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From: Ken Brown <kbrown AT cornell DOT edu>
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Date: Sun, 6 Aug 2017 16:43:38 -0400
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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);
    ^

Ken

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