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Date: Thu, 26 Mar 2009 04:44:36 +0000
From: Dave Korn <dave DOT korn DOT cygwin AT googlemail DOT com>
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Subject: Re: [1.7] <signal.h> does not compile with -ansi
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Yaakov (Cygwin/X) wrote:

> <sys/signal.h> #includes <sys/types.h> only #ifdef _POSIX_THREADS, which
> is not defined if the -ansi compiler flag is passed.  STC:
> 
> $ echo '#include <signal.h>' > test-signal.c
> 
> $ gcc-4 -ansi -c test-signal.c
> In file included from /usr/include/sys/signal.h:107,
>                  from /usr/include/signal.h:5,
>                  from test.c:1:
> /usr/include/cygwin/signal.h:74: error: expected
> specifier-qualifier-list before 'pthread_attr_t'
> /usr/include/cygwin/signal.h:80: error: expected
> specifier-qualifier-list before '__uint32_t'
> /usr/include/cygwin/signal.h:96: error: expected
> specifier-qualifier-list before 'pid_t'
> /usr/include/cygwin/signal.h:270: error: expected ')' before 'int'
> In file included from /usr/include/signal.h:5,
>                  from test.c:1:
> /usr/include/sys/signal.h:152: error: expected ')' before 'int'

  Posix realtime signals are an extension to the standard C90 spec.  The
"-ansi" documentation mentions this:

     The macro `__STRICT_ANSI__' is predefined when the `-ansi' option
     is used.  Some header files may notice this macro and refrain from
     declaring certain functions or defining certain macros that the
     ISO standard doesn't call for; this is to avoid interfering with
     any programs that might use these names for other things.

  Should signal.h perhaps wrap the stuff tagged 'CX' and 'RTS' at
http://www.opengroup.org/onlinepubs/009695399/basedefs/signal.h.html
in #ifndef __STICT_ANSI__ ?

    cheers,
      DaveK

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