[libOption] - Add flag allowing to print options aliases in help text.

By default, we display only options that are not
hidden and have help texts. This patch adds flag
allowing to display aliases that have no help text.
In this case help text of aliased option used instead.

Differential revision: https://reviews.llvm.org/D35476

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309087 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 15 insertions, 7 deletions

diff --git a/lib/Option/OptTable.cpp b/lib/Option/OptTable.cpp
index f3b438e829d..071c9db8720 100644
--- a/lib/Option/OptTable.cpp
+++ b/lib/Option/OptTable.cpp
@@ -444,15 +444,14 @@ static const char *getOptionHelpGroup(const OptTable &Opts, OptSpecifier Id) {
 }
 
 void OptTable::PrintHelp(raw_ostream &OS, const char *Name, const char *Title,
-                         bool ShowHidden) const {
+                         bool ShowHidden, bool ShowAllAliases) const {
   PrintHelp(OS, Name, Title, /*Include*/ 0, /*Exclude*/
-            (ShowHidden ? 0 : HelpHidden));
+            (ShowHidden ? 0 : HelpHidden), ShowAllAliases);
 }
 
-
 void OptTable::PrintHelp(raw_ostream &OS, const char *Name, const char *Title,
-                         unsigned FlagsToInclude,
-                         unsigned FlagsToExclude) const {
+                         unsigned FlagsToInclude, unsigned FlagsToExclude,
+                         bool ShowAllAliases) const {
   OS << "OVERVIEW: " << Title << "\n";
   OS << '\n';
   OS << "USAGE: " << Name << " [options] <inputs>\n";
@@ -476,10 +475,19 @@ void OptTable::PrintHelp(raw_ostream &OS, const char *Name, const char *Title,
     if (Flags & FlagsToExclude)
       continue;
 
-    if (const char *Text = getOptionHelpText(Id)) {
+    // If an alias doesn't have a help text, show a help text for the aliased
+    // option instead.
+    const char *HelpText = getOptionHelpText(Id);
+    if (!HelpText && ShowAllAliases) {
+      const Option Alias = getOption(Id).getAlias();
+      if (Alias.isValid())
+        HelpText = getOptionHelpText(Alias.getID());
+    }
+
+    if (HelpText) {
       const char *HelpGroup = getOptionHelpGroup(*this, Id);
       const std::string &OptName = getOptionHelpName(*this, Id);
-      GroupedOptionHelp[HelpGroup].push_back({OptName, Text});
+      GroupedOptionHelp[HelpGroup].push_back({OptName, HelpText});
     }
   }