From unknown Sun Jun 22 19:07:48 2025 X-Loop: help-debbugs@gnu.org Subject: bug#74175: libtool mishandles some compiler flags when used with MSVC tools Resent-From: Kirill Makurin Original-Sender: "Debbugs-submit" Resent-CC: bug-libtool@gnu.org Resent-Date: Sat, 02 Nov 2024 07:52:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 74175 X-GNU-PR-Package: libtool X-GNU-PR-Keywords: To: 74175@debbugs.gnu.org X-Debbugs-Original-To: "bug-libtool@gnu.org" Received: via spool by submit@debbugs.gnu.org id=B.17305338694223 (code B ref -1); Sat, 02 Nov 2024 07:52:02 +0000 Received: (at submit) by debbugs.gnu.org; 2 Nov 2024 07:51:09 +0000 Received: from localhost ([127.0.0.1]:53019 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1t78ua-000163-3J for submit@debbugs.gnu.org; Sat, 02 Nov 2024 03:51:09 -0400 Received: from lists.gnu.org ([209.51.188.17]:56410) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1t78Sn-0000DD-FC for submit@debbugs.gnu.org; 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boundary="_000_LV3PR84MB3820D4D61E4F50A6DBC31197B1572LV3PR84MB3820NAMP_" --_000_LV3PR84MB3820D4D61E4F50A6DBC31197B1572LV3PR84MB3820NAMP_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello, I have encountered a few bugs with libtool when it is used with MSVC tools. I have written a simple dummy project which should demonstrate the bugs. I = uploaded the archive to Google Drive: https://drive.google.com/drive/folder= s/1DPJTid8PG6JjR7MHKKoz_i2QQTRGh8EO The `configure`, `Makefile.in` etc. were generated from Msys2 environment w= ith Autoconf 2.72, Automake 1.17 and libtool 2.5.3. When built with MSVC tools, it will 1) produce a warning from the compiler = (cl.exe) about unrecognized option and 2) fail with error from the linker (= link.exe) about missing input file. I also attached two files containing output from make for comparison. One w= hen used with MSVC tools and another when used with GNU tools. The encountered bugs are as follows: 1. When libtool is used with MSVC tools, libtool's link step mishandles com= piler flags like`-Wl` and `-Xlinker`. For example, `-Wl,-def:FILENAME` beco= mes plain `-def:FILENAME` when libtool invokes the compiler*. (as seen in m= ake-msvc.txt) 2. When producing a DLL, libtool passes `-Fe FILENAME` directly to the comp= iler*. The space between `-Fe` and `FILENAME` prevents cl.exe (and clang-cl= .exe) from treating FILENAME as an output file, but rather as an input file= . * the compiler in question is `path/to/compile cl.exe` which should handle = the usual `-o FILENAME` and flags like `-Wl` correctly with cl.exe The second bug does not appear when libtool creates executables. It also se= ems to appear only in recent versions of libtool, since it does not appear = in existing projects which used older versions of libtool. In older version= s, libtool passes `-o FILENAME` which is handled by `compile` wrapper. - Kirill Makurin --_000_LV3PR84MB3820D4D61E4F50A6DBC31197B1572LV3PR84MB3820NAMP_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hello,

I have encountered a few bugs with libtool when it is used with MSVC tools.=   

I have written a simple dummy project which should demonstrate the bugs. I = uploaded the archive to Google Drive: https://drive.google.com/drive/folders/1DPJTid8PG6JjR7MHKKoz_i2QQTRGh8EO

The `configure`, `Makefile.in` etc. were generated from Msys2 environment w= ith Autoconf 2.72, Automake 1.17 and libtool 2.5.3.

When built with MSVC tools, it will 1) produce a warning from the compiler = (cl.exe) about unrecognized option and 2) fail with error from the linker (= link.exe) about missing input file.

I also attached two files containing output from make for comparison. One w= hen used with MSVC tools and another when used with GNU tools.

The encountered bugs are as follows:

1. When libtool is used with MSVC tools, libtool's link step mishandles com= piler flags like`-Wl` and `-Xlinker`. For example, `-Wl,-def:FILENAME` beco= mes plain `-def:FILENAME` when libtool invokes the compiler*. (as seen in m= ake-msvc.txt)

2. When producing a DLL, libtool passes `-Fe FILENAME` directly to the comp= iler*. The space between `-Fe` and `FILENAME` prevents cl.exe (and clang-cl= .exe) from treating FILENAME as an output file, but rather as an input file= .

