The following URL provides a table for make command exit values for you to refer.
Source: Make Exit Status Values
The following URL provides a table for make command exit values for you to refer.
Source: Make Exit Status Values
You might have faced Makefile not continuing with rest of the commands if any of the previous commands returns exit code as -1 or any negative values. There is a simple way for make to ignore these return codes and continue the build. Just add ‘-‘ before the command for which build is failing. Ensure that this tip is used only for the case where the tool is returning failure and the objective of the tool is working fine.