[Buildroot] [Bug 10536] Finding non-relative paths in the ccache

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=10536

--- Comment #5 from Mark Hirota <mhirota at impinj.com> ---
Arnout: yes, we have seen a failure as Trent describes, but with 2 similar
configs: r700 and r700_rescue.

>>> uboot-tools 2017.09 Building
PATH="/mnt/work/output/r700/host/bin:/mnt/work/output/r700/host/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
/usr/bin/make -j5 -C /mnt/work/output/r700/build/uboot-tools-2017.09
CROSS_COMPILE="/mnt/work/output/r700/host/bin/arm-buildroot-linux-gnueabihf-"
CFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -O3 
-fstack-protector-strong" LDFLAGS=""
STRIP=/mnt/work/output/r700/host/bin/arm-buildroot-linux-gnueabihf-strip
CROSS_BUILD_TOOLS=y tools-only
  CHK     include/config/uboot.release
  CHK     include/generated/timestamp_autogenerated.h
  HOSTCC  scripts/basic/fixdep
  UPD     include/generated/timestamp_autogenerated.h
  UPD     include/config/uboot.release
  CHK     include/generated/version_autogenerated.h
  UPD     include/generated/version_autogenerated.h
  HOSTCC  tools/mkenvimage.o
  WRAP    tools/lib/crc32.c
  HOSTCC  tools/os_support.o
  HOSTCC  tools/aisimage.o
  HOSTCC  tools/atmelimage.o
  WRAP    tools/common/bootm.c
  HOSTCC  tools/default_image.o
fixdep: error opening config file:
/mnt/work/output/r700_rescue/host/lib/gcc/arm-buildroot-linux-gnueabihf/7.2.0/include/stddef.h:
No such file or directory

Our build automation performs clean builds, but shares a buildroot-ccache
across them.  This type of failure forces us to build the projects on separate
build hosts to avoid hitting it.

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