O
  bionic/libc/include/stdint.h bionic/libc/include/bits/wchar_limits.h 
\  --> Android N
  bionic/libc/kernel/uapi/linux/types.h \  --> Android N
  bionic/libc/kernel/uapi/asm-arm64/asm/types.h \  --> Android N
  bionic/libc/kernel/uapi/asm-generic/types.h \  --> Android N
  bionic/libc/kernel/uapi/asm-generic/int-ll64.h \  --> Android N

Thanks

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