Describe the Problem

METplus discussion dtcenter/METplus#2127 from @climbfuji notes that while MET version 10.1.1 does compile with Clang on MacOS, MET version 11.0.2 does not. Doing so results in a set of compiler errors and warnings.

This tasks for this issue include:

• Fix the main_v11.0 branch to compile via Clang. And then create an 11.0.3 bugfix release.
• Fix the develop branch to compile via Clang.

The remainder of these changes have been moved to issue MET #2564.

• Update the MET documentation on the develop branch with information about Clang.
• Add a new GHA test to the develop branch to compile with Clang for each pull request to ensure that it continues working. Note that this will require adding a new tag to the dtcenter/METbaseimage repository to provide the environment in which MET should be compiled via Clang.
• Consider also enhancing compile_MET_all.sh to support Clang.

As noted in dtcenter/METplus#2127, test the compilation using Clang version 13.

Expected Behavior

MET version 11.0.2 (and all future versions) should compile with Clang.

Environment

Describe your runtime environment:
1. Machine: Mac Laptop
2. OS: MacOS Monterey (version 12.6.2)
3. Software version number(s): MET version 11.0.2 or the main_v11.0 branch

Relevant Deadlines

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Funding Source

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Define the Metadata

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Projects and Milestone

• Select Organization level Project for support of the current coordinated release
• Select Repository level Project for development toward the next official release or add alert: NEED PROJECT ASSIGNMENT label
• Select Milestone as the next bugfix version

Define Related Issue(s)

Consider the impact to the other METplus components.

• METplus, MET, METdataio, METviewer, METexpress, METcalcpy, METplotpy
  None needed.

Bugfix Checklist

See the METplus Workflow for details.

• Complete the issue definition above, including the Time Estimate and Funding Source.
• Fork this repository or create a branch of main_<Version>.
  Branch name: bugfix_<Issue Number>_main_<Version>_<Description>
• Fix the bug and test your changes.
• Add/update log messages for easier debugging.
• Add/update unit tests.
• Add/update documentation.
• Push local changes to GitHub.
• Submit a pull request to merge into main_<Version>.
  Pull request: bugfix <Issue Number> main_<Version> <Description>
• Define the pull request metadata, as permissions allow.
  Select: Reviewer(s) and Development issue
  Select: Organization level software support Project for the current coordinated release
  Select: Milestone as the next bugfix version
• Iterate until the reviewer(s) accept and merge your changes.
• Delete your fork or branch.
• Complete the steps above to fix the bug on the develop branch.
  Branch name: bugfix_<Issue Number>_develop_<Description>
  Pull request: bugfix <Issue Number> develop <Description>
  Select: Reviewer(s) and Development issue
  Select: Repository level development cycle Project for the next official release
  Select: Milestone as the next official version
• Close this issue.