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, 3 insertions, 3 deletions

diff --git a/Source/cmDependsJava.cxx b/Source/cmDependsJava.cxx
index ba0e8fbe65..949d465159 100644
--- a/Source/cmDependsJava.cxx
+++ b/Source/cmDependsJava.cxx
@@ -25,11 +25,11 @@ cmDependsJava::~cmDependsJava()
 }
 
 //----------------------------------------------------------------------------
-bool cmDependsJava::WriteDependencies(const char *src, const char *,
-  std::ostream&, std::ostream&)
+bool cmDependsJava::WriteDependencies(const std::set<std::string>& sources,
+    const std::string&, std::ostream&, std::ostream&)
 {
   // Make sure this is a scanning instance.
-  if(!src || src[0] == '\0')
+  if(sources.empty() || sources.begin()->empty())
     {
     cmSystemTools::Error("Cannot scan dependencies without an source file.");
     return false;