From 98b40bce3ed3fb6687a34c526730b3adeac653be Mon Sep 17 00:00:00 2001
From: Alfi Maulana <alfi.maulana.f@gmail.com>
Date: Sat, 14 Jan 2023 17:59:14 +0700
Subject: [PATCH] add option in test target to check if it could surpass a
 compiler warning

---
 test/CMakeLists.txt | 5 +++++
 test/test.in        | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 1e108b3..f240946 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -2,6 +2,10 @@ cmake_minimum_required(VERSION 3.0)
 project(test)
 
 option(CHECK_USING_CLANG "check if target is compiled using Clang" OFF)
+option(CHECK_SURPASS_WARNING "check if target could surpass a compiler warning" OFF)
+
+set(CMAKE_C_FLAGS "-Werror -Wunused-variable ${CMAKE_C_FLAGS}")
+set(CMAKE_CXX_FLAGS "-Werror -Wunused-variable ${CMAKE_CXX_FLAGS}")
 
 add_executable(hello_world hello_world.cpp)
 
@@ -13,5 +17,6 @@ foreach(LANG ${LANGS})
     test_${LANG} PRIVATE
     $<$<STREQUAL:"${LANG}","c">:IS_C>
     $<$<BOOL:${CHECK_USING_CLANG}>:CHECK_USING_CLANG>
+    $<$<BOOL:${CHECK_SURPASS_WARNING}>:CHECK_SURPASS_WARNING>
   )
 endforeach()
diff --git a/test/test.in b/test/test.in
index 6a4eb5f..4098a34 100644
--- a/test/test.in
+++ b/test/test.in
@@ -7,6 +7,9 @@
 #endif
 
 int main() {
+#ifdef CHECK_SURPASS_WARNING
+  int unused;
+#endif
 #if defined(CHECK_USING_CLANG) && !defined(__clang__)
   PRINT("compiler is not clang");
   return 1;