GenEx: Fix reporting about not-found include directories and libraries.

This fixes a regression introduced in commit 290e92ad (Move
GetIncludeDirectories to cmGeneratorTarget, 2012-09-16) which loops over
cmGeneratorTargets before they get created, so the container is empty.

1 files changed, 7 insertions, 0 deletions

diff --git a/Source/cmGeneratorExpression.h b/Source/cmGeneratorExpression.h
index d37ce97..29d3f44 100644
--- a/Source/cmGeneratorExpression.h
+++ b/Source/cmGeneratorExpression.h
@@ -48,6 +48,13 @@ public:
   const cmCompiledGeneratorExpression& Parse(std::string const& input);
   const cmCompiledGeneratorExpression& Parse(const char* input);
 
+  enum PreprocessContext {
+    StripAllGeneratorExpressions
+  };
+
+  static std::string Preprocess(const std::string &input,
+                                PreprocessContext context);
+
 private:
   cmGeneratorExpression(const cmGeneratorExpression &);
   void operator=(const cmGeneratorExpression &);