functions.m4

autoconf是一个产生可以自动配置源代码包

# AC_FUNC_CHOWN
# -------------
# Determine whether chown accepts arguments of -1 for uid and gid.
AN_FUNCTION([chown], [AC_FUNC_CHOWN])
AC_DEFUN([AC_FUNC_CHOWN],
[AC_REQUIRE([AC_TYPE_UID_T])dnl
AC_CHECK_HEADERS(unistd.h)
AC_CACHE_CHECK([for working chown], ac_cv_func_chown_works,
[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
#include <fcntl.h>
],
[[  char *f = "conftest.chown";
  struct stat before, after;

  if (creat (f, 0600) < 0)
    return 1;
  if (stat (f, &before) < 0)
    return 1;
  if (chown (f, (uid_t) -1, (gid_t) -1) == -1)
    return 1;
  if (stat (f, &after) < 0)
    return 1;
  return ! (before.st_uid == after.st_uid && before.st_gid == after.st_gid);
]])],
	       [ac_cv_func_chown_works=yes],
	       [ac_cv_func_chown_works=no],
	       [ac_cv_func_chown_works=no])
rm -f conftest.chown
])
if test $ac_cv_func_chown_works = yes; then
  AC_DEFINE(HAVE_CHOWN, 1,
	    [Define to 1 if your system has a working `chown' function.])
fi
])# AC_FUNC_CHOWN


# AC_FUNC_CLOSEDIR_VOID
# ---------------------
# Check whether closedir returns void, and #define CLOSEDIR_VOID in
# that case.
AN_FUNCTION([closedir], [AC_FUNC_CLOSEDIR_VOID])
AC_DEFUN([AC_FUNC_CLOSEDIR_VOID],
[AC_REQUIRE([AC_HEADER_DIRENT])dnl
AC_CACHE_CHECK([whether closedir returns void],
	       [ac_cv_func_closedir_void],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT
#include <$ac_header_dirent>
#ifndef __cplusplus
int closedir ();
#endif
],
				[[return closedir (opendir (".")) != 0;]])],
	       [ac_cv_func_closedir_void=no],
	       [ac_cv_func_closedir_void=yes],
	       [ac_cv_func_closedir_void=yes])])
if test $ac_cv_func_closedir_void = yes; then
  AC_DEFINE(CLOSEDIR_VOID, 1,
	    [Define to 1 if the `closedir' function returns void instead
	     of `int'.])
fi
])


# AC_FUNC_ERROR_AT_LINE
# ---------------------
AN_FUNCTION([error],         [AC_FUNC_ERROR_AT_LINE])
AN_FUNCTION([error_at_line], [AC_FUNC_ERROR_AT_LINE])
AC_DEFUN([AC_FUNC_ERROR_AT_LINE],
[AC_LIBSOURCES([error.h, error.c])dnl
AC_CACHE_CHECK([for error_at_line], ac_cv_lib_error_at_line,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
				 [error_at_line (0, 0, "", 0, "");])],
		[ac_cv_lib_error_at_line=yes],
		[ac_cv_lib_error_at_line=no])])
if test $ac_cv_lib_error_at_line = no; then
  AC_LIBOBJ(error)
fi
])


# AU::AM_FUNC_ERROR_AT_LINE
# -------------------------
AU_ALIAS([AM_FUNC_ERROR_AT_LINE], [AC_FUNC_ERROR_AT_LINE])


# _AC_FUNC_FNMATCH_IF(STANDARD = GNU | POSIX, CACHE_VAR, IF-TRUE, IF-FALSE)
# -------------------------------------------------------------------------
# If a STANDARD compliant fnmatch is found, run IF-TRUE, otherwise
# IF-FALSE.  Use CACHE_VAR.
AC_DEFUN([_AC_FUNC_FNMATCH_IF],
[AC_CACHE_CHECK(
   [for working $1 fnmatch],
   [$2],
  [# Some versions of Solaris, SCO, and the GNU C Library
   # have a broken or incompatible fnmatch.
   # So we run a test program.  If we are cross-compiling, take no chance.
   # Thanks to John Oleynick, Franc,ois Pinard, and Paul Eggert for this test.
   AC_RUN_IFELSE(
      [AC_LANG_PROGRAM(
	 [#include <fnmatch.h>
#	   define y(a, b, c) (fnmatch (a, b, c) == 0)
#	   define n(a, b, c) (fnmatch (a, b, c) == FNM_NOMATCH)
	 ],
	 [return
	   (!(y ("a*", "abc", 0)
	      && n ("d*/*1", "d/s/1", FNM_PATHNAME)
	      && y ("a\\\\bc", "abc", 0)
	      && n ("a\\\\bc", "abc", FNM_NOESCAPE)
	      && y ("*x", ".x", 0)
	      && n ("*x", ".x", FNM_PERIOD)
	      && m4_if([$1], [GNU],
		   [y ("xxXX", "xXxX", FNM_CASEFOLD)
		    && y ("a++(x|yy)b", "a+xyyyyxb", FNM_EXTMATCH)
		    && n ("d*/*1", "d/s/1", FNM_FILE_NAME)
		    && y ("*", "x", FNM_FILE_NAME | FNM_LEADING_DIR)
		    && y ("x*", "x/y/z", FNM_FILE_NAME | FNM_LEADING_DIR)
		    && y ("*c*", "c/x", FNM_FILE_NAME | FNM_LEADING_DIR)],
		   1)));])],
      [$2=yes],
      [$2=no],
      [$2=cross])])
AS_IF([test $$2 = yes], [$3], [$4])
])# _AC_FUNC_FNMATCH_IF


