dnl Process this file with `autoconf' to create `configure'.
dnl
dnl Copyright (c) 1992, 1995, 1996 Xerox Corporation.  All rights reserved.
dnl Portions of this code were written by Stephen White, aka ghond.
dnl Use and copying of this software and preparation of derivative works based
dnl upon this software are permitted.  Any distribution of this software or
dnl derivative works must comply with all applicable United States export
dnl control laws.  This software is made available AS IS, and Xerox Corporation
dnl makes no warranty about the software, its performance or its conformity to
dnl any specification.  Any person obtaining a copy of this software is
dnl requested to send their name and post office or electronic mail address to:
dnl   Pavel Curtis
dnl   Xerox PARC
dnl   3333 Coyote Hill Rd.
dnl   Palo Alto, CA 94304
dnl   Pavel@Xerox.Com
dnl
AC_INIT(Makefile.in)
AC_CONFIG_HEADER(config.h)

dnl ***************************************************************************
dnl	MOO_AUX
dnl Defines _POSIX_SOURCE if this machine is running A/UX; this appears to be
dnl necessary in order to get declarations of POSIX functions.
define(MOO_AUX, [
echo checking for A/UX
AC_PROGRAM_EGREP(yes, [
#if defined(AUX)
  yes
#endif
], AC_DEFINE(_POSIX_SOURCE))])

dnl ***************************************************************************
dnl	MOO_HPUX
dnl Defines _HPUX_SOURCE if this machine is running HP/UX; this appears to be
dnl necessary in order to get declarations of POSIX functions.
define(MOO_HPUX, [
echo checking for HP/UX
AC_PROGRAM_EGREP(yes, [
#if defined(__hpux)
  yes
#endif
], AC_DEFINE(_HPUX_SOURCE))])

dnl ***************************************************************************
dnl	MOO_ALPHA
dnl If this machine is a DEC Alpha running OSF/1, and we're not using GCC, then
dnl add `-Olimit 1000' to the `cc' switches, to allow the compiler to run the
dnl optimizer over large functions, like the main MOO interpreter loop.
define(MOO_ALPHA, [
echo checking for the DEC Alpha running OSF/1
AC_PROGRAM_EGREP(yes, [
#if defined(__osf__) && defined(__alpha) && !defined(__GNUC__)
  yes
#endif
], CC="$CC -Olimit 2500")])

dnl ***************************************************************************
dnl	MOO_SGI
dnl If this machine is an SGI running IRIX, and we're not using GCC, then
dnl add `-Olimit 2500' to the `cc' switches, to allow the compiler to run the
dnl optimizer over large functions, like the main MOO interpreter loop.  Also,
dnl even if we are using GCC, undefine __EXTENSIONS__ to keep from seeing a
dnl bunch of interfering declarations.
define(MOO_SGI, [
echo checking for the SGI compiler
AC_PROGRAM_EGREP(yes, [
#if defined(sgi) && !defined(__GNUC__)
  yes
#endif
], CC="$CC -Olimit 2500")
AC_PROGRAM_EGREP(yes, [
#if defined(sgi)
  yes
#endif
], CC="$CC -U__EXTENSIONS__")])

dnl ***************************************************************************
dnl	MOO_NEXT
dnl On NeXT, we need to make sure that _NEXT_SOURCE and _POSIX_SOURCE are
dnl defined.
define(MOO_NEXT, [
echo checking for NeXT
AC_PROGRAM_EGREP(yes, [
#ifdef NeXT
  yes
#endif
], AC_DEFINE(_NEXT_SOURCE)
   AC_DEFINE(_POSIX_SOURCE))])

dnl ***************************************************************************
dnl 	MOO_MALLOC_H
dnl Define NEED_MALLOC_H if `malloc()' is not declared in <stdlib.h> and
dnl <malloc.h> exists.
define(MOO_MALLOC_H, [
echo checking whether stdlib.h declares malloc and friends
MOO_FUNC_DECL_CHECK(stdlib.h, malloc, ,
	AC_HEADER_CHECK(malloc.h, AC_DEFINE(NEED_MALLOC_H)))])

