[Support] Fix prefix logic in WithColor.

When a prefix is passed, we need to print a colon a space after it, not
just the prefix.

llvm-svn: 330535

1 files changed, 6 insertions, 3 deletions

diff --git a/llvm/lib/Support/WithColor.cpp b/llvm/lib/Support/WithColor.cpp
index c3ab35bd891..a663c69ac3e 100644
--- a/llvm/lib/Support/WithColor.cpp
+++ b/llvm/lib/Support/WithColor.cpp
@@ -66,17 +66,20 @@ raw_ostream &WithColor::warning() { return warning(errs()); }
 raw_ostream &WithColor::note() { return note(errs()); }
 
 raw_ostream &WithColor::error(raw_ostream &OS, StringRef Prefix) {
-  OS << Prefix;
+  if (!Prefix.empty())
+    OS << Prefix << ": ";
   return WithColor(OS, HighlightColor::Error).get() << "error: ";
 }
 
 raw_ostream &WithColor::warning(raw_ostream &OS, StringRef Prefix) {
-  OS << Prefix;
+  if (!Prefix.empty())
+    OS << Prefix << ": ";
   return WithColor(OS, HighlightColor::Warning).get() << "warning: ";
 }
 
 raw_ostream &WithColor::note(raw_ostream &OS, StringRef Prefix) {
-  OS << Prefix;
+  if (!Prefix.empty())
+    OS << Prefix << ": ";
   return WithColor(OS, HighlightColor::Note).get() << "note: ";
 }