r358428 - [CommandLineParser] Add DefaultOption flag

[Don Hinton via cfe-commits]

Author: dhinton
Date: Mon Apr 15 10:18:10 2019
New Revision: 358428

URL: http://llvm.org/viewvc/llvm-project?rev=358428&view=rev
Log:
[CommandLineParser] Add DefaultOption flag

Summary: Add DefaultOption flag to CommandLineParser which provides a
default option or alias, but allows users to override it for some
other purpose as needed.

Also, add `-h` as a default alias to `-help`, which can be seamlessly
overridden by applications like llvm-objdump and llvm-readobj which
use `-h` as an alias for other options.

(relanding after revert, r358414)
Added DefaultOptions.clear() to reset().

Reviewers: alexfh, klimek

Reviewed By: klimek

Subscribers: kristina, MaskRay, mehdi_amini, inglorion, dexonsmith, hiraditya, llvm-commits, jhenderson, arphaman, cfe-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D59746

Modified:
    cfe/trunk/lib/Tooling/CommonOptionsParser.cpp

Modified: cfe/trunk/lib/Tooling/CommonOptionsParser.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Tooling/CommonOptionsParser.cpp?rev=358428&r1=358427&r2=358428&view=diff
==============================================================================
--- cfe/trunk/lib/Tooling/CommonOptionsParser.cpp (original)
+++ cfe/trunk/lib/Tooling/CommonOptionsParser.cpp Mon Apr 15 10:18:10 2019
@@ -83,8 +83,6 @@ std::vector<CompileCommand> ArgumentsAdj
 llvm::Error CommonOptionsParser::init(
     int &argc, const char **argv, cl::OptionCategory &Category,
     llvm::cl::NumOccurrencesFlag OccurrencesFlag, const char *Overview) {
-  static cl::opt<bool> Help("h", cl::desc("Alias for -help"), cl::Hidden,
-                            cl::sub(*cl::AllSubCommands));
 
   static cl::opt<std::string> BuildPath("p", cl::desc("Build path"),
                                         cl::Optional, cl::cat(Category),