cmake HAVE_LTO_SUPPORT examples

plumonito/dtslam 3rdparty/ceres-solver-1.9.0/CMakeLists.txt :573 

CHECK_CXX_COMPILER_FLAG("-flto" HAVE_LTO_SUPPORT)

plumonito/dtslam 3rdparty/ceres-solver-1.9.0/CMakeLists.txt :579 

ENDIF (HAVE_LTO_SUPPORT)