[LLVMbugs] [Bug 429] NEW: CommandLine should provide program name in error output

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=429

           Summary: CommandLine should provide program name in error output
           Product: libraries
           Version: 1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Support Libraries
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: rspencer at x10sys.com


Currently, CommandLine will print out an unadorned error message if it
encounters and error while processing the command line options. For example:

-v option: may only occur zero or one times!

For tools that invoke other tools (like llvmc), this isn't good because it isn't
clear to which tool the -v option was passed. To disambiguate, we need to have
CommandLine (and anything else!) that exits with an error message to print out
the program's name.

There's two solutions to this:

1. make CommandLine always throw std::string()
2. make CommandLine print argv[0] first.



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