The AIX Assembler inserts the DWARF section lengths itself.
dwarf2out.c previously has been modified to not emit the length on
AIX. All well and good until GCC emits a label that it believes
references the start of a DWARF section, but actually references an
address _after_ the section length inserted by AIX.
.dwsect 0x20000
<AIX inserts section length>
Ldebug_line0:
.vbyte 2,0x4
....
This particular issue causes an incorrect offset for DW_AT_stmt_list.
The following patch adjusts the reference to the label on AIX to
subtract the size of the section length information, which makes GDB
much happier.
Bootstrapped on powerpc-ibm-aix7.2.0.0
Okay?
Thanks, David
* dwarf2out.c (dwarf2out_finish): Use a local copy of
debug_line_section_label.
On AIX, append an expression to subtract the size of the
section length info.
Index: dwarf2out.c
===================================================================
--- dwarf2out.c (revision 248131)
+++ dwarf2out.c (working copy)
@@ -29650,6 +29650,7 @@ dwarf2out_finish (const char *)
comdat_type_node *ctnode;
dw_die_ref main_comp_unit_die;
unsigned char checksum[16];
+ char dl_section_label[MAX_ARTIFICIAL_LABEL_BYTES];
/* Flush out any latecomers to the limbo party. */
flush_limbo_die_list ();
@@ -29767,9 +29768,13 @@ dwarf2out_finish (const char *)
}
}
+ strcpy (dl_section_label, debug_line_section_label);
+ if (XCOFF_DEBUGGING_INFO)
+ strcat (dl_section_label, TARGET_64BIT ? "-12" : "-4");
+
if (debug_info_level >= DINFO_LEVEL_TERSE)
add_AT_lineptr (main_comp_unit_die, DW_AT_stmt_list,
- debug_line_section_label);
+ dl_section_label);
if (have_macinfo)
add_AT_macptr (comp_unit_die (),
@@ -29845,7 +29850,7 @@ dwarf2out_finish (const char *)
if (debug_info_level >= DINFO_LEVEL_TERSE)
add_AT_lineptr (ctnode->root_die, DW_AT_stmt_list,
(!dwarf_split_debug_info
- ? debug_line_section_label
+ ? dl_section_label
: debug_skeleton_line_section_label));
output_comdat_type_unit (ctnode);
