From 9672b4c3af152d99c7ed5bff0a530c9adc79fe8b Mon Sep 17 00:00:00 2001
From: Dirk Ziegelmeier <dirk@ziegelmeier.net>
Date: Mon, 30 Apr 2018 21:35:12 +0200
Subject: [PATCH] Work on CMake build system - restructure to use included
 cmake files, this is more flexible

---
 src/CMakeLists.txt  | 284 --------------------------------------------
 src/Filelists.cmake | 258 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 258 insertions(+), 284 deletions(-)
 delete mode 100644 src/CMakeLists.txt
 create mode 100644 src/Filelists.cmake

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
deleted file mode 100644
index f9c23aaa..00000000
--- a/src/CMakeLists.txt
+++ /dev/null
@@ -1,284 +0,0 @@
-set(LWIP_VERSION_MAJOR    "2")
-set(LWIP_VERSION_MINOR    "0")
-set(LWIP_VERSION_REVISION "3")
-# LWIP_VERSION_RC is set to LWIP_RC_RELEASE for official releases */
-# LWIP_VERSION_RC is set to LWIP_RC_DEVELOPMENT for Git versions */
-set(LWIP_VERSION_RC       "LWIP_RC_DEVELOPMENT")
-
-set(LWIP_VERSION_STRING
-    "${LWIP_VERSION_MAJOR}.${LWIP_VERSION_MINOR}.${LWIP_VERSION_REVISION}"
-)
-
-# The minimum set of files needed for lwIP.
-set(lwipcore_SRCS
-    core/init.c
-    core/def.c
-    core/dns.c
-    core/inet_chksum.c
-    core/ip.c
-    core/mem.c
-    core/memp.c
-    core/netif.c
-    core/pbuf.c
-    core/raw.c
-    core/stats.c
-    core/sys.c
-    core/altcp.c
-    core/altcp_alloc.c
-    core/altcp_tcp.c
-    core/tcp.c
-    core/tcp_in.c
-    core/tcp_out.c
-    core/timeouts.c
-    core/udp.c
-)
-set(lwipcore4_SRCS
-    core/ipv4/autoip.c
-    core/ipv4/dhcp.c
-    core/ipv4/etharp.c
-    core/ipv4/icmp.c
-    core/ipv4/igmp.c
-    core/ipv4/ip4_frag.c
-    core/ipv4/ip4.c
-    core/ipv4/ip4_addr.c
-)
-set(lwipcore6_SRCS
-    core/ipv6/dhcp6.c
-    core/ipv6/ethip6.c
-    core/ipv6/icmp6.c
-    core/ipv6/inet6.c
-    core/ipv6/ip6.c
-    core/ipv6/ip6_addr.c
-    core/ipv6/ip6_frag.c
-    core/ipv6/mld6.c
-    core/ipv6/nd6.c
-)
-
-# APIFILES: The files which implement the sequential and socket APIs.
-set(lwipapi_SRCS
-    api/api_lib.c
-    api/api_msg.c
-    api/err.c
-    api/if_api.c
-    api/netbuf.c
-    api/netdb.c
-    api/netifapi.c
-    api/sockets.c
-    api/tcpip.c
-)
-
-# Files implementing various generic network interface functions
-set(lwipnetif_SRCS
-    netif/ethernet.c
-    netif/bridgeif.c
-    netif/bridgeif_fdb.c
-    netif/slipif.c
-)
-
-# 6LoWPAN
-set(lwipsixlowpan_SRCS
-    netif/lowpan6_common.c
-    netif/lowpan6.c
-    netif/lowpan6_ble.c
-    netif/zepif.c
-)
-
-# PPP
-set(lwipppp_SRCS
-    netif/ppp/auth.c
-    netif/ppp/ccp.c
-    netif/ppp/chap-md5.c
-    netif/ppp/chap_ms.c
-    netif/ppp/chap-new.c
-    netif/ppp/demand.c
-    netif/ppp/eap.c
-    netif/ppp/ecp.c
-    netif/ppp/eui64.c
-    netif/ppp/fsm.c
-    netif/ppp/ipcp.c
-    netif/ppp/ipv6cp.c
-    netif/ppp/lcp.c
-    netif/ppp/magic.c
-    netif/ppp/mppe.c
