ENH: Do not generate install target unless some INSTALL or INSTALL_* commands have been used. This addresses bug#2827.

Source/cmGlobalGenerator.cxx

@@ -42,6 +42,9 @@ cmGlobalGenerator::cmGlobalGenerator()
 
   // Relative paths are not configured in the constructor.
   this->RelativePathsConfigured = false;
+
+  // Whether an install target is needed.
+  this->InstallTargetEnabled = false;
 }
 
 cmGlobalGenerator::~cmGlobalGenerator()
@@ -927,6 +930,11 @@ void cmGlobalGenerator::AddInstallComponent(const char* component)
     }
 }
 
+void cmGlobalGenerator::EnableInstallTarget()
+{
+  this->InstallTargetEnabled = true;
+}
+
 cmLocalGenerator *cmGlobalGenerator::CreateLocalGenerator()
 {
   cmLocalGenerator *lg = new cmLocalGenerator;
@@ -1448,6 +1456,8 @@ void cmGlobalGenerator::CreateDefaultGlobalTargets(cmTargets* targets)
     }
 
   //Install
+  if(this->InstallTargetEnabled)
+    {
     std::string cmd;
     cpackCommandLines.erase(cpackCommandLines.begin(), cpackCommandLines.end());
     singleLine.erase(singleLine.begin(), singleLine.end());
@@ -1510,6 +1520,7 @@ void cmGlobalGenerator::CreateDefaultGlobalTargets(cmTargets* targets)
           &cpackCommandLines, depends);
       }
     }
+}
 
 cmTarget cmGlobalGenerator::CreateGlobalTarget(
   const char* name, const char* message,

Source/cmGlobalGenerator.h

@@ -123,6 +123,7 @@ public:
   void AddLocalGenerator(cmLocalGenerator *lg);
 
   void AddInstallComponent(const char* component);
+  void EnableInstallTarget();
   
   static int s_TryCompileTimeout;
   
@@ -221,6 +222,7 @@ protected:
 
   // Set of named installation components requested by the project.
   std::set<cmStdString> InstallComponents;
+  bool InstallTargetEnabled;
 
   // Manifest of all targets that will be built for each configuration.
   // This is computed just before local generators generate.

Source/cmInstallCommand.cxx

@@ -33,6 +33,10 @@ bool cmInstallCommand::InitialPass(std::vector<std::string> const& args)
     return true;
     }
 
+  // Enable the install target.
+  this->Makefile->GetLocalGenerator()
+    ->GetGlobalGenerator()->EnableInstallTarget();
+
   // Switch among the command modes.
   if(args[0] == "SCRIPT")
     {

Source/cmInstallFilesCommand.cxx

@@ -25,6 +25,11 @@ bool cmInstallFilesCommand
     this->SetError("called with incorrect number of arguments");
     return false;
     }
+
+  // Enable the install target.
+  this->Makefile->GetLocalGenerator()
+    ->GetGlobalGenerator()->EnableInstallTarget();
+
   std::vector<std::string> args;
   this->Makefile->ExpandSourceListArguments(argsIn, args, 2);
 

Source/cmInstallProgramsCommand.cxx

@@ -26,6 +26,10 @@ bool cmInstallProgramsCommand
     return false;
     }
 
+  // Enable the install target.
+  this->Makefile->GetLocalGenerator()
+    ->GetGlobalGenerator()->EnableInstallTarget();
+
   // Create an INSTALL_PROGRAMS target specifically for this path.
   this->TargetName = "INSTALL_PROGRAMS_"+args[0];
   cmTarget& target = this->Makefile->GetTargets()[this->TargetName];

Source/cmInstallTargetsCommand.cxx

@@ -26,6 +26,10 @@ bool cmInstallTargetsCommand
     return false;
     }
 
+  // Enable the install target.
+  this->Makefile->GetLocalGenerator()
+    ->GetGlobalGenerator()->EnableInstallTarget();
+
   cmTargets &tgts = this->Makefile->GetTargets();
   std::vector<std::string>::const_iterator s = args.begin();
   ++s;