Error from signal.h when _POSIX_C_SOURCE == 1

Error from signal.h when _POSIX_C_SOURCE == 1

[Christopher Wellons]

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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Re: Error from signal.h when _POSIX_C_SOURCE == 1

[Yaakov Selkowitz]

On 2017-07-11 19:01, Christopher Wellons wrote:

>     /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.

Already fixed in git:

https://sourceware.org/git/?p=newlib-cygwin.git;a=commitdiff;h=8a508f301cb9fb7e11f7cc2e3be7ffd42e64c25f

-- 
Yaakov

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