dnl ***************************************************************************
dnl	MOO_FUNC_DECL_CHECK(header, func,
dnl			    if-declared [, if-not-declared[, extra-hdr]])
dnl Do `if-declared' is `func' is declared in `header', and if-not-declared
dnl otherwise.  If `extra-hdr' is provided, it is added after the #include of
dnl `header'.
define(MOO_FUNC_DECL_CHECK, [
changequote(,)dnl
pattern="[^_a-zA-Z0-9]$2 *\("
changequote([,])dnl
AC_PROGRAM_EGREP($pattern, [
#include <$1>
$5
], $3, $4)])

dnl ***************************************************************************
dnl 	MOO_NDECL_FUNCS(header, func1 func2 ...[, extra-hdr])
dnl Defines NDECL_func1, NDECL_func2, ... if they are not declared in header.
dnl
define(MOO_NDECL_FUNCS, [
changequote(,)dnl
trfrom='[a-z]' trto='[A-Z]'
changequote([,])dnl
for func in $2
do
echo "checking whether $func is declared in $1"
MOO_FUNC_DECL_CHECK($1, $func, ,
	AC_DEFINE(NDECL_`echo $func | tr "$trfrom" "$trto"`), $3)
done
])

dnl ***************************************************************************
dnl	MOO_VAR_DECL_CHECK(header, variable,
dnl			   if-declared [, if-not-declared[, extra-hdr]])
dnl Do `if-declared' is `variable' is declared in `header', and if-not-declared
dnl otherwise.  If `extra-hdr' is provided, it is added after the #include of
dnl `header'.
define(MOO_VAR_DECL_CHECK, [
changequote(,)dnl
pattern="[^_a-zA-Z0-9]$2"
changequote([,])dnl
AC_PROGRAM_EGREP($pattern, [
#include <$1>
$5
], $3, $4)])

dnl ***************************************************************************
dnl 	MOO_NDECL_VARS(header, var1 var2 ...[, extra-hdr])
dnl Defines NDECL_var1, NDECL_var2, ... if they are not declared in header.
dnl
define(MOO_NDECL_VARS, [
changequote(,)dnl
trfrom='[a-z]' trto='[A-Z]'
changequote([,])dnl
for var in $2
do
echo "checking whether $var is declared in $1"
MOO_VAR_DECL_CHECK($1, $var, ,
	AC_DEFINE(NDECL_`echo $var | tr "$trfrom" "$trto"`), $3)
done
])

dnl ***************************************************************************
dnl 	MOO_HEADER_STANDS_ALONE(header [, extra-code])
dnl Defines header_NEEDS_HELP if can't be compiled all by itself.
define(MOO_HEADER_STANDS_ALONE, [
changequote(,)dnl
trfrom='[a-z]./' trto='[A-Z]__'
changequote([,])dnl
AC_COMPILE_CHECK(self-sufficiency of $1, [
#include <$1>
$2
], , , AC_DEFINE(`echo $1 | tr "$trfrom" "$trto"`_NEEDS_HELP))
])

dnl ***************************************************************************
dnl	MOO_HAVE_FUNC_LIBS(func1 func2 ..., lib1 "lib2a lib2b" lib3 ...)
dnl For each `func' in turn, if `func' is defined using the current LIBS value,
dnl leave LIBS alone.  Otherwise, try adding each of the given libs to LIBS in
dnl turn, stopping when one of them succeeds in providing `func'.  Define
dnl HAVE_func if `func' is eventually found.
define(MOO_HAVE_FUNC_LIBS, [
for func in $1
do
  changequote(,)dnl
  trfrom='[a-z]' trto='[A-Z]'
  var=HAVE_`echo $func | tr "$trfrom" "$trto"`
  changequote([,])dnl
  AC_FUNC_CHECK($func, AC_DEFINE($var), [
    SAVELIBS="$LIBS"
    for lib in $2
    do
      LIBS="$LIBS $lib"
      AC_FUNC_CHECK($func, [AC_DEFINE($var)
			 break],
		    LIBS="$SAVELIBS")
    done
    ])
done
])

