binutils/SOURCES/binutils-note-merge-improvements.patch

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2019-07-30 04:12:55 +00:00
--- binutils.orig/binutils/objcopy.c 2018-08-06 09:11:02.053503486 +0100
+++ binutils-2.30/binutils/objcopy.c 2018-08-06 09:11:23.296329566 +0100
@@ -2174,7 +2174,7 @@ merge_gnu_build_notes (bfd * abfd, asect
3. Eliminate any NT_GNU_BUILD_ATTRIBUTE_OPEN notes that have the same
full name field as the immediately preceeding note with the same type
of name and whose address ranges coincide.
- IE - it there are gaps in the coverage of the notes, then these gaps
+ IE - if there are gaps in the coverage of the notes, then these gaps
must be preserved.
4. Combine the numeric value of any NT_GNU_BUILD_ATTRIBUTE_OPEN notes
of type GNU_BUILD_ATTRIBUTE_STACK_SIZE.
@@ -2182,16 +2182,47 @@ merge_gnu_build_notes (bfd * abfd, asect
its description field is empty then the nearest preceeding OPEN note
with a non-empty description field must also be preserved *OR* the
description field of the note must be changed to contain the starting
- address to which it refers. */
+ address to which it refers.
+ 6. Notes with the same start and end address can be deleted. */
for (pnote = pnotes + 1; pnote < pnotes_end; pnote ++)
{
int note_type;
objcopy_internal_note * back;
objcopy_internal_note * prev_open_with_range = NULL;
+ /* Rule 6 - delete 0-range notes. */
+ if (pnote->start == pnote->end)
+ {
+ duplicate_found = TRUE;
+ pnote->note.type = 0;
+ continue;
+ }
+
/* Rule 2 - preserve function notes. */
if (! is_open_note (pnote))
- continue;
+ {
+ int iter;
+
+ /* Check to see if there is an identical previous function note.
+ This can happen with overlays for example. */
+ for (iter = 0, back = pnote -1; back >= pnotes; back --)
+ {
+ if (back->start == pnote->start
+ && back->end == pnote->end
+ && back->note.namesz == pnote->note.namesz
+ && memcmp (back->note.namedata, pnote->note.namedata, pnote->note.namesz) == 0)
+ {
+ duplicate_found = TRUE;
+ pnote->note.type = 0;
+ break;
+ }
+
+ /* Don't scan too far back however. */
+ if (iter ++ > 16)
+ break;
+ }
+ continue;
+ }
note_type = pnote->note.namedata[attribute_type_byte];