Merge pull request #4196 from STEllAR-GROUP/osx_build_fixes

minor fixes for building on OSX Darwin

Author: msimberg

src/CMakeLists.txt

@@ -325,11 +325,15 @@ endforeach()
 foreach(_module ${HPX_LIBS})
 
   set(_module_target hpx_${_module})
-  if(UNIX OR APPLE)
+  if(UNIX)
     # add the full archive (some are not used directly in libhpx and need to be
     # forced into libhpx with this option)
-    set(_module_target "-Wl,--whole-archive" "${_module_target}" "-Wl,--no-whole-archive")
-  endif()
+    if(APPLE)
+      set(_module_target "-Wl,-all_load" "${_module_target}")
+    else(APPLE) # not apple, regular linux
+      set(_module_target "-Wl,--whole-archive" "${_module_target}" "-Wl,--no-whole-archive")
+    endif(APPLE)
+  endif(UNIX)
 
   # add module binaries as PRIVATE dependencies to the core hpx library to
   # avoid dependent applicatons have to link against those