[Buildroot] [git commit branch/2019.02.x] package/brotli: work around gcc bug 68485

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=61557494367128bac69f42d80c20e107f6c107cf
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2019.02.x

With Microblaze Gcc version <= 9.x the build fails due to gcc bug 68485:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68485. The bug show up when
building brotli with optimization but not when building with -O0. To
work around this, if BR2_TOOLCHAIN_HAS_GCC_BUG_68458=y, we force using
-O0.

Fixes:

  http://autobuild.buildroot.net/results/d86/d86251974a0a348a64d9a1d1fd7d02dd4aff0792/

Signed-off-by: Giulio Benetti <giulio.benetti at micronovasrl.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
(cherry picked from commit 39dde1ffb6a7111c2fa2b340c940e4d3e685aa29)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/brotli/brotli.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/package/brotli/brotli.mk b/package/brotli/brotli.mk
index 2c1ad48753..248bfb9daf 100644
--- a/package/brotli/brotli.mk
+++ b/package/brotli/brotli.mk
@@ -14,4 +14,8 @@ BROTLI_CONF_OPTS = \
 	-DBROTLI_DISABLE_TESTS=ON \
 	-DBROTLI_BUNDLED_MODE=OFF
 
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_68485),y)
+BROTLI_CONF_OPTS += -DCMAKE_C_FLAGS="-O0"
+endif
+
 $(eval $(cmake-package))