-    netif/ppp/multilink.c
-    netif/ppp/ppp.c
-    netif/ppp/pppapi.c
-    netif/ppp/pppcrypt.c
-    netif/ppp/pppoe.c
-    netif/ppp/pppol2tp.c
-    netif/ppp/pppos.c
-    netif/ppp/upap.c
-    netif/ppp/utils.c
-    netif/ppp/vj.c
-    netif/ppp/polarssl/arc4.c
-    netif/ppp/polarssl/des.c
-    netif/ppp/polarssl/md4.c
-    netif/ppp/polarssl/md5.c
-    netif/ppp/polarssl/sha1.c
-)
-
-# SNMPv3 agent
-set(lwipsnmp_SRCS
-    apps/snmp/snmp_asn1.c
-    apps/snmp/snmp_core.c
-    apps/snmp/snmp_mib2.c
-    apps/snmp/snmp_mib2_icmp.c
-    apps/snmp/snmp_mib2_interfaces.c
-    apps/snmp/snmp_mib2_ip.c
-    apps/snmp/snmp_mib2_snmp.c
-    apps/snmp/snmp_mib2_system.c
-    apps/snmp/snmp_mib2_tcp.c
-    apps/snmp/snmp_mib2_udp.c
-    apps/snmp/snmp_snmpv2_framework.c
-    apps/snmp/snmp_snmpv2_usm.c
-    apps/snmp/snmp_msg.c
-    apps/snmp/snmpv3.c
-    apps/snmp/snmp_netconn.c
-    apps/snmp/snmp_pbuf_stream.c
-    apps/snmp/snmp_raw.c
-    apps/snmp/snmp_scalar.c
-    apps/snmp/snmp_table.c
-    apps/snmp/snmp_threadsync.c
-    apps/snmp/snmp_traps.c
-)
-
-# HTTP server + client
-set(lwiphttp_SRCS
-    apps/http/altcp_proxyconnect.c
-    apps/http/fs.c
-    apps/http/http_client.c
-    apps/http/httpd.c
-)
-
-# MAKEFSDATA HTTP server host utility
-set(lwipmakefsdata_SRCS
-    apps/http/makefsdata/makefsdata.c
-)
-
-# IPERF server
-set(lwipiperf_SRCS
-    apps/lwiperf/lwiperf.c
-)
-
-# SMTP client
-set(lwipsmtp_SRCS
-    apps/smtp/smtp.c
-)
-
-# SNTP client
-set(lwipsntp_SRCS
-    apps/sntp/sntp.c
-)
-
-# MDNS responder
-set(lwipmdns_SRCS
-    apps/mdns/mdns.c
-)
-
-# NetBIOS name server
-set(lwipnetbios_SRCS
-    apps/netbiosns/netbiosns.c
-)
-
-# TFTP server files
-set(lwiptftp_SRCS
-    apps/tftp/tftp_server.c
-)
-
-# MQTT client files
-set(lwipmqtt_SRCS
-    apps/mqtt/mqtt.c
-)
-
-# ARM MBEDTLS related files of lwIP rep
-set(lwipmbedtls_SRCS
-    apps/altcp_tls/altcp_tls_mbedtls.c
-    apps/altcp_tls/altcp_tls_mbedtls_mem.c
-    apps/snmp/snmpv3_mbedtls.c
-)
-
-# All LWIP files without apps
-set(lwipnoapps_SRCS
-    ${lwipcore_SRCS}
-    ${lwipcore4_SRCS}
-    ${lwipcore6_SRCS}
-    ${lwipapi_SRCS}
-    ${lwipnetif_SRCS}
-    ${lwipsixlowpan_SRCS}
-    ${lwipppp_SRCS}
-)
-
-# LWIPAPPFILES: All LWIP APPs
-set(lwipallapps_SRCS
-    ${lwipsnmp_SRCS}
-    ${lwiphttp_SRCS}
-    ${lwipiperf_SRCS}
-    ${lwipsmtp_SRCS}
-    ${lwipsntp_SRCS}
-    ${lwipmdns_SRCS}
-    ${lwipnetbios_SRCS}
-    ${lwiptftp_SRCS}
-    ${lwipmqtt_SRCS}
-    ${lwipmbedtls_SRCS}
-)
-
-# Generate lwip/init.h (version info)
-configure_file(include/lwip/init.h.cmake.in ${CMAKE_CURRENT_SOURCE_DIR}/include/lwip/init.h)
-
-# Documentation
-set(DOXYGEN_IN  ../doc/doxygen/lwip.Doxyfile.cmake.in)
-set(DOXYGEN_OUT ${CMAKE_CURRENT_SOURCE_DIR}/../doc/doxygen/lwip.Doxyfile)
-configure_file(${DOXYGEN_IN} ${DOXYGEN_OUT})
-
-option(LWIP_BUILD_DOCUMENTATION "Build documentation" OFF)
-if(LWIP_BUILD_DOCUMENTATION)
