Fix build for macOS (#346)

* Add Twitter and Readthedocs shields (#307) (#308)

* Add Twitter and Readthedocs shields

Signed-off-by: Pablo Garrido <[email protected]>

* Update

Signed-off-by: Pablo Garrido <[email protected]>

* Fix

Signed-off-by: Pablo Garrido <[email protected]>
(cherry picked from commit 8b78d22)

Co-authored-by: Pablo Garrido <[email protected]>

* Fix build for macOS

- Add check for CMAKE_SYSTEM_NAME "Darwin".

Signed-off-by: Rhys Mainwaring <[email protected]>

---------

Signed-off-by: Rhys Mainwaring <[email protected]>
Co-authored-by: Pablo Garrido <[email protected]>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

CMakeLists.txt

@@ -146,6 +146,8 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Android")
     set(UCLIENT_PLATFORM_LINUX ON)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
     set(UCLIENT_PLATFORM_WINDOWS ON)
+elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+    set(UCLIENT_PLATFORM_MACOS ON)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Generic")
     if(PLATFORM_NAME STREQUAL "nuttx")
         set(UCLIENT_PLATFORM_NUTTX ON)
@@ -160,7 +162,7 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "Generic")
     endif()
 endif()
 
-if(UCLIENT_PLATFORM_LINUX OR UCLIENT_PLATFORM_NUTTX OR UCLIENT_PLATFORM_ZEPHYR)
+if(UCLIENT_PLATFORM_LINUX OR UCLIENT_PLATFORM_MACOS OR UCLIENT_PLATFORM_NUTTX OR UCLIENT_PLATFORM_ZEPHYR)
     set(UCLIENT_PLATFORM_POSIX ON)
 endif()