From 37397bf16406216784f51991fdc004533a3863fa Mon Sep 17 00:00:00 2001
From: Peter van der Perk <57130844+PetervdPerk-NXP@users.noreply.github.com>
Date: Wed, 26 Jul 2023 05:55:34 -0400
Subject: [PATCH] Add POSIX target for small posix based RTOS's i.e. NuttX
 (#194)

---
 CMakeLists.txt            | 18 ++++++++++++++----
 src/system/unix/network.c |  2 ++
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 88e7dd133..332bf0411 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,7 +11,7 @@
 # Contributors:
 # ZettaScale Zenoh Team, <zenoh@zettascale.tech>
 #
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.13)
 
 project(zenohpico VERSION 0.10.0.0 LANGUAGES C)
 
@@ -63,8 +63,14 @@ if(NOT CMAKE_BUILD_TYPE)
 endif()
 string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE)
 
+
+set(CHECK_THREADS "ON")
+
 if(CMAKE_SYSTEM_NAME MATCHES "Linux")
   add_definition(ZENOH_LINUX)
+elseif(POSIX_COMPATIBLE)
+  add_definition(ZENOH_LINUX)
+  set(CHECK_THREADS "OFF")
 elseif(CMAKE_SYSTEM_NAME MATCHES "BSD")
   add_definition(ZENOH_BSD)
 elseif(CMAKE_SYSTEM_NAME MATCHES "Darwin")
@@ -101,7 +107,9 @@ if(SKBUILD)
 endif()
 
 set(THREADS_PREFER_PTHREAD_FLAG ON)
-find_package(Threads REQUIRED)
+if(CHECK_THREADS)
+  find_package(Threads REQUIRED)
+endif()
 
 if(CMAKE_BUILD_TYPE MATCHES "DEBUG")
   if(UNIX)
@@ -162,7 +170,7 @@ file(GLOB Sources "src/*.c"
 if(WITH_ZEPHYR)
   file (GLOB Sources_Zephyr "src/system/zephyr/*.c")
   list(APPEND Sources ${Sources_Zephyr})
-elseif(CMAKE_SYSTEM_NAME MATCHES "Linux" OR CMAKE_SYSTEM_NAME MATCHES "Darwin" OR CMAKE_SYSTEM_NAME MATCHES "BSD")
+elseif(CMAKE_SYSTEM_NAME MATCHES "Linux" OR CMAKE_SYSTEM_NAME MATCHES "Darwin" OR CMAKE_SYSTEM_NAME MATCHES "BSD" OR POSIX_COMPATIBLE)
   file (GLOB Sources_Unix "src/system/unix/*.c")
   list(APPEND Sources ${Sources_Unix})
 elseif(CMAKE_SYSTEM_NAME MATCHES "Emscripten")
@@ -178,7 +186,9 @@ link_directories(${LIBRARY_OUTPUT_PATH})
 
 target_sources(${Libname} PRIVATE ${Sources})
 
-target_link_libraries(${Libname} Threads::Threads)
+if(CHECK_THREADS)
+  target_link_libraries(${Libname} Threads::Threads)
+endif()
 
 if(CMAKE_SYSTEM_NAME MATCHES "Linux")
   target_link_libraries(${Libname} rt)
diff --git a/src/system/unix/network.c b/src/system/unix/network.c
index 8a71d1d82..cde8766e6 100644
--- a/src/system/unix/network.c
+++ b/src/system/unix/network.c
@@ -316,6 +316,7 @@ int8_t _z_open_udp_multicast(_z_sys_net_socket_t *sock, const _z_sys_net_endpoin
                 ret = _Z_ERR_GENERIC;
             }
 
+#ifndef UNIX_NO_MULTICAST_IF
             if (lsockaddr->sa_family == AF_INET) {
                 if ((ret == _Z_RES_OK) &&
                     (setsockopt(sock->_fd, IPPROTO_IP, IP_MULTICAST_IF, &((struct sockaddr_in *)lsockaddr)->sin_addr,
@@ -331,6 +332,7 @@ int8_t _z_open_udp_multicast(_z_sys_net_socket_t *sock, const _z_sys_net_endpoin
             } else {
                 ret = _Z_ERR_GENERIC;
             }
+#endif
 
             // Create lep endpoint
             if (ret == _Z_RES_OK) {