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Subject: Re: ushort definition
To: cygwin AT cygwin DOT com
References: <9d119899-88ca-c530-c1b4-1a5613dc6daa AT gmail DOT com> <20170109165932 DOT GA26337 AT calimero DOT vinschen DOT de> <0446748b-9e3d-a3bc-1c2f-e5e556f735c2 AT gmail DOT com> <6c9cefe8-b25a-9f63-c3a4-5eaf5ad0ad0f AT t-online DOT de> <20b0921a-0c66-9429-7c88-41d312041feb AT gmail DOT com> <5920d91e-43c4-f57b-3711-e423879c6896 AT t-online DOT de>
From: Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID: <ab3cccde-9008-5176-2ca9-a7ac10e56b9c@gmail.com>
Date: Tue, 10 Jan 2017 00:05:36 +0100
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On 09/01/2017 23:30, Hans-Bernhard Bröker wrote:
> Am 09.01.2017 um 20:46 schrieb Marco Atzeri:
>> On 09/01/2017 19:01, Hans-Bernhard Bröker wrote:
>
>
>> the "#define ushort unsigned short" is in the
>> /usr/include/jasper/jas_config.h
>>
>> It seems jasper configuration had not defined __MISC_VISIBLE,
>> while gdal does.
>
> Neither is supposed to #define __MISC_VISIBLE itself.  cscope finds:
>
> $ cscope -dL1 __MISC_VISIBLE
> /usr/include/sys/features.h __MISC_VISIBLE 276 #define __MISC_VISIBLE 1
> /usr/include/sys/features.h __MISC_VISIBLE 278 #define __MISC_VISIBLE 0
>
> So let's look at a bit of context:
>
> $ sed -n -e '270,280p' /usr/include/sys/features.h
> #define __LARGEFILE_VISIBLE     1
> #else
> #define __LARGEFILE_VISIBLE     0
> #endif
>
> #ifdef _DEFAULT_SOURCE
> #define __MISC_VISIBLE          1
> #else
> #define __MISC_VISIBLE          0
> #endif
>
> I.e. if jasper didn't have __MISC_VISIBLE on, it must have overridden
> the default feature test state of _DEFAULT_SOURCE.

I will bet on a "-std=C99" somewhere

> The lesson to be had from all this: #defining types is just wrong. Don't
> do it.  typedef exists to be used.

Thanks again
Marco





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