dnl ***************************************************************************
dnl	MOO_HAVE_HEADER_DIRS(header1 header2 ..., dir1 dir2 ...)
dnl For each `header' in turn, if `header' is found using the current CC value
dnl leave CC alone.  Otherwise, try adding each of the given `dir's to CC in
dnl turn, stopping when one of them succeeds in providing `header'.  Define
dnl HAVE_header if `header' is eventually found.
define(MOO_HAVE_HEADER_DIRS, [
for hdr in $1
do
  changequote(,)dnl
  trfrom='[a-z]./' trto='[A-Z]__'
  var=HAVE_`echo $hdr | tr "$trfrom" "$trto"`
  changequote([,])dnl
  AC_HEADER_CHECK($hdr, AC_DEFINE($var), [
    SAVECC="$CC"
    for dir in $2
    do
      CC="$CC $dir"
      AC_HEADER_CHECK($hdr, [AC_DEFINE($var)
			     break],
		      CC="$SAVECC")
    done
    ])
done
])

dnl ***************************************************************************
dnl	MOO_CONST
dnl Check whether or not the C compiler can cope with simple uses of the ANSI C
dnl `const' keyword, defining `const' as the empty string if it can't.
define(MOO_CONST, [
echo checking for a working const keyword
cat << EOF > conftest.c
#ifdef __GNUC__
#define const __const__
#endif
int foo(const char *x) { return 17 + (x - x); }
int bar() { int x = foo("foo"); return x; }
EOF
if $CC -c conftest.c > conftest.out 2>&1; then
  if test -s conftest.out; then
    AC_DEFINE(const,)
  fi
else
  AC_DEFINE(const,)
fi
rm -f conftest*
])

dnl ***************************************************************************
dnl	MOO_ANSI_C
dnl Check whether or not the C compiler handles ANSI C (i.e., allows function
dnl prototypes and the `void *' type) and try to make it do so by adding 
dnl command-line options like -Aa and -Xa, which some compilers require.  If
dnl nothing works, abort configuration.
define(MOO_ANSI_C, [
echo "checking that the C compiler handles important ANSI C constructs"
for opt in "" -Aa -Xa -ansi
do
SAVECC="$CC"
CC="$CC $opt"
AC_TEST_PROGRAM([
int main(int argc, char *argv) { void *ptr; exit(0); }
],
[have_ansi=1
break],
[CC="$SAVECC"])
done
if test -z "$have_ansi"; then
echo ""
echo "*** Sorry, but I can't figure out how to find an ANSI C compiler here."
echo "*** Compiling this program requires such a compiler."
exit 1
fi
])

dnl ***************************************************************************
dnl Start of actual configuration tests
dnl ***************************************************************************

