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, 2 insertions, 2 deletions

diff --git a/Source/cmDependsC.h b/Source/cmDependsC.h
index 74f764d..16dfad7 100644
--- a/Source/cmDependsC.h
+++ b/Source/cmDependsC.h
@@ -33,8 +33,8 @@ public:
 
 protected:
   // Implement writing/checking methods required by superclass.
-  virtual bool WriteDependencies(const char *src,
-                                 const char *file,
+  virtual bool WriteDependencies(const std::set<std::string>& sources,
+                                 const std::string&           obj,
                                  std::ostream& makeDepends,
                                  std::ostream& internalDepends);