cmake HAVE_SYMENGINE_STD_TO_STRING examples

symforce-org/symforce third_party/symengine/CMakeLists.txt :138

try_compile(HAVE_SYMENGINE_STD_TO_STRING "${CMAKE_CURRENT_BINARY_DIR}/cxx" "${CMAKE_CURRENT_SOURCE_DIR}/cmake/checkstdtostring.cpp"
	CMAKE_FLAGS "-DCOMPILE_DEFINITIONS=${CMAKE_CXX_FLAGS}")

symforce-org/symforce third_party/symengine/CMakeLists.txt :709

message("HAVE_SYMENGINE_STD_TO_STRING: ${HAVE_SYMENGINE_STD_TO_STRING}")