cmake: fix building on windows with mingw64

- wpcap/packet libraries were wrong (.a, not .lib; not the x64 ones)
- link order resulted in undefined references

Signed-off-by: Simon Goldschmidt <goldsimon@gmx.de>

contrib/ports/win32/Filelists.cmake

@@ -24,8 +24,20 @@ if(NOT DEFINED WPDPACK_DIR)
     set(WPDPACK_DIR ${LWIP_DIR}/../WpdPack)
     message(STATUS "WPDPACK_DIR not set - using default location ${WPDPACK_DIR}")
 endif()
-find_library(WPCAP  wpcap  HINTS ${WPDPACK_DIR}/lib)
-find_library(PACKET packet HINTS ${WPDPACK_DIR}/lib)
+if (${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
+    if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+        set(WPDPACK_LIB_DIR ${WPDPACK_DIR}/lib/x64)
+    else()
+        set(WPDPACK_LIB_DIR ${WPDPACK_DIR}/lib)
+    endif()
+    set(WPCAP  ${WPDPACK_DIR}/lib/x64/wpcap.lib)
+    set(PACKET ${WPDPACK_DIR}/lib/x64/packet.lib)
+else()
+    find_library(WPCAP  wpcap  HINTS ${WPDPACK_DIR}/lib/x64)
+    find_library(PACKET packet HINTS ${WPDPACK_DIR}/lib/x64)
+endif()
+message(STATUS "WPCAP library: ${WPCAP}")
+message(STATUS "PACKET library: ${PACKET}")
 
 add_library(lwipcontribportwindows EXCLUDE_FROM_ALL ${lwipcontribportwindows_SRCS})
 target_include_directories(lwipcontribportwindows PRIVATE ${LWIP_INCLUDE_DIRS} "${WPDPACK_DIR}/include" ${LWIP_MBEDTLS_INCLUDE_DIRS})

contrib/ports/win32/example_app/CMakeLists.txt

@@ -15,7 +15,7 @@ add_executable(example_app ${LWIP_DIR}/contrib/examples/example_app/test.c defau
 target_include_directories(example_app PRIVATE ${LWIP_INCLUDE_DIRS})
 target_compile_options(example_app PRIVATE ${LWIP_COMPILER_FLAGS})
 target_compile_definitions(example_app PRIVATE ${LWIP_DEFINITIONS} ${LWIP_MBEDTLS_DEFINITIONS})
-target_link_libraries(example_app ${LWIP_SANITIZER_LIBS} lwipcontribexamples lwipcontribapps lwipcontribaddons lwipallapps lwipcore lwipcontribportwindows lwipmbedtls)
+target_link_libraries(example_app ${LWIP_SANITIZER_LIBS} lwipallapps lwipcontribexamples lwipcontribapps lwipcontribaddons lwipcontribportwindows lwipcore lwipmbedtls)
 
 add_executable(makefsdata ${lwipmakefsdata_SRCS})
 target_compile_options(makefsdata PRIVATE ${LWIP_COMPILER_FLAGS})