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* [gcc(refs/vendors/redhat/heads/gcc-8-branch)] lto/96385 - avoid unused global UNDEFs in debug objects
@ 2021-05-14 14:54 Jakub Jelinek
0 siblings, 0 replies; only message in thread
From: Jakub Jelinek @ 2021-05-14 14:54 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:098a5d0349a0a8285970f4e0141a8de4e63ded52
commit 098a5d0349a0a8285970f4e0141a8de4e63ded52
Author: Richard Biener <rguenther@suse.de>
Date: Mon Aug 3 15:05:37 2020 +0200
lto/96385 - avoid unused global UNDEFs in debug objects
Unused global UNDEFs can have side-effects in some circumstances so
the following patch avoids them by treating them the same as other
to be discarded DEFs - make them local.
2020-08-03 Richard Biener <rguenther@suse.de>
PR lto/96385
libiberty/
* simple-object-elf.c
(simple_object_elf_copy_lto_debug_sections): Localize global
UNDEFs and reuse the prevailing name.
(cherry picked from commit b32c5d0b72fda2588b4e170e75a9c64e4bf266c7)
Diff:
---
libiberty/simple-object-elf.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libiberty/simple-object-elf.c b/libiberty/simple-object-elf.c
index 0505c1dc001..3732e8fbfcc 100644
--- a/libiberty/simple-object-elf.c
+++ b/libiberty/simple-object-elf.c
@@ -1446,6 +1446,11 @@ simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj,
&& st_shndx < shnum
&& pfnret[st_shndx - 1] == -1)
discard = 1;
+ /* We also need to remove global UNDEFs which can
+ cause link fails later. */
+ else if (st_shndx == SHN_UNDEF
+ && ELF_ST_BIND (*st_info) == STB_GLOBAL)
+ discard = 1;
if (discard)
{
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