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POSIX.1-2017 12.2 Utility Syntax Guidelines, Guideline 5 says: > One or more options without option-arguments, followed by at most one option that takes an option-argument, should be accepted when grouped behind one '-' delimiter. i.e. -abc represents -a -b -c. The grouped short options are very common. Many utilities extend the syntax by allowing (an option with an argument) following a sequence of short options. This patch adds the support to OptTable, similar to cl::Group for CommandLine (D58711). llvm-symbolizer will use the feature (D83530). CommandLine is exotic in some aspects. OptTable is preferred if the user wants to get rid of the behaviors. * `cl::opt<bool> i(...)` can be disabled via -i=false or -i=0, which is different from conventional --no-i. * Handling --foo & --no-foo requires a comparison of argument positions, which is a bit clumsy in user code. OptTable::parseOneArg (non-const reference InputArgList) is added along with ParseOneArg (const ArgList &). The duplicate does not look great at first glance. However, The implementation can be simpler if ArgList is mutable. (ParseOneArg is used by clang-cl (FlagsToInclude/FlagsToExclude) and lld COFF (case-insensitive). Adding grouped short options can make the function even more complex.) The implementation allows a long option following a group of short options. We probably should refine the code to disallow this in the future. Allowing this seems benign for now. Reviewed By: grimar, jhenderson Differential Revision: https://reviews.llvm.org/D83639 |
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