* the compiler in question is `path/to/compile cl.exe` which should handle = the usual `-o FILENAME` and flags like `-Wl` correctly with cl.exe

The second bug does not appear when libtool creates executables. It also se= ems to appear only in recent versions of libtool, since it does not appear = in existing projects which used older versions of libtool. In older version= s, libtool passes `-o FILENAME` which is handled by `compile` wrapper.

- Kirill Makurin
--_000_LV3PR84MB3820D4D61E4F50A6DBC31197B1572LV3PR84MB3820NAMP_-- --_005_LV3PR84MB3820D4D61E4F50A6DBC31197B1572LV3PR84MB3820NAMP_ Content-Type: text/plain; name="make-gnu.txt" Content-Description: make-gnu.txt Content-Disposition: attachment; filename="make-gnu.txt"; size=1011; creation-date="Sat, 02 Nov 2024 06:04:21 GMT"; modification-date="Sat, 02 Nov 2024 06:05:11 GMT" Content-Transfer-Encoding: base64 L2Jpbi9zaCAuL2xpYnRvb2wgIC0tdGFnPUNDICAgLS1tb2RlPWNvbXBpbGUgZ2NjIC1ESEFWRV9D T05GSUdfSCAtSS4gLUkvY3lnZHJpdmUvZi9saWJ0b29sLW1zdmMtYnVnICAtRExJQlRPT0xfTVNW Q19CVUdfQlVJTEQgIC1PMiAtRF9GT1JUSUZZX1NPVVJDRT0yIC1nIC1PMiAtYyAtbyBzcmMubG8g L2N5Z2RyaXZlL2YvbGlidG9vbC1tc3ZjLWJ1Zy9zcmMuYwpsaWJ0b29sOiBjb21waWxlOiAgZ2Nj IC1ESEFWRV9DT05GSUdfSCAtSS4gLUkvY3lnZHJpdmUvZi9saWJ0b29sLW1zdmMtYnVnIC1ETElC VE9PTF9NU1ZDX0JVR19CVUlMRCAtTzIgLURfRk9SVElGWV9TT1VSQ0U9MiAtZyAtTzIgLWMgL2N5 Z2RyaXZlL2YvbGlidG9vbC1tc3ZjLWJ1Zy9zcmMuYyAgLURETExfRVhQT1JUIC1EUElDIC1vIC5s 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--_005_LV3PR84MB3820D4D61E4F50A6DBC31197B1572LV3PR84MB3820NAMP_-- From unknown Sun Jun 22 19:07:48 2025 X-Loop: help-debbugs@gnu.org Subject: bug#74175: libtool mishandles some compiler flags when used with MSVC tools Resent-From: Ileana Dumitrescu Original-Sender: "Debbugs-submit" Resent-CC: bug-libtool@gnu.org Resent-Date: Wed, 13 Nov 2024 20:01:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 74175 X-GNU-PR-Package: libtool X-GNU-PR-Keywords: To: Kirill Makurin , 74175@debbugs.gnu.org Received: via spool by 74175-submit@debbugs.gnu.org id=B74175.17315280241036 (code B ref 74175); Wed, 13 Nov 2024 20:01:01 +0000 Received: (at 74175) by debbugs.gnu.org; 13 Nov 2024 20:00:24 +0000 Received: from localhost ([127.0.0.1]:43737 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1tBJXL-0000Gd-Lb for submit@debbugs.gnu.org; Wed, 13 Nov 2024 15:00:24 -0500 Received: from mail-ej1-f53.google.com 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boundary="------------ua4j4GSCW7zc7FlOXh8bwFcH" X-Spam-Score: 0.3 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -0.7 (/) This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------ua4j4GSCW7zc7FlOXh8bwFcH Content-Type: multipart/mixed; boundary="------------tribcNOoSLeByU0xL4LdUdeU"; protected-headers="v1" From: Ileana Dumitrescu To: Kirill Makurin , 74175@debbugs.gnu.org Message-ID: Subject: Re: bug#74175: libtool mishandles some compiler flags when used with MSVC tools References: In-Reply-To: --------------tribcNOoSLeByU0xL4LdUdeU Content-Type: multipart/mixed; boundary="------------oP0nEXC2jiwg0UFsnNDuKB9F" --------------oP0nEXC2jiwg0UFsnNDuKB9F Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64 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(Re: bug#74175: libtool mishandles some compiler flags when used with MSVC tools) Message-ID: References: <0b8f6ee1-1aa5-40d4-9f07-bf050e9772cc@gmail.com> X-Gnu-PR-Message: they-closed 74175 X-Gnu-PR-Package: libtool Reply-To: 74175@debbugs.gnu.org Date: Thu, 29 May 2025 17:26:03 +0000 Content-Type: multipart/mixed; boundary="----------=_1748539563-15914-1" This is a multi-part message in MIME format... ------------=_1748539563-15914-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Your bug report #74175: libtool mishandles some compiler flags when used with MSVC tools which was filed against the libtool package, has been closed. The explanation is attached below, along with your original report. If you require more details, please reply to 74175@debbugs.gnu.org. --=20 74175: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D74175 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems ------------=_1748539563-15914-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at 74175-done) by debbugs.gnu.org; 29 May 2025 17:25:09 +0000 Received: from localhost ([127.0.0.1]:38398 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1uKh09-00043E-26 for submit@debbugs.gnu.org; Thu, 29 May 2025 13:25:09 -0400 Received: from mail-ed1-x535.google.com ([2a00:1450:4864:20::535]:41188) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.84_2) (envelope-from ) id 1uKh07-0003ym-DD for 74175-done@debbugs.gnu.org; Thu, 29 May 2025 13:25:08 -0400 Received: by mail-ed1-x535.google.com with SMTP id 4fb4d7f45d1cf-6041b38c94aso220921a12.0 for <74175-done@debbugs.gnu.org>; Thu, 29 May 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X-Google-Smtp-Source: AGHT+IFaFMQDYD/cScR0UnaAmdbWjFwtKB6DttrFG5FjyjkPDzdzjadwAlpmRr9D40unBPTsoKgkOA== X-Received: by 2002:a05:6402:270c:b0:5ff:9994:92d3 with SMTP id 4fb4d7f45d1cf-6056db0ec07mr59581a12.2.1748539500858; Thu, 29 May 2025 10:25:00 -0700 (PDT) Received: from [192.168.254.128] ([95.214.217.107]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-60566c740e7sm267083a12.36.2025.05.29.10.24.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 29 May 2025 10:25:00 -0700 (PDT) Message-ID: <0b8f6ee1-1aa5-40d4-9f07-bf050e9772cc@gmail.com> Date: Thu, 29 May 2025 20:24:56 +0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: bug#74175: libtool mishandles some compiler flags when used with MSVC tools From: Ileana Dumitrescu To: 74175-done@debbugs.gnu.org References: Content-Language: en-US Autocrypt: addr=ileanadumitrescu95@gmail.com; keydata= xsFNBGFMu5ABEACpFrPCKpfsTSl4svqi91Hsf8gGtdKwndgXqMPJNqBXEJCCwiiUPnS68wNW 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Re: bug#74175: libtool mishandles some compiler flags when used with MSVC tools References: In-Reply-To: --------------8D7088rZtd0t1bh7CmbT7j7x Content-Type: multipart/mixed; boundary="------------Id6zXAUouTru8HKeuhTzrmTp" --------------Id6zXAUouTru8HKeuhTzrmTp Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64 T24gMTMvMTEvMjAyNCAyMTo1OSwgSWxlYW5hIER1bWl0cmVzY3Ugd3JvdGU6DQo+IEhpIEtp cmlsbCwNCj4gDQo+IE9uIDAyLzExLzIwMjQgMDk6MTcsIEtpcmlsbCBNYWt1cmluIHdyb3Rl Og0KPj4gVGhlIGVuY291bnRlcmVkIGJ1Z3MgYXJlIGFzIGZvbGxvd3M6DQo+Pg0KPj4gMS4g V2hlbiBsaWJ0b29sIGlzIHVzZWQgd2l0aCBNU1ZDIHRvb2xzLCBsaWJ0b29sJ3MgbGluayBz dGVwIA0KPj4gbWlzaGFuZGxlcyBjb21waWxlciBmbGFncyBsaWtlYC1XbGAgYW5kIGAtWGxp bmtlcmAuIEZvciBleGFtcGxlLCBgLSANCj4+IFdsLC0gZGVmOkZJTEVOQU1FYCBiZWNvbWVz IHBsYWluIGAtZGVmOkZJTEVOQU1FYCB3aGVuIGxpYnRvb2wgaW52b2tlcyANCj4+IHRoZSBj b21waWxlciouIChhcyBzZWVuIGluIG1ha2UtbXN2Yy50eHQpDQoNClRoaXMgcGFydCBvZiB0 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List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.3 (--) --_005_LV3PR84MB3820D4D61E4F50A6DBC31197B1572LV3PR84MB3820NAMP_ Content-Type: multipart/alternative; boundary="_000_LV3PR84MB3820D4D61E4F50A6DBC31197B1572LV3PR84MB3820NAMP_" --_000_LV3PR84MB3820D4D61E4F50A6DBC31197B1572LV3PR84MB3820NAMP_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello, I have encountered a few bugs with libtool when it is used with MSVC tools. I have written a simple dummy project which should demonstrate the bugs. I = uploaded the archive to Google Drive: https://drive.google.com/drive/folder= s/1DPJTid8PG6JjR7MHKKoz_i2QQTRGh8EO The `configure`, `Makefile.in` etc. were generated from Msys2 environment w= ith Autoconf 2.72, Automake 1.17 and libtool 2.5.3. When built with MSVC tools, it will 1) produce a warning from the compiler = (cl.exe) about unrecognized option and 2) fail with error from the linker (= link.exe) about missing input file. I also attached two files containing output from make for comparison. One w= hen used with MSVC tools and another when used with GNU tools. The encountered bugs are as follows: 1. When libtool is used with MSVC tools, libtool's link step mishandles com= piler flags like`-Wl` and `-Xlinker`. For example, `-Wl,-def:FILENAME` beco= mes plain `-def:FILENAME` when libtool invokes the compiler*. (as seen in m= ake-msvc.txt) 2. When producing a DLL, libtool passes `-Fe FILENAME` directly to the comp= iler*. The space between `-Fe` and `FILENAME` prevents cl.exe (and clang-cl= .exe) from treating FILENAME as an output file, but rather as an input file= . * the compiler in question is `path/to/compile cl.exe` which should handle = the usual `-o FILENAME` and flags like `-Wl` correctly with cl.exe The second bug does not appear when libtool creates executables. It also se= ems to appear only in recent versions of libtool, since it does not appear = in existing projects which used older versions of libtool. In older version= s, libtool passes `-o FILENAME` which is handled by `compile` wrapper. - Kirill Makurin --_000_LV3PR84MB3820D4D61E4F50A6DBC31197B1572LV3PR84MB3820NAMP_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hello,

