improve cross compiling behavior

docker/linux/build.sh

@@ -4,7 +4,7 @@ EXTRA_CMAKE_FLAGS=
 
 if [ "$ARCH" = "aarch64" ]
 then
-    EXTRA_CMAKE_FLAGS="-DCMAKE_CROSSCOMPILING=ON -DCMAKE_SYSTEM_PROCESSOR=aarch64 -DCMAKE_SYSTEM_NAME=Linux -DCMAKE_CROSS_PREFIX=aarch64-linux-gnu-"
+    EXTRA_CMAKE_FLAGS="-DCMAKE_CROSSCOMPILING=ON -DCMAKE_SYSTEM_PROCESSOR=aarch64 -DCMAKE_SYSTEM_NAME=Linux"
     export PKG_CONFIG_PATH=/usr/lib/aarch64-linux-gnu/pkgconfig
     export PATH=$PATH:/usr/lib/aarch64-linux-gnu
     export CC=aarch64-linux-gnu-gcc

pipe/linux/CMakeLists.txt

@@ -28,7 +28,7 @@ if (VANILLA_BUILD_VENDORED)
 		BINARY_DIR ${OPENSSL_DIR}
 		GIT_REPOSITORY https://github.com/openssl/openssl.git
 		GIT_TAG openssl-3.5.0
-		CONFIGURE_COMMAND ./Configure --prefix=${OPENSSL_INSTALL_DIR} linux-${OPENSSL_PROCESSOR}
+		CONFIGURE_COMMAND env CC=${CMAKE_C_COMPILER} ./Configure --prefix=${OPENSSL_INSTALL_DIR} linux-${OPENSSL_PROCESSOR} no-apps no-docs  no-quic no-http
 		UPDATE_COMMAND ""
 		# BUILD_BYPRODUCTS
 		# 	${WPA_SUPPLICANT_BYPRODUCTS}
@@ -163,12 +163,21 @@ foreach(_wpa_supplicant_obj ${WPA_SUPPLICANT_OBJECTS})
     list(APPEND WPA_SUPPLICANT_BYPRODUCTS "${_wpa_supplicant_obj_path}")
 endforeach()
 
+set(HOSTAP_ENV
+	CC=${CMAKE_C_COMPILER}
+)
+if (VANILLA_BUILD_VENDORED)
+	list(APPEND HOSTAP_ENV
+		PKG_CONFIG_PATH=${LIBNL_INSTALL_DIR}/lib/pkgconfig
+		CFLAGS="-I${LIBNL_INSTALL_DIR}/include/libnl3"
+	)
+endif()
 ExternalProject_Add(hostap
     SOURCE_DIR ${HOSTAP_DIR}
     BINARY_DIR ${HOSTAP_DIR}
     GIT_REPOSITORY https://github.com/rolandoislas/drc-hostap.git
     CONFIGURE_COMMAND ${CMAKE_COMMAND} -E copy_if_different conf/wpa_supplicant.config wpa_supplicant/.config
-    BUILD_COMMAND make -C wpa_supplicant -j${CMAKE_BUILD_PARALLEL_LEVEL} wpa_supplicant libwpa_client.a
+    BUILD_COMMAND env ${HOSTAP_ENV} make -C wpa_supplicant -j${CMAKE_BUILD_PARALLEL_LEVEL} wpa_supplicant libwpa_client.a
     INSTALL_COMMAND ""
     UPDATE_COMMAND ""
     BUILD_BYPRODUCTS

pipe/linux/wpa.c

@@ -3,6 +3,7 @@
 #include <arpa/inet.h>
 #include <errno.h>
 #include <libgen.h>
+#include <linux/version.h>
 #include <net/if.h>
 #include <netlink/route/addr.h>
 #include <pthread.h>
@@ -334,8 +335,10 @@ void dhcp_callback(const char *type, char **env, void *data)
         struct nl_msg *msg;
         rtnl_addr_build_add_request(ra, 0, &msg);
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,18,00)
         // Make this route the lowest possible priority so the system doesn't favor it over other connections
         nla_put_u32(msg, IFA_RT_PRIORITY, UINT32_MAX);
+#endif
 
         // Send request
         nl_send_auto_complete(nl, msg);

rpi/CMakeLists.txt

@@ -27,7 +27,8 @@ function(compile_ffmpeg _target_name _system_name _system_processor)
         --enable-decoder=h264
         --enable-encoder=png
     )
-    if (CMAKE_CROSSCOMPILING)
+    if (NOT "${CMAKE_HOST_SYSTEM_PROCESSOR}" STREQUAL "${_system_processor}"
+		OR NOT "${CMAKE_HOST_SYSTEM_NAME}" STREQUAL "${_system_name}")
         set(FFMPEG_TARGET_OS ${_system_name})
         set(FFMPEG_ENV "")
         if (MINGW)
@@ -95,7 +96,7 @@ function(compile_ffmpeg _target_name _system_name _system_processor)
         elseif(LINUX)
             set(FFMPEG_TARGET_OS "linux")
             list(APPEND FFMPEG_CONFIGURE_ARGS
-                --cross-prefix=${CMAKE_CROSS_PREFIX}
+                --cross-prefix=${_system_processor}-linux-gnu-
                 --host-cc=${CMAKE_C_COMPILER}
             )
         endif()