On Wed, Jul 14, 2021 at 7:50 AM Sebastian Huber
<sebastian.hu...@embedded-brains.de> wrote:
>
> Hello,
>
> I noticed that the following static read-only object gets optimized away
> if optimization is enabled:
>
> /* Generate the pointer to the gcov_info_var in a dedicated section. */
>
> static void
> build_gcov_info_var_registration (tree gcov_info_type)
> {
> tree var = build_decl (BUILTINS_LOCATION,
> VAR_DECL, NULL_TREE,
> build_pointer_type (gcov_info_type));
> TREE_STATIC (var) = 1;
> TREE_READONLY (var) = 1;
> char name_buf[32];
> ASM_GENERATE_INTERNAL_LABEL (name_buf, "LPBX", 2);
> DECL_NAME (var) = get_identifier (name_buf);
> get_section (profile_info_section, SECTION_UNNAMED, NULL);
> set_decl_section_name (var, profile_info_section);
> DECL_INITIAL (var) = build_fold_addr_expr (gcov_info_var);
> varpool_node::finalize_decl (var);
> }
>
> I tried to add a TREE_USED (var) = 1, but this seems to have no effect.
> Could someone give me a hint what needs to be added so that this object
> is created? The object is placed in a linker set.
You can call mark_decl_referenced (var), TREE_USED is only used by frontends.
Richard.
>
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