build_status blocks case rebuild #4239

Brief summary of bug

Using ctsm5.4.060, when a build fails (e.g. due to a syntax error), build_status is set to 1 in env_build. Trying to rebuild after correcting build error is then blocked with the following message:

BUILD_STATUS' has changed from 0 to 1
ERROR: For your changes to take effect, run:
./case.build --clean-all
./case.build

This is undesirable because it forces a complete clean and rebuild, instead of just rebuilding necessary files. A work-around is to manually set build_status to 0 with ./xmlchange BUILD_STATUS=0; then ./case.build can proceed.

General bug information

CTSM version you are using: ctsm5.4.060

Does this bug cause significantly incorrect results in the model's science? No

Configurations affected: anytime the build fails and you have to rerun, because there was a problem in one of the Fortran source files

Details of bug

In the chat discussion, Erik suggests that likely it's the changes that came in with cime6.5.4 that was brought in with ctsm5.4.054. Erik, replicated this in the latest dev version. It only happens when the build fails. But, that's the time that you want it to just rebuild the few files that failed.

Erik will open a corresponding CIME issue.