[ccache] Fwd: .ccache record full path

[宋宋俊慶]

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