include(CheckCCompilerFlag)
CHECK_C_COMPILER_FLAG("-march=armv7-a" COMPILER_SUPPORTS_ARMV7_A)
if(COMPILER_SUPPORTS_ARMV7_A)
   MESSAGE("GCC Support armv7-a")
else(not COMPILER_SUPPORTS_ARMV7_A)
   MESSAGE("GCC Not Support armv7-a")
endif()