Structures

The following macros check for certain structures or structure members. To check structures not listed here, use AC_EGREP_CPP (see section Examining Declarations) or AC_TRY_COMPILE (see section 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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