Dollar signs in depfiles are escaped as "$$", not "\$".

See http://llvm.org/PR15642. I checked that gcc does produce depfiles
containing "$$" for files with "$" signs in their name (and as of
r178540, so does clang). I also checked that .d files that escape dollar
signs with "\$" are not read correctly by make.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/depfile_parser.in.cc b/src/depfile_parser.in.cc
index f96cdb3..cf24a09 100644
--- a/src/depfile_parser.in.cc
+++ b/src/depfile_parser.in.cc
@@ -55,13 +55,18 @@ bool DepfileParser::Parse(string* content, string* err) {
       re2c:indent:string = "  ";
 
       nul = "\000";
-      escape = [ \\#*$[|];
+      escape = [ \\#*[|];
 
       '\\' escape {
         // De-escape backslashed character.
         *out++ = yych;
         continue;
       }
+      '$$' {
+        // De-escape dollar character.
+        *out++ = '$';
+        continue;
+      }
       '\\' [^\000\n] {
         // Let backslash before other characters through verbatim.
         *out++ = '\\';