Modular adjustments to building.

tools/check/build.jam

@@ -1,9 +1,17 @@
-# Copyright Rene Rivera 2015
+# Copyright Rene Rivera 2015-2023
 # Distributed under the Boost Software License, Version 1.0.
 # (See accompanying file LICENSE_1_0.txt or copy at
 # http://www.boost.org/LICENSE_1_0.txt)
 
-exe predef_check_as_c : predef_check_as_c.c : <include>../include ;
-exe predef_check_as_cpp : predef_check_as_cpp.cpp : <include>../include ;
-exe predef_check_as_objc : predef_check_as_objc.m : <include>../include ;
-exe predef_check_as_objcpp : predef_check_as_objcpp.mm : <include>../include ;
+exe predef_check_as_c : predef_check_as_c.c ;
+exe predef_check_as_cpp : predef_check_as_cpp.cpp ;
+exe predef_check_as_objc : predef_check_as_objc.m : <conditional>@objc ;
+exe predef_check_as_objcpp : predef_check_as_objcpp.mm : <conditional>@objc ;
+
+rule objc ( props * )
+{
+    if ! ( <target-os>darwin in $(props) )
+    {
+        return <build>no ;
+    }
+}

tools/check/predef.jam

@@ -88,7 +88,7 @@ local rule check_target ( language key : requirements * )
     local source_path
         = $(predef_jam:D)/predef_check_cc_as_$(language).$(.$(language).ext) ;
     local include_path
-        = $(predef_jam:D)/../../include $(BOOST_ROOT) ;
+        = $(predef_jam:D)/../../include ;
     obj predef_check_cc_$(key)
         : $(source_path)
         : <include>$(include_path) $(requirements) ;