-    find_package(Doxygen)
-    if (DOXYGEN_FOUND)
-        message("Doxygen build started")
-        # note the option ALL which allows to build the docs together with the application
-        add_custom_target(lwipdocs ALL
-            COMMAND ${DOXYGEN_EXECUTABLE} ${DOXYGEN_OUT}
-            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/../doc/doxygen
-            COMMENT "Generating API documentation with Doxygen"
-            VERBATIM)
-    else (DOXYGEN_FOUND)
-        message("Doxygen needs to be installed to generate the doxygen documentation")
-    endif (DOXYGEN_FOUND)
-endif(LWIP_BUILD_DOCUMENTATION)
-
-# Generate Filelists.mk via cmake
-function(lwip_gen_filelist_entries var_name filelist_var_name)
-    foreach(srcfile ${${filelist_var_name}})
-       set(tmp "${tmp}$(LWIPDIR)/${srcfile} ")
-    endforeach()
-    set(${var_name} "${tmp}" PARENT_SCOPE)
-endfunction(lwip_gen_filelist_entries)
-lwip_gen_filelist_entries("filelist_mk_COREFILES" "lwipcore_SRCS")
-lwip_gen_filelist_entries("filelist_mk_CORE4FILES" "lwipcore4_SRCS")
-lwip_gen_filelist_entries("filelist_mk_CORE6FILES" "lwipcore6_SRCS")
-lwip_gen_filelist_entries("filelist_mk_APIFILES" "lwipapi_SRCS")
-lwip_gen_filelist_entries("filelist_mk_NETIFFILES" "lwipnetif_SRCS")
-lwip_gen_filelist_entries("filelist_mk_SIXLOWPANFILES" "lwipsixlowpan_SRCS")
-lwip_gen_filelist_entries("filelist_mk_PPPFILES" "lwipppp_SRCS")
-lwip_gen_filelist_entries("filelist_mk_SNMPFILES" "lwipsnmp_SRCS")
-lwip_gen_filelist_entries("filelist_mk_HTTPFILES" "lwiphttp_SRCS")
-lwip_gen_filelist_entries("filelist_mk_MKFSDATAFILES" "lwipmakefsdata_SRCS")
-lwip_gen_filelist_entries("filelist_mk_IPERFFILES" "lwipiperf_SRCS")
-lwip_gen_filelist_entries("filelist_mk_SMTPFILES" "lwipsmtp_SRCS")
-lwip_gen_filelist_entries("filelist_mk_SNTPFILES" "lwipsntp_SRCS")
-lwip_gen_filelist_entries("filelist_mk_MDNSFILES" "lwipmdns_SRCS")
-lwip_gen_filelist_entries("filelist_mk_NETBIOSFILES" "lwipnetbios_SRCS")
-lwip_gen_filelist_entries("filelist_mk_TFTPFILES" "lwiptftp_SRCS")
-lwip_gen_filelist_entries("filelist_mk_MQTTFILES" "lwipmqtt_SRCS")
-lwip_gen_filelist_entries("filelist_mk_MBEDTLSFILES" "lwipmbedtls_SRCS")
-configure_file(Filelists.mk.cmake.in ${CMAKE_CURRENT_SOURCE_DIR}/Filelists.mk)
-
-# lwIP libraries
-add_library(lwipcore EXCLUDE_FROM_ALL ${lwipnoapps_SRCS})
-
-add_library(lwipapps EXCLUDE_FROM_ALL ${lwipallapps_SRCS})
-
-# when NOT cross-compiling, build makefsdata
-if (NOT CMAKE_CROSSCOMPILING)
-    add_executable(makefsdata ${lwipmakefsdata_SRCS})
-endif()
diff --git a/src/Filelists.cmake b/src/Filelists.cmake
new file mode 100644
index 00000000..8d875740
--- /dev/null
+++ b/src/Filelists.cmake
@@ -0,0 +1,258 @@
+# This file is indended to be included in end-user CMakeLists.txt
+# include(/path/to/Filelists.cmake)
+# It assumes the variable LWIP_DIR is defined pointing to the
+# root path of lwIP sources.
