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Date: Thu, 15 Aug 2024 13:12:18 -0400
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Subject: Re: bug#72613: Lack of fast-install on Linux proves painful w/ LTO
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To: Sam James <sam@HIDDEN>
References: <87le0zg5cj.fsf@HIDDEN>
From: Nick Bowler <nbowler@HIDDEN>
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On 2024-08-13 23:18, Sam James wrote:
> At the moment, it looks like fast-install is disabled on Linux:
I think the comment is very out of date.
> # This must be glibc/ELF.
> linux* | k*bsd*-gnu | kopensolaris*-gnu | gnu*)
> version_type=linux # correct to gnu/linux during the next big refactor
> need_lib_prefix=no
> need_version=no
> ...
> # This implies no fast_install, which is unacceptable.
> # Some rework will be needed to allow for fast_install
> # before this can be enabled.
> hardcode_into_libs=yes
>
> This is particularly painful when using LTO, as you end up with a pretty
> time-consuming relink for something which is in theory avoidable.
On GNU/Linux, I believe relink should only be performed for uninstalled
shared libraries that link against other uninstalled shared libraries.
This is needed because the necessary runpaths are, as suggested by the
name hardcode_into_libs, hardcoded into libraries. You can see this by
running readelf on such libraries in the build tree. This has to be
changed to remove the build location when the libraries are ultimately
installed, and the way libtool currently does that is by relinking.
For normal libraries which do not depend on uninstalled shared libraries,
and for programs, no relinking is expected on GNU/Linux, so you should be
able to avoid this if you can restructure your project to avoid such
transitive dependencies between uninstalled shared libraries.
For the special case where libraries are located in the same build
directory and also installed into the same directory, on some platforms
(at least Solaris and GNU/Linux) Libtool could perhaps be changed to
generate runpaths using ${ORIGIN} which would not need to be changed
on installation. That might help avoid relinks in certain cases.
Cheers,
Nick
bug-libtool@HIDDEN:bug#72613; Package libtool.
Full text available.Received: (at 72613) by debbugs.gnu.org; 15 Aug 2024 16:05:43 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Aug 15 12:05:43 2024 Received: from localhost ([127.0.0.1]:49571 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1secyt-0001zE-Io for submit <at> debbugs.gnu.org; Thu, 15 Aug 2024 12:05:43 -0400 Received: from woodpecker.gentoo.org ([140.211.166.183]:57804 helo=smtp.gentoo.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <sam@HIDDEN>) id 1secyr-0001yr-Uh for 72613 <at> debbugs.gnu.org; Thu, 15 Aug 2024 12:05:42 -0400 From: Sam James <sam@HIDDEN> To: Ileana Dumitrescu <ileanadumitrescu95@HIDDEN> Subject: Re: bug#72613: Lack of fast-install on Linux proves painful w/ LTO In-Reply-To: <962b6571-a372-4814-84de-f240706c3d87@HIDDEN> (Ileana Dumitrescu's message of "Thu, 15 Aug 2024 18:51:53 +0300") Organization: Gentoo References: <87le0zg5cj.fsf@HIDDEN> <962b6571-a372-4814-84de-f240706c3d87@HIDDEN> Date: Thu, 15 Aug 2024 17:04:54 +0100 Message-ID: <87bk1tbwm1.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 72613 Cc: 72613 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) --=-=-= Content-Type: text/plain Ileana Dumitrescu <ileanadumitrescu95@HIDDEN> writes: > Severity: wishlist > > [...] > For now, I think it would be best to look more into this > after the stable release, but if anyone has any ideas or corrections, > please add them here. Waiting is completely fine with me until after the release. I will try find time to digest the logic as well (but no promises as I've tried already and it's complicated). I just wanted to file it so I didn't forget. Cheers. --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iOUEARYKAI0WIQQlpruI3Zt2TGtVQcJzhAn1IN+RkAUCZr4nJ18UgAAAAAAuAChp c3N1ZXItZnByQG5vdGF0aW9ucy5vcGVucGdwLmZpZnRoaG9yc2VtYW4ubmV0MjVB NkJCODhERDlCNzY0QzZCNTU0MUMyNzM4NDA5RjUyMERGOTE5MA8cc2FtQGdlbnRv by5vcmcACgkQc4QJ9SDfkZAtGQD+LrdA4WBx9RvdQaKwqwNtRRGYZMhufJOYRGeB qVYgTfIA/3IYHShEFsGKBauh4iEem6DnfctFF2LQ3J23iZEB/GQF =KJUG -----END PGP SIGNATURE----- --=-=-=--
bug-libtool@HIDDEN:bug#72613; Package libtool.
