CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY
    protobuf_BUILD_LIBPROTOC


g++: internal compiler error: Terminated (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.
make[2]: *** [source_subfolder/cmake/CMakeFiles/libprotoc.dir/__/src/google/protobuf/compiler/csharp/csharp_enum.cc.o] Error 4
make[2]: *** Waiting for unfinished jobs....
g++: internal compiler error: Terminated (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.
make[2]: *** [source_subfolder/cmake/CMakeFiles/libprotoc.dir/__/src/google/protobuf/compiler/csharp/csharp_enum_field.cc.o] Error 4
Terminated
make[2]: *** [source_subfolder/cmake/CMakeFiles/libprotoc.dir/__/src/google/protobuf/compiler/csharp/csharp_doc_comment.cc.o] Error 143
make[1]: *** [source_subfolder/cmake/CMakeFiles/libprotoc.dir/all] Error 2
make: *** [all] Error 2
protobuf/3.9.1: ERROR: Package '249ff9c5bcc87bcf7e34b92c9392e00d06f0efab' build failed
protobuf/3.9.1: WARN: Build folder /home/conan/w/cci_PR-4682/.conan/data/protobuf/3.9.1/_/_/build/249ff9c5bcc87bcf7e34b92c9392e00d06f0efab
ERROR: protobuf/3.9.1: Error in build() method, line 152
	cmake.build()
	ConanException: Error 2 while executing cmake --build '/home/conan/w/cci_PR-4682/.conan/data/protobuf/3.9.1/_/_/build/249ff9c5bcc87bcf7e34b92c9392e00d06f0efab/build_subfolder' '--' '-j3'
Terminated