From 92d827c1e9e2a18a6aa8c78bc3d98496949aab18 Mon Sep 17 00:00:00 2001
From: Alexander Shaduri <ashaduri@gmail.com>
Date: Wed, 17 Mar 2021 14:49:53 +0400
Subject: [PATCH] When used as subproject, treat Catch2 cmake target include
 paths as SYSTEM to avoid compiler warnings in Catch2 headers.

---
 src/CMakeLists.txt | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 2f3dd4ab..20644472 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -271,11 +271,20 @@ target_compile_features(Catch2
     cxx_variadic_macros
 )
 
-target_include_directories(Catch2
-  PUBLIC
-    $<BUILD_INTERFACE:${SOURCES_DIR}/..>
-    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
-)
+
+if (NOT_SUBPROJECT)
+    target_include_directories(Catch2
+      PUBLIC
+        $<BUILD_INTERFACE:${SOURCES_DIR}/..>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+    )
+else()
+    target_include_directories(Catch2
+      SYSTEM PUBLIC
+        $<BUILD_INTERFACE:${SOURCES_DIR}/..>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+    )
+endif()
 
 
 add_library(Catch2WithMain STATIC