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| author | H.J. Lu <hjl.tools@gmail.com> | 2020-09-12 05:37:30 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2020-09-12 05:37:43 -0700 |
| commit | 496afd17055aeb7d8f45e01715c475664f2b73bd (patch) | |
| tree | 221e0db337f288cbced1e5e4189463c23733a1a1 /ld/lexsup.c | |
| parent | e71774ed24cc6890285b174cb95caf79a7622466 (diff) | |
| download | gdb-496afd17055aeb7d8f45e01715c475664f2b73bd.zip gdb-496afd17055aeb7d8f45e01715c475664f2b73bd.tar.gz gdb-496afd17055aeb7d8f45e01715c475664f2b73bd.tar.bz2 | |
elf: Add -z unique-symbol to avoid duplicated local symbol names
The symbol string table in the .symtab section is optional and cosmetic.
The contents of the .symtab section have no impact on run-time execution.
The symbol names in the symbol string table help distinguish addresses at
different locations. Add a linker option, -z unique-symbol, to avoid
duplicated local symbol names in the symbol string table.
This feature was well received by the livepatch maintainers. It not only
solves the duplicated local symbol name problem, but also would allow
livepatch to more precisely locate duplicate symbols in general for
patching.
bfd/
PR ld/26391
* elflink.c (elf_final_link_info): Add local_hash_table.
(local_hash_entry): New.
(local_hash_newfunc): Likewise.
(elf_link_output_symstrtab): Append ".COUNT" to duplicated local
symbols.
(bfd_elf_final_link): Initialize and free local_hash_table for
"-z unique-symbol".
include/
PR ld/26391
* bfdlink.h (bfd_link_info): Add unique_symbol.
ld/
PR ld/26391
* NEWS: Mention "-z unique-symbol".
* emultempl/elf.em (gld${EMULATION_NAME}_handle_option): Handle
"-z unique-symbol" and "-z nounique-symbol".
* ld.texi: Document "-z unique-symbol" and "-z nounique-symbol".
* lexsup.c (elf_static_list_options): Add "-z unique-symbol" and
"-z nounique-symbol".
* testsuite/ld-elf/elf.exp: Add PR ld/26391 tests.
* testsuite/ld-elf/pr26391.nd: New file.
* testsuite/ld-elf/pr26391.out: Likewise.
* testsuite/ld-elf/pr26391a.c: Likewise.
* testsuite/ld-elf/pr26391b.c: Likewise.
* testsuite/ld-elf/pr26391c.c: Likewise.
* testsuite/ld-elf/pr26391d.c: Likewise.
Diffstat (limited to 'ld/lexsup.c')
| -rw-r--r-- | ld/lexsup.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/ld/lexsup.c b/ld/lexsup.c index b9cc8a1..b8f0667 100644 --- a/ld/lexsup.c +++ b/ld/lexsup.c @@ -2050,6 +2050,10 @@ elf_static_list_options (FILE *file) fprintf (file, _("\ -z noexecstack Mark executable as not requiring executable stack\n")); fprintf (file, _("\ + -z unique-symbol Avoid duplicated local symbol names\n")); + fprintf (file, _("\ + -z nounique-symbol Keep duplicated local symbol names (default)\n")); + fprintf (file, _("\ -z globalaudit Mark executable requiring global auditing\n")); } |