initial doc for C6030

Author: Rastaban

docs/code-quality/c6030.md

@@ -0,0 +1,40 @@
+---
+title: Warning C6030
+description: "Describes C++ Code Analysis warning C6030 and how to resolve it."
+ms.date: 03/10/2023
+f1_keywords: ["C6030", "USE_ATTRIBUTE_NORETURN", "__WARNING_USE_ATTRIBUTE_NORETURN"]
+helpviewer_keywords: ["C6030"]
+---
+
+# Warning  C6030
+
+> Use attribute [[noreturn]] over __declspec(noreturn) in function '*function-name*'
+
+## Remarks
+
+This warning suggests using the C++11 standard attribute `[[noreturn]]` in place of the declspec variant `__declspec(noreturn)`. The standard attribute provides better cross platform support because it does not rely on language extensions.
+
+This warning helps with code modernization.  It is off by default and is not part of the `All Rules` rule set. To enable this warning it must be added to the rule set file being used.
+
+This check is available in Visual Studio 2022 version 17.0 and later versions.
+Code analysis name: USE_ATTRIBUTE_NORETURN
+
+## Example
+
+The following code generates C6030:
+
+```cpp
+__declspec(noreturn) void TerminateApplication();
+
+```
+
+Fix the issue by using the `[[noreturn]]` attribute:
+
+```cpp
+[[ noreturn ]] void TerminateApplication();
+
+```
+
+## See also
+
+[Use Rule Sets to Specify the C++ Rules to Run](./using-rule-sets-to-specify-the-cpp-rules-to-run.md)