[FFmpeg-devel] [PATCH] configure: Fix Microsoft tools detection

[Marvin Scholz]

On 3 Feb 2022, at 12:55, Hendrik Leppkes wrote:

> On Thu, Feb 3, 2022 at 12:34 PM Martin Storsjö <martin at martin.st> 
> wrote:
>>
>> On Thu, 3 Feb 2022, Kacper Michajlow wrote:
>>
>>> On Wed, 26 Jan 2022 at 15:00, Martin Storsjö <martin at martin.st> 
>>> wrote:
>>>>
>>>> Hi,
>>>>
>>>> On Sat, 22 Jan 2022, Kacper Michajłow wrote:
>>>>
>>>>> LLVM tools print installation path upon execution. If one uses 
>>>>> LLVM
>>>>> tools bundled with Microsoft Visual Studio installation, they 
>>>>> would be
>>>>> incorrectly detected as Microsoft's ones.
>>>>>
>>>>> Signed-off-by: Kacper Michajłow <kasper93 at gmail.com>
>>>>> ---
>>>>> configure | 6 +++---
>>>>> 1 file changed, 3 insertions(+), 3 deletions(-)
>>>>
>>>> While the patch description seems to make sense, I wanted to try it 
>>>> out to
>>>> see the practical effect for myself, and I fail to observe any 
>>>> difference.
>>>>
>>>> Can you provide your exact configure command line you use, where it 
>>>> makes
>>>> a difference? I tried with "--cc=clang-cl --ld=lld-link 
>>>> --toolchain=msvc"
>>>> and that works just as fine before this patch.
>>>>
>>>> In particular, the commands that you adjust run "$_cc -nologo-" and 
>>>> grep
>>>> for "Microsoft" in the output of that. When I run that with 
>>>> clang-cl, it
>>>> doesn't print a string containing "Microsoft".
>>>>
>>>> // Martin
>>>
>>> Hi,
>>>
>>> Yes you are right. In case of CC it doesn't change anything. 
>>> clang-cl
>>> prints installation dir only with `-v`. The main thing this patch
>>> fixes is `--ar=llvm-ar` where it is mistaken for lib.exe and used 
>>> with
>>> wrong parameters. While fixing this I figured to make CC check also
>>> more strict, because at some point it could be a problem. Sync all 
>>> of
>>> them to have same style as one that was already there
>>
>> Oh, ok, with the reference to llvm-ar, I see what it fixes. Thanks! 
>> The
>> reference to llvm-ar absolutely needs to be in the patch description 
>> then.
>>
>> I remember that there has been some variance throughout the versions 
>> for
>> exactly what MSVC prints as the identification thoughout the 
>> versions, but
>> I think 'Microsoft.*Optimizing.*Compiler' should be safe.
>>
>
> I was wondering if non-english locale would translate that string, but
> I can't easily test that, I don't think.
>

Sorry, need to correct myself. It is indeed localized I was just lacking
the language pack…

For example in german it is:

Microsoft (R) C/C++-Optimierungscompiler Version 19.30.30709 für x64
Copyright (C) Microsoft Corporation. Alle Rechte vorbehalten.

> - Hendrik
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