This log does not show any build. Apparently, you have hit "build and run" and the project was up to date, so the program was run directly (or you have not pasted the log output from the actual build).
If there are any errors during the build, your program is not executed, so the last build must have been successful with no errors.
The shown return code says by convention that
not everything is ok. A program that exits with no errors should return 0, not 1. However, I don't know your program, maybe everything
is good and you just return the wrong value from
main()