cmTarget: Create helper method for versioned library names

Replace the duplicate logic for the realName and soName of versioned
shared libraries with calls to a new ComputeVersionedName method.

Source/cmTarget.cxx

@@ -131,6 +131,7 @@ cmTarget::cmTarget()
   this->LinkLibrariesAnalyzed = false;
   this->HaveInstallRule = false;
   this->DLLPlatform = false;
+  this->IsApple = false;
   this->IsImportedTarget = false;
 }
 
@@ -1207,6 +1208,9 @@ void cmTarget::SetMakefile(cmMakefile* mf)
                        this->Makefile->IsOn("CYGWIN") ||
                        this->Makefile->IsOn("MINGW"));
 
+  // Check whether we are targeting an Apple platform.
+  this->IsApple = this->Makefile->IsOn("APPLE");
+
   // Setup default property values.
   this->SetPropertyDefault("INSTALL_NAME_DIR", "");
   this->SetPropertyDefault("INSTALL_RPATH", "");
@@ -3348,7 +3352,11 @@ void cmTarget::GetLibraryNames(std::string& name,
     // the library version as the soversion.
     soversion = version;
     }
-  bool isApple = this->Makefile->IsOn("APPLE");
+  if(!version && soversion)
+    {
+    // Use the soversion as the library version.
+    version = soversion;
+    }
 
   // Get the components of the library name.
   std::string prefix;
@@ -3360,47 +3368,12 @@ void cmTarget::GetLibraryNames(std::string& name,
   name = prefix+base+suffix;
 
   // The library's soname.
-  if(isApple)
+  this->ComputeVersionedName(soName, prefix, base, suffix,
-    {
+                             name, soversion);
-    soName = prefix+base;
-    }
-  else
-    {
-    soName = name;
-    }
-  if(soversion)
-    {
-    soName += ".";
-    soName += soversion;
-    }
-  if(isApple)
-    {
-    soName += suffix;
-    }
 
   // The library's real name on disk.
-  if(isApple)
+  this->ComputeVersionedName(realName, prefix, base, suffix,
-    {
+                             name, version);
-    realName = prefix+base;
-    }
-  else
-    {
-  realName = name;
-    }
-  if(version)
-    {
-    realName += ".";
-    realName += version;
-    }
-  else if(soversion)
-    {
-    realName += ".";
-    realName += soversion;
-    }
-  if(isApple)
-    {
-    realName += suffix;
-    }
 
   // The import library name.
   if(this->GetType() == cmTarget::SHARED_LIBRARY ||
@@ -3417,6 +3390,23 @@ void cmTarget::GetLibraryNames(std::string& name,
   pdbName = prefix+base+".pdb";
 }
 
+//----------------------------------------------------------------------------
+void cmTarget::ComputeVersionedName(std::string& vName,
+                                    std::string const& prefix,
+                                    std::string const& base,
+                                    std::string const& suffix,
+                                    std::string const& name,
+                                    const char* version)
+{
+  vName = this->IsApple? (prefix+base) : name;
+  if(version)
+    {
+    vName += ".";
+    vName += version;
+    }
+  vName += this->IsApple? suffix : std::string();
+}
+
 //----------------------------------------------------------------------------
 void cmTarget::GetExecutableNames(std::string& name,
                                   std::string& realName,

Source/cmTarget.h

@@ -557,6 +557,7 @@ private:
   cmPropertyMap Properties;
   LinkLibraryVectorType OriginalLinkLibraries;
   bool DLLPlatform;
+  bool IsApple;
   bool IsImportedTarget;
 
   // Cache target output paths for each configuration.
@@ -595,6 +596,12 @@ private:
   cmTargetInternalPointer Internal;
 
   void ConstructSourceFileFlags();
+  void ComputeVersionedName(std::string& vName,
+                            std::string const& prefix,
+                            std::string const& base,
+                            std::string const& suffix,
+                            std::string const& name,
+                            const char* version);
 };
 
 typedef std::map<cmStdString,cmTarget> cmTargets;