AC_CHECK_SIZEOF for members

[Sam Steingold]

How do I check for sizeof of struct members?

E.g., <utmpx.h> declares struct utmpx which has a member ut_tv which is
supposed to be just like struct timeval except that GLIBC 2.3.2 uses
32-bit slots for the utmpx->ut_tv even on 64-bit platforms, so
SIZEOF_STRUCT_TIMEVAL is useless here.

So, how do I find out

    struct utmpx u;
    sizeof(u.ut_tv.tv_sec);

it appears that AC_CHECK_SIZEOF works only with types, not members.

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Sam Steingold (http://www.podval.org/~sds) running w2k
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