I have encountered a few bugs with libtool when it is used with MSVC tools.=   

I have written a simple dummy project which should demonstrate the bugs. I = uploaded the archive to Google Drive: https://drive.google.com/drive/folders/1DPJTid8PG6JjR7MHKKoz_i2QQTRGh8EO

The `configure`, `Makefile.in` etc. were generated from Msys2 environment w= ith Autoconf 2.72, Automake 1.17 and libtool 2.5.3.

When built with MSVC tools, it will 1) produce a warning from the compiler = (cl.exe) about unrecognized option and 2) fail with error from the linker (= link.exe) about missing input file.

I also attached two files containing output from make for comparison. One w= hen used with MSVC tools and another when used with GNU tools.

The encountered bugs are as follows:

1. When libtool is used with MSVC tools, libtool's link step mishandles com= piler flags like`-Wl` and `-Xlinker`. For example, `-Wl,-def:FILENAME` beco= mes plain `-def:FILENAME` when libtool invokes the compiler*. (as seen in m= ake-msvc.txt)

2. When producing a DLL, libtool passes `-Fe FILENAME` directly to the comp= iler*. The space between `-Fe` and `FILENAME` prevents cl.exe (and clang-cl= .exe) from treating FILENAME as an output file, but rather as an input file= .

* the compiler in question is `path/to/compile cl.exe` which should handle = the usual `-o FILENAME` and flags like `-Wl` correctly with cl.exe

The second bug does not appear when libtool creates executables. It also se= ems to appear only in recent versions of libtool, since it does not appear = in existing projects which used older versions of libtool. In older version= s, libtool passes `-o FILENAME` which is handled by `compile` wrapper.