AC_PROG_YACC
AC_PROG_CC
AC_GCC_TRADITIONAL
AC_PROGRAM_EGREP(yes, [
#if __GNUC__==2
  yes
#endif
], [CC="$CC -Wall -Wwrite-strings"])
test -n "$GCC" && CC="$CC -g"
AC_PROG_CPP
MOO_NEXT
MOO_ALPHA
MOO_SGI
AC_AIX
AC_ISC_POSIX
AC_MINIX
AC_SCO_INTL
MOO_AUX
MOO_HPUX
MOO_ANSI_C
MOO_CONST
CPP=""
AC_PROG_CPP
MOO_MALLOC_H
AC_HEADER_CHECK(sys/bsdtypes.h, AC_DEFINE(NEED_BSDTYPES_H))
AC_HEADER_CHECK(sys/select.h, AC_DEFINE(NEED_SELECT_H))
AC_HEADER_CHECK(memory.h, AC_DEFINE(NEED_MEMORY_H))
AC_PID_T
AC_MODE_T
AC_SIZE_T
AC_STRUCT_TM
AC_TIMEZONE
MOO_HAVE_FUNC_LIBS(sqrt, -lm /lib/libm.a "-static -lm")
MOO_HAVE_FUNC_LIBS(mkfifo waitpid sigemptyset, -lposix /lib/libposix.a)
MOO_HAVE_FUNC_LIBS(accept, "-lsocket -lnsl" -lsocket -linet)
MOO_HAVE_FUNC_LIBS(t_open, -lnsl -lnsl_s)
MOO_HAVE_FUNC_LIBS(crypt, -lcrypt -lcrypt_d)
AC_HAVE_HEADERS(unistd.h sys/cdefs.h stdlib.h tiuser.h machine/endian.h)
AC_HAVE_FUNCS(remove rename poll select strerror strftime strtoul matherr)
AC_HAVE_FUNCS(random lrand48 wait3 wait2 sigsetmask sigprocmask sigrelse)
MOO_NDECL_FUNCS(ctype.h, tolower)
MOO_NDECL_FUNCS(fcntl.h, fcntl)
MOO_NDECL_FUNCS(netinet/in.h, htonl)
MOO_NDECL_FUNCS(sys/ioctl.h, ioctl)
MOO_NDECL_FUNCS(poll.h, poll)
MOO_NDECL_FUNCS(signal.h, kill sigemptyset sigprocmask sigrelse)
MOO_NDECL_FUNCS(sys/socket.h, accept bind shutdown)
MOO_NDECL_FUNCS(sys/stat.h, fstat)
MOO_NDECL_FUNCS(stdio.h, fclose perror remove vfprintf)
MOO_NDECL_FUNCS(stdlib.h, random srandom strtod strtol strtoul)
MOO_NDECL_FUNCS(string.h, bzero memcpy memset strerror, [
#if NEED_MEMORY_H
#include <memory.h>
#endif
])
echo checking for bzero being declared in stdlib.h
MOO_FUNC_DECL_CHECK(stdlib.h, bzero, AC_DEFINE(BZERO_IN_STDLIB_H))
MOO_NDECL_FUNCS(sys/time.h, getitimer setitimer select, [
#if NEED_SELECT_H
#include <sys/types.h>
#include <sys/select.h>
#endif
])
MOO_NDECL_FUNCS(time.h, strftime time)
MOO_NDECL_VARS(time.h, tzname)
MOO_NDECL_FUNCS(tiuser.h, t_open)
MOO_NDECL_VARS(tiuser.h, t_errlist)
MOO_NDECL_FUNCS(unistd.h, fork)
MOO_NDECL_FUNCS(sys/wait.h, waitpid)

MOO_HEADER_STANDS_ALONE(arpa/inet.h, [struct in_addr foo;])
MOO_HEADER_STANDS_ALONE(signal.h)
MOO_HEADER_STANDS_ALONE(sys/socket.h)
MOO_HEADER_STANDS_ALONE(sys/stat.h)
MOO_HEADER_STANDS_ALONE(time.h)

dnl ***************************************************************************
echo checking for string.h declaring some functions incorrectly
echo "
#include <sys/types.h>
#include <string.h>
#if NEED_MEMORY_H
#include <memory.h>
#endif
" > conftest.c
$CC $DEFS conftest.c -o conftest $LIBS > conftest.out 2>&1
if grep "conflicting types for built-in function" conftest.out >/dev/null; then
  AC_DEFINE(USE_OWN_STRING_H)
fi
rm -f conftest*

dnl ***************************************************************************
echo "checking for incompatibility between <sys/ioctl.h> and <stropts.h>"
AC_TEST_CPP([
#include <sys/ioctl.h>
#include <stropts.h>
], , AC_DEFINE(UNDEF_IO_IN_STROPTS_H))

dnl ***************************************************************************
echo "checking whether or not fstat() can tell how much data is in a FIFO"
AC_TEST_PROGRAM([#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
main()
{
#ifdef NeXT
/* The NeXT claims to have FIFOs, but using them panics the kernel... */
  exit(-1);
#endif
  int	rfd, wfd, result; struct stat st;
  unlink("/tmp/conftest-fifo");
  result = (mknod("/tmp/conftest-fifo", 0666 | S_IFIFO, 0) < 0
	    || (rfd = open("/tmp/conftest-fifo", O_RDONLY | O_NDELAY)) < 0
	    || (wfd = open("/tmp/conftest-fifo", O_WRONLY)) < 0
	    || write(wfd, "foo", 3) != 3
	    || fstat(rfd, &st) < 0
	    || st.st_size != 3);
  unlink("/tmp/conftest-fifo");
  exit(result);
}
], AC_DEFINE(FSTAT_WORKS_ON_FIFOS))

