From 6d4f8ac3901a4a46efd5f4c80b5cdaece4803085 Mon Sep 17 00:00:00 2001
From: Matthias Maier <tamiko@43-1.org>
Date: Thu, 2 Mar 2023 07:41:13 -0600
Subject: [PATCH] CMake: Bugfix: include bundled include files with -isystem

---
 cmake/macros/macro_populate_target_properties.cmake | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/cmake/macros/macro_populate_target_properties.cmake b/cmake/macros/macro_populate_target_properties.cmake
index 83b0f6688c..0a56dc2944 100644
--- a/cmake/macros/macro_populate_target_properties.cmake
+++ b/cmake/macros/macro_populate_target_properties.cmake
@@ -53,7 +53,7 @@ function(populate_target_properties _target _build)
 
   target_link_libraries(${_target} ${_visibility}
     ${DEAL_II_LIBRARIES} ${DEAL_II_LIBRARIES_${_build}}
-   ${DEAL_II_TARGETS} ${DEAL_II_TARGETS_${_build}}
+    ${DEAL_II_TARGETS} ${DEAL_II_TARGETS_${_build}}
     )
 
   #
@@ -68,6 +68,8 @@ function(populate_target_properties _target _build)
   target_include_directories(${_target} PRIVATE
     ${CMAKE_BINARY_DIR}/include
     ${CMAKE_SOURCE_DIR}/include
+    )
+  target_include_directories(${_target} SYSTEM PRIVATE
     ${DEAL_II_BUNDLED_INCLUDE_DIRS}
     )
 
@@ -85,7 +87,7 @@ function(populate_target_properties _target _build)
     if(NOT "${DEAL_II_BUNDLED_INCLUDE_DIRS}" STREQUAL "")
       list(APPEND _includes "$<INSTALL_INTERFACE:\${DEAL_II_INCLUDE_RELDIR}/deal.II/bundled>")
     endif()
-    target_include_directories(${_target} INTERFACE ${_includes})
+    target_include_directories(${_target} SYSTEM INTERFACE ${_includes})
   endif()
 
   target_compile_definitions(${_target} ${_visibility}
-- 
2.39.5