Changed separation to strict and non-strict implementations and include only the header files needed by either.

include/boost/preprocessor/arithmetic/mod.hpp

@@ -15,14 +15,12 @@
 # ifndef BOOST_PREPROCESSOR_ARITHMETIC_MOD_HPP
 # define BOOST_PREPROCESSOR_ARITHMETIC_MOD_HPP
 #
-# include <boost/preprocessor/arithmetic/detail/div_base.hpp>
 # include <boost/preprocessor/config/config.hpp>
-# include <boost/preprocessor/control/iif.hpp>
-# include <boost/preprocessor/facilities/identity.hpp>
-# include <boost/preprocessor/tuple/elem.hpp>
-# include <boost/preprocessor/arithmetic/detail/is_1_number.hpp>
 #
-# if BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC()
+# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_STRICT()
+#
+# include <boost/preprocessor/arithmetic/detail/div_base.hpp>
+# include <boost/preprocessor/tuple/elem.hpp>
 #
 # /* BOOST_PP_MOD */
 #
@@ -44,6 +42,12 @@
 #
 # else
 #
+# include <boost/preprocessor/arithmetic/detail/div_base.hpp>
+# include <boost/preprocessor/control/iif.hpp>
+# include <boost/preprocessor/facilities/identity.hpp>
+# include <boost/preprocessor/tuple/elem.hpp>
+# include <boost/preprocessor/arithmetic/detail/is_1_number.hpp>
+#
 # /* BOOST_PP_MOD */
 #
 #    define BOOST_PP_MOD(x, y) BOOST_PP_IIF(BOOST_PP_DETAIL_IS_1_NUMBER(y),BOOST_PP_IDENTITY_N(0,2),BOOST_PP_MOD_DO)(x,y)