Give lwIP a top-level CMakeLists.txt

(as it is common in other projects)
This breaks iteropts.sh for now

contrib/ports/CMakeCommon.cmake

@@ -13,12 +13,12 @@ if(EXISTS ${MBEDTLSDIR}/CMakeLists.txt)
     # Prevent building MBEDTLS programs and tests
     set(ENABLE_PROGRAMS OFF CACHE BOOL "")
     set(ENABLE_TESTING  OFF CACHE BOOL "")
-    
+
     # mbedtls uses cmake. Sweet!
     add_subdirectory(${MBEDTLSDIR} mbedtls)
 
     set (LWIP_MBEDTLS_DEFINITIONS
-        -DLWIP_HAVE_MBEDTLS=1
+        LWIP_HAVE_MBEDTLS=1
     )
     set (LWIP_MBEDTLS_INCLUDE_DIRS
         ${MBEDTLSDIR}/include

contrib/ports/unix/example_app/CMakeLists.txt

@@ -1,13 +1,3 @@
-cmake_minimum_required(VERSION 3.8)
-
-project(example_app C)
-
-set (CMAKE_EXPORT_COMPILE_COMMANDS ON)
-
-set(LWIP_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../..)
-include(${LWIP_DIR}/contrib/ports/CMakeCommon.cmake)
-
-set (LWIP_DEFINITIONS -DLWIP_DEBUG)
 set (LWIP_INCLUDE_DIRS
     "${LWIP_DIR}/src/include"
     "${LWIP_CONTRIB_DIR}/"
@@ -28,4 +18,4 @@ target_link_libraries(example_app ${LWIP_SANITIZER_LIBS} lwipcontribexamples lwi
 add_executable(makefsdata ${lwipmakefsdata_SRCS})
 target_compile_options(makefsdata PRIVATE ${LWIP_COMPILER_FLAGS})
 target_include_directories(makefsdata PRIVATE ${LWIP_INCLUDE_DIRS})
-target_link_libraries(makefsdata ${LWIP_SANITIZER_LIBS})
+target_link_libraries(makefsdata ${LWIP_SANITIZER_LIBS})

contrib/ports/win32/example_app/CMakeLists.txt

@@ -1,13 +1,3 @@
-cmake_minimum_required(VERSION 3.8)
-
-project(example_app C)
-
-set (CMAKE_EXPORT_COMPILE_COMMANDS ON)
-
-set(LWIP_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../..)
-include(${LWIP_DIR}/contrib/ports/CMakeCommon.cmake)
-
-set (LWIP_DEFINITIONS -DLWIP_DEBUG)
 set (LWIP_INCLUDE_DIRS
     "${LWIP_DIR}/src/include"
     "${LWIP_CONTRIB_DIR}/"