[raphael-nabet]

MacOS support on arm64

Hi @nitawa ,

To ensure that KERNEL is compatible with the build of SALOME on macOS, we modified some elements:

• src/Container/Component_i.cxx,
• src/Container/Container_i.cxx,
• src/DSC/DSC_Python/calcium.i,
• src/DSC/DSC_User/Datastream/Calcium/CalciumC.c,
• src/Launcher/SALOME_ExternalServerLauncher.cxx,
• src/ParallelContainer/SALOME_ParallelComponent_i.cxx,
• src/SALOMESDS/SALOMESDS_KeyWaiter.cxx,
• src/SALOMESDS/SALOMESDS_KeyWaiter.hxx,
• src/SALOMETraceCollector/SALOMETraceCollector.cxx,
• src/TestContainer/CMakeLists.txt:

Build and runtime fixes for macOS (clang, libc++, no glibc extensions). All the changes apply on macOS
only.

Threads: pthread_t is a pointer on macOS

Component_i.cxx, SALOME_ParallelComponent_i.cxx: _ThreadId > 0 is an ordered comparison of a
pointer with 0, rejected by clang. On macOS it is replaced by a non-null test and pthread_equal() in
Kill/Stop/Suspend/Resume/CpuUsed.

Semaphores: unnamed POSIX semaphores are not implemented

sem_init() fails on macOS. SALOMESDS::KeyWaiter and SALOMETraceCollector use a GCD
dispatch_semaphore_t instead. In SALOMETraceCollector, the semaphore of a previous instance is
released before a new one is created.

glibc-only functions

• Container_i.cxx: the environment is read with *_NSGetEnviron() in GetOSEnvironment(), as
  environ is not available to dylibs.
• SALOME_ExternalServerLauncher.cxx: get_current_dir_name() replaced by getcwd(nullptr, 0).

Calcium / DSC

• CalciumC.c: clang rejects implicit function declarations. Added the C prototypes of the ecp_*
  functions defined in C++ by CALCIUM_C2CPP_INTERFACE_CXX_.
• calcium.i: explicit PyArrayObject* cast in array_type().

Link

TestContainer: the libraries already linked on Windows are also linked on macOS, where dylibs must
resolve all their symbols at link time.

Depends on SalomePlatform/salome_bootstrap#3 (BaseTraceCollector::_sem as a dispatch_semaphore_t).