[DAFFODIL-2500] Remove dependence on argp and gcc

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 3.1.0
• Fix Version/s: 3.1.0
• Component/s: Back End C-Generator
• Assignee: Unassigned
• Reporter: John Interrante
• Created: 21/Apr/21 19:40
• Updated: 07/May/21 16:42
• Resolved: 02/May/21 18:54

Description

Update BUILD.md and the github actions to use clang instead of gcc. Will have to find the correct steps on Fedora / Linux / Windows and check they work (e.g., install clang-10 package on Ubuntu and set CC=clang-10 and AR=llvm-ar-10 environment variables).

Likewise, replace argp calls with getopt calls in daffodil_main.c and daffodil_argp.c even though it means giving up long options and other nice features that argp has.  Remove argp dependency from BUILD.md and the github actions.