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| author | Alan Modra <amodra@gmail.com> | 2021-03-01 08:22:49 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2021-03-01 17:28:03 +1030 |
| commit | 8ee10e86093150c70360d9e26b29e6d9b6398f33 (patch) | |
| tree | d9b022e21486a83064279ec452009a394b62a8b0 /ld/lexsup.c | |
| parent | 7824c1d22fcab8a68162634d4293f4a6666ca43e (diff) | |
| download | binutils-gdb-8ee10e86093150c70360d9e26b29e6d9b6398f33.tar.gz | |
PR27451, -z start_stop_gc
When --gc-sections is in effect, a reference from a retained section
to __start_SECNAME or __stop_SECNAME causes all input sections named
SECNAME to also be retained, if SECNAME is representable as a C
identifier and either __start_SECNAME or __stop_SECNAME is synthesized
by the linker. Add an option to disable that feature, effectively
ignoring any relocation that references a synthesized linker defined
__start_ or __stop_ symbol.
PR 27451
include/
* bfdlink.h (struct bfd_link_info): Add start_stop_gc.
bfd/
* elflink.c (_bfd_elf_gc_mark_rsec): Ignore synthesized linker
defined start/stop symbols when start_stop_gc.
(bfd_elf_gc_mark_dynamic_ref_symbol): Likewise.
(bfd_elf_define_start_stop): Don't modify ldscript_def syms.
* linker.c (bfd_generic_define_start_stop): Likewise.
ld/
* emultempl/elf.em: Handle -z start-stop-gc and -z nostart-stop-gc.
* lexsup.c (elf_static_list_options): Display help for them. Move
help for -z stack-size to here from elf_shlib_list_options. Add
help for -z start-stop-visibility and -z undefs.
* ld.texi: Document -z start-stop-gc and -z nostart-stop-gc.
* NEWS: Mention -z start-stop-gc.
* testsuite/ld-gc/start2.s,
* testsuite/ld-gc/start2.d: New test.
* testsuite/ld-gc/gc.exp: Run it.
Diffstat (limited to 'ld/lexsup.c')
| -rw-r--r-- | ld/lexsup.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/ld/lexsup.c b/ld/lexsup.c index f005a58a045..36492abb405 100644 --- a/ld/lexsup.c +++ b/ld/lexsup.c @@ -2070,8 +2070,6 @@ elf_shlib_list_options (FILE *file) -z common Generate common symbols with STT_COMMON type\n")); fprintf (file, _("\ -z nocommon Generate common symbols with STT_OBJECT type\n")); - fprintf (file, _("\ - -z stack-size=SIZE Set size of stack segment\n")); if (link_info.textrel_check == textrel_check_error) fprintf (file, _("\ -z text Treat DT_TEXTREL in output as error (default)\n")); @@ -2116,8 +2114,12 @@ elf_static_list_options (FILE *file) fprintf (file, _("\ -z defs Report unresolved symbols in object files\n")); fprintf (file, _("\ + -z undefs Ignore unresolved symbols in object files\n")); + fprintf (file, _("\ -z muldefs Allow multiple definitions\n")); fprintf (file, _("\ + -z stack-size=SIZE Set size of stack segment\n")); + fprintf (file, _("\ -z execstack Mark executable as requiring executable stack\n")); fprintf (file, _("\ -z noexecstack Mark executable as not requiring executable stack\n")); @@ -2127,6 +2129,13 @@ elf_static_list_options (FILE *file) -z nounique-symbol Keep duplicated local symbol names (default)\n")); fprintf (file, _("\ -z globalaudit Mark executable requiring global auditing\n")); + fprintf (file, _("\ + -z start-stop-gc Enable garbage collection on __start/__stop\n")); + fprintf (file, _("\ + -z nostart-stop-gc Don't garbage collect __start/__stop (default)\n")); + fprintf (file, _("\ + -z start-stop-visibility=V Set visibility of built-in __start/__stop symbols\n\ + to DEFAULT, PROTECTED, HIDDEN or INTERNAL\n")); } static void |