Re: ‘SIG_SETMASK’ and -std=c99
- Date: Sun, 6 Aug 2017 16:51:56 +0200
- From: Marco Atzeri <marco.atzeri@xxxxxxxxx>
- Subject: Re: ‘SIG_SETMASK’ and -std=c99
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.
That is not very informative as signal.h is in C99.
however SIG_SETMASK is not
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.
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