Handle colons as a special case in the generator expression parser.

Like the special case for commas, this ensures that the colon only has
special meaning as the delimiter between the identifier and the
parameters of a particular expression, but constructs such as

 INCLUDE_DIRECTORIES "$<1:C:\foo>"

are legal.

1 files changed, 5 insertions, 0 deletions

diff --git a/Source/cmGeneratorExpressionParser.cxx b/Source/cmGeneratorExpressionParser.cxx
index 2a5cc7a..d3c4aa3 100644
--- a/Source/cmGeneratorExpressionParser.cxx
+++ b/Source/cmGeneratorExpressionParser.cxx
@@ -127,6 +127,11 @@ void cmGeneratorExpressionParser::ParseGeneratorExpression(
         parameters.resize(parameters.size() + 1);
         ++this->it;
         }
+      if (this->it->TokenType == cmGeneratorExpressionToken::ColonSeparator)
+        {
+        extendText(*(parameters.end() - 1), this->it);
+        ++this->it;
+        }
       if (this->it == this->Tokens.end())
         {
         break;