[Support] Add optional prefix to convenience helpers in WithColor.

Several tools prefix the error/warning/note output with the name of the
tool. One such tool is LLD for example. This commit adds as an optional
'Prefix' argument to the convenience helpers.

llvm-svn: 330526

2 files changed, 11 insertions, 6 deletions

diff --git a/llvm/include/llvm/Support/WithColor.h b/llvm/include/llvm/Support/WithColor.h
index 59f05ecc3c3..ee1e05cda32 100644
--- a/llvm/include/llvm/Support/WithColor.h
+++ b/llvm/include/llvm/Support/WithColor.h
@@ -10,6 +10,8 @@
 #ifndef LLVM_SUPPORT_WITHCOLOR_H
 #define LLVM_SUPPORT_WITHCOLOR_H
 
+#include "llvm/ADT/StringRef.h"
+
 namespace llvm {
 
 class raw_ostream;
@@ -50,11 +52,11 @@ public:
   static raw_ostream &note();
 
   /// Convenience method for printing "error: " to the given stream.
-  static raw_ostream &error(raw_ostream &OS);
+  static raw_ostream &error(raw_ostream &OS, StringRef Prefix = "");
   /// Convenience method for printing "warning: " to the given stream.
-  static raw_ostream &warning(raw_ostream &OS);
+  static raw_ostream &warning(raw_ostream &OS, StringRef Prefix = "");
   /// Convenience method for printing "note: " to the given stream.
-  static raw_ostream &note(raw_ostream &OS);
+  static raw_ostream &note(raw_ostream &OS, StringRef Prefix = "");
 };
 
 } // end namespace llvm
diff --git a/llvm/lib/Support/WithColor.cpp b/llvm/lib/Support/WithColor.cpp
index 5a1364ff3cb..c3ab35bd891 100644
--- a/llvm/lib/Support/WithColor.cpp
+++ b/llvm/lib/Support/WithColor.cpp
@@ -65,15 +65,18 @@ raw_ostream &WithColor::warning() { return warning(errs()); }
 
 raw_ostream &WithColor::note() { return note(errs()); }
 
-raw_ostream &WithColor::error(raw_ostream &OS) {
+raw_ostream &WithColor::error(raw_ostream &OS, StringRef Prefix) {
+  OS << Prefix;
   return WithColor(OS, HighlightColor::Error).get() << "error: ";
 }
 
-raw_ostream &WithColor::warning(raw_ostream &OS) {
+raw_ostream &WithColor::warning(raw_ostream &OS, StringRef Prefix) {
+  OS << Prefix;
   return WithColor(OS, HighlightColor::Warning).get() << "warning: ";
 }
 
-raw_ostream &WithColor::note(raw_ostream &OS) {
+raw_ostream &WithColor::note(raw_ostream &OS, StringRef Prefix) {
+  OS << Prefix;
   return WithColor(OS, HighlightColor::Note).get() << "note: ";
 }