Yin Fengwei 8dcede7693 Makefile: disable fcf-protection for some build env ...

In some build env (Ubuntu 19.10 as example), gcc enabled the option
-fcf-protection by default. But this option is not compatible with
-mindirect-branch. Which could trigger following build error:
  fail to build with gcc-9 [error: ‘-mindirect-branch’ and
  ‘-fcf-protection’ are not compatible]

-mindirect-branch is mandatory for retpoline mitigation and always
enabled for ACRN build. We disable -fcf-protection here for ACRN
build.

Tracked-On: #4358
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Wu Binbin <binbin.wu@intel.com>

2020-02-17 08:49:38 +08:00

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