[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.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@166444 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 4f0cfa8..1de547d 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -1001,10 +1001,10 @@
for (arg_iterator I = Args.filtered_begin(OPT_W_Group),
E = Args.filtered_end(); I != E; ++I) {
Arg *A = *I;
- // If the argument is a pure flag, add its name (minus the "-W" at the beginning)
+ // If the argument is a pure flag, add its name (minus the "W" at the beginning)
// to the warning list. Else, add its value (for the OPT_W case).
if (A->getOption().getKind() == Option::FlagClass) {
- Warnings.push_back(A->getOption().getName().substr(2));
+ Warnings.push_back(A->getOption().getName().substr(1));
} else {
for (unsigned Idx = 0, End = A->getNumValues();
Idx < End; ++Idx) {