- Kirill Makurin
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boundary="_004_DM4PR84MB13732B2989BE083B37B1EB60B16FADM4PR84MB1373NAMP_" MIME-Version: 1.0 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM4PR84MB1373.NAMPRD84.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: 9927fa4b-7a7a-417e-fcba-08dda417825a X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Jun 2025 09:58:23.4609 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR84MB2109 X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -1.0 (-) --_004_DM4PR84MB13732B2989BE083B37B1EB60B16FADM4PR84MB1373NAMP_ Content-Type: multipart/alternative; boundary="_000_DM4PR84MB13732B2989BE083B37B1EB60B16FADM4PR84MB1373NAMP_" --_000_DM4PR84MB13732B2989BE083B37B1EB60B16FADM4PR84MB1373NAMP_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Ileana, The fix seems incomplete. See attached file for `libtool --mode=3Dlink` invocation with clang-cl. You= may notice that the flag passed with -Wl is passed twice: once on its own = (just like it was with cl.exe with the bug) and once properly with -Wl. Do you think checking compiler's name is a good idea? AFAIK, all three of c= l.exe, clang-cl.exe and icl.exe (MSVC-like compilers handled by Automake's = `compile` wrapper) define _MSC_VER macro. If libtool does check, it should = be at least consistent with `compile` wrapper. Maybe libtool could check during configuration whether compiler defines thi= s macro to decide how to pass linker flags? Since `compile` wrapper should = usually be involved, we need to just pass -Wl flags and friends as is, `com= pile` takes care of them. There is one problematic case though. If we would use clang.exe installed w= ith Visual Studio, this will not work. It defines _MSC_VER, but it usus gcc= -like command line options. - Kirill Makurin ________________________________ From: Ileana Dumitrescu Sent: Friday, May 30, 2025 2:24 AM To: 74175-done@debbugs.gnu.org Cc: Kirill Makurin Subject: Re: bug#74175: libtool mishandles some compiler flags when used wi= th MSVC tools On 13/11/2024 21:59, Ileana Dumitrescu wrote: > Hi Kirill, > > On 02/11/2024 09:17, Kirill Makurin wrote: >> The encountered bugs are as follows: >> >> 1. When libtool is used with MSVC tools, libtool's link step >> mishandles compiler flags like`-Wl` and `-Xlinker`. For example, `- >> Wl,- def:FILENAME` becomes plain `-def:FILENAME` when libtool invokes >> the compiler*. (as seen in make-msvc.txt) This part of the bug report has a patch applied [1] in the development branch now, which should migrate to master after some more time. MSVC building and testing has greatly improved, so I will hopefully get another stable release with these fixes out in a couple months. [1]https://cgit.git.savannah.gnu.org/cgit/libtool.git/commit/?h=3Ddevelopme= nt&id=3D4ded381a6f09cb761a05403450b5e34fec945f5a -- Ileana Dumitrescu GPG Public Key: FA26 CA78 4BE1 8892 7F22 B99F 6570 EA01 146F 7354 --_000_DM4PR84MB13732B2989BE083B37B1EB60B16FADM4PR84MB1373NAMP_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Ileana,

The fix seems incomplete.

See attached file for `libtool --mode=3Dlink` invocation with clang-cl. You= may notice that the flag passed with -Wl is passed twice: once on its own = (just like it was with cl.exe with the bug) and once properly with -Wl.

Do you think checking compiler's name is a good idea? AFAIK, all three of c= l.exe, clang-cl.exe and icl.exe (MSVC-like compilers handled by Automake's = `compile` wrapper) define _MSC_VER macro. If libtool does check, it should = be at least consistent with `compile` wrapper.

Maybe libtool could check during configuration whether compiler d= efines this macro to decide how to pass linker flags? Since `compile` wrapp= er should usually be involved, we need to just pass -Wl flags and friends a= s is, `compile` takes care of them.

There is one problematic case though. If we would use clang.exe installed w= ith Visual Studio, this will not work. It defines _MSC_VER, but it usus gcc= -like command line options.

- Kirill Makurin


From: Ileana Dumitrescu
Sent: Friday, May 30, 2025 2:24 AM
To: 74175-done@debbugs.gnu.org
Cc: Kirill Makurin
Subject: Re: bug#74175: libtool mishandles some compiler flags = when used with MSVC tools

On 13/11/2024 21:5= 9, Ileana Dumitrescu wrote:
> Hi Kirill,
>
> On 02/11/2024 09:17, Kirill Makurin wrote:
>> The encountered bugs are as follows:
>>
>> 1. When libtool is used with MSVC tools, libtool's link step
>> mishandles compiler flags like`-Wl` and `-Xlinker`. For example, `= -
>> Wl,- def:FILENAME` becomes plain `-def:FILENAME` when libtool invo= kes
>> the compiler*. (as seen in make-msvc.txt)

This part of the bug report has a patch applied [1] in the development
branch now, which should migrate to master after some more time. MSVC
building and testing has greatly improved, so I will hopefully get
another stable release with these fixes out in a couple months.

