Makefile: Workaround Borland Make bug with multiple outputs

Given a rule of the form

  out1 out2: dep1
  out1 out2: dep2

Borland Make complains that there are multiple rules for "out1"
even though this works when there is only one output.  Instead
generate

  out1 out2: dep1 dep2

for Borland Make, but only when there are multiple outputs.

Source/cmGlobalBorlandMakefileGenerator.cxx

@@ -49,6 +49,7 @@ cmLocalGenerator *cmGlobalBorlandMakefileGenerator::CreateLocalGenerator()
   lg->SetUnixCD(false);
   lg->SetMakeCommandEscapeTargetTwice(true);
   lg->SetBorlandMakeCurlyHack(true);
+  lg->SetNoMultiOutputMultiDepRules(true);
   return lg;
 }
 

Source/cmLocalUnixMakefileGenerator3.cxx

@@ -92,6 +92,7 @@ cmLocalUnixMakefileGenerator3::cmLocalUnixMakefileGenerator3()
   this->SkipAssemblySourceRules = false;
   this->MakeCommandEscapeTargetTwice = false;
   this->BorlandMakeCurlyHack = false;
+  this->NoMultiOutputMultiDepRules = false;
 }
 
 //----------------------------------------------------------------------------
@@ -696,6 +697,19 @@ cmLocalUnixMakefileGenerator3
     // No dependencies.  The commands will always run.
     os << cmMakeSafe(tgt) << space << ":\n";
     }
+  else if(this->NoMultiOutputMultiDepRules && outputs.size() >= 2)
+    {
+    // Borland make does not understand multiple dependency rules when
+    // there are multiple outputs, so write them all on one line.
+    os << cmMakeSafe(tgt) << space << ":";
+    for(std::vector<std::string>::const_iterator dep = depends.begin();
+        dep != depends.end(); ++dep)
+      {
+      replace = this->Convert(*dep, HOME_OUTPUT, MAKERULE);
+      os << " " << cmMakeSafe(replace);
+      }
+    os << "\n";
+    }
   else
     {
     // Split dependencies into multiple rule lines.  This allows for

Source/cmLocalUnixMakefileGenerator3.h

@@ -161,6 +161,9 @@ public:
   void SetBorlandMakeCurlyHack(bool b)
     { this->BorlandMakeCurlyHack = b; }
 
+  void SetNoMultiOutputMultiDepRules(bool b)
+    { this->NoMultiOutputMultiDepRules = b; }
+
   // used in writing out Cmake files such as WriteDirectoryInformation
   static void WriteCMakeArgument(std::ostream& os, const char* s);
 
@@ -345,6 +348,7 @@ private:
   bool PassMakeflags;
   bool MakeCommandEscapeTargetTwice;
   bool BorlandMakeCurlyHack;
+  bool NoMultiOutputMultiDepRules;
   //==========================================================================
 
   std::string HomeRelativeOutputPath;