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[Bug gold/16693] "exclude-libs" drops symbols that are exported through
From: |
hjl.tools at gmail dot com |
Subject: |
[Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol" |
Date: |
Wed, 12 Mar 2014 21:14:58 +0000 |
https://sourceware.org/bugzilla/show_bug.cgi?id=16693
--- Comment #12 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Cary Coutant from comment #9)
> > --dynamic-list isn't used to control which symbols are exported or
> > not. From ld manual:
> >
> > '--dynamic-list=DYNAMIC-LIST-FILE'
> > Specify the name of a dynamic list file to the linker. This is
> > typically used when creating shared libraries to specify a list of
> > global symbols whose references shouldn't be bound to the
> > definition within the shared library, or creating dynamically
> > linked executables to specify a list of symbols which should be
> > added to the symbol table in the executable. This option is only
> > meaningful on ELF platforms which support shared libraries.
>
> True, but a necessary side effect of not binding a symbol within the
> library is exporting it via the dynamic symbol table. This option is
> commonly used to ensure specific symbols are exported (it's basically
> -Bsymbolic with a list of exceptions), but it doesn't *remove* any of
> the locally-bound symbols from the dynamic symbol table. The
> --exclude-libs option does that for symbols defined in the named
> libraries, but also prevents symbols in the dynamic list from being
> added. That, I think, is a bug.
When building shared library, --dynamic-list doesn't change the
dynamic symbol table, i.e.,
ld -shared --dynamic-list ...
and
ld -shared ...
generate the same dynamic symbol table. From this point of view,
ld -shared --exclude-libs=ALL --dynamic-list ...
and
ld -shared --exclude-libs=ALL ...
generate the same dynamic symbol table isn't a bug.
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- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", (continued)
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", hjl.tools at gmail dot com, 2014/03/12
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", ostap73 at gmail dot com, 2014/03/12
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", hjl.tools at gmail dot com, 2014/03/12
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", ostap73 at gmail dot com, 2014/03/12
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", ostap73 at gmail dot com, 2014/03/12
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", ccoutant at google dot com, 2014/03/12
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", ccoutant at google dot com, 2014/03/12
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", ostap73 at gmail dot com, 2014/03/12
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", ccoutant at google dot com, 2014/03/12
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", ccoutant at google dot com, 2014/03/12
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol",
hjl.tools at gmail dot com <=
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", ostap73 at gmail dot com, 2014/03/12
- [Bug gold/16693] "exclude-libs" drops symbols that are exported through "dynamic-list" or "export-dynamic-symbol", hjl.tools at gmail dot com, 2014/03/13