‘SIG_SETMASK’ and -std=c99

[Achim Gratz]

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

> 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.


Regards,
Achim.
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