Re: configure can not determin 'HAVE_LIMITS'

[Steven Woody]

Ralf Corsepius <address@hidden> writes:

> On Wed, 2005-10-26 at 21:52 +0800, Steven Woody wrote:
>> Stepan Kasal <address@hidden> writes:
>> 
>> > Hello,
>> >
>> > On Tue, Oct 25, 2005 at 10:23:55PM +0800, Steven Woody wrote:
>> >> #ifdef HAVE_LIMITS
>> >
>> > add line
>> >
>> > AC_CHECK_HEADERS([limits])
>> >
>> > to configure.ac (or configure.in).
>> >
>> > HTH,
>> >    Stepan Kasal
>> 
>> thanks. but still got problem.  if i say, AC_CHECK_HEADERS([limits]) as you
>> pointed, the the configure script will complain and the HAVE_LIMITS veriable
>> would't be set because my system (Linux) only get limits.h instead of 
>> 'limits'.
>> 
>> so to make 'configure' happy, i changed to AC_CHECK_HEADERS([limits.h]), this
>> time, 'configure' feels happy and HAVE_LIMITS_H is set properly. but the
>> third-party headers used in my project requires a HAVE_LIMITS that is still 
>> not
>> set.
>> 
>> my current solution is add the below line into 'config.h.in':
>> 
>> #define HAVE_LIMITS 1
>> 
>> but i think this is not a decent way. any thinking?
>
> You seem to be confused and are outsmarting yourself ;)
>
> limits.h is a POSIX header. On linux it is supplied by GCC.
>
> So if you want to check for "limits", you should use
> AC_CHECK_HEADERS([limits])
>

but could you explain why AC_CHECK_HEADERS([limits]) failed but
AC_CHECK_HEADERS([limits.h]) success?

> If this fails, something else is broken and you will have to
> investigate. It could be a bug inside of "limits", it could be problem
> elsewhere inside of your configure script, or could be a problem with
> your include paths.
>