+#
+# This file is NOT designed (on purpose) to be included as cmake
+# subdir via add_subdirectory()
+# The intention is to provide greater flexibility to users to 
+# create their own targets using the *_SRCS variables.
+
+set(LWIP_VERSION_MAJOR    "2")
+set(LWIP_VERSION_MINOR    "0")
+set(LWIP_VERSION_REVISION "3")
+# LWIP_VERSION_RC is set to LWIP_RC_RELEASE for official releases */
+# LWIP_VERSION_RC is set to LWIP_RC_DEVELOPMENT for Git versions */
+set(LWIP_VERSION_RC       "LWIP_RC_DEVELOPMENT")
+
+set(LWIP_VERSION_STRING
+    "${LWIP_VERSION_MAJOR}.${LWIP_VERSION_MINOR}.${LWIP_VERSION_REVISION}"
+)
+
+# The minimum set of files needed for lwIP.
+set(lwipcore_SRCS
+    ${LWIP_DIR}/src/core/init.c
+    ${LWIP_DIR}/src/core/def.c
+    ${LWIP_DIR}/src/core/dns.c
+    ${LWIP_DIR}/src/core/inet_chksum.c
+    ${LWIP_DIR}/src/core/ip.c
+    ${LWIP_DIR}/src/core/mem.c
+    ${LWIP_DIR}/src/core/memp.c
+    ${LWIP_DIR}/src/core/netif.c
+    ${LWIP_DIR}/src/core/pbuf.c
+    ${LWIP_DIR}/src/core/raw.c
+    ${LWIP_DIR}/src/core/stats.c
+    ${LWIP_DIR}/src/core/sys.c
+    ${LWIP_DIR}/src/core/altcp.c
+    ${LWIP_DIR}/src/core/altcp_alloc.c
+    ${LWIP_DIR}/src/core/altcp_tcp.c
+    ${LWIP_DIR}/src/core/tcp.c
+    ${LWIP_DIR}/src/core/tcp_in.c
+    ${LWIP_DIR}/src/core/tcp_out.c
+    ${LWIP_DIR}/src/core/timeouts.c
+    ${LWIP_DIR}/src/core/udp.c
+)
+set(lwipcore4_SRCS
+    ${LWIP_DIR}/src/core/ipv4/autoip.c
+    ${LWIP_DIR}/src/core/ipv4/dhcp.c
+    ${LWIP_DIR}/src/core/ipv4/etharp.c
+    ${LWIP_DIR}/src/core/ipv4/icmp.c
+    ${LWIP_DIR}/src/core/ipv4/igmp.c
+    ${LWIP_DIR}/src/core/ipv4/ip4_frag.c
+    ${LWIP_DIR}/src/core/ipv4/ip4.c
+    ${LWIP_DIR}/src/core/ipv4/ip4_addr.c
+)
+set(lwipcore6_SRCS
+    ${LWIP_DIR}/src/core/ipv6/dhcp6.c
+    ${LWIP_DIR}/src/core/ipv6/ethip6.c
+    ${LWIP_DIR}/src/core/ipv6/icmp6.c
+    ${LWIP_DIR}/src/core/ipv6/inet6.c
+    ${LWIP_DIR}/src/core/ipv6/ip6.c
+    ${LWIP_DIR}/src/core/ipv6/ip6_addr.c
+    ${LWIP_DIR}/src/core/ipv6/ip6_frag.c
+    ${LWIP_DIR}/src/core/ipv6/mld6.c
+    ${LWIP_DIR}/src/core/ipv6/nd6.c
+)
+
+# APIFILES: The files which implement the sequential and socket APIs.
