acinclude.m4 - third_party/make - Git at Google

 dnl acinclude.m4 -- Extra macros needed for GNU make.
 dnl
 dnl Automake will incorporate this into its generated aclocal.m4.

 dnl ---------------------------------------------------------------------------
 dnl Got this from the lynx 2.8 distribution.
 dnl by T.E.Dickey <dickey@clark.net>
 dnl and Jim Spath <jspath@mail.bcpl.lib.md.us>
 dnl and Philippe De Muyter <phdm@macqel.be>
 dnl
 dnl Created: 1997/1/28
 dnl Updated: 1997/12/23
 dnl ---------------------------------------------------------------------------
 dnl After checking for functions in the default $LIBS, make a further check
 dnl for the functions that are netlib-related (these aren't always in the
 dnl libc, etc., and have to be handled specially because there are conflicting
 dnl and broken implementations.
 dnl Common library requirements (in order):
 dnl	-lresolv -lsocket -lnsl
 dnl	-lnsl -lsocket
 dnl	-lsocket
 dnl	-lbsd
 AC_DEFUN([CF_NETLIBS],[
 cf_test_netlibs=no
 AC_MSG_CHECKING(for network libraries)
 AC_CACHE_VAL(cf_cv_netlibs,[
 AC_MSG_RESULT(working...)
 cf_cv_netlibs=""
 cf_test_netlibs=yes
 AC_CHECK_FUNCS(gethostname,,[
 	CF_RECHECK_FUNC(gethostname,nsl,cf_cv_netlibs,[
 		CF_RECHECK_FUNC(gethostname,socket,cf_cv_netlibs)])])
 #
 # FIXME:  sequent needs this library (i.e., -lsocket -linet -lnsl), but
 # I don't know the entrypoints - 97/7/22 TD
 AC_CHECK_LIB(inet,main,cf_cv_netlibs="-linet $cf_cv_netlibs")
 #
 if test "$ac_cv_func_lsocket" != no ; then
 AC_CHECK_FUNCS(socket,,[
 	CF_RECHECK_FUNC(socket,socket,cf_cv_netlibs,[
 		CF_RECHECK_FUNC(socket,bsd,cf_cv_netlibs)])])
 fi
 #
 AC_CHECK_FUNCS(gethostbyname,,[
 	CF_RECHECK_FUNC(gethostbyname,nsl,cf_cv_netlibs)])
 #
 AC_CHECK_FUNCS(strcasecmp,,[
 	CF_RECHECK_FUNC(strcasecmp,resolv,cf_cv_netlibs)])
 ])
 LIBS="$LIBS $cf_cv_netlibs"
 test $cf_test_netlibs = no && echo "$cf_cv_netlibs" >&AC_FD_MSG
 ])dnl
 dnl ---------------------------------------------------------------------------
 dnl Re-check on a function to see if we can pick it up by adding a library.
 dnl	$1 = function to check
 dnl	$2 = library to check in
 dnl	$3 = environment to update (e.g., $LIBS)
 dnl	$4 = what to do if this fails
 dnl
 dnl This uses 'unset' if the shell happens to support it, but leaves the
 dnl configuration variable set to 'unknown' if not.  This is a little better
 dnl than the normal autoconf test, which gives misleading results if a test
 dnl for the function is made (e.g., with AC_CHECK_FUNC) after this macro is
 dnl used (autoconf does not distinguish between a null token and one that is
 dnl set to 'no').
 AC_DEFUN([CF_RECHECK_FUNC],[
 AC_CHECK_LIB($2,$1,[
 	CF_UPPER(cf_tr_func,$1)
 	AC_DEFINE_UNQUOTED(HAVE_$cf_tr_func,1,[Define if you have function $1])
 	ac_cv_func_$1=yes
 	$3="-l$2 [$]$3"],[
 	ac_cv_func_$1=unknown
 	unset ac_cv_func_$1 2>/dev/null
 	$4],
 	[[$]$3])
 ])dnl
 dnl ---------------------------------------------------------------------------
 dnl Make an uppercase version of a variable
 dnl $1=uppercase($2)
 AC_DEFUN([CF_UPPER],
 [
 changequote(,)dnl
 $1=`echo $2 | tr '[a-z]' '[A-Z]'`
 changequote([,])dnl
 ])dnl


 dnl ---------------------------------------------------------------------------
 dnl From Paul Eggert <eggert@twinsun.com>