dnl ***************************************************************************
echo "checking whether or not select() can be used on FIFOs"
AC_TEST_PROGRAM([#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifndef FD_ZERO
#define	NFDBITS		(sizeof(fd_set)*8)
#define	FD_ZERO(p)	bzero((char *)(p), sizeof(*(p)))
#define	FD_SET(n, p)	((p)->fds_bits[0] |= (1L<<((n)%NFDBITS)))
#define	FD_ISSET(n, p)	((p)->fds_bits[0] &  (1L<<((n)%NFDBITS)))
#endif /* FD_ZERO */
main()
{
#ifdef NeXT
/* The NeXT claims to have FIFOs, but using them panics the kernel... */
  exit(-1);
#endif
  int	rfd, wfd, result; fd_set input; struct timeval tv;
  tv.tv_sec = 2;
  tv.tv_usec = 0;
  unlink("/tmp/conftest-fifo");
  result = (mknod("/tmp/conftest-fifo", 0666 | S_IFIFO, 0) < 0
	    || (rfd = open("/tmp/conftest-fifo", O_RDONLY | O_NDELAY)) < 0
	    || (wfd = open("/tmp/conftest-fifo", O_WRONLY)) < 0
	    || (FD_ZERO(&input), FD_SET(rfd, &input),
		select(rfd + 1, &input, 0, 0, &tv) != 0)
	    || write(wfd, "foo", 3) != 3
	    || (FD_ZERO(&input), FD_SET(rfd, &input),
		select(rfd + 1, &input, 0, 0, &tv) != 1)
	    || !FD_ISSET(rfd, &input));
  unlink("/tmp/conftest-fifo");
  exit(result);
}
], AC_DEFINE(SELECT_WORKS_ON_FIFOS))

dnl ***************************************************************************
echo "checking whether or not poll() can be used on FIFOs"
AC_TEST_PROGRAM([#include <sys/types.h>
#include <poll.h>
#include <sys/stat.h>
#include <fcntl.h>
main()
{
  int	rfd, wfd, result; struct pollfd fds[1];
  unlink("/tmp/conftest-fifo");
  result = (mknod("/tmp/conftest-fifo", 0666 | S_IFIFO, 0) < 0
	    || (rfd = open("/tmp/conftest-fifo", O_RDONLY | O_NDELAY)) < 0
	    || (wfd = open("/tmp/conftest-fifo", O_WRONLY)) < 0
	    || write(wfd, "foo", 3) != 3
	    || (fds[0].fd = rfd, fds[0].events = POLLIN, poll(fds, 1, 1) != 1)
	    || (fds[0].revents & POLLIN) == 0);
  unlink("/tmp/conftest-fifo");
  exit(result);
}
], AC_DEFINE(POLL_WORKS_ON_FIFOS))

dnl ***************************************************************************
echo checking whether POSIX-style non-blocking I/O works
AC_TEST_PROGRAM([#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
handler(int sig) { }
main ()
{ /* Testing a POSIX feature, so assume FIFOs */
#ifdef NeXT
/* The NeXT claims to have FIFOs, but using them panics the kernel... */
  exit(-1);
#endif
  int	rfd, wfd, flags, result; char buffer[10];
  unlink("/tmp/conftest-fifo");
  signal(SIGALRM, handler);
  result = (mknod("/tmp/conftest-fifo", 0666 | S_IFIFO, 0) < 0
	    || (rfd = open("/tmp/conftest-fifo", O_RDONLY | O_NONBLOCK)) < 0
	    || (wfd = open("/tmp/conftest-fifo", O_WRONLY)) < 0
	    || (flags = fcntl(rfd, F_GETFL, 0)) < 0
	    || fcntl(rfd, F_SETFL, flags | O_NONBLOCK) < 0
	    || (alarm(3), read(rfd, buffer, 10) >= 0)
	    || (alarm(0), errno != EAGAIN));
  unlink("/tmp/conftest-fifo");
  exit(result);
}
], AC_DEFINE(POSIX_NONBLOCKING_WORKS))

dnl ***************************************************************************
echo checking which MOO networking configurations are likely to work...
define(MOO_ADD_NET_CONFIG,[
    NETWORK_CONFIGURATIONS="$NETWORK_CONFIGURATIONS $1"])
NETWORK_CONFIGURATIONS="NP_SINGLE"