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<at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.8 (/) This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------NHJkLoAL0toRDI7WFodFnKA2 Content-Type: multipart/mixed; boundary="------------9csNwJMGbNvrC63I1ofPoZZJ"; protected-headers="v1" From: Ileana Dumitrescu <ileanadumitrescu95@HIDDEN> To: Sam James <sam@HIDDEN>, 72613 <at> debbugs.gnu.org Message-ID: <962b6571-a372-4814-84de-f240706c3d87@HIDDEN> Subject: Re: bug#72613: Lack of fast-install on Linux proves painful w/ LTO References: <87le0zg5cj.fsf@HIDDEN> In-Reply-To: <87le0zg5cj.fsf@HIDDEN> --------------9csNwJMGbNvrC63I1ofPoZZJ Content-Type: multipart/mixed; boundary="------------l87nDtiydeFmLiLJsaUb0i2P" --------------l87nDtiydeFmLiLJsaUb0i2P Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64 U2V2ZXJpdHk6IHdpc2hsaXN0DQoNCk9uIDE0LzA4LzIwMjQgMDY6MTgsIFNhbSBKYW1lcyB3 cm90ZToNCj4gSGkhDQo+IA0KPiBBdCB0aGUgbW9tZW50LCBpdCBsb29rcyBsaWtlIGZhc3Qt aW5zdGFsbCBpcyBkaXNhYmxlZCBvbiBMaW51eDoNCj4gDQo+ICMgVGhpcyBtdXN0IGJlIGds aWJjL0VMRi4NCj4gbGludXgqIHwgaypic2QqLWdudSB8IGtvcGVuc29sYXJpcyotZ251IHwg Z251KikNCj4gICAgdmVyc2lvbl90eXBlPWxpbnV4ICMgY29ycmVjdCB0byBnbnUvbGludXgg ZHVyaW5nIHRoZSBuZXh0IGJpZyByZWZhY3Rvcg0KPiAgICBuZWVkX2xpYl9wcmVmaXg9bm8N 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bug-libtool@HIDDEN:bug#72613; Package libtool.
Full text available.Received: (at submit) by debbugs.gnu.org; 14 Aug 2024 03:18:53 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Aug 13 23:18:53 2024 Received: from localhost ([127.0.0.1]:45801 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1se4XE-0004o0-TJ for submit <at> debbugs.gnu.org; Tue, 13 Aug 2024 23:18:53 -0400 Received: from lists.gnu.org ([209.51.188.17]:49580) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <sam@HIDDEN>) id 1se4XC-0004ns-6X for submit <at> debbugs.gnu.org; Tue, 13 Aug 2024 23:18:51 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <sam@HIDDEN>) id 1se4Wb-0001u9-F2 for bug-libtool@HIDDEN; Tue, 13 Aug 2024 23:18:15 -0400 Received: from woodpecker.gentoo.org ([140.211.166.183] helo=smtp.gentoo.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_CHACHA20_POLY1305:256) (Exim 4.90_1) (envelope-from <sam@HIDDEN>) id 1se4WZ-0008BD-Pp for bug-libtool@HIDDEN; Tue, 13 Aug 2024 23:18:13 -0400 From: Sam James <sam@HIDDEN> To: bug-libtool@HIDDEN Subject: Lack of fast-install on Linux proves painful w/ LTO Organization: Gentoo Date: Wed, 14 Aug 2024 04:18:04 +0100 Message-ID: <87le0zg5cj.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" Received-SPF: pass client-ip=140.211.166.183; envelope-from=sam@HIDDEN; helo=smtp.gentoo.org X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -1.6 (-) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -2.6 (--) --=-=-= Content-Type: text/plain Hi! At the moment, it looks like fast-install is disabled on Linux: # This must be glibc/ELF. linux* | k*bsd*-gnu | kopensolaris*-gnu | gnu*) version_type=linux # correct to gnu/linux during the next big refactor need_lib_prefix=no need_version=no ... # This implies no fast_install, which is unacceptable. # Some rework will be needed to allow for fast_install # before this can be enabled. hardcode_into_libs=yes This is particularly painful when using LTO, as you end up with a pretty time-consuming relink for something which is in theory avoidable. (I've tried to follow the logic through but failed. It's not clear to me why Linux needs this opt-out. I'm sure there *is* a reason, I just can't spot it yet.) thanks, sam --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iOUEARYKAI0WIQQlpruI3Zt2TGtVQcJzhAn1IN+RkAUCZrwh7V8UgAAAAAAuAChp c3N1ZXItZnByQG5vdGF0aW9ucy5vcGVucGdwLmZpZnRoaG9yc2VtYW4ubmV0MjVB NkJCODhERDlCNzY0QzZCNTU0MUMyNzM4NDA5RjUyMERGOTE5MA8cc2FtQGdlbnRv by5vcmcACgkQc4QJ9SDfkZC7fAEA0f/qLpJwzok2ZPhNsTceI/Za04Wgf0rQvdAO x75hK6IA/3BML0d5OhCmEC25ltXIius5H9lM3/k9o4AIRKr7tA4K =fERG -----END PGP SIGNATURE----- --=-=-=--
Sam James <sam@HIDDEN>:bug-libtool@HIDDEN.
Full text available.bug-libtool@HIDDEN:bug#72613; Package libtool.
Full text available.
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