 AC_DEFUN(AC_STRUCT_ST_MTIM_NSEC,
  [AC_CACHE_CHECK([for nanoseconds field of struct stat.st_mtim],
    ac_cv_struct_st_mtim_nsec,
    [ac_save_CPPFLAGS="$CPPFLAGS"
     ac_cv_struct_st_mtim_nsec=no
     # tv_nsec -- the usual case
     # _tv_nsec -- Solaris 2.6, if
     #	(defined _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED == 1
     #	 && !defined __EXTENSIONS__)
     # st__tim.tv_nsec -- UnixWare 2.1.2
     for ac_val in tv_nsec _tv_nsec st__tim.tv_nsec; do
       CPPFLAGS="$ac_save_CPPFLAGS -DST_MTIM_NSEC=$ac_val"
       AC_TRY_COMPILE([#include <sys/types.h>
 #include <sys/stat.h>], [struct stat s; s.st_mtim.ST_MTIM_NSEC;],
         [ac_cv_struct_st_mtim_nsec=$ac_val; break])
     done
     CPPFLAGS="$ac_save_CPPFLAGS"])

   if test $ac_cv_struct_st_mtim_nsec != no; then
     AC_DEFINE_UNQUOTED(ST_MTIM_NSEC, $ac_cv_struct_st_mtim_nsec, [Define if 'struct stat' contains a nanoseconds field])
   fi
  ]
 )


 dnl ---------------------------------------------------------------------------
 dnl This will be in the next version of autoconf; take this out then!

 # make_FUNC_SETVBUF_REVERSED
 # ------------------------
 AC_DEFUN([make_FUNC_SETVBUF_REVERSED],
 [AC_REQUIRE([AC_C_PROTOTYPES])dnl
 AC_CACHE_CHECK(whether setvbuf arguments are reversed,
   ac_cv_func_setvbuf_reversed,
   [ac_cv_func_setvbuf_reversed=no
    AC_LINK_IFELSE(
      [AC_LANG_PROGRAM(
 	[[#include <stdio.h>
 #	  if PROTOTYPES
 	   int (setvbuf) (FILE *, int, char *, size_t);
 #	  endif]],
 	[[char buf; return setvbuf (stdout, _IOLBF, &buf, 1);]])],
      [AC_LINK_IFELSE(
 	[AC_LANG_PROGRAM(
 	   [[#include <stdio.h>
 #	     if PROTOTYPES
 	      int (setvbuf) (FILE *, int, char *, size_t);
 #	     endif]],
 	   [[char buf; return setvbuf (stdout, &buf, _IOLBF, 1);]])],
 	[# It compiles and links either way, so it must not be declared
 	 # with a prototype and most likely this is a K&R C compiler.
 	 # Try running it.
 	 AC_RUN_IFELSE(
 	   [AC_LANG_PROGRAM(
 	      [[#include <stdio.h>]],
 	      [[/* This call has the arguments reversed.
 		   A reversed system may check and see that the address of buf
 		   is not _IOLBF, _IONBF, or _IOFBF, and return nonzero.  */
 		char buf;
 		if (setvbuf (stdout, _IOLBF, &buf, 1) != 0)
 		  exit (1);
 		putchar ('\r');
 		exit (0); /* Non-reversed systems SEGV here.  */]])],
 	   ac_cv_func_setvbuf_reversed=yes,
 	   rm -f core core.* *.core,
 	   [[: # Assume setvbuf is not reversed when cross-compiling.]])]
 	ac_cv_func_setvbuf_reversed=yes)])])
 if test $ac_cv_func_setvbuf_reversed = yes; then
   AC_DEFINE(SETVBUF_REVERSED, 1,
             [Define to 1 if the `setvbuf' function takes the buffering type as
              its second argument and the buffer pointer as the third, as on
              System V before release 3.])
 fi
 ])# make_FUNC_SETVBUF_REVERSED
	dnl acinclude.m4 -- Extra macros needed for GNU make.
	dnl
	dnl Automake will incorporate this into its generated aclocal.m4.

	dnl ---------------------------------------------------------------------------
	dnl Got this from the lynx 2.8 distribution.
	dnl by T.E.Dickey <dickey@clark.net>
	dnl and Jim Spath <jspath@mail.bcpl.lib.md.us>
	dnl and Philippe De Muyter <phdm@macqel.be>
	dnl
	dnl Created: 1997/1/28
	dnl Updated: 1997/12/23
	dnl ---------------------------------------------------------------------------
	dnl After checking for functions in the default $LIBS, make a further check
	dnl for the functions that are netlib-related (these aren't always in the
	dnl libc, etc., and have to be handled specially because there are conflicting
	dnl and broken implementations.
	dnl Common library requirements (in order):
	dnl -lresolv -lsocket -lnsl
	dnl -lnsl -lsocket
	dnl -lsocket
	dnl -lbsd
	AC_DEFUN([CF_NETLIBS],[
	cf_test_netlibs=no
	AC_MSG_CHECKING(for network libraries)
	AC_CACHE_VAL(cf_cv_netlibs,[
	AC_MSG_RESULT(working...)
	cf_cv_netlibs=""
	cf_test_netlibs=yes
	AC_CHECK_FUNCS(gethostname,,[
	CF_RECHECK_FUNC(gethostname,nsl,cf_cv_netlibs,[
	CF_RECHECK_FUNC(gethostname,socket,cf_cv_netlibs)])])
	#
	# FIXME: sequent needs this library (i.e., -lsocket -linet -lnsl), but
	# I don't know the entrypoints - 97/7/22 TD
	AC_CHECK_LIB(inet,main,cf_cv_netlibs="-linet $cf_cv_netlibs")
	#
	if test "$ac_cv_func_lsocket" != no ; then
	AC_CHECK_FUNCS(socket,,[
	CF_RECHECK_FUNC(socket,socket,cf_cv_netlibs,[
	CF_RECHECK_FUNC(socket,bsd,cf_cv_netlibs)])])
	fi
	#
	AC_CHECK_FUNCS(gethostbyname,,[
	CF_RECHECK_FUNC(gethostbyname,nsl,cf_cv_netlibs)])
	#
	AC_CHECK_FUNCS(strcasecmp,,[
	CF_RECHECK_FUNC(strcasecmp,resolv,cf_cv_netlibs)])
	])
	LIBS="$LIBS $cf_cv_netlibs"
	test $cf_test_netlibs = no && echo "$cf_cv_netlibs" >&AC_FD_MSG
	])dnl
	dnl ---------------------------------------------------------------------------
	dnl Re-check on a function to see if we can pick it up by adding a library.
	dnl $1 = function to check
	dnl $2 = library to check in
	dnl $3 = environment to update (e.g., $LIBS)
	dnl $4 = what to do if this fails
	dnl
	dnl This uses 'unset' if the shell happens to support it, but leaves the
	dnl configuration variable set to 'unknown' if not. This is a little better
	dnl than the normal autoconf test, which gives misleading results if a test
	dnl for the function is made (e.g., with AC_CHECK_FUNC) after this macro is
	dnl used (autoconf does not distinguish between a null token and one that is
	dnl set to 'no').
	AC_DEFUN([CF_RECHECK_FUNC],[
	AC_CHECK_LIB($2,$1,[
	CF_UPPER(cf_tr_func,$1)
	AC_DEFINE_UNQUOTED(HAVE_$cf_tr_func,1,[Define if you have function $1])
	ac_cv_func_$1=yes
	$3="-l$2 [$]$3"],[
	ac_cv_func_$1=unknown
	unset ac_cv_func_$1 2>/dev/null
	$4],
	[[$]$3])
	])dnl
	dnl ---------------------------------------------------------------------------
	dnl Make an uppercase version of a variable
	dnl $1=uppercase($2)
	AC_DEFUN([CF_UPPER],
	[
	changequote(,)dnl
	$1=`echo $2 \| tr '[a-z]' '[A-Z]'`
	changequote([,])dnl
	])dnl


	dnl ---------------------------------------------------------------------------
	dnl From Paul Eggert <eggert@twinsun.com>

