[Mingw-w64-public] gcc parameter -mcrtdll= for choosing Windows C RunTime DLL library

[ralph engels]

Mmm yeah i newer seen problems with missing msvcrt.dll either going back 
as far as win9x there was some other missing runtimes but not that 
particular one.

Den 20-11-2022 kl. 16:58 skrev Eli Zaretskii:
>> Date: Sun, 20 Nov 2022 16:44:08 +0100
>> From: Pali Rohár <pali.rohar@gmail.com>
>> Cc: gcc@gcc.gnu.org, mingw-w64-public@lists.sourceforge.net
>>
>>> Installing a redistributable is a nuisance, and dependence on non-system
>>> libraries might make the program non-free.
>> On new windows versions they may be preinstalled (depends on newness of
>> windows version).
> I'm talking about older ones.  It is customary nowadays to build on Windows
> 11 and then run on Windows 8.
>
>> And if your application uses features unavailable in
>> older (or default) crt versions then this make application code
>> simplifier. Also redistributable packages are in most cases installed by
>> Windows update mechanism, which could be marked as system library. But
>> well, this is more license discussion than development discussion...
> I mentioned that because people might inadvertently build GPL'ed GNU
> software using this option, and violate the GPL without knowing it.  This is
> relevant to those who read this list and port GNU software to MS-Windows.
>
>>>> Note that with this option, you can also choose older version than the
>>>> default one (WinXP msvcrt.dll). So e.g. you can choose msvcrt20.dll or
>>>> crtdll.dll for older Windows version.
>>> Using the OS default MSVCRT already gets me that, at zero cost.
>> Here "OS default MSVCRT" means Windows XP MSVCRT.DLL.
>>
>> On older windows versions there is no pre-installed MSVCRT.DLL. There
>> is MSVCRT20.DLL or CRTDLL.DLL (based on oldness of windows version). So
>> it is not at zero cost, you have yo either do that nuisance and install
>> MSVCRT.DLL as you write above or switch to older CRT version which is in
>> OS preinstalled.
> I never saw any problems with programs linked against MSVCRT.DLL, on all
> versions of Windows from XP up to Windows 10.  None.
>
>
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