cmDepends: allow multiple dependees per depender

This patch is heavily inspired by Michael Wild.

The interfaces cmDepends::Write and cmDepends::WriteDependencies where
extended to allow multiple dependees (sources) per depender (object).
cmDepends::Write first collect all dependencies into a std::set before
passing it to cmDepends::WriteDependencies.

cmDependsC::WriteDependencies also first collects all explicit and
implicit dependencies into a std::set and only then writes
depend.{internal,make}. The implementation of cmDependsFortran simply
loops over all sources and proceeds as before, whereas the cmDependsJava
implementation is as trivial as before.

This is for preventing exponential growth of depend.{internal,make} in
the next commit which fixes dependency-vector erasure in
cmDepends::CheckDependencies.

Inspired-by: Michael Wild <themiwi@users.sourceforge.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/Source/cmDepends.h b/Source/cmDepends.h
index f7dc8811ea..d787eddc6f 100644
--- a/Source/cmDepends.h
+++ b/Source/cmDepends.h
@@ -76,8 +76,10 @@ 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);
+  virtual bool WriteDependencies(const std::set<std::string>& sources,
+                                 const std::string& obj,
+                                 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