Handle consecutive-double-quotes in Windows argument parsing

Windows command line argument processing treats consecutive double quotes
as a single double-quote. This patch implements this functionality.

Differential Revision: https://reviews.llvm.org/D58662

llvm-svn: 356193

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/Support/CommandLine.cpp b/llvm/lib/Support/CommandLine.cpp
index 39991a8905d..c1193f90e8f 100644
--- a/llvm/lib/Support/CommandLine.cpp
+++ b/llvm/lib/Support/CommandLine.cpp
@@ -874,6 +874,13 @@ void cl::TokenizeWindowsCommandLine(StringRef Src, StringSaver &Saver,
     // QUOTED state means that it's reading a token quoted by double quotes.
     if (State == QUOTED) {
       if (C == '"') {
+        if (I < (E - 1) && Src[I + 1] == '"') {
+          // Consecutive double-quotes inside a quoted string implies one
+          // double-quote.
+          Token.push_back('"');
+          I = I + 1;
+          continue;
+        }
         State = UNQUOTED;
         continue;
       }