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Message-ID: <517803D9.3060504@t-online.de>
Date: Wed, 24 Apr 2013 18:10:01 +0200
From: Christian Franke <Christian DOT Franke AT t-online DOT de>
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To: cygwin AT cygwin DOT com
Subject: Re: Porting to 64 bit Cygwin (was Re: Difference in 32/64-bit curl.)
References: <51766C22 DOT 10702 AT bahnhof DOT se> <51770372 DOT 4070408 AT t-online DOT de> <20130424125930 DOT GQ26397 AT calimero DOT vinschen DOT de> <20130424134749 DOT GR26397 AT calimero DOT vinschen DOT de>
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Corinna Vinschen wrote:
> For clearness I decided to add a quick lecture.  Hope that's ok.

Makes much sense. I would suggest two additions:

> ...
> - DON'T mix up int and long in printf/scanf.  This:
>
>      int i; long l;
>      printf ("%d %ld\n", l, i);
>
>    may not print what you think it should.

- DON'T forget to enable -Wformat gcc warnings, try also -Wformat=2.

(-Wformat is included in -Wall, -Wformat=2 is neither included in -Wall 
nor in -W[extra]).



> ...
> - DON'T use C base types together with Win32 functions.  Keep in mind
>    that DWORD, LONG, ULONG are *not* the same as long and unsigned long.
>    Try to use only Win32 datatypes in conjunction with Win32 API function
>    calls to avoid type problems.

- DON'T forget to add casts if such Win32 API types are used with 
printf(). This:

   printf("Win32 Error=%lu\n", GetLastError());

worked for all i686 and Windows x86_64, but fails now on Cygwin x86_64.


Christian


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