[Option] Support MultiArg in --help
Currently, if you use a MultiArg<> option, then printing out the help/usage
message will cause an assert. This fixes getOptionHelpName() to work with
MultiArg Options.
llvm-svn: 215770
diff --git a/llvm/lib/Option/OptTable.cpp b/llvm/lib/Option/OptTable.cpp
index 6842f4d5..ef9a3e7 100644
--- a/llvm/lib/Option/OptTable.cpp
+++ b/llvm/lib/Option/OptTable.cpp
@@ -300,7 +300,18 @@
llvm_unreachable("Invalid option with help text.");
case Option::MultiArgClass:
- llvm_unreachable("Cannot print metavar for this kind of option.");
+ if (const char *MetaVarName = Opts.getOptionMetaVar(Id)) {
+ // For MultiArgs, metavar is full list of all argument names.
+ Name += ' ';
+ Name += MetaVarName;
+ }
+ else {
+ // For MultiArgs<N>, if metavar not supplied, print <value> N times.
+ for (unsigned i=0, e=O.getNumArgs(); i< e; ++i) {
+ Name += " <value>";
+ }
+ }
+ break;
case Option::FlagClass:
break;