UPSTREAM: config.mk: use memoization in cc-option macro to speed up compilation

Apply memoization to cc-option macro by caching the results of the
gcc calls. This macro is called very often so using cached results
leads to faster compilation times.

This feature can be enabled by setting CACHE_CC_OPTIONS=y in the
environment.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
(cherry picked from commit f5fd7cd17552daf41677f6aa1c9eef48055c98a8)

Change-Id: I76d9d6ccab7ba2aefc1e63a5f5e16c8a7aeadef7
Reviewed-on: https://gerrit.chromium.org/gerrit/11807
Reviewed-by: Doug Anderson <dianders@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Commit-Ready: Simon Glass <sjg@chromium.org>

0 files changed, 0 insertions, 0 deletions