[Options] Add prefixes to options.

Each option has a set of prefixes. When matching an argument such as
-funroll-loops. First the leading - is removed as it is a prefix. Then
a lower_bound search for "funroll-loops" is done against the option table by
option name. From there each option prefix + option name combination is tested
against the argument.

This allows us to support Microsoft style options where both / and - are valid
prefixes. It also simplifies the cases we already have where options come in
both - and -- forms. Almost every option for gnu-ld happens to have this form.

llvm-svn: 166444

1 files changed, 3 insertions, 3 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 7848b488d37..54ec0cb1a90 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -1175,8 +1175,8 @@ void Clang::AddX86TargetArgs(const ArgList &Args,
     (*it)->claim();
 
     // Skip over "-m".
-    assert(Name.startswith("-m") && "Invalid feature name.");
-    Name = Name.substr(2);
+    assert(Name.startswith("m") && "Invalid feature name.");
+    Name = Name.substr(1);
 
     bool IsNegative = Name.startswith("no-");
     if (IsNegative)
@@ -2283,7 +2283,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
       CmdArgs.push_back("-fbounds-checking=1");
   }
 
-  if (Args.hasArg(options::OPT__relocatable_pch))
+  if (Args.hasArg(options::OPT_relocatable_pch))
     CmdArgs.push_back("-relocatable-pch");
 
   if (Arg *A = Args.getLastArg(options::OPT_fconstant_string_class_EQ)) {