# AC_FUNC_FNMATCH
# ---------------
AC_DEFUN([AC_FUNC_FNMATCH],
[_AC_FUNC_FNMATCH_IF([POSIX], [ac_cv_func_fnmatch_works],
		     [AC_DEFINE([HAVE_FNMATCH], 1,
		     [Define to 1 if your system has a working POSIX `fnmatch'
		      function.])])
])# AC_FUNC_FNMATCH


# _AC_LIBOBJ_FNMATCH
# ------------------
# Prepare the replacement of fnmatch.
AC_DEFUN([_AC_LIBOBJ_FNMATCH],
[AC_REQUIRE([AC_C_CONST])dnl
AC_REQUIRE([AC_FUNC_ALLOCA])dnl
AC_REQUIRE([AC_TYPE_MBSTATE_T])dnl
AC_CHECK_DECLS([getenv])
AC_CHECK_FUNCS([btowc mbsrtowcs mempcpy wmempcpy])
AC_CHECK_HEADERS([wchar.h wctype.h])
AC_LIBOBJ([fnmatch])
AC_CONFIG_LINKS([$ac_config_libobj_dir/fnmatch.h:$ac_config_libobj_dir/fnmatch_.h])
AC_DEFINE(fnmatch, rpl_fnmatch,
	  [Define to rpl_fnmatch if the replacement function should be used.])
])# _AC_LIBOBJ_FNMATCH


# AC_REPLACE_FNMATCH
# ------------------
AN_FUNCTION([fnmatch], [AC_REPLACE_FNMATCH])
AC_DEFUN([AC_REPLACE_FNMATCH],
[_AC_FUNC_FNMATCH_IF([POSIX], [ac_cv_func_fnmatch_works],
		     [rm -f "$ac_config_libobj_dir/fnmatch.h"],
		     [_AC_LIBOBJ_FNMATCH])
])# AC_REPLACE_FNMATCH


# AC_FUNC_FNMATCH_GNU
# -------------------
AC_DEFUN([AC_FUNC_FNMATCH_GNU],
[AC_REQUIRE([AC_GNU_SOURCE])
_AC_FUNC_FNMATCH_IF([GNU], [ac_cv_func_fnmatch_gnu],
		    [rm -f "$ac_config_libobj_dir/fnmatch.h"],
		    [_AC_LIBOBJ_FNMATCH])
])# AC_FUNC_FNMATCH_GNU


# AU::AM_FUNC_FNMATCH
# AU::fp_FUNC_FNMATCH
# -------------------
AU_ALIAS([AM_FUNC_FNMATCH], [AC_FUNC_FNMATCH])
AU_ALIAS([fp_FUNC_FNMATCH], [AC_FUNC_FNMATCH])


# AC_FUNC_FSEEKO
# --------------
AN_FUNCTION([ftello], [AC_FUNC_FSEEKO])
AN_FUNCTION([fseeko], [AC_FUNC_FSEEKO])
AC_DEFUN([AC_FUNC_FSEEKO],
[_AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,
   [ac_cv_sys_largefile_source],
   [Define to 1 to make fseeko visible on some hosts (e.g. glibc 2.2).],
   [@%:@include <stdio.h>], [return !fseeko;])

# We used to try defining _XOPEN_SOURCE=500 too, to work around a bug
# in glibc 2.1.3, but that breaks too many other things.
# If you want fseeko and ftello with glibc, upgrade to a fixed glibc.
AC_CACHE_CHECK([for fseeko], [ac_cv_func_fseeko],
[AC_LINK_IFELSE([AC_LANG_PROGRAM([@%:@include <stdio.h>],
				 [[return fseeko && fseeko (stdin, 0, 0);]])],
		[ac_cv_func_fseeko=yes],
		[ac_cv_func_fseeko=no])])
if test $ac_cv_func_fseeko = yes; then
  AC_DEFINE(HAVE_FSEEKO, 1,
    [Define to 1 if fseeko (and presumably ftello) exists and is declared.])
fi
])# AC_FUNC_FSEEKO


