2 files changed, 33 insertions, 0 deletions
diff --git a/Source/cmFileCommand.cxx b/Source/cmFileCommand.cxx
index fa2a3e1..73ff5a1 100644
--- a/Source/cmFileCommand.cxx
+++ b/Source/cmFileCommand.cxx
@@ -177,6 +177,9 @@ bool cmFileCommand::InitialPass(std::vector<std::string> const& args,
   if (subCommand == "LOCK") {
     return this->HandleLockCommand(args);
   }
+  if (subCommand == "SIZE") {
+    return this->HandleSizeCommand(args);
+  }
 
   std::string e = "does not recognize sub-command " + subCommand;
   this->SetError(e);
@@ -3606,3 +3609,32 @@ bool cmFileCommand::HandleTimestampCommand(
 
   return true;
 }
+
+bool cmFileCommand::HandleSizeCommand(std::vector<std::string> const& args)
+{
+  if (args.size() != 3) {
+    std::ostringstream e;
+    e << args[0] << " requires a file name and output variable";
+    this->SetError(e.str());
+    return false;
+  }
+
+  unsigned int argsIndex = 1;
+
+  const std::string& filename = args[argsIndex++];
+
+  const std::string& outputVariable = args[argsIndex++];
+
+  if (!cmSystemTools::FileExists(filename, true)) {
+    std::ostringstream e;
+    e << "SIZE requested of path that is not readable " << filename;
+    this->SetError(e.str());
+    return false;
+  }
+
+  this->Makefile->AddDefinition(
+    outputVariable,
+    std::to_string(cmSystemTools::FileLength(filename)).c_str());
+
+  return true;
+}
diff --git a/Source/cmFileCommand.h b/Source/cmFileCommand.h
index 719dca2..01e007d 100644
--- a/Source/cmFileCommand.h
+++ b/Source/cmFileCommand.h
@@ -59,6 +59,7 @@ protected:
   bool HandleTimestampCommand(std::vector<std::string> const& args);
   bool HandleGenerateCommand(std::vector<std::string> const& args);
   bool HandleLockCommand(std::vector<std::string> const& args);
+  bool HandleSizeCommand(std::vector<std::string> const& args);
 
 private:
   void AddEvaluationFile(const std::string& inputName,