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From b95dbaf914618cccaeaa95c650e02be669e477f8 Mon Sep 17 00:00:00 2001
From: James Le Cuirot <chewi@gentoo.org>
Date: Sat, 1 Jul 2023 13:36:48 +0100
Subject: [PATCH] Ensure local headers are used over system headers to avoid
 breakage

types.h was being picked up from webp rather than locally due to the
`include_directories` call for GTK (and therefore its -I arguments)
coming before the same call for the local sources. webp can be pulled in
via GTK -> gdk-pixbuf -> tiff -> webp.

This can be avoided by specifying `SYSTEM` or `BEFORE` as appropriate
when calling `include_directories`. I have done both for good measure.
---
 src/CMakeLists.txt          | 18 ++++++++++--------
 tools/zipdir/CMakeLists.txt |  2 +-
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index cf254ad6a..b4d06f9ce 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -97,7 +97,7 @@ else()
 				if( NOT DYN_GTK )
 					set( PROJECT_LIBRARIES ${PROJECT_LIBRARIES} ${GTK3_LIBRARIES} )
 				endif()
-				include_directories( ${GTK3_INCLUDE_DIRS} )
+				include_directories( SYSTEM ${GTK3_INCLUDE_DIRS} )
 				link_directories( ${GTK3_LIBRARY_DIRS} )
 			else()
 				pkg_check_modules( GTK2 gtk+-2.0 )
@@ -105,7 +105,7 @@ else()
 					if( NOT DYN_GTK )
 						set( PROJECT_LIBRARIES ${PROJECT_LIBRARIES} ${GTK2_LIBRARIES} )
 					endif()
-					include_directories( ${GTK2_INCLUDE_DIRS} )
+					include_directories( SYSTEM ${GTK2_INCLUDE_DIRS} )
 					link_directories( ${GTK2_LIBRARY_DIRS} )
 				else()
 					set( NO_GTK ON )
@@ -132,7 +132,7 @@ else()
 	# Non-Windows version also needs SDL except native OS X backend
 	if( NOT APPLE OR NOT OSX_COCOA_BACKEND )
 		find_package( SDL2 REQUIRED )
-		include_directories( "${SDL2_INCLUDE_DIR}" )
+		include_directories( SYSTEM "${SDL2_INCLUDE_DIR}" )
 		set( PROJECT_LIBRARIES ${PROJECT_LIBRARIES} "${SDL2_LIBRARY}" )
 	endif()
 
@@ -143,7 +143,7 @@ if( NOT NO_OPENAL )
 		find_package( OpenAL )
 		mark_as_advanced(CLEAR OPENAL_INCLUDE_DIR)
 		if( OPENAL_INCLUDE_DIR )
-			include_directories( ${OPENAL_INCLUDE_DIR} )
+			include_directories( SYSTEM ${OPENAL_INCLUDE_DIR} )
 			mark_as_advanced(CLEAR OPENAL_LIBRARY)
 			if( OPENAL_LIBRARY )
 				set( PROJECT_LIBRARIES ${OPENAL_LIBRARY} ${PROJECT_LIBRARIES} )
@@ -373,17 +373,17 @@ endif()
 
 if( VPX_FOUND )
 	add_definitions( "-DUSE_LIBVPX=1" )
-	include_directories( "${VPX_INCLUDE_DIR}" )
+	include_directories( SYSTEM "${VPX_INCLUDE_DIR}" )
 	set( PROJECT_LIBRARIES ${PROJECT_LIBRARIES} ${VPX_LIBRARIES} )
 else()
 	message( SEND_ERROR "Could not find libvpx" )
 endif()
 
-include_directories( "${ZLIB_INCLUDE_DIR}" "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIR}" "${JPEG_INCLUDE_DIR}" "${ZMUSIC_INCLUDE_DIR}" "${DRPC_INCLUDE_DIR}")
+include_directories( SYSTEM "${ZLIB_INCLUDE_DIR}" "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIR}" "${JPEG_INCLUDE_DIR}" "${ZMUSIC_INCLUDE_DIR}" "${DRPC_INCLUDE_DIR}")
 
 if( ${HAVE_VM_JIT} )
 	add_definitions( -DHAVE_VM_JIT )
-	include_directories( "${ASMJIT_INCLUDE_DIR}" )
+	include_directories( SYSTEM "${ASMJIT_INCLUDE_DIR}" )
 	set( PROJECT_LIBRARIES ${PROJECT_LIBRARIES} "${ASMJIT_LIBRARIES}")
 endif()
 
@@ -1243,7 +1243,9 @@ endif()
 
 target_link_libraries( zdoom ${PROJECT_LIBRARIES} gdtoa lzma ${ZMUSIC_LIBRARIES} )
 
-include_directories( .
+include_directories(
+	BEFORE
+	.
 	common/audio/sound
 	common/audio/music
 	common/2d
diff --git a/tools/zipdir/CMakeLists.txt b/tools/zipdir/CMakeLists.txt
index 65eb2fb72..762d9027f 100644
--- a/tools/zipdir/CMakeLists.txt
+++ b/tools/zipdir/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required( VERSION 3.1.0 )
 
 if( NOT CMAKE_CROSSCOMPILING )
-	include_directories( "${ZLIB_INCLUDE_DIR}" "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIR}" )
+	include_directories( SYSTEM "${ZLIB_INCLUDE_DIR}" "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIR}" )
 	add_executable( zipdir
 		zipdir.c )
 	target_link_libraries( zipdir ${ZLIB_LIBRARIES} ${BZIP2_LIBRARIES} lzma )
-- 
2.41.0