From 5cb036564c986fcc45eb16dd0174b1602ceb4f7f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=98ystein=20Myrmo?= <oystein.myrmo@gmail.com>
Date: Tue, 22 Mar 2022 14:32:14 +0100
Subject: [PATCH] Make Clang compile cpp11_test.cpp without warnings

Warnings about unused variables are quenched by simply incrementing the
variables in question. This makes the try_compile() call in CMake
succeed without warnings when checking for C++11 compatibility and using
-Wall.
---
 dlib/cmake_utils/test_for_cpp11/cpp11_test.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dlib/cmake_utils/test_for_cpp11/cpp11_test.cpp b/dlib/cmake_utils/test_for_cpp11/cpp11_test.cpp
index 6cc4f479b..59ca7e8e1 100644
--- a/dlib/cmake_utils/test_for_cpp11/cpp11_test.cpp
+++ b/dlib/cmake_utils/test_for_cpp11/cpp11_test.cpp
@@ -26,8 +26,10 @@ public:
     {
         thread_local int stuff1 = 999;
         auto x = 4;
+        ++stuff1;
 
         decltype(x) asdf = 9;
+        ++asdf;
 
         auto f = []() { cout << "in a lambda!" << endl; };
         f();