From 1615d1b12a9bfd4a99662b96ccaa5a5bcf8936ef Mon Sep 17 00:00:00 2001
From: Alfi Maulana <alfi.maulana.f@gmail.com>
Date: Wed, 11 Jan 2023 21:07:29 +0700
Subject: [PATCH] add option to check if using clang for `test_c` and
 `test_cpp` targets

---
 test/CMakeLists.txt | 5 +++++
 test/test.c         | 4 ++++
 test/test.cpp       | 4 ++++
 3 files changed, 13 insertions(+)

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 617b4f1..a166a0c 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -4,6 +4,8 @@ project(test)
 option(BUILD_C "build hello world in C Language" OFF)
 option(BUILD_CXX "build hello world in CXX Language" ON)
 
+option(CHECK_USING_CLANG "check if target is compiled using Clang" OFF)
+
 if(BUILD_C)
   add_executable(hello_world_c hello_world.c)
 endif()
@@ -13,4 +15,7 @@ if(BUILD_CXX)
 endif()
 
 add_executable(test_c EXCLUDE_FROM_ALL test.c)
+target_compile_definitions(test_c PRIVATE $<$<BOOL:${CHECK_USING_CLANG}>:CHECK_USING_CLANG>)
+
 add_executable(test_cpp EXCLUDE_FROM_ALL test.cpp)
+target_compile_definitions(test_cpp PRIVATE $<$<BOOL:${CHECK_USING_CLANG}>:CHECK_USING_CLANG>)
diff --git a/test/test.c b/test/test.c
index e9a0a23..325c6c7 100644
--- a/test/test.c
+++ b/test/test.c
@@ -1,6 +1,10 @@
 #include <stdio.h>
 
 int main() {
+#if defined(CHECK_USING_CLANG) && !defined(__clang__)
+  printf("compiler is not clang\n");
+  return 1;
+#endif
   printf("all ok\n");
   return 0;
 }
diff --git a/test/test.cpp b/test/test.cpp
index c36cbb6..b3c6941 100644
--- a/test/test.cpp
+++ b/test/test.cpp
@@ -1,6 +1,10 @@
 #include <iostream>
 
 int main() {
+#if defined(CHECK_USING_CLANG) && !defined(__clang__)
+  std::cout << "compiler is not clang" << std::endl;
+  return 1;
+#endif
   std::cout << "all ok" << std::endl;
   return 0;
 }