feat(darwin): add macOS port

cmake/Darwin.cmake

@@ -0,0 +1,25 @@
+#********************************************************************
+#        _       _         _
+#  _ __ | |_  _ | |  __ _ | |__   ___
+# | '__|| __|(_)| | / _` || '_ \ / __|
+# | |   | |_  _ | || (_| || |_) |\__ \
+# |_|    \__|(_)|_| \__,_||_.__/ |___/
+#
+# www.rt-labs.com
+# Copyright 2026 rt-labs AB, Sweden.
+#
+# This software is licensed under the terms of the BSD 3-clause
+# license. See the file LICENSE distributed with this software for
+# full license information.
+#*******************************************************************/
+find_package(Threads)
+
+add_subdirectory(src/darwin)
+
+if (BUILD_TESTING)
+  set(GOOGLE_TEST_INDIVIDUAL TRUE)
+endif()
+
+set (OSAL_DEFAULT_SYSTEM
+  osal-darwin
+  CACHE STRING ${OSAL_DEFAULT_SYSTEM_HELP_STRING})

cmake/OsalConfig.cmake.in

@@ -1,5 +1,5 @@
 
-if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
+if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux" OR ${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
     find_package(Threads REQUIRED)
 endif()
 

src/darwin/CMakeLists.txt

@@ -0,0 +1,60 @@
+#********************************************************************
+#        _       _         _
+#  _ __ | |_  _ | |  __ _ | |__   ___
+# | '__|| __|(_)| | / _` || '_ \ / __|
+# | |   | |_  _ | || (_| || |_) |\__ \
+# |_|    \__|(_)|_| \__,_||_.__/ |___/
+#
+# www.rt-labs.com
+# Copyright 2026 rt-labs AB, Sweden.
+#
+# This software is licensed under the terms of the BSD 3-clause
+# license. See the file LICENSE distributed with this software for
+# full license information.
+#*******************************************************************/
+
+
+find_package(Threads)
+
+set(_osal_sys osal-darwin)
+add_library(${_osal_sys})
+
+target_compile_features(${_osal_sys}
+  PUBLIC
+  c_std_99
+  )
+
+# Use position independent code if platform supports shared libraries
+get_property(SUPPORTS_SHARED GLOBAL PROPERTY TARGET_SUPPORTS_SHARED_LIBS)
+if (SUPPORTS_SHARED)
+  set_property(TARGET ${_osal_sys} PROPERTY POSITION_INDEPENDENT_CODE ON)
+endif()
+
+target_sources(${_osal_sys}
+  PRIVATE
+  osal.c
+  osal_log.c
+  )
+
+target_compile_options(${_osal_sys}
+  PRIVATE
+  -Wall
+  -Wextra
+  -Werror
+  -Wno-unused-parameter
+  )
+
+target_include_directories(${_osal_sys} PRIVATE
+  sys
+)
+
+target_link_libraries(${_osal_sys}
+  PUBLIC
+  osal-interface
+  Threads::Threads
+  )
+
+install(
+  TARGETS ${_osal_sys}
+  EXPORT OsalTargets
+  )