[1]https://cgit.git.savannah.gnu.org/cgit/libtool.git/commit/?h=3Ddevelopme= nt&id=3D4ded381a6f09cb761a05403450b5e34fec945f5a

--
Ileana Dumitrescu

GPG Public Key: FA26 CA78 4BE1 8892 7F22 B99F 6570 EA01 146F 7354

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charset="us-ascii" Content-Transfer-Encoding: quoted-printable I am actually wrong. If we would pass -Wl and friends as is to clang.exe it= would handle them correctly by itself. Note: clang.exe installed with Visual Studio uses link.exe, just like cl.ex= e would. What do you think about checking whether compiler defines _MSC_VER macro? - Kirill Makurin ________________________________ From: bug-libtool-bounces+maiddaisuki=3Doutlook.com@gnu.org on behalf of Kirill Makurin Sent: Thursday, June 5, 2025 6:58 PM To: Ileana Dumitrescu ; 74175@debbugs.gnu.org= <74175@debbugs.gnu.org> Subject: bug#74175: libtool mishandles some compiler flags when used with M= SVC tools Hi Ileana, The fix seems incomplete. See attached file for `libtool --mode=3Dlink` invocation with clang-cl. You= may notice that the flag passed with -Wl is passed twice: once on its own = (just like it was with cl.exe with the bug) and once properly with -Wl. Do you think checking compiler's name is a good idea? AFAIK, all three of c= l.exe, clang-cl.exe and icl.exe (MSVC-like compilers handled by Automake's = `compile` wrapper) define _MSC_VER macro. If libtool does check, it should = be at least consistent with `compile` wrapper. Maybe libtool could check during configuration whether compiler defines thi= s macro to decide how to pass linker flags? Since `compile` wrapper should = usually be involved, we need to just pass -Wl flags and friends as is, `com= pile` takes care of them. There is one problematic case though. If we would use clang.exe installed w= ith Visual Studio, this will not work. It defines _MSC_VER, but it usus gcc= -like command line options. - Kirill Makurin ________________________________ From: Ileana Dumitrescu Sent: Friday, May 30, 2025 2:24 AM To: 74175-done@debbugs.gnu.org Cc: Kirill Makurin Subject: Re: bug#74175: libtool mishandles some compiler flags when used wi= th MSVC tools On 13/11/2024 21:59, Ileana Dumitrescu wrote: > Hi Kirill, > > On 02/11/2024 09:17, Kirill Makurin wrote: >> The encountered bugs are as follows: >> >> 1. When libtool is used with MSVC tools, libtool's link step >> mishandles compiler flags like`-Wl` and `-Xlinker`. For example, `- >> Wl,- def:FILENAME` becomes plain `-def:FILENAME` when libtool invokes >> the compiler*. (as seen in make-msvc.txt) This part of the bug report has a patch applied [1] in the development branch now, which should migrate to master after some more time. MSVC building and testing has greatly improved, so I will hopefully get another stable release with these fixes out in a couple months. [1]https://cgit.git.savannah.gnu.org/cgit/libtool.git/commit/?h=3Ddevelopme= nt&id=3D4ded381a6f09cb761a05403450b5e34fec945f5a -- Ileana Dumitrescu GPG Public Key: FA26 CA78 4BE1 8892 7F22 B99F 6570 EA01 146F 7354 --_000_DM4PR84MB1373F0A8F68FE2D73643FA47B16FADM4PR84MB1373NAMP_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
I am actually wrong. If we would pass -Wl and friends as is to clang.exe it= would handle them correctly by itself.

Note: clang.exe installed with Visual Studio uses link.exe, just like cl.ex= e would.

What do you think about checking whether compiler defines _MSC_VER macro?

- Kirill Makurin 
From: bug-libtool-bounces+m= aiddaisuki=3Doutlook.com@gnu.org <bug-libtool-bounces+maiddaisuki=3Doutl= ook.com@gnu.org> on behalf of Kirill Makurin <maiddaisuki@outlook.com= >
Sent: Thursday, June 5, 2025 6:58 PM
To: Ileana Dumitrescu <ileanadumitrescu95@gmail.com>; 74175@de= bbugs.gnu.org <74175@debbugs.gnu.org>
Subject: bug#74175: libtool mishandles some compiler flags when used= with MSVC tools
 
Hi Ileana,

The fix seems incomplete.

See attached file for `libtool --mode=3Dlink` invocation with clang-cl. You= may notice that the flag passed with -Wl is passed twice: once on its own = (just like it was with cl.exe with the bug) and once properly with -Wl.

Do you think checking compiler's name is a good idea? AFAIK, all three of c= l.exe, clang-cl.exe and icl.exe (MSVC-like compilers handled by Automake's = `compile` wrapper) define _MSC_VER macro. If libtool does check, it should = be at least consistent with `compile` wrapper.

Maybe libtool could check during configuration whether compiler d= efines this macro to decide how to pass linker flags? Since `compile` wrapp= er should usually be involved, we need to just pass -Wl flags and friends a= s is, `compile` takes care of them.

There is one problematic case though. If we would use clang.exe installed w= ith Visual Studio, this will not work. It defines _MSC_VER, but it usus gcc= -like command line options.

