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Makefile: disable fcf-protection for some build env

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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>
This commit is contained in:
Yin Fengwei 2020-01-13 10:02:02 +08:00 committed by wenlingz
parent 8ddbfc268c
commit 8dcede7693
1 changed files with 7 additions and 0 deletions
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7
hypervisor/Makefile
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@ -97,6 +97,13 @@ endif
CFLAGS += -DSTACK_PROTECTOR
endif
# In case using Ubuntu 19.10 as build environment, its gcc has -fcf-protection enabled
# by default. But this option is not compatible with -mindirect-branch:
# https://bugs.launchpad.net/ubuntu/+source/gcc-9/+bug/1830961
#
# We disable the -fcf-protection in ACRN build.
CFLAGS += -fcf-protection=none
ASFLAGS += -m64 -nostdinc -nostdlib
LDFLAGS += -Wl,--gc-sections -nostartfiles -nostdlib