OpenLDAP Faq-O-Matic: Why can 'configure' fail to work out sizeof 'short', 'int' and 'long'?

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Why can 'configure' fail to work out sizeof 'short', 'int' and 'long'?

On Sol 7, configure was trying to work out the byte-sizes of the above std. types, but kept failing. On checking the config.log, it was failing because certain settings in configure's 'config.h' (which it uses to #include into it's test-code) were conflicting with settings in <sys/types.h>.
It looked like configure was failing to accurately work out some standard system types from sys/types.h: mode_t off_t pid_t size_t ssize_t caddr_t
Adding the following fixed it:

env ac_cv_type_mode_t=yes \

    ac_cv_type_off_t=yes \
    ac_cv_type_pid_t=yes \
    ac_cv_type_size_t=yes \
    ac_cv_type_ssize_t=yes \
    ac_cv_type_caddr_t=yes \
      ./configure ...

wildjim@pobox.com

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