(autocf21.info.gz) Structures

 
 4.5 Structures
 ==============
 
 The following macros check for certain structures or structure members.
 Examining Declarations::) or `AC_TRY_COMPILE' ( Examining
 Syntax).
 
  -- Macro: AC_HEADER_STAT
      If the macros `S_ISDIR', `S_ISREG' et al. defined in `sys/stat.h'
      do not work properly (returning false positives), define
      `STAT_MACROS_BROKEN'.  This is the case on Tektronix UTekV, Amdahl
      UTS and Motorola System V/88.
 
  -- Macro: AC_HEADER_TIME
      If a program may include both `time.h' and `sys/time.h', define
      `TIME_WITH_SYS_TIME'.  On some older systems, `sys/time.h'
      includes `time.h', but `time.h' is not protected against multiple
      inclusion, so programs should not explicitly include both files.
      This macro is useful in programs that use, for example, `struct
      timeval' or `struct timezone' as well as `struct tm'.  It is best
      used in conjunction with `HAVE_SYS_TIME_H', which can be checked
      for using `AC_CHECK_HEADERS(sys/time.h)'.
 
           #if TIME_WITH_SYS_TIME
           # include <sys/time.h>
           # include <time.h>
           #else
           # if HAVE_SYS_TIME_H
           #  include <sys/time.h>
           # else
           #  include <time.h>
           # endif
           #endif
 
  -- Macro: AC_STRUCT_ST_BLKSIZE
      If `struct stat' contains an `st_blksize' member, define
      `HAVE_ST_BLKSIZE'.
 
  -- Macro: AC_STRUCT_ST_BLOCKS
      If `struct stat' contains an `st_blocks' member, define
      `HAVE_ST_BLOCKS'.  Otherwise, add `fileblocks.o' to the output
      variable `LIBOBJS'.
 
  -- Macro: AC_STRUCT_ST_RDEV
      If `struct stat' contains an `st_rdev' member, define
      `HAVE_ST_RDEV'.
 
  -- Macro: AC_STRUCT_TM
      If `time.h' does not define `struct tm', define `TM_IN_SYS_TIME',
      which means that including `sys/time.h' had better define `struct
      tm'.
 
  -- Macro: AC_STRUCT_TIMEZONE
      Figure out how to get the current timezone.  If `struct tm' has a
      `tm_zone' member, define `HAVE_TM_ZONE'.  Otherwise, if the
      external array `tzname' is found, define `HAVE_TZNAME'.
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