[Buildroot] [PATCH] package/protobuf: work around gcc bug 85180

Giulio Benetti giulio.benetti at benettiengineering.com
Wed Sep 18 09:11:42 UTC 2019


With Microblaze Gcc version < 8.x the build hangs due to gcc bug
85180: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85180. The bug
shows up when building protobuf with optimization but not when building
with -O0. To work around this, if BR2_TOOLCHAIN_HAS_GCC_BUG_85180=y we
force using -O0.

Fixes:

http://autobuild.buildroot.net/results/73dc9610a13d6e14eec58d529617210d93d5dec4/

Signed-off-by: Giulio Benetti <giulio.benetti at benettiengineering.com>
---
 package/protobuf/protobuf.mk | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/package/protobuf/protobuf.mk b/package/protobuf/protobuf.mk
index e698bac228..699735ce37 100644
--- a/package/protobuf/protobuf.mk
+++ b/package/protobuf/protobuf.mk
@@ -17,6 +17,14 @@ PROTOBUF_LICENSE_FILES = LICENSE
 PROTOBUF_DEPENDENCIES = host-protobuf
 PROTOBUF_CONF_OPTS = --with-protoc=$(HOST_DIR)/bin/protoc
 
+PROTOBUF_CXXFLAGS = $(TARGET_CXXFLAGS)
+
+ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_85180),y)
+PROTOBUF_CXXFLAGS += -O0
+endif
+
+PROTOBUF_CONF_ENV = CXXFLAGS="$(OPUS_CFXXLAGS)"
+
 ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
 PROTOBUF_CONF_ENV += LIBS=-latomic
 endif
-- 
2.20.1



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