refactor

cmake/libraries/boost.cmake

@@ -98,11 +98,7 @@ if(PROJECT_ENABLE_BOOST)
         set(BOOST_CXX_STANDARD 17)
         set(BOOST_OPTIONS cxxflags=-Wno-enum-constexpr-conversion)
         if (PROJECT_IS_DARWIN)
-          set(BOOST_OPTIONS
-            ${BOOST_OPTIONS}
-            define=BOOST_NO_CXX98_FUNCTION_BASE
-            -sICU_PATH=${PROJECT_EXTERNAL_BUILD_ROOT}
-          )
+          set(BOOST_OPTIONS ${BOOST_OPTIONS} define=BOOST_NO_CXX98_FUNCTION_BASE)
         endif()
       else()
         set(BOOST_CXX_STANDARD ${CMAKE_CXX_STANDARD})
@@ -111,6 +107,7 @@ if(PROJECT_ENABLE_BOOST)
 
       if (PROJECT_IS_DARWIN)
         set(BOOST_CXX_STD_DIALECT iso)
+        set(BOOST_OPTIONS ${BOOST_OPTIONS} -sICU_PATH=${PROJECT_EXTERNAL_BUILD_ROOT})
       else()
         set(BOOST_CXX_STD_DIALECT gnu)
       endif()