ENH: Created method cmTarget::GetExportMacro to centralize computation of the export symbol name. This removes duplicate code from all the generators. Also enabled the export definition for executable targets with the ENABLE_EXPORTS property set.

Source/cmGlobalXCodeGenerator.cxx

@@ -1067,21 +1067,11 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
 {
   std::string flags;
   std::string defFlags;
-  bool shared = ((target.GetType() == cmTarget::SHARED_LIBRARY) ||
-                 (target.GetType() == cmTarget::MODULE_LIBRARY));
-  if(shared)
+  // Add the export symbol definition for shared library objects.
+  if(const char* exportMacro = target.GetExportMacro())
     {
     defFlags += "-D";
-    if(const char* custom_export_name = target.GetProperty("DEFINE_SYMBOL"))
-      {
-      defFlags += custom_export_name;
-      }
-    else
-      {
-      std::string in = target.GetName();
-      in += "_EXPORTS";
-      defFlags += cmSystemTools::MakeCindentifier(in.c_str());
-      }
+    defFlags += exportMacro;
     }
   const char* lang = target.GetLinkerLanguage(this);
   std::string cflags;

Source/cmLocalVisualStudio6Generator.cxx

@@ -1289,18 +1289,13 @@ void cmLocalVisualStudio6Generator
       staticLibOptions = libflags;
       }
     }
+
+  // Add the export symbol definition for shared library objects.
   std::string exportSymbol;
-  if (const char* custom_export_name = target.GetProperty("DEFINE_SYMBOL"))
+  if(const char* exportMacro = target.GetExportMacro())
     {
-    exportSymbol = custom_export_name;
+    exportSymbol = exportMacro;
     }
-  else
-    {
-    std::string in = libName;
-    in += "_EXPORTS";
-    exportSymbol = cmSystemTools::MakeCindentifier(in.c_str());
-    }
-
 
   std::string line;
   while(cmSystemTools::GetLineFromStream(fin, line))

Source/cmLocalVisualStudio7Generator.cxx

@@ -520,22 +520,10 @@ void cmLocalVisualStudio7Generator::WriteConfiguration(std::ostream& fout,
   configDefine += "\\\"";
   targetOptions.AddDefine(configDefine);
 
-  // Add a definition for the export macro.
-  if(target.GetType() == cmTarget::SHARED_LIBRARY ||
-     target.GetType() == cmTarget::MODULE_LIBRARY)
+  // Add the export symbol definition for shared library objects.
+  if(const char* exportMacro = target.GetExportMacro())
     {
-    std::string exportSymbol;
-    if(const char* custom_export_name = target.GetProperty("DEFINE_SYMBOL"))
-      {
-      exportSymbol = custom_export_name;
-      }
-    else
-      {
-      std::string id = libName;
-      id += "_EXPORTS";
-      exportSymbol = cmSystemTools::MakeCindentifier(id.c_str());
-      }
-    targetOptions.AddDefine(exportSymbol);
+    targetOptions.AddDefine(exportMacro);
     }
 
   // The intermediate directory name consists of a directory for the

Source/cmMakefileTargetGenerator.cxx

@@ -243,23 +243,14 @@ void cmMakefileTargetGenerator::WriteTargetLanguageFlags()
     {
     const char *lang = l->first.c_str();
     std::string flags;
-    // Add the export symbol definition for shared library objects.
     bool shared = ((this->Target->GetType() == cmTarget::SHARED_LIBRARY) ||
                    (this->Target->GetType() == cmTarget::MODULE_LIBRARY));
-    if(shared)
+
+    // Add the export symbol definition for shared library objects.
+    if(const char* exportMacro = this->Target->GetExportMacro())
       {
       flags += "-D";
-      if(const char* custom_export_name =
-         this->Target->GetProperty("DEFINE_SYMBOL"))
-        {
-        flags += custom_export_name;
-        }
-      else
-        {
-        std::string in = this->Target->GetName();
-        in += "_EXPORTS";
-        flags += cmSystemTools::MakeCindentifier(in.c_str());
-        }
+      flags += exportMacro;
       }
 
     // Add language-specific flags.

Source/cmTarget.cxx

@@ -2157,3 +2157,30 @@ const char* cmTarget::GetOutputDir(bool implib)
 
   return out.c_str();
 }
+
+//----------------------------------------------------------------------------
+const char* cmTarget::GetExportMacro()
+{
+  // Define the symbol for targets that export symbols.
+  if(this->GetType() == cmTarget::SHARED_LIBRARY ||
+     this->GetType() == cmTarget::MODULE_LIBRARY ||
+     this->GetType() == cmTarget::EXECUTABLE &&
+     this->GetPropertyAsBool("ENABLE_EXPORTS"))
+    {
+    if(const char* custom_export_name = this->GetProperty("DEFINE_SYMBOL"))
+      {
+      this->ExportMacro = custom_export_name;
+      }
+    else
+      {
+      std::string in = this->GetName();
+      in += "_EXPORTS";
+      this->ExportMacro = cmSystemTools::MakeCindentifier(in.c_str());
+      }
+    return this->ExportMacro.c_str();
+    }
+  else
+    {
+    return 0;
+    }
+}

Source/cmTarget.h

@@ -259,6 +259,10 @@ public:
   // Compute the OBJECT_FILES property only when requested
   void ComputeObjectFiles();
 
+  /** Get the macro to define when building sources in this target.
+      If no macro should be defined null is returned.  */
+  const char* GetExportMacro();
+
 private:
   /**
    * A list of direct dependencies. Use in conjunction with DependencyMap.
@@ -359,6 +363,7 @@ private:
   std::string OutputDirImplib;
   std::string Directory;
   std::string Location;
+  std::string ExportMacro;
   std::set<cmStdString> Utilities;
   bool RecordDependencies; 
   cmPropertyMap Properties;