Check types of structures

[Jason Curl]

Hello,

There are the autoconf macros AC_CHECK_TYPE, AC_CHECK_SIZEOF and 
AC_CHECK_MEMBER. I would like to check the size of a member inside a structure. 
Does this already exist in autoconf?

On Interix, the type for "struct timeval.tv_usec" is "long", while on Linux it 
is "suseconds_t". 

I'd rather #define suseconds_t to an equivalent type rather than just assuming 
it is of type long if suseconds_t is not defined. Or am I being too paranoid? I 
just don't see an easy way to do this at the moment. Reading through the 
autoconf sources in /usr/share/autoconf has me mindboggled, I can't figure out 
how it works right now.

Thanks,
Jason.

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