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From: lemkemch AT t-online DOT de
Subject: Re: mingw-targeted cross-compiler question
Date: Wed, 22 Dec 2010 15:26:32 +0100
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On Wed, 22 Dec 2010 15:11:18 +0100, Kai Tietz <ktietz70 AT googlemail DOT com>  
wrote:

> 2010/12/22  <lemkemch AT t-online DOT de>:
>> On Wed, 22 Dec 2010 14:13:15 +0100, Frédéric Bron  
>> <frederic DOT bron AT m4x DOT org>
>> wrote:
>>
>>>>>> I checked the Make file, it used this flag:
>>>>>> gcc -mno-cygwin -g -Wl,--add-stdcall-alias -Wl,--export-all-symbols  
>>>>>> ...
>>>>>
>>>>> replace gcc by gcc-3
>>>>> gcc 4 is now the default on cygwin but the cross compiler is not
>>>>> supported for that version.
>>>>> Frédéric
>>>>
>>>> What do you mean by not supported?  JonY maintains the cross
>>>> compilers....
>>>
>>> I meant that i686-w64-mingw32-gcc exists but not i686-w32-mingw32-gcc.
>>> I thought that w64 meant "built on win64" and mingw32 "run binary on
>>> win32".
>>> So it seems to me that with cygwin running on a 32 bit windows, it is
>>> not possible to cross compile to win32. However with a 64 bit windows
>>> you can produce win32 applications.
>>> However, I just tried to use i686-w64-mingw32-g++ on my win32 machine
>>> with a hello world program and it produces an binary that can be used
>>> from windows on that win32 machine.
>>> So my question to the list: what is the meaning of w64 in the name?
>>
>> Well, I don't know but I'd really like to know what is the replacement
>> these days for
>>
>> gcc -mno-cygwin -mwindows x.c
>>
>> I tried
>>
>> i686-w64-mingw32-gcc -mwindows  -m32 x.c
>>
>> but get
>>
>> x.c:35:13: error: expected '=', ',', ';', 'asm' or '__attribute__'  
>> before
>> 'WinMain'
>>
>> and that also for all other option combinations that made sense to me.
>>
>> Thanks,
>> Michael
>
> Hi,
>
> the -w64- within cross-compiler's triplet means that this compiler
> uses mingw-w64 runtime headers and libraries. The architecture part of
> triplet (i686|x86_64) makes the difference, if a cross-compiler
> produces binaries for i686 (means 32-bit), or for x86_64  (means
> 64-bit) windows native.
> Btw the -m32 is superflous for the i686-w64-mingw32 cross-compiler, as
> it just produces 32-bit and has no 64-bit capabilities builtin.
> Could you show please your x.c file, as the message you get is a
> compiler error already. I would assume that you missed to include some
> header, or you were defining something which cause here the harm.

Well, the program compiles just fine with the old gcc-3 -mno-cygwin but
anyway, here's a stripped down version:


#define WINVER 0x0500
#include <windows.h>

int STDCALL WinMain (HINSTANCE hInst, HINSTANCE hPrev, LPSTR lpCmd, int  
nShow) {
    return 0;
}


  orion> i686-w64-mingw32-gcc -mwindows -m32 xx.c
xx.c:4:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before  
'WinMain'
  orion> gcc-3 -mno-cygwin -mwindows -m32 xx.c
  orion>

Thanks,
Michael


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