OK.
On Wed, Apr 11, 2018 at 7:09 AM, Richard Biener wrote:
>
> The following fixes the missing .debug_line in the early LTO debug
> DWARF which makes all DW_AT_decl_file invalid.
>
> LTO bootstrapped on x86_64-unknown-linux-gnu, LTO bootstrap with -g3
> still running, so is regtesting.
>
> I verified it works with thin and fat LTO and that the early DWARF
> has a proper .debug_line including the reference from the CU. This
> then also makes dwz happy with simple objects that do not contain
> DW_OP_GNU_variable_value.
>
> Ok for trunk if the rest of testing succeeds?
>
> Thanks,
> Richard.
>
> 2018-04-11 Richard Biener
>
> PR lto/85339
> * dwarf2out.c (dwarf2out_finish): Remove DW_AT_stmt_list attribute
> from early DWARF output.
> (dwarf2out_early_finish): Output line info unconditionally into
> early DWARF and add reference to it.
>
> Index: gcc/dwarf2out.c
> ===
> --- gcc/dwarf2out.c (revision 259308)
> +++ gcc/dwarf2out.c (working copy)
> @@ -31045,7 +31046,8 @@ dwarf2out_finish (const char *)
>/* Reset die CU symbol so we don't output it twice. */
>comp_unit_die ()->die_id.die_symbol = NULL;
>
> - /* Remove DW_AT_macro from the early output. */
> + /* Remove DW_AT_macro and DW_AT_stmt_list from the early output. */
> + remove_AT (comp_unit_die (), DW_AT_stmt_list);
>if (have_macinfo)
> remove_AT (comp_unit_die (), DEBUG_MACRO_ATTRIBUTE);
>
> @@ -31681,6 +31683,7 @@ static void
> dwarf2out_early_finish (const char *filename)
> {
>set_early_dwarf s;
> + char dl_section_ref[MAX_ARTIFICIAL_LABEL_BYTES];
>
>/* PCH might result in DW_AT_producer string being restored from the
> header compilation, so always fill it with empty string initially
> @@ -31829,6 +31836,16 @@ dwarf2out_early_finish (const char *file
> ctnode != NULL; ctnode = ctnode->next)
> add_sibling_attributes (ctnode->root_die);
>
> + /* AIX Assembler inserts the length, so adjust the reference to match the
> + offset expected by debuggers. */
> + strcpy (dl_section_ref, debug_skeleton_line_section_label);
> + if (XCOFF_DEBUGGING_INFO)
> +strcat (dl_section_ref, DWARF_INITIAL_LENGTH_SIZE_STR);
> +
> + if (debug_info_level >= DINFO_LEVEL_TERSE)
> +add_AT_lineptr (comp_unit_die (), DW_AT_stmt_list,
> + dl_section_ref);
> +
>if (have_macinfo)
> add_AT_macptr (comp_unit_die (), DEBUG_MACRO_ATTRIBUTE,
>macinfo_section_label);
> @@ -31898,11 +31915,6 @@ dwarf2out_early_finish (const char *file
>output_macinfo (debug_skeleton_line_section_label, true);
>dw2_asm_output_data (1, 0, "End compilation unit");
>
> - /* Emit a skeleton debug_line section. */
> - switch_to_section (debug_skeleton_line_section);
> - ASM_OUTPUT_LABEL (asm_out_file, debug_skeleton_line_section_label);
> - output_line_info (true);
> -
>if (flag_fat_lto_objects)
> {
> vec_free (macinfo_table);
> @@ -31910,6 +31922,10 @@ dwarf2out_early_finish (const char *file
> }
> }
>
> + /* Emit a skeleton debug_line section. */
> + switch_to_section (debug_skeleton_line_section);
> + ASM_OUTPUT_LABEL (asm_out_file, debug_skeleton_line_section_label);
> + output_line_info (true);
>
>/* If we emitted any indirect strings, output the string table too. */
>if (debug_str_hash || skeleton_debug_str_hash)