- Kirill Makurin


From: Ileana Dumitrescu
Sent: Friday, May 30, 2025 2:24 AM
To: 74175-done@debbugs.gnu.org
Cc: Kirill Makurin
Subject: Re: bug#74175: libtool mishandles some compiler flags = when used with MSVC tools

On 13/11/2024 21:5= 9, Ileana Dumitrescu wrote:
> Hi Kirill,
>
> On 02/11/2024 09:17, Kirill Makurin wrote:
>> The encountered bugs are as follows:
>>
>> 1. When libtool is used with MSVC tools, libtool's link step
>> mishandles compiler flags like`-Wl` and `-Xlinker`. For example, `= -
>> Wl,- def:FILENAME` becomes plain `-def:FILENAME` when libtool invo= kes
>> the compiler*. (as seen in make-msvc.txt)

This part of the bug report has a patch applied [1] in the development
branch now, which should migrate to master after some more time. MSVC
building and testing has greatly improved, so I will hopefully get
another stable release with these fixes out in a couple months.

[1]https://cgit.git.savannah.gnu.org/cgit/libtool.git/commit/?h=3Ddevelopme= nt&id=3D4ded381a6f09cb761a05403450b5e34fec945f5a

--
Ileana Dumitrescu

GPG Public Key: FA26 CA78 4BE1 8892 7F22 B99F 6570 EA01 146F 7354

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protected-headers="v1" From: Ileana Dumitrescu To: "74175@debbugs.gnu.org" <74175@debbugs.gnu.org> Cc: Kirill Makurin Message-ID: Subject: Re: bug#74175: libtool mishandles some compiler flags when used with MSVC tools References: <0b8f6ee1-1aa5-40d4-9f07-bf050e9772cc@gmail.com> In-Reply-To: --------------SVNBNmXXh1Hdz044PqmA1lhw Content-Type: multipart/mixed; boundary="------------WvTxgHECPsPzOxsuh1sKpHAJ" --------------WvTxgHECPsPzOxsuh1sKpHAJ Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64 T24gMDUvMDYvMjAyNSAxMzowOSwgS2lyaWxsIE1ha3VyaW4gd3JvdGU6DQo+IEkgYW0gYWN0 dWFsbHkgd3JvbmcuIElmIHdlIHdvdWxkIHBhc3MgLVdsIGFuZCBmcmllbmRzIGFzIGlzIHRv IGNsYW5nLmV4ZSANCj4gaXQgd291bGQgaGFuZGxlIHRoZW0gY29ycmVjdGx5IGJ5IGl0c2Vs Zi4NCj4gDQo+IE5vdGU6IGNsYW5nLmV4ZSBpbnN0YWxsZWQgd2l0aCBWaXN1YWwgU3R1ZGlv IHVzZXMgbGluay5leGUsIGp1c3QgbGlrZSANCj4gY2wuZXhlIHdvdWxkLg0KDQpUaGFuayB5 b3UgZm9yIHRoZSB1cGRhdGVzLiBJcyB0aGlzIGFuIGlzc3VlIHNwZWNpZmljYWxseSB3aXRo 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Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -1.0 (-) --_000_DM4PR84MB1373897E9C69264214461C55B16FADM4PR84MB1373NAMP_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Yes, this issue appears only with clang-cl.exe. The issue has been fixed fo= r cl.exe. I do not have icl.exe to test it, unfortunately. - Kirill Makurin ________________________________ From: Ileana Dumitrescu Sent: Friday, June 6, 2025 1:13 AM To: 74175@debbugs.gnu.org Cc: Kirill Makurin Subject: Re: bug#74175: libtool mishandles some compiler flags when used wi= th MSVC tools On 05/06/2025 13:09, Kirill Makurin wrote: > I am actually wrong. If we would pass -Wl and friends as is to clang.exe > it would handle them correctly by itself. > > Note: clang.exe installed with Visual Studio uses link.exe, just like > cl.exe would. Thank you for the updates. Is this an issue specifically with clang-cl? I believe the issue is fixed with cl/cl.exe in development. > What do you think about checking whether compiler defines _MSC_VER macro? I do not have a strong opinion on this, so it could be added. Could you submit a patch for review? > - Kirill Makurin > ------------------------------------------------------------------------ > *From:* bug-libtool-bounces+maiddaisuki=3Doutlook.com@gnu.org libtool-bounces+maiddaisuki=3Doutlook.com@gnu.org> on behalf of Kirill > Makurin > *Sent:* Thursday, June 5, 2025 6:58 PM > *To:* Ileana Dumitrescu ; > 74175@debbugs.gnu.org <74175@debbugs.gnu.org> > *Subject:* bug#74175: libtool mishandles some compiler flags when used > with MSVC tools > Hi Ileana, > > The fix seems incomplete. > > See attached file for `libtool --mode=3Dlink` invocation with clang-cl. > You may notice that the flag passed with -Wl is passed twice: once on > its own (just like it was with cl.exe with the bug) and once properly > with -Wl. > > Do you think checking compiler's name is a good idea? AFAIK, all three > of cl.exe, clang-cl.exe and icl.exe (MSVC-like compilers handled by > Automake's `compile` wrapper) define _MSC_VER macro. If libtool does > check, it should be at least consistent with `compile` wrapper. There are checks for compilers in libtool, like "cl* | icl*)" for cc_basename when on a windows-like system. If libtool's configuration when using clang-cl.exe is incorrect, these could be updated to avoid clang-cl.exe or a new check could be added for the needed configuration. > Maybe libtool could check during configuration whether compiler defines > this macro to decide how to pass linker flags? Since `compile` wrapper > should usually be involved, we need to just pass -Wl flags and friends > as is, `compile` takes care of them. > > There is one problematic case though. If we would use clang.exe > installed with Visual Studio, this will not work. It defines _MSC_VER, > but it usus gcc-like command line options. -- Ileana Dumitrescu GPG Public Key: FA26 CA78 4BE1 8892 7F22 B99F 6570 EA01 146F 7354 --_000_DM4PR84MB1373897E9C69264214461C55B16FADM4PR84MB1373NAMP_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Yes, this issue appears only with clang-cl.exe. The issue has been fixed fo= r cl.exe.

I do not have icl.exe to test it, unfortunately.

- Kirill Makurin


From: Ileana Dumitrescu
Sent: Friday, June 6, 2025 1:13 AM
To: 74175@debbugs.gnu.org
Cc: Kirill Makurin
Subject: Re: bug#74175: libtool mishandles some compiler flags = when used with MSVC tools

On 05/06/2025 13:09, Kirill Makurin wrote:<= br> > I am actually wrong. If we would pass -Wl and friends as is to clang.e= xe
> it would handle them correctly by itself.
>
> Note: clang.exe installed with Visual Studio uses link.exe, just like<= br> > cl.exe would.

Thank you for the updates. Is this an issue specifically with clang-cl?
I believe the issue is fixed with cl/cl.exe in development.

> What do you think about checking whether compiler defines _MSC_VER mac= ro?

I do not have a strong opinion on this, so it could be added. Could you
submit a patch for review?

> - Kirill Makurin
> ----------------------------------------------------------------------= --
> *From:* bug-libtool-bounces+maiddaisuki=3Doutlook.com@gnu.org <bug-=
> libtool-bounces+maiddaisuki=3Doutlook.com@gnu.org> on behalf of Kir= ill
> Makurin <maiddaisuki@outlook.com>
> *Sent:* Thursday, June 5, 2025 6:58 PM
> *To:* Ileana Dumitrescu <ileanadumitrescu95@gmail.com>;
> 74175@debbugs.gnu.org <74175@debbugs.gnu.org>
> *Subject:* bug#74175: libtool mishandles some compiler flags when used=
> with MSVC tools
> Hi Ileana,
>
> The fix seems incomplete.
>
> See attached file for `libtool --mode=3Dlink` invocation with clang-cl= .
> You may notice that the flag passed with -Wl is passed twice: once on<= br> > its own (just like it was with cl.exe with the bug) and once properly<= br> > with -Wl.
>
> Do you think checking compiler's name is a good idea? AFAIK, all three=
> of cl.exe, clang-cl.exe and icl.exe (MSVC-like compilers handled by > Automake's `compile` wrapper) define _MSC_VER macro. If libtool does > check, it should be at least consistent with `compile` wrapper.

There are checks for compilers in libtool, like "cl* | icl*)" for=
cc_basename when on a windows-like system. If libtool's configuration
when using clang-cl.exe is incorrect, these could be updated to avoid
clang-cl.exe or a new check could be added for the needed configuration.
> Maybe libtool could check during configuration whether compi= ler defines
> this macro to decide how to pass linker flags? Since `compile` wrapper=
> should usually be involved, we need to just pass -Wl flags and friends=
> as is, `compile` takes care of them.
>
> There is one problematic case though. If we would use clang.exe
> installed with Visual Studio, this will not work. It defines _MSC_VER,=
> but it usus gcc-like command line options.

--
Ileana Dumitrescu

GPG Public Key: FA26 CA78 4BE1 8892 7F22 B99F 6570 EA01 146F 7354

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