From: "Martin Storsjö" <martin@martin.st>
To: Jan Beulich <jbeulich@suse.com>
Cc: binutils@sourceware.org
Subject: Re: [PATCH] ld: Add support for a new option, -exclude-symbols, in COFF object file directives
Date: Wed, 20 Jul 2022 15:39:56 +0300 (EEST) [thread overview]
Message-ID: <f465cba3-b428-2f1-c26-2872a80a495@martin.st> (raw)
In-Reply-To: <65b20943-0c1b-28f6-6f57-d3c4b8a9b75f@suse.com>
On Wed, 20 Jul 2022, Jan Beulich wrote:
> On 19.07.2022 22:33, Martin Storsjo wrote:
>> @@ -946,6 +957,7 @@ diropts[] =
>> { "-attr", SECTIONS },
>> { "-export", EXPORTS },
>> { "-aligncomm", ALIGNCOMM },
>> + { "-exclude-symbols", EXCLUDE_SYMBOLS },
Thanks for having a look!
> I was a little concerned by the - in the middle, but the (custom)
> def-file lexer looks to be treating - the same as ISALPHA() chars.
Thanks for checking!
> Nevertheless it would be quite helpful if there were two testcases
> here - one with the new directive used in an object file's .drectve
> section and another with it used in a .def file.
A testcase certainly would be good here. I'm not familiar with binutils'
tests from before - I presume I'd make a native build (not having binutils
set up with a cross target) and run "make check", and I'd find examples of
existing tests in ld/testsuite/ld-pe?
I guess it'd be good with one test for i386 and one for x86_64 (or both
cases merged into one?), assembling an .s file and linking it, and then
checking the export table. Are there any similar existing tests to serve
as example?
This directive isn't supposed to be used from a def file though (just like
the aligncomm directive), see the comment in deffile.h.
> The other thing is: According to def_exclude_symbols() each
> directive is followed by exactly one symbol afaict. Hence
> -exclude-symbol (singular) would seem more appropriate for the
> option.
Actually, when the option values later are added to the exclusion list by
pe_dll_add_excludes, they're split/tokenized by commas (and colon,
apparently). I guess this could be made clearer by renaming the struct
field though, maybe to "symbol_names"?
I'd prefer to keep the plural form in the directive name in any case, for
consistency with the command line option, even if it uses the
-<name>:<value> option form (like all other embedded directives) instead
of --<name>=<value> or --<name> <value> on the command line.
// Martin
next prev parent reply other threads:[~2022-07-20 12:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-19 20:33 Martin Storsjo
2022-07-20 7:49 ` Jan Beulich
2022-07-20 12:39 ` Martin Storsjö [this message]
2022-07-20 13:43 ` Jan Beulich
2022-07-20 15:10 ` Martin Storsjö
2022-07-20 15:50 ` Jan Beulich
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