fixed -Wlifetime-safety-intra-tu-suggestions CLang warnings

disabled `-Wlifetime-safety-intra-tu-suggestions` Clang warning for now

Author: firewave

simplecpp.h

@@ -45,6 +45,16 @@
 #  include <sys/types.h>
 #endif
 
+#if defined(__has_cpp_attribute)
+#  if __has_cpp_attribute (clang::lifetimebound)
+#    define SIMPLECPP_LIFETIMEBOUND [[clang::lifetimebound]]
+#  else
+#    define SIMPLECPP_LIFETIMEBOUND
+#  endif
+#else
+#  define SIMPLECPP_LIFETIMEBOUND
+#endif
+
 #if defined(_MSC_VER)
 #  pragma warning(push)
 // suppress warnings about "conversion from 'type1' to 'type2', possible loss of data"