ENH: Moved dependency integrity check from CheckBuildSystem over to a per-target UpdateDependencies step. This greatly reduces the startup time for make processes and allows individual targets to be built without a global dependency check.

1 files changed, 6 insertions, 3 deletions

diff --git a/Source/cmDepends.h b/Source/cmDepends.h
index b6eda70..40dc59a 100644
--- a/Source/cmDepends.h
+++ b/Source/cmDepends.h
@@ -55,8 +55,11 @@ public:
   bool Write(const char *src, const char *obj,
     std::ostream &makeDepends, std::ostream &internalDepends);
   
-  /** Check dependencies for the target file.  */
-  void Check(const char *makeFile, const char* internalFile);
+  /** Check dependencies for the target file.  Returns true if
+      dependencies are okay and false if they must be generated.  If
+      they must be generated Clear has already been called to wipe out
+      the old dependencies.  */
+  bool Check(const char *makeFile, const char* internalFile);
 
   /** Clear dependencies for the target file so they will be regenerated.  */
   void Clear(const char *file);
@@ -70,7 +73,7 @@ protected:
   // Write dependencies for the target file to the given stream.
   // Return true for success and false for failure.
   virtual bool WriteDependencies(const char *src, const char* obj,
-    std::ostream& makeDepends, std::ostream& internalDepends)=0;
+    std::ostream& makeDepends, std::ostream& internalDepends);
 
   // Check dependencies for the target file in the given stream.
   // Return false if dependencies must be regenerated and true