AC_HEADER_CHECK(sys/socket.h, [
	MOO_ADD_NET_CONFIG(NS_BSD/NP_LOCAL)
	AC_PROGRAM_CHECK(have_telnet, telnet, yes, no)
        test x$have_telnet = xyes && MOO_ADD_NET_CONFIG(NS_BSD/NP_TCP)])
AC_PROGRAM_EGREP(yes-there-are-FIFOs, [#include <sys/stat.h>
#if defined(S_IFIFO) && !defined(NeXT) && \
    (SELECT_WORKS_ON_FIFOS || POLL_WORKS_ON_FIFOS || FSTAT_WORKS_ON_FIFOS)
	yes-there-are-FIFOs
#endif
], MOO_ADD_NET_CONFIG(NS_SYSV/NP_LOCAL))
AC_PROGRAM_EGREP(yes, [
#if HAVE_TIUSER_H && HAVE_T_OPEN && HAVE_POLL
yes
#endif
], test -r /dev/tcp && MOO_ADD_NET_CONFIG(NS_SYSV/NP_TCP))

echo "----------------------------------------------------------------------"
echo "| The following networking configurations will probably work on your"
echo "| system; any configuration *not* listed here almost certainly will"
echo "| *not* work on your system:"
echo "|"
echo "|   $NETWORK_CONFIGURATIONS"
echo "----------------------------------------------------------------------"

AC_OUTPUT(Makefile)

# $Log: configure.in,v $
# Revision 2.8  1996/03/19  07:16:46  pavel
# Added one more option for trying to enable ANSI C compilation.
# Release 1.8.0p2.
#
# Revision 2.7  1996/03/10  01:21:41  pavel
# Increased DEC Alpha -Olimit to 2500 from 1000.  Release 1.8.0.
#
# Revision 2.6  1996/02/11  00:43:22  pavel
# Added check for matherr().  Release 1.8.0beta2.
#
# Revision 2.5  1996/02/08  07:22:30  pavel
# Added checks for SGI machines and for strtod() being undeclared.  Updated
# copyright notice for 1996.  Release 1.8.0beta1.
#
# Revision 2.4  1996/01/11  07:47:54  pavel
# Added a handy form-feed between the macro definitions and the main script,
# to make it easier to navigate with Emacs.  Release 1.8.0alpha5.
#
# Revision 2.3  1995/12/31  03:17:07  pavel
# Added test for <sys/stat.h> needing help.  Release 1.8.0alpha4.
#
# Revision 2.2  1995/12/28  00:49:41  pavel
# On NeXT, we now define _POSIX_SOURCE too.  Release 1.8.0alpha3.
#
# Revision 2.1  1995/12/11  08:05:45  pavel
# Added support for finding `crypt()' in `-lcrypt'.  Release 1.8.0alpha2.
#
# Revision 2.0  1995/11/30  05:09:41  pavel
# New baseline version, corresponding to release 1.8.0alpha1.
#
# Revision 1.5  1992/10/28  01:56:41  pavel
# Fixed NDECL test to look for `vfprintf' instead of the unused `vprintf'...
#
# Revision 1.4  1992/10/23  23:13:18  pavel
# Added copyright notice.
#
# Revision 1.3  1992/10/23  19:23:52  pavel
# Added MOO_AUX, MOO_MALLOC_H, MOO_FUNC_DECL_CHECK.
# Generalized MOO_HAVE_FUNC_LIBS to take multiple function names.
# Refined MOO_CONST to check for warnings about `reserved' keywords.
# Added MOO_NDECL_FUNCS checks for sigemptyset, perror, remove, vprintf,
# bzero, memset, fork, fstat, and waitpid.
# Simplified test for conflicting built-in function declarations.
# Added SELECT_WORKS_ON_FIFOS and POSIX_NONBLOCKING_WORKS tests.
#
# Revision 1.2  1992/10/21  03:09:41  pavel
# Added this log.

# Local Variables:
# mode: c
# End: