tree ddda0f1d52d04ddbee29b82261214718bbfd9b88
parent edd222428715125b9ef2a9a8a064fc32a0d0bd24
author Patrick Georgi <pgeorgi@google.com> 1605907215 +0000
committer Commit Bot <commit-bot@chromium.org> 1606213425 +0000

Makefile: Test for warning flags before using them

Test for warning flags that older gcc versions don't support
and only use them if supported.

BUG=none
TEST=vboot builds with gcc 4.9, ensured with manual tests that the
test_ccflag operator works correctly.

Change-Id: I14c8cbe9a687981f195d481f744db12d8877a3e0
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2550799
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: Patrick Georgi <pgeorgi@chromium.org>
Commit-Queue: Patrick Georgi <pgeorgi@chromium.org>