Bug#35123848 failed to compile in static mode

When building with -static-libgcc -static-libstdc++ we need to build the bundled protobuf with static libraries as well. Patch is based on a contribution from: Alex Xing <whuxingying@qq.com> Change-Id: I9abaa01a8579d1958a945e544619e65201ecc2c5

Author: Tor Didriksen

extra/protobuf/CMakeLists.txt

@@ -100,7 +100,13 @@ SET(protobuf_BUILD_EXAMPLES OFF CACHE INTERNAL "")
 IF(SOLARIS)
  SET(protobuf_BUILD_SHARED_LIBS OFF CACHE INTERNAL "")
 ELSE()
- SET(protobuf_BUILD_SHARED_LIBS ON CACHE INTERNAL "")
+ # With static C/C++ libraries, protoc with shared libs will segfault,
+ # so use static libs instead.
+ IF(CMAKE_CXX_FLAGS MATCHES "-static-libgcc")
+ SET(protobuf_BUILD_SHARED_LIBS OFF CACHE INTERNAL "")
+ ELSE()
+ SET(protobuf_BUILD_SHARED_LIBS ON CACHE INTERNAL "")
+ ENDIF()
 ENDIF()
 
 SET(protobuf_MSVC_STATIC_RUNTIME OFF CACHE INTERNAL "")