Diamond / Synplify Pro: "WARNING - MT116 |Paths from clock (<clk1_name>:r/f) to clock (<clk2_name>:r/f) are overconstrained because the required time of&nbsp;<delta value="" in="" ns="">ns is too small."</delta></clk2_name></clk1_name>

Diamond / Synplify Pro: "WARNING - MT116 |Paths from clock (<clk1_name>:r/f) to clock (<clk2_name>:r/f) are overconstrained because the required time of&nbsp;<delta value="" in="" ns="">ns is too small."</delta></clk2_name></clk1_name>

In Diamond with Synplify Pro as the synthesis tool, these warnings can be observed in the CCK report and the SRR file:
 
CCK Report: