types.m4

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# AC_TYPE_SIGNAL
# --------------
# Note that identifiers starting with SIG are reserved by ANSI C.
AN_FUNCTION([signal],  [AC_TYPE_SIGNAL])
AC_DEFUN([AC_TYPE_SIGNAL],
[AC_CACHE_CHECK([return type of signal handlers], ac_cv_type_signal,
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <sys/types.h>
#include <signal.h>
],
		 [return *(signal (0, 0)) (0) == 1;])],
		   [ac_cv_type_signal=int],
		   [ac_cv_type_signal=void])])
AC_DEFINE_UNQUOTED(RETSIGTYPE, $ac_cv_type_signal,
		   [Define as the return type of signal handlers
		    (`int' or `void').])
])


## ------------------------ ##
## Checking size of types.  ##
## ------------------------ ##

# ---------------- #
# Generic checks.  #
# ---------------- #


# AC_CHECK_SIZEOF(TYPE, [IGNORED], [INCLUDES = DEFAULT-INCLUDES])
# ---------------------------------------------------------------
AC_DEFUN([AC_CHECK_SIZEOF],
[AS_LITERAL_IF([$1], [],
	       [AC_FATAL([$0: requires literal arguments])])dnl
AC_CHECK_TYPE([$1], [], [], [$3])
AC_CACHE_CHECK([size of $1], AS_TR_SH([ac_cv_sizeof_$1]),
[if test "$AS_TR_SH([ac_cv_type_$1])" = yes; then
  # The cast to long int works around a bug in the HP C Compiler
  # version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
  # declarations like `int a3[[(sizeof (unsigned char)) >= 0]];'.
  # This bug is HP SR number 8606223364.
  _AC_COMPUTE_INT([(long int) (sizeof (ac__type_sizeof_))],
		  [AS_TR_SH([ac_cv_sizeof_$1])],
		  [AC_INCLUDES_DEFAULT([$3])
		   typedef $1 ac__type_sizeof_;],
		  [AC_MSG_FAILURE([cannot compute sizeof ($1)], 77)])
else
  AS_TR_SH([ac_cv_sizeof_$1])=0
fi])dnl
AC_DEFINE_UNQUOTED(AS_TR_CPP(sizeof_$1), $AS_TR_SH([ac_cv_sizeof_$1]),
		   [The size of `$1', as computed by sizeof.])
])# AC_CHECK_SIZEOF


# AC_CHECK_ALIGNOF(TYPE, [INCLUDES = DEFAULT-INCLUDES])
# -----------------------------------------------------
AC_DEFUN([AC_CHECK_ALIGNOF],
[AS_LITERAL_IF([$1], [],
	       [AC_FATAL([$0: requires literal arguments])])dnl
AC_CHECK_TYPE([$1], [], [], [$2])
AC_CACHE_CHECK([alignment of $1], AS_TR_SH([ac_cv_alignof_$1]),
[if test "$AS_TR_SH([ac_cv_type_$1])" = yes; then
  # The cast to long int works around a bug in the HP C Compiler,
  # see AC_CHECK_SIZEOF for more information.
  _AC_COMPUTE_INT([(long int) offsetof (ac__type_alignof_, y)],
		  [AS_TR_SH([ac_cv_alignof_$1])],
		  [AC_INCLUDES_DEFAULT([$2])
#ifndef offsetof
# define offsetof(type, member) ((char *) &((type *) 0)->member - (char *) 0)
#endif
typedef struct { char x; $1 y; } ac__type_alignof_;],
		  [AC_MSG_FAILURE([cannot compute alignment of ($1)], 77)])
else
  AS_TR_SH([ac_cv_alignof_$1])=0
fi])dnl
AC_DEFINE_UNQUOTED(AS_TR_CPP(alignof_$1), $AS_TR_SH([ac_cv_alignof_$1]),
		   [The normal alignment of `$1', in bytes.])
])# AC_CHECK_ALIGNOF


# AU::AC_INT_16_BITS
# ------------------
# What a great name :)
AU_DEFUN([AC_INT_16_BITS],
[AC_CHECK_SIZEOF([int])
test $ac_cv_sizeof_int = 2 &&
  AC_DEFINE(INT_16_BITS, 1,
	    [Define to 1 if `sizeof (int)' = 2.  Obsolete, use `SIZEOF_INT'.])
], [your code should no longer depend upon `INT_16_BITS', but upon
`SIZEOF_INT == 2'.  Remove this warning and the `AC_DEFINE' when you
adjust the code.])


# AU::AC_LONG_64_BITS
# -------------------
AU_DEFUN([AC_LONG_64_BITS],
[AC_CHECK_SIZEOF([long int])
test $ac_cv_sizeof_long_int = 8 &&
  AC_DEFINE(LONG_64_BITS, 1,
	    [Define to 1 if `sizeof (long int)' = 8.  Obsolete, use
	     `SIZEOF_LONG_INT'.])
], [your code should no longer depend upon `LONG_64_BITS', but upon
`SIZEOF_LONG_INT == 8'.  Remove this warning and the `AC_DEFINE' when
you adjust the code.])



## -------------------------- ##
## Generic structure checks.  ##
## -------------------------- ##


# ---------------- #
# Generic checks.  #
# ---------------- #

# AC_CHECK_MEMBER(AGGREGATE.MEMBER,
#		  [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#		  [INCLUDES = DEFAULT-INCLUDES])
# ---------------------------------------------------------
# AGGREGATE.MEMBER is for instance `struct passwd.pw_gecos', shell
# variables are not a valid argument.
AC_DEFUN([AC_CHECK_MEMBER],
[AS_LITERAL_IF([$1], [],
	       [AC_FATAL([$0: requires literal arguments])])dnl
m4_bmatch([$1], [\.], ,
	 [m4_fatal([$0: Did not see any dot in `$1'])])dnl
AS_VAR_PUSHDEF([ac_Member], [ac_cv_member_$1])dnl
dnl Extract the aggregate name, and the member name
AC_CACHE_CHECK([for $1], ac_Member,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT([$4])],
[dnl AGGREGATE ac_aggr;
static m4_bpatsubst([$1], [\..*]) ac_aggr;
dnl ac_aggr.MEMBER;
if (ac_aggr.m4_bpatsubst([$1], [^[^.]*\.]))
return 0;])],
		[AS_VAR_SET(ac_Member, yes)],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT([$4])],
[dnl AGGREGATE ac_aggr;
static m4_bpatsubst([$1], [\..*]) ac_aggr;
dnl sizeof ac_aggr.MEMBER;
if (sizeof ac_aggr.m4_bpatsubst([$1], [^[^.]*\.]))
return 0;])],
		[AS_VAR_SET(ac_Member, yes)],
		[AS_VAR_SET(ac_Member, no)])])])
AS_IF([test AS_VAR_GET(ac_Member) = yes], [$2], [$3])dnl
AS_VAR_POPDEF([ac_Member])dnl
])# AC_CHECK_MEMBER


# AC_CHECK_MEMBERS([AGGREGATE.MEMBER, ...],
#		   [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]
#		   [INCLUDES = DEFAULT-INCLUDES])
# ---------------------------------------------------------
# The first argument is an m4 list.
AC_DEFUN([AC_CHECK_MEMBERS],
[m4_foreach([AC_Member], [$1],
  [AC_CHECK_MEMBER(AC_Member,
	 [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_[]AC_Member), 1,
			    [Define to 1 if `]m4_bpatsubst(AC_Member,
						     [^[^.]*\.])[' is
			     member of `]m4_bpatsubst(AC_Member, [\..*])['.])
$2],
		 [$3],
		 [$4])])])



# ------------------------------------------------------- #
# Members that ought to be tested with AC_CHECK_MEMBERS.  #
# ------------------------------------------------------- #

AN_IDENTIFIER([st_blksize], [AC_CHECK_MEMBERS([struct stat.st_blksize])])
AN_IDENTIFIER([st_rdev],    [AC_CHECK_MEMBERS([struct stat.st_rdev])])


# Alphabetic order, please.

# _AC_STRUCT_DIRENT(MEMBER)
# -------------------------
AC_DEFUN([_AC_STRUCT_DIRENT],
[
  AC_REQUIRE([AC_HEADER_DIRENT])
  AC_CHECK_MEMBERS([struct dirent.$1], [], [],
    [[
#include <sys/types.h>
#ifdef HAVE_DIRENT_H
# include <dirent.h>
#else
# define dirent direct
# ifdef HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
#  include <ndir.h>
# endif
#endif
    ]])
])

# AC_STRUCT_DIRENT_D_INO
# -----------------------------------
AC_DEFUN([AC_STRUCT_DIRENT_D_INO], [_AC_STRUCT_DIRENT([d_ino])])

# AC_STRUCT_DIRENT_D_TYPE
# ------------------------------------
AC_DEFUN([AC_STRUCT_DIRENT_D_TYPE], [_AC_STRUCT_DIRENT([d_type])])


# AC_STRUCT_ST_BLKSIZE
# --------------------
AU_DEFUN([AC_STRUCT_ST_BLKSIZE],
[AC_CHECK_MEMBERS([struct stat.st_blksize],
		 [AC_DEFINE(HAVE_ST_BLKSIZE, 1,
			    [Define to 1 if your `struct stat' has
			     `st_blksize'.  Deprecated, use
			     `HAVE_STRUCT_STAT_ST_BLKSIZE' instead.])])
], [your code should no longer depend upon `HAVE_ST_BLKSIZE', but
`HAVE_STRUCT_STAT_ST_BLKSIZE'.  Remove this warning and
the `AC_DEFINE' when you adjust the code.])# AC_STRUCT_ST_BLKSIZE


