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This fixes problem with missing symbol __va_copy, see
https://github.com/protocolbuffers/protobuf/pull/6848.
--- a/ruby/ext/google/protobuf_c/extconf.rb
+++ b/ruby/ext/google/protobuf_c/extconf.rb
@@ -3,9 +3,9 @@
require 'mkmf'
if RUBY_PLATFORM =~ /darwin/ || RUBY_PLATFORM =~ /linux/
- $CFLAGS += " -std=gnu90 -O3 -DNDEBUG -Wall -Wdeclaration-after-statement -Wsign-compare"
+ $CFLAGS += " -std=gnu99 -DNDEBUG -Wall -Wdeclaration-after-statement -Wsign-compare"
else
- $CFLAGS += " -std=gnu90 -O3 -DNDEBUG"
+ $CFLAGS += " -std=gnu99 -DNDEBUG"
end
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