	AC_DEFUN(AC_STRUCT_ST_MTIM_NSEC,
	[AC_CACHE_CHECK([for nanoseconds field of struct stat.st_mtim],
	ac_cv_struct_st_mtim_nsec,
	[ac_save_CPPFLAGS="$CPPFLAGS"
	ac_cv_struct_st_mtim_nsec=no
	# tv_nsec -- the usual case
	# _tv_nsec -- Solaris 2.6, if
	# (defined _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED == 1
	# && !defined __EXTENSIONS__)
	# st__tim.tv_nsec -- UnixWare 2.1.2
	for ac_val in tv_nsec _tv_nsec st__tim.tv_nsec; do
	CPPFLAGS="$ac_save_CPPFLAGS -DST_MTIM_NSEC=$ac_val"
	AC_TRY_COMPILE([#include <sys/types.h>
	#include <sys/stat.h>], [struct stat s; s.st_mtim.ST_MTIM_NSEC;],
	[ac_cv_struct_st_mtim_nsec=$ac_val; break])
	done
	CPPFLAGS="$ac_save_CPPFLAGS"])

	if test $ac_cv_struct_st_mtim_nsec != no; then
	AC_DEFINE_UNQUOTED(ST_MTIM_NSEC, $ac_cv_struct_st_mtim_nsec, [Define if 'struct stat' contains a nanoseconds field])
	fi
	]
	)


	dnl ---------------------------------------------------------------------------
	dnl This will be in the next version of autoconf; take this out then!

	# make_FUNC_SETVBUF_REVERSED
	# ------------------------
	AC_DEFUN([make_FUNC_SETVBUF_REVERSED],
	[AC_REQUIRE([AC_C_PROTOTYPES])dnl
	AC_CACHE_CHECK(whether setvbuf arguments are reversed,
	ac_cv_func_setvbuf_reversed,
	[ac_cv_func_setvbuf_reversed=no
	AC_LINK_IFELSE(
	[AC_LANG_PROGRAM(
	[[#include <stdio.h>
	# if PROTOTYPES
	int (setvbuf) (FILE , int, char , size_t);
	# endif]],
	[[char buf; return setvbuf (stdout, _IOLBF, &buf, 1);]])],
	[AC_LINK_IFELSE(
	[AC_LANG_PROGRAM(
	[[#include <stdio.h>
	# if PROTOTYPES
	int (setvbuf) (FILE , int, char , size_t);
	# endif]],
	[[char buf; return setvbuf (stdout, &buf, _IOLBF, 1);]])],
	[# It compiles and links either way, so it must not be declared
	# with a prototype and most likely this is a K&R C compiler.
	# Try running it.
	AC_RUN_IFELSE(
	[AC_LANG_PROGRAM(
	[[#include <stdio.h>]],
	[[/* This call has the arguments reversed.
	A reversed system may check and see that the address of buf
	is not _IOLBF, _IONBF, or _IOFBF, and return nonzero. */
	char buf;
	if (setvbuf (stdout, _IOLBF, &buf, 1) != 0)
	exit (1);
	putchar ('\r');
	exit (0); /* Non-reversed systems SEGV here. */]])],
	ac_cv_func_setvbuf_reversed=yes,
	rm -f core core.* *.core,
	[[: # Assume setvbuf is not reversed when cross-compiling.]])]
	ac_cv_func_setvbuf_reversed=yes)])])
	if test $ac_cv_func_setvbuf_reversed = yes; then
	AC_DEFINE(SETVBUF_REVERSED, 1,
	[Define to 1 if the `setvbuf' function takes the buffering type as
	its second argument and the buffer pointer as the third, as on
	System V before release 3.])
	fi
	])# make_FUNC_SETVBUF_REVERSED