# AC_STRUCT_ST_BLOCKS
# -------------------
# If `struct stat' contains an `st_blocks' member, define
# HAVE_STRUCT_STAT_ST_BLOCKS.  Otherwise, add `fileblocks.o' to the
# output variable LIBOBJS.  We still define HAVE_ST_BLOCKS for backward
# compatibility.  In the future, we will activate specializations for
# this macro, so don't obsolete it right now.
#
# AC_OBSOLETE([$0], [; replace it with
#   AC_CHECK_MEMBERS([struct stat.st_blocks],
#		      [AC_LIBOBJ([fileblocks])])
# Please note that it will define `HAVE_STRUCT_STAT_ST_BLOCKS',
# and not `HAVE_ST_BLOCKS'.])dnl
#
AN_IDENTIFIER([st_blocks],  [AC_STRUCT_ST_BLOCKS])
AC_DEFUN([AC_STRUCT_ST_BLOCKS],
[AC_CHECK_MEMBERS([struct stat.st_blocks],
		  [AC_DEFINE(HAVE_ST_BLOCKS, 1,
			     [Define to 1 if your `struct stat' has
			      `st_blocks'.  Deprecated, use
			      `HAVE_STRUCT_STAT_ST_BLOCKS' instead.])],
		  [AC_LIBOBJ([fileblocks])])
])# AC_STRUCT_ST_BLOCKS


# AC_STRUCT_ST_RDEV
# -----------------
AU_DEFUN([AC_STRUCT_ST_RDEV],
[AC_CHECK_MEMBERS([struct stat.st_rdev],
		 [AC_DEFINE(HAVE_ST_RDEV, 1,
			    [Define to 1 if your `struct stat' has `st_rdev'.
			     Deprecated, use `HAVE_STRUCT_STAT_ST_RDEV'
			     instead.])])
], [your code should no longer depend upon `HAVE_ST_RDEV', but
`HAVE_STRUCT_STAT_ST_RDEV'.  Remove this warning and
the `AC_DEFINE' when you adjust the code.])# AC_STRUCT_ST_RDEV


# AC_STRUCT_TM
# ------------
# FIXME: This macro is badly named, it should be AC_CHECK_TYPE_STRUCT_TM.
# Or something else, but what? AC_CHECK_TYPE_STRUCT_TM_IN_SYS_TIME?
AN_IDENTIFIER([tm], [AC_STRUCT_TM])
AC_DEFUN([AC_STRUCT_TM],
[AC_CACHE_CHECK([whether struct tm is in sys/time.h or time.h],
  ac_cv_struct_tm,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
#include <time.h>
],
				    [struct tm *tp; tp->tm_sec;])],
		   [ac_cv_struct_tm=time.h],
		   [ac_cv_struct_tm=sys/time.h])])
if test $ac_cv_struct_tm = sys/time.h; then
  AC_DEFINE(TM_IN_SYS_TIME, 1,
	    [Define to 1 if your <sys/time.h> declares `struct tm'.])
fi
])# AC_STRUCT_TM


# 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'.
AN_IDENTIFIER([tm_zone], [AC_STRUCT_TIMEZONE])
AC_DEFUN([AC_STRUCT_TIMEZONE],
[AC_REQUIRE([AC_STRUCT_TM])dnl
AC_CHECK_MEMBERS([struct tm.tm_zone],,,[#include <sys/types.h>
#include <$ac_cv_struct_tm>
])
if test "$ac_cv_member_struct_tm_tm_zone" = yes; then
  AC_DEFINE(HAVE_TM_ZONE, 1,
	    [Define to 1 if your `struct tm' has `tm_zone'. Deprecated, use
	     `HAVE_STRUCT_TM_TM_ZONE' instead.])
else
  AC_CHECK_DECLS([tzname], , , [#include <time.h>])
  AC_CACHE_CHECK(for tzname, ac_cv_var_tzname,
[AC_LINK_IFELSE([AC_LANG_PROGRAM(
[[#include <time.h>
#if !HAVE_DECL_TZNAME
extern char *tzname[];
#endif
]],
[[return tzname[0][0];]])],
		[ac_cv_var_tzname=yes],
		[ac_cv_var_tzname=no])])
  if test $ac_cv_var_tzname = yes; then
    AC_DEFINE(HAVE_TZNAME, 1,
	      [Define to 1 if you don't have `tm_zone' but do have the external
	       array `tzname'.])
  fi
fi
])# AC_STRUCT_TIMEZONE