Hi,
Could a gate keeper review this patch? Thank you very much.
2011/9/7 Jian-Xin Lai <[email protected]>
> Hi,
>
> Could a gate keeper review the patch for #827? Thank you very much.
>
> The error message should be reported at toplev.c, line 884:
> 874 if (TREE_CODE (decl) == FUNCTION_DECL
> 875 && DECL_INITIAL (decl) == 0
> 876 && DECL_EXTERNAL (decl)
> 877 && ! DECL_ARTIFICIAL (decl)
> 878 && ! TREE_NO_WARNING (decl)
> 879 && ! TREE_PUBLIC (decl)
> 880 && (warn_unused_function
> 881 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
> 882 {
> 883 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
> 884 pedwarn ("%q+F used but never defined", decl);
> 885 else
> 886 warning (0, "%q+F declared %<static%> but never defined",
> decl);
> 887 /* This symbol is effectively an "extern" declaration now.
> */
> 888 TREE_PUBLIC (decl) = 1;
> 889 assemble_external (decl);
> 890 }
>
>
> But because the TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) is not
> set for the callee in this case, the compiler doesn't report any error on
> this case. The patch is to set this flag when handle the CALL_EXPR:
>
> Index: /open64/open64-trunk/osprey-gcc-4.2.0/gcc/tree.c
> ===================================================================
> --- /open64/open64-trunk/osprey-gcc-4.2.0/gcc/tree.c (revision 3731)
> +++ /open64/open64-trunk/osprey-gcc-4.2.0/gcc/tree.c (working copy)
> @@ -10916,6 +10916,16 @@
> /* bug 12598: Try to fold OBJ_TYPE_REF if it is present
> under the CALL_EXPR. Code adapted from fold_stmt() . */
> tree callee = get_callee_fndecl (t);
> + if (callee && TREE_CODE(callee) == FUNCTION_DECL)
> + {
> + /* we need to emit the function be calleed, no matter
> + if the call is removed later by gcc cfg cleanup, so
> + the open64 backend wouldn't be surprised by missing
> + function definition. */
> + TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (callee)) =
> 1;
> + mark_decl_referenced(callee);
> + }
> +
> if (!(callee && DECL_BUILT_IN(callee)))
> {
> callee = TREE_OPERAND(t,0);
>
>
> --
> Regards,
> Lai Jian-Xin
>
--
Regards,
Lai Jian-Xin
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