Commits
Merging in latest from upstream (HDFFV/hdf5:refs/heads/develop) * commit '5ea58acf8a2bdf8ca19d4c86d9ef94fbc4ac449f': Add missing ')'. Add C++ warnings treated as error for autotools builds. Move macro ADD_H5_CFLAGS to cmake_ext_mod/HDFMacros.cmake and remove duplicate versions. Address PR suggestions and add overlooked GCC compiler version flags. Don't add general warnings flags for unsupported old versions of gcc and g++ (older than gcc/g++ 4.2). Correct gnu-cxxflags to determine warnings flags to be added based on C++ compiler version instead of C compiler version.