# AC_FUNC_GETGROUPS
# -----------------
# Try to find `getgroups', and check that it works.
# When cross-compiling, assume getgroups is broken.
AN_FUNCTION([getgroups], [AC_FUNC_GETGROUPS])
AC_DEFUN([AC_FUNC_GETGROUPS],
[AC_REQUIRE([AC_TYPE_GETGROUPS])dnl
AC_REQUIRE([AC_TYPE_SIZE_T])dnl
AC_CHECK_FUNC(getgroups)

# If we don't yet have getgroups, see if it's in -lbsd.
# This is reported to be necessary on an ITOS 3000WS running SEIUX 3.1.
ac_save_LIBS=$LIBS
if test $ac_cv_func_getgroups = no; then
  AC_CHECK_LIB(bsd, getgroups, [GETGROUPS_LIB=-lbsd])
fi

# Run the program to test the functionality of the system-supplied
# getgroups function only if there is such a function.
if test $ac_cv_func_getgroups = yes; then
  AC_CACHE_CHECK([for working getgroups], ac_cv_func_getgroups_works,
   [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
      [[/* On Ultrix 4.3, getgroups (0, 0) always fails.  */
       return getgroups (0, 0) == -1;]])],
		  [ac_cv_func_getgroups_works=yes],
		  [ac_cv_func_getgroups_works=no],
		  [ac_cv_func_getgroups_works=no])
   ])
  if test $ac_cv_func_getgroups_works = yes; then
    AC_DEFINE(HAVE_GETGROUPS, 1,
	      [Define to 1 if your system has a working `getgroups' function.])
  fi
fi
LIBS=$ac_save_LIBS
])# AC_FUNC_GETGROUPS


# _AC_LIBOBJ_GETLOADAVG
# ---------------------
# Set up the AC_LIBOBJ replacement of `getloadavg'.
m4_define([_AC_LIBOBJ_GETLOADAVG],
[AC_LIBOBJ(getloadavg)
AC_DEFINE(C_GETLOADAVG, 1, [Define to 1 if using `getloadavg.c'.])
# Figure out what our getloadavg.c needs.
ac_have_func=no
AC_CHECK_HEADER(sys/dg_sys_info.h,
[ac_have_func=yes
 AC_DEFINE(DGUX, 1, [Define to 1 for DGUX with <sys/dg_sys_info.h>.])
 AC_CHECK_LIB(dgc, dg_sys_info)])

AC_CHECK_HEADER(locale.h)
AC_CHECK_FUNCS(setlocale)

# We cannot check for <dwarf.h>, because Solaris 2 does not use dwarf (it
# uses stabs), but it is still SVR4.  We cannot check for <elf.h> because
# Irix 4.0.5F has the header but not the library.
if test $ac_have_func = no && test "$ac_cv_lib_elf_elf_begin" = yes; then
  ac_have_func=yes
  AC_DEFINE(SVR4, 1, [Define to 1 on System V Release 4.])
fi

if test $ac_have_func = no; then
  AC_CHECK_HEADER(inq_stats/cpustats.h,
  [ac_have_func=yes
   AC_DEFINE(UMAX, 1, [Define to 1 for Encore UMAX.])
   AC_DEFINE(UMAX4_3, 1,
	     [Define to 1 for Encore UMAX 4.3 that has <inq_status/cpustats.h>
	      instead of <sys/cpustats.h>.])])
fi

if test $ac_have_func = no; then
  AC_CHECK_HEADER(sys/cpustats.h,
  [ac_have_func=yes; AC_DEFINE(UMAX)])
fi

if test $ac_have_func = no; then
  AC_CHECK_HEADERS(mach/mach.h)
fi

AC_CHECK_HEADERS(nlist.h,
[AC_CHECK_MEMBERS([struct nlist.n_un.n_name],
		  [AC_DEFINE(NLIST_NAME_UNION, 1,
			     [Define to 1 if your `struct nlist' has an
			      `n_un' member.  Obsolete, depend on
			      `HAVE_STRUCT_NLIST_N_UN_N_NAME])], [],
		  [@%:@include <nlist.h>])
])dnl
])# _AC_LIBOBJ_GETLOADAVG


# AC_FUNC_GETLOADAVG
# ------------------
AN_FUNCTION([getloadavg], [AC_FUNC_GETLOADAVG])
AC_DEFUN([AC_FUNC_GETLOADAVG],
[ac_have_func=no # yes means we've found a way to get the load average.

