A two-line source file demonstrates this bug:
#define _POSIX_C_SOURCE 1
#include <signal.h>
Then when compiled:
$ gcc -c tmp.c
In file included from /usr/include/sys/signal.h:22:0,
from /usr/include/signal.h:6,
from tmp.c:2:
/usr/include/cygwin/signal.h:328:34: error: unknown type name ‘siginfo_t’
void (*sa_sigaction) ( int, siginfo_t *, void * );
^
Since _POSIX_C_SOURCE < 199309L, siginfo_t isn't defined. However,
cygwin/signal.h erroneously uses this type anyway when defining struct
sigaction. The sa_sigaction field in struct sigaction must also be
guarded by the same feature test macro.
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