+set(lwipapi_SRCS
+    ${LWIP_DIR}/src/api/api_lib.c
+    ${LWIP_DIR}/src/api/api_msg.c
+    ${LWIP_DIR}/src/api/err.c
+    ${LWIP_DIR}/src/api/if_api.c
+    ${LWIP_DIR}/src/api/netbuf.c
+    ${LWIP_DIR}/src/api/netdb.c
+    ${LWIP_DIR}/src/api/netifapi.c
+    ${LWIP_DIR}/src/api/sockets.c
+    ${LWIP_DIR}/src/api/tcpip.c
+)
+
+# Files implementing various generic network interface functions
+set(lwipnetif_SRCS
+    ${LWIP_DIR}/src/netif/ethernet.c
+    ${LWIP_DIR}/src/netif/bridgeif.c
+    ${LWIP_DIR}/src/netif/bridgeif_fdb.c
+    ${LWIP_DIR}/src/netif/slipif.c
+)
+
+# 6LoWPAN
+set(lwipsixlowpan_SRCS
+    ${LWIP_DIR}/src/netif/lowpan6_common.c
+    ${LWIP_DIR}/src/netif/lowpan6.c
+    ${LWIP_DIR}/src/netif/lowpan6_ble.c
+    ${LWIP_DIR}/src/netif/zepif.c
+)
+
+# PPP
+set(lwipppp_SRCS
+    ${LWIP_DIR}/src/netif/ppp/auth.c
+    ${LWIP_DIR}/src/netif/ppp/ccp.c
+    ${LWIP_DIR}/src/netif/ppp/chap-md5.c
+    ${LWIP_DIR}/src/netif/ppp/chap_ms.c
+    ${LWIP_DIR}/src/netif/ppp/chap-new.c
+    ${LWIP_DIR}/src/netif/ppp/demand.c
+    ${LWIP_DIR}/src/netif/ppp/eap.c
+    ${LWIP_DIR}/src/netif/ppp/ecp.c
+    ${LWIP_DIR}/src/netif/ppp/eui64.c
+    ${LWIP_DIR}/src/netif/ppp/fsm.c
+    ${LWIP_DIR}/src/netif/ppp/ipcp.c
+    ${LWIP_DIR}/src/netif/ppp/ipv6cp.c
+    ${LWIP_DIR}/src/netif/ppp/lcp.c
+    ${LWIP_DIR}/src/netif/ppp/magic.c
+    ${LWIP_DIR}/src/netif/ppp/mppe.c
+    ${LWIP_DIR}/src/netif/ppp/multilink.c
+    ${LWIP_DIR}/src/netif/ppp/ppp.c
+    ${LWIP_DIR}/src/netif/ppp/pppapi.c
+    ${LWIP_DIR}/src/netif/ppp/pppcrypt.c
+    ${LWIP_DIR}/src/netif/ppp/pppoe.c
+    ${LWIP_DIR}/src/netif/ppp/pppol2tp.c
+    ${LWIP_DIR}/src/netif/ppp/pppos.c
+    ${LWIP_DIR}/src/netif/ppp/upap.c
+    ${LWIP_DIR}/src/netif/ppp/utils.c
+    ${LWIP_DIR}/src/netif/ppp/vj.c
+    ${LWIP_DIR}/src/netif/ppp/polarssl/arc4.c
+    ${LWIP_DIR}/src/netif/ppp/polarssl/des.c
+    ${LWIP_DIR}/src/netif/ppp/polarssl/md4.c
+    ${LWIP_DIR}/src/netif/ppp/polarssl/md5.c
+    ${LWIP_DIR}/src/netif/ppp/polarssl/sha1.c
+)
+
+# SNMPv3 agent
+set(lwipsnmp_SRCS
+    ${LWIP_DIR}/src/apps/snmp/snmp_asn1.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_core.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_mib2.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_mib2_icmp.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_mib2_interfaces.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_mib2_ip.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_mib2_snmp.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_mib2_system.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_mib2_tcp.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_mib2_udp.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_snmpv2_framework.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_snmpv2_usm.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_msg.c