# Make sure getloadavg.c is where it belongs, at configure-time.
test -f "$srcdir/$ac_config_libobj_dir/getloadavg.c" ||
  AC_MSG_ERROR([$srcdir/$ac_config_libobj_dir/getloadavg.c is missing])

ac_save_LIBS=$LIBS

# Check for getloadavg, but be sure not to touch the cache variable.
(AC_CHECK_FUNC(getloadavg, exit 0, exit 1)) && ac_have_func=yes

# On HPUX9, an unprivileged user can get load averages through this function.
AC_CHECK_FUNCS(pstat_getdynamic)

# Solaris has libkstat which does not require root.
AC_CHECK_LIB(kstat, kstat_open)
test $ac_cv_lib_kstat_kstat_open = yes && ac_have_func=yes

# Some systems with -lutil have (and need) -lkvm as well, some do not.
# On Solaris, -lkvm requires nlist from -lelf, so check that first
# to get the right answer into the cache.
# For kstat on solaris, we need libelf to force the definition of SVR4 below.
if test $ac_have_func = no; then
  AC_CHECK_LIB(elf, elf_begin, LIBS="-lelf $LIBS")
fi
if test $ac_have_func = no; then
  AC_CHECK_LIB(kvm, kvm_open, LIBS="-lkvm $LIBS")
  # Check for the 4.4BSD definition of getloadavg.
  AC_CHECK_LIB(util, getloadavg,
    [LIBS="-lutil $LIBS" ac_have_func=yes ac_cv_func_getloadavg_setgid=yes])
fi

if test $ac_have_func = no; then
  # There is a commonly available library for RS/6000 AIX.
  # Since it is not a standard part of AIX, it might be installed locally.
  ac_getloadavg_LIBS=$LIBS
  LIBS="-L/usr/local/lib $LIBS"
  AC_CHECK_LIB(getloadavg, getloadavg,
	       [LIBS="-lgetloadavg $LIBS"], [LIBS=$ac_getloadavg_LIBS])
fi

# Make sure it is really in the library, if we think we found it,
# otherwise set up the replacement function.
AC_CHECK_FUNCS(getloadavg, [],
	       [_AC_LIBOBJ_GETLOADAVG])

# Some definitions of getloadavg require that the program be installed setgid.
AC_CACHE_CHECK(whether getloadavg requires setgid,
	       ac_cv_func_getloadavg_setgid,
[AC_EGREP_CPP([Yowza Am I SETGID yet],
[#include "$srcdir/$ac_config_libobj_dir/getloadavg.c"
#ifdef LDAV_PRIVILEGED
Yowza Am I SETGID yet
@%:@endif],
	      ac_cv_func_getloadavg_setgid=yes,
	      ac_cv_func_getloadavg_setgid=no)])
if test $ac_cv_func_getloadavg_setgid = yes; then
  NEED_SETGID=true
  AC_DEFINE(GETLOADAVG_PRIVILEGED, 1,
	    [Define to 1 if the `getloadavg' function needs to be run setuid
	     or setgid.])
else
  NEED_SETGID=false
fi
AC_SUBST(NEED_SETGID)dnl

if test $ac_cv_func_getloadavg_setgid = yes; then
  AC_CACHE_CHECK(group of /dev/kmem, ac_cv_group_kmem,
[ # On Solaris, /dev/kmem is a symlink.  Get info on the real file.
  ac_ls_output=`ls -lgL /dev/kmem 2>/dev/null`
  # If we got an error (system does not support symlinks), try without -L.
  test -z "$ac_ls_output" && ac_ls_output=`ls -lg /dev/kmem`
  ac_cv_group_kmem=`echo $ac_ls_output \
    | sed -ne ['s/[	 ][	 ]*/ /g;
	       s/^.[sSrwx-]* *[0-9]* *\([^0-9]*\)  *.*/\1/;
	       / /s/.* //;p;']`
])
  AC_SUBST(KMEM_GROUP, $ac_cv_group_kmem)dnl
fi
if test "x$ac_save_LIBS" = x; then
  GETLOADAVG_LIBS=$LIBS
else
  GETLOADAVG_LIBS=`echo "$LIBS" | sed "s!$ac_save_LIBS!!"`
fi
LIBS=$ac_save_LIBS

AC_SUBST(GETLOADAVG_LIBS)dnl
])# AC_FUNC_GETLOADAVG


# AU::AC_GETLOADAVG
# -----------------
AU_ALIAS([AC_GETLOADAVG], [AC_FUNC_GETLOADAVG])


# AC_FUNC_GETMNTENT
# -----------------
AN_FUNCTION([getmntent], [AC_FUNC_GETMNTENT])
AC_DEFUN([AC_FUNC_GETMNTENT],
[# getmntent is in the standard C library on UNICOS, in -lsun on Irix 4,
# -lseq on Dynix/PTX, -lgen on Unixware.
AC_SEARCH_LIBS(getmntent, [sun seq gen])