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-rw-r--r--lib/unistd.in.h20
1 files changed, 14 insertions, 6 deletions
diff --git a/lib/unistd.in.h b/lib/unistd.in.h
index bb514dbff0..60a7530b4a 100644
--- a/lib/unistd.in.h
+++ b/lib/unistd.in.h
@@ -301,16 +301,24 @@ _GL_WARN_ON_USE (close, "close does not portably work on sockets - "
#endif
-#if @REPLACE_DUP@
-# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
-# define dup rpl_dup
-# endif
+#if @GNULIB_DUP@
+# if @REPLACE_DUP@
+# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+# define dup rpl_dup
+# endif
_GL_FUNCDECL_RPL (dup, int, (int oldfd));
_GL_CXXALIAS_RPL (dup, int, (int oldfd));
-#else
+# else
_GL_CXXALIAS_SYS (dup, int, (int oldfd));
-#endif
+# endif
_GL_CXXALIASWARN (dup);
+#elif defined GNULIB_POSIXCHECK
+# undef dup
+# if HAVE_RAW_DECL_DUP
+_GL_WARN_ON_USE (dup, "dup is unportable - "
+ "use gnulib module dup for portability");
+# endif
+#endif
#if @GNULIB_DUP2@