From unknown Sun Jun 22 19:06:34 2025 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) Content-Type: text/plain; charset=utf-8 From: bug#74175 <74175@debbugs.gnu.org> To: bug#74175 <74175@debbugs.gnu.org> Subject: Status: libtool mishandles some compiler flags when used with MSVC tools Reply-To: bug#74175 <74175@debbugs.gnu.org> Date: Mon, 23 Jun 2025 02:06:34 +0000 retitle 74175 libtool mishandles some compiler flags when used with MSVC to= ols reassign 74175 libtool submitter 74175 Kirill Makurin severity 74175 normal thanks From debbugs-submit-bounces@debbugs.gnu.org Sat Nov 02 03:51:09 2024 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="_005_LV3PR84MB3820D4D61E4F50A6DBC31197B1572LV3PR84MB3820NAMP_" MIME-Version: 1.0 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: LV3PR84MB3820.NAMPRD84.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: 8dc695b9-dbc5-4e96-71f4-08dcfb0e5f6b X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Nov 2024 07:17:12.8164 (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: DM3PR84MB3659 Received-SPF: pass client-ip=40.92.18.87; envelope-from=maiddaisuki@outlook.com; helo=NAM11-CO1-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -1.3 (-) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Sat, 02 Nov 2024 03:51:07 -0400 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: -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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Nov 2024 21:59:16 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: bug#74175: libtool mishandles some compiler flags when used with MSVC tools To: Kirill Makurin , 74175@debbugs.gnu.org References: Content-Language: en-US From: Ileana Dumitrescu Autocrypt: addr=ileanadumitrescu95@gmail.com; keydata= xsFNBGFMu5ABEACpFrPCKpfsTSl4svqi91Hsf8gGtdKwndgXqMPJNqBXEJCCwiiUPnS68wNW ae54So04zVAcXewFdM36GypUGep5bhdgvbVKaDCrhNRdAoZ0VAywgU9CDCAa3v8eXUSrlGon k/ygjLIMnkOSjIMls4+z0FOpvsd1IcgcBDU5S6DSAF/Sb8w9bF2yD7f5RaLN6++EJEO2Bp+8 v4qCJEUGzi5QJKXHVUTGiTirx50eLIkw0HseLVOiJoU0NRRgzK/q04+X/NuOAPnZm5K3GOJU mKmG7M2tdMhhGT7UjF3XiI0MwydGIrPU1T1OdPBnXv6ajRYzLgIZl0GsGeFo5qFaFmRtNO7n CGi/5XtivM1WvbqXIQmsAmpm8N/uEcPcuP+0+7s1o0JC+c4nbHlQyvUFSZVgbZQ+mSn6GXRP NfL7AeDSINXXvXDv5vkHN+FbFggx5nWg8J5a33hxbnZoR/qTfDBQHF3mJMF3lesXibN+oLvw OVtlIffKc4jwjLKL40644eQfbhHjCE1AXGQjUGCE5vAkCxEqWH2nQbXIedijQD/5mufaCQX3 Rl314FBfyV1b9rIHxJYRLXHT83+om7y5ncYI5sdoY7/g/Ggmi0PuuUicax/ejOx4nNtDgDxl 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multipart/mixed; boundary="------------8D7088rZtd0t1bh7CmbT7j7x"; protected-headers="v1" From: Ileana Dumitrescu To: 74175-done@debbugs.gnu.org Cc: Kirill Makurin Message-ID: <0b8f6ee1-1aa5-40d4-9f07-bf050e9772cc@gmail.com> Subject: 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 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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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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: SA1PR84MB3213 X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 74175 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 (-) --_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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