The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/toolchain-utils/+/fcf26b3b89a7893c7430841ab153e1a58d657c12

commit fcf26b3b89a7893c7430841ab153e1a58d657c12
Author: Manoj Gupta <manojgupta@google.com>
Date: Tue Jul 11 23:49:35 2017

Fix compiler bisection tests nowrapper script.

SAVE_DIR was being overwritten. Inside the condition,
SAVE_DIR is not needed. Just use DIR directly.

BUG= chromium:740230 
TEST= ./full_bisect_test/run-test-nowrapper.sh works.

Change-Id: Ic35d3039f6fd31f2a5f3a0d4812568eaceda4742
Reviewed-on: https://chromium-review.googlesource.com/567364
Reviewed-by: Caroline Tice <cmtice@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>

[modify] https://crrev.com/fcf26b3b89a7893c7430841ab153e1a58d657c12/binary_search_tool/full_bisect_test/run-test-nowrapper.sh

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/faad71b7564137fd1f05f99099daee5d27d2775d

commit faad71b7564137fd1f05f99099daee5d27d2775d
Author: Manoj Gupta <manojgupta@google.com>
Date: Wed Jul 12 23:19:23 2017

GCC: Update bisection driver wrapper.

Cache more filenames besides ".o".
Return correct compiler exit code in bisection.
Also uprev gcc ebuild to make this change effective.

BUG= chromium:740230 
TEST=Files ending in non .o e.g. .ko or .os are cached.
TEST=Correct exit code is returned in object bisection.

Change-Id: I8498ff51dca230023bbf1a2c91ba6977084d0e94
Reviewed-on: https://chromium-review.googlesource.com/563710
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Trybot-Ready: Manoj Gupta <manojgupta@chromium.org>

[rename] https://crrev.com/faad71b7564137fd1f05f99099daee5d27d2775d/sys-devel/gcc/gcc-4.9.2-r160.ebuild
[modify] https://crrev.com/faad71b7564137fd1f05f99099daee5d27d2775d/sys-devel/gcc/files/sysroot_wrapper.hardened.body
[modify] https://crrev.com/faad71b7564137fd1f05f99099daee5d27d2775d/sys-devel/gcc/files/bisect_driver.py