+    ${LWIP_DIR}/src/apps/snmp/snmpv3.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_netconn.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_pbuf_stream.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_raw.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_scalar.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_table.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_threadsync.c
+    ${LWIP_DIR}/src/apps/snmp/snmp_traps.c
+)
+
+# HTTP server + client
+set(lwiphttp_SRCS
+    ${LWIP_DIR}/src/apps/http/altcp_proxyconnect.c
+    ${LWIP_DIR}/src/apps/http/fs.c
+    ${LWIP_DIR}/src/apps/http/http_client.c
+    ${LWIP_DIR}/src/apps/http/httpd.c
+)
+
+# MAKEFSDATA HTTP server host utility
+set(lwipmakefsdata_SRCS
+    ${LWIP_DIR}/src/apps/http/makefsdata/makefsdata.c
+)
+
+# IPERF server
+set(lwipiperf_SRCS
+    ${LWIP_DIR}/src/apps/lwiperf/lwiperf.c
+)
+
+# SMTP client
+set(lwipsmtp_SRCS
+    ${LWIP_DIR}/src/apps/smtp/smtp.c
+)
+
+# SNTP client
+set(lwipsntp_SRCS
+    ${LWIP_DIR}/src/apps/sntp/sntp.c
+)
+
+# MDNS responder
+set(lwipmdns_SRCS
+    ${LWIP_DIR}/src/apps/mdns/mdns.c
+)
+
+# NetBIOS name server
+set(lwipnetbios_SRCS
+    ${LWIP_DIR}/src/apps/netbiosns/netbiosns.c
+)
+
+# TFTP server files
+set(lwiptftp_SRCS
+    ${LWIP_DIR}/src/apps/tftp/tftp_server.c
+)
+
+# MQTT client files
+set(lwipmqtt_SRCS
+    ${LWIP_DIR}/src/apps/mqtt/mqtt.c
+)
+
+# ARM MBEDTLS related files of lwIP rep
+set(lwipmbedtls_SRCS
+    ${LWIP_DIR}/src/apps/altcp_tls/altcp_tls_mbedtls.c
+    ${LWIP_DIR}/src/apps/altcp_tls/altcp_tls_mbedtls_mem.c
+    ${LWIP_DIR}/src/apps/snmp/snmpv3_mbedtls.c
+)
+
+# All LWIP files without apps
+set(lwipnoapps_SRCS
+    ${lwipcore_SRCS}
+    ${lwipcore4_SRCS}
+    ${lwipcore6_SRCS}
+    ${lwipapi_SRCS}
+    ${lwipnetif_SRCS}
+    ${lwipsixlowpan_SRCS}
+    ${lwipppp_SRCS}
+)
+
+# LWIPAPPFILES: All LWIP APPs
+set(lwipallapps_SRCS
+    ${lwipsnmp_SRCS}
+    ${lwiphttp_SRCS}
+    ${lwipiperf_SRCS}
+    ${lwipsmtp_SRCS}
+    ${lwipsntp_SRCS}
+    ${lwipmdns_SRCS}
+    ${lwipnetbios_SRCS}
+    ${lwiptftp_SRCS}
+    ${lwipmqtt_SRCS}
+    ${lwipmbedtls_SRCS}
+)
+
+# Generate lwip/init.h (version info)
+configure_file(${LWIP_DIR}/src/include/lwip/init.h.cmake.in ${LWIP_DIR}/src/include/lwip/init.h)
+
+# Documentation
+set(DOXYGEN_IN  ${LWIP_DIR}/doc/doxygen/lwip.Doxyfile.cmake.in)
+set(DOXYGEN_OUT ${LWIP_DIR}/doc/doxygen/lwip.Doxyfile)
+configure_file(${DOXYGEN_IN} ${DOXYGEN_OUT})
+
+find_package(Doxygen)
+if (DOXYGEN_FOUND)
+    message("Doxygen build started")
+    # note the option ALL which allows to build the docs together with the application
+    add_custom_target(lwipdocs EXCLUDE_FROM_ALL
+        COMMAND ${DOXYGEN_EXECUTABLE} ${DOXYGEN_OUT}
+        WORKING_DIRECTORY ${LWIP_DIR}/doc/doxygen
+        COMMENT "Generating API documentation with Doxygen"
+        VERBATIM)
+else (DOXYGEN_FOUND)
+    message("Doxygen needs to be installed to generate the doxygen documentation")
+endif (DOXYGEN_FOUND)
+
+# lwIP libraries
+add_library(lwipcore EXCLUDE_FROM_ALL ${lwipnoapps_SRCS})
+add_library(lwipallapps EXCLUDE_FROM_ALL ${lwipallapps_SRCS})