Re: [MinGW-dvlpr] MinGW runtime: main() / WinMain()

[Earnie B. <ea...@us...>]

BTW, Dimitri, I've updated the CVS version to 4.0, you may begin with 
your changes.

Earnie.

Danny Smith wrote:
> From: "Dimitri Papadopoulos-Orfanos"
> 
> 
>>Hi,
>>
>>The MinGW runtime provides 2 different entry points:
>>* mainCRTStartup() for console programs (-subsystem,console)
>>* WinMainCRTStartup() for GUI programs (-subsystem,windows)
>>
>>Currently both call __mingw_CRTStartup() so the behavior is the same
> 
> for
> 
>>console and GUI programs. From crt1.c:
>>   /*
>>    * Call the main function. If the user does not supply one
>>    * the one in the 'libmingw32.a' library will be linked in, and
>>    * that one calls WinMain. See main.c in the 'lib' dir
>>    * for more details.
>>    */
>>   nRet = main (_argc, _argv, environ);
>>
>>This is different from the behavior of Borland and Microsoft
> 
> compilers.
> 
>>
>>I think the MinGW runtime should be modified:
>>* In the GUI case, WinMain() should have precedence over main():
>>   1) Call WinMain().
>>   2) If the user doesn't supply WinMain(), a default WinMain() is
>>linked in.
>>   3) The default WinMain() calls main().
>>* In the console case, WinMain() should probably not be called at all:
>>   1) Just call main().
>>
> 
> 
> GCC treats symbol "main" specially, inserting code for aligning stack,
> calling global ctors and registering global dtors.  What happens if
> user-supplied WinMain _doesn't_
> call main()?  Maybe a pre-emptive call to __main in WinMainCRTStartup
> (see DllMainCRTStartup in dllcrt1.c)  or elsewhere would be sufficient??
> 
> Danny
> 
> <snip>
> 
>>--
>>Dimitri
>>
>>
>>
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