Path: csiph.com!eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail
From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: Why does C allow structs to have a tag?
Date: Fri, 30 Jul 2021 16:36:48 -0700
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Bart <bc@freeuk.com> writes:
> On 30/07/2021 23:34, Keith Thompson wrote:
>> Bart <bc@freeuk.com> writes:
>> [...]
>>> For the record, my current 'gcc' that I use on plain Windows is this
>>> product:
>>>
>>> https://jmeubank.github.io/tdm-gcc/download/
>> https://jmeubank.github.io/tdm-gcc/about/ :
>>      TDM-GCC is a compiler suite for Windows.
>>      It combines the most recent stable release of the GCC compiler,
>> a
>>      few patches for Windows-friendliness, and the free and open-source
>>      MinGW.org or MinGW-w64 runtime APIs, to create a more lightweight
>>      open-source alternative to Microsoft’s compiler and platform SDK.
>> TDM-GCC is not a compiler.
>> TDM-GCC is not gcc.
>> TDM-GCC is not produced or maintained by the gcc project.
>> TDM-GCC is a software package that combines a compiler (gcc) and
>> other
>> components (MinGW runtime libraries, probably other things) into a C
>> implementation.
>> Other software packages might combine the gcc compiler with other
>> runtime library implementations.  For example, there are packages that
>> combine the gcc compiler with Microsoft's runtime library.
>> If any of the above is inaccurate, Bart, I encourage you to correct
>> me.
>> You seem to imply that TDM-GCC gives you an implementation that by
>> default uses the obsolete MSVCRT.DLL, and therefore does not support
>> "%zu".  I find that at least mildly surprising.  I might install it
>> myself over the weekend to see what's going on.
>
> C:\c>type c.c
> #include <stdio.h>
> int main(void) {
>     printf("Hello, World! %zu\n",sizeof(void*));
> }
>
> C:\c>gcc --version
> gcc (tdm64-1) 9.2.0
> <snip>
>
> C:\c>gcc c.c
>
> C:\c>a
> Hello, World! zu
>
> C:\c>gcc c.c -lucrt
>
> C:\c>a
> Hello, World! 8
>
> C:\c>gcc c.c \tdm\x86_64-w64-mingw32\lib\libmsvcrt.a
>
> C:\c>a
> Hello, World! zu
>
> C:\c>

OK, that demonstrates that TDM-GCC by default does not support "%zu".
It doesn't directly demonstrate that it uses MSVCRT.DLL, but that's
probably the most likely explanation.

Did you want to reply to anything else I wrote?  Should I assume that
you agree with the points I made above?  (I would greatly appreciate a
direct reply to that last question.)

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Philips
void Void(void) { Void(); } /* The recursive call of the void */