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From: Ken Brown <kbrown AT cornell DOT edu>
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Date: Sun, 6 Aug 2017 17:49:18 -0400
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On 8/6/2017 4:43 PM, Ken Brown wrote:
> On 8/6/2017 12:59 PM, Marco Atzeri wrote:
>> hdf5 seems wrong to use sigsetjmp and C99 but Cygwin seems to
>> have a consistency issue.
> 
> I think you're right that Cygwin shouldn't declare or define sigsetjmp 
> under -std=c99.  Here's a simple test:
> 
> $ cat test.c
> #include <setjmp.h>
> 
> int
> main ()
> {
>    sigjmp_buf env;
>    sigsetjmp (env, 0);
> }
> 
> On Cygwin:
> 
> $ gcc -std=c99 test.c
> In file included from /usr/include/setjmp.h:10:0,
>                   from test.c:1:
> test.c: In function ‘main’:
> test.c:7:3: error: ‘SIG_SETMASK’ undeclared (first use in this function)
>     sigsetjmp (env, 0);
>     ^
> 
> On Linux:
> 
> $ gcc -std=c99 test.c
> test.c: In function ‘main’:
> test.c:6:3: error: unknown type name ‘sigjmp_buf’
>     sigjmp_buf env;
>     ^
> test.c:7:3: warning: implicit declaration of function ‘sigsetjmp’ 
> [-Wimplicit-function-declaration]
>     sigsetjmp (env, 0);

I've submitted a patch 
(https://cygwin.com/ml/cygwin-patches/2017-q3/msg00014.html) which makes 
the behavior on Cygwin the same as on Linux.

Ken


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