BUG: Include less content as input to "rule hash" computation.

  - The rule hash should use only commands specified by the user.
  - No make output (echo and progress) rules should be included.
  - No outputs or dependencies need be included.  The native build tool
    will take care of them.

Source/cmGlobalGenerator.cxx

@@ -1943,8 +1943,8 @@ cmGlobalGenerator::GetDirectoryContent(std::string const& dir, bool needDisk)
 //----------------------------------------------------------------------------
 void
 cmGlobalGenerator::AddRuleHash(const std::vector<std::string>& outputs,
-                               const std::vector<std::string>& depends,
-                               const std::vector<std::string>& commands)
+                               std::vector<std::string>::const_iterator first,
+                               std::vector<std::string>::const_iterator last)
 {
 #if defined(CMAKE_BUILD_WITH_CMAKE)
   // Ignore if there are no outputs.
@@ -1960,22 +1960,7 @@ cmGlobalGenerator::AddRuleHash(const std::vector<std::string>& outputs,
   int length;
   cmsysMD5* sum = cmsysMD5_New();
   cmsysMD5_Initialize(sum);
-  for(std::vector<std::string>::const_iterator i = outputs.begin();
-      i != outputs.end(); ++i)
-    {
-    data = reinterpret_cast<unsigned char const*>(i->c_str());
-    length = static_cast<int>(i->length());
-    cmsysMD5_Append(sum, data, length);
-    }
-  for(std::vector<std::string>::const_iterator i = depends.begin();
-      i != depends.end(); ++i)
-    {
-    data = reinterpret_cast<unsigned char const*>(i->c_str());
-    length = static_cast<int>(i->length());
-    cmsysMD5_Append(sum, data, length);
-    }
-  for(std::vector<std::string>::const_iterator i = commands.begin();
-      i != commands.end(); ++i)
+  for(std::vector<std::string>::const_iterator i = first; i != last; ++i)
     {
     data = reinterpret_cast<unsigned char const*>(i->c_str());
     length = static_cast<int>(i->length());

Source/cmGlobalGenerator.h

@@ -246,8 +246,8 @@ public:
   void GetFilesReplacedDuringGenerate(std::vector<std::string>& filenames);
 
   void AddRuleHash(const std::vector<std::string>& outputs,
-                   const std::vector<std::string>& depends,
-                   const std::vector<std::string>& commands);
+                   std::vector<std::string>::const_iterator first,
+                   std::vector<std::string>::const_iterator last);
 
 protected:
   // for a project collect all its targets by following depend

Source/cmMakefileTargetGenerator.cxx

@@ -1116,6 +1116,10 @@ void cmMakefileTargetGenerator
       ->AppendEcho(commands, comment.c_str(),
                    cmLocalUnixMakefileGenerator3::EchoGenerate);
     }
+  // Below we need to skip over the echo and progress commands.
+  unsigned int skip = static_cast<unsigned int>(commands.size());
+
+  // Now append the actual user-specified commands.
   this->LocalGenerator->AppendCustomCommand(commands, cc);
 
   // Collect the dependencies.
@@ -1144,7 +1148,9 @@ void cmMakefileTargetGenerator
   // If the rule has changed make sure the output is rebuilt.
   if(!symbolic)
     {
-    this->GlobalGenerator->AddRuleHash(cc.GetOutputs(), depends, commands);
+    this->GlobalGenerator->AddRuleHash(cc.GetOutputs(),
+                                       commands.begin()+skip,
+                                       commands.end());
     }
   }