Fix warning with gcc 4.4
Fix warning with gcc 4.4

jafyvilla/CMake,shuaibarshad/KAUST-CMake,jafyvilla/CMake,shurikasa/CMake,ptoharia/CMake,ptoharia/CMake,jafyvilla/CMake,jafyvilla/CMake,biddisco/CMake,shurikasa/CMake,biddisco/CMake,shurikasa/CMake,shuaibarshad/KAUST-CMake,shurikasa/CMake,shuaibarshad/KAUST-CMake,ptoharia/CMake,ptoharia/CMake,biddisco/CMake,shuaibarshad/KAUST-CMake,biddisco/CMake