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To:	cygwin AT cygwin DOT com
References:	<2adce715-b45b-ed1c-567e-68bc826710ec AT gmail DOT com> <87vam16nez DOT fsf AT Rainer DOT invalid>
From:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID:	<77932431-b0cc-0e23-3cb8-0659a5c3307a@gmail.com>
Date:	Sun, 6 Aug 2017 16:51:56 +0200
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On 06/08/2017 11:44, Achim Gratz wrote:
> Marco Atzeri writes:
>> building again hdf5-1.8.18 on latest cygwin I hit
>>
>> error: ‘SIG_SETMASK’ undeclared
>>
>> removing  "-std=c99" from CFLAGS solves the issue.
>
> https://stackoverflow.com/questions/20849917/invalid-signal-processing-library-in-linux

That is not very informative as signal.h is in C99.
http://www.open-std.org/jtc1/sc22/WG14/www/docs/n1256.pdf

however SIG_SETMASK is not
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/signal.h.html

>
>> As before the "-std=c99" was not causing any problem , it is not clear
>> to me if the current behavior is correct or a side effect of latest
>> cygwin header reshuffle.
>
> The "-std=c*" options are not meant to expose any symbols that are not
> defined in the respective C standard.  You almost always want to use
> "-std=gnu*" instead if you target POSIX-y systems.

formally you are right. However it seems that Cygwin is now
more stringent than Linux where this problem does not arise.


> Regards,
> Achim.

Regards
Marco


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