CPack: Try harder to remove temporary dir (#10793)

Windows filesystems sometimes lock files temporarily.  Try removing the
CPack temp install folder multiple times before giving up.

Source/CPack/cmCPackGenerator.cxx

@@ -789,7 +789,7 @@ int cmCPackGenerator::DoPackage()
       cmCPackLogger(cmCPackLog::LOG_VERBOSE, 
                     "Remove toplevel directory: "
         << toplevelDirectory << std::endl);
-      if ( !cmSystemTools::RemoveADirectory(toplevelDirectory) )
+      if ( !cmSystemTools::RepeatedRemoveDirectory(toplevelDirectory) )
         {
         cmCPackLogger(cmCPackLog::LOG_ERROR,
           "Problem removing toplevel directory: "
@@ -1084,7 +1084,7 @@ int cmCPackGenerator::CleanTemporaryDirectory()
     cmCPackLogger(cmCPackLog::LOG_OUTPUT,
                   "- Clean temporary : "
                   << tempInstallDirectory << std::endl);
-    if(!cmsys::SystemTools::RemoveADirectory(tempInstallDirectory))
+    if(!cmSystemTools::RepeatedRemoveDirectory(tempInstallDirectory))
       {
       cmCPackLogger(cmCPackLog::LOG_ERROR,
                     "Problem removing temporary directory: " <<

Source/cmSystemTools.cxx

@@ -2938,3 +2938,18 @@ bool cmSystemTools::CheckRPath(std::string const& file,
   return false;
 #endif
 }
+
+//----------------------------------------------------------------------------
+bool cmSystemTools::RepeatedRemoveDirectory(const char* dir)
+{
+  // Windows sometimes locks files temporarily so try a few times.
+  for(int i = 0; i < 10; ++i)
+    {
+    if(cmSystemTools::RemoveADirectory(dir))
+      {
+      return true;
+      }
+    cmSystemTools::Delay(100);
+    }
+  return false;
+}

Source/cmSystemTools.h

@@ -436,6 +436,9 @@ public:
   static bool CheckRPath(std::string const& file,
                          std::string const& newRPath);
 
+  /** Remove a directory; repeat a few times in case of locked files.  */
+  static bool RepeatedRemoveDirectory(const char* dir);
+
 private:
   static bool s_ForceUnixPaths;
   static bool s_RunCommandHideConsole;