dnl Process this file with autoconf to produce a configure script.
dnl
dnl We might want AC_WORDS_BIGENDIAN in the future.
dnl We might want AC_CHAR_UNSIGNED in the future.
dnl

define(S48_POSIX_LIBC, [dnl
echo checking for RISC/OS POSIX library lossage
if test -f /usr/posix/usr/lib/libc.a; then
  LIBS="${LIBS} /usr/posix/usr/lib/libc.a"
fi
])dnl
dnl
dnl Run AC_PROG_CC, but don't accept it's changes to CFLAGS.
dnl For some insane reason, it sets CFLAGS to either `-O' or `-g -O' for gcc.
dnl I don't want the silly -g (because if you are using nlist, you can't strip
dnl the binary), I want -O2 for gcc and -O for other C compilers.
define(S48_PROG_CC, [dnl
	oldCFLAGS="$CFLAGS"
	AC_PROG_CC
	if test "z$oldCFLAGS" = z; then
		if test "z$GCC" = z; then
			CFLAGS='-O'
		else
			CFLAGS='-O2'
		fi
	fi
])dnl
dnl
dnl Linux/ELF systems need the -rdynamic flag when linking so that
dnl dlsym() can find symbols in the executable.
dnl Note, on some Sun's, you can link with -rdynamic but the resulting
dnl a.out always core dumps.
define(S48_RDYNAMIC, [dnl
	AC_MSG_CHECKING([link with -rdynamic])
	AC_RUN_IFELSE(AC_LANG_PROGRAM([
#include <stdio.h> 
#include <dlfcn.h>
int export_test = 0;],
[
#ifndef RTLD_LAZY
#define RTLD_LAZY 0
#endif

#ifndef RTLD_GLOBAL
#define RTLD_GLOBAL 0
#endif

	void *dlhandle;
	void *intp;
	char *err;

	dlhandle = dlopen(NULL, RTLD_LAZY | RTLD_GLOBAL);

	if ((err = dlerror()) != NULL) {
		return 1;
	}

	(void *)intp = dlsym(dlhandle, "export_test");
	
	if ((err = dlerror()) != NULL) {
		return 1;
	}

	return 0;


]),
		[AC_MSG_RESULT(no)],
		[AC_MSG_RESULT(yes)
			LDFLAGS="$LDFLAGS -rdynamic"])
])dnl
dnl
define(S48_USCORE, [dnl
	AC_MSG_CHECKING([underscore before symbols])
	echo 'main() { return 0; } fnord() {}' >conftest.c
	if ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS} -o a.out conftest.c ${LIBS} &&
	nm a.out | grep _fnord >/dev/null; then
		AC_MSG_RESULT([yes])
		AC_DEFINE(USCORE, 1, [Define to 1 if symbols start with _])
	else
		AC_MSG_RESULT([no])
	fi
	rm -f conftest.c a.out
])dnl
dnl
dnl -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
AC_DEFUN(SCSH_TZNAME,[
  AC_MSG_CHECKING(for tzname)
  AC_CACHE_VAL(scsh_cv_tzname,[
    AC_TRY_COMPILE([#include <time.h>], 
		   [return (int) tzname;],
                   scsh_cv_tzname=yes,
                   scsh_cv_tzname=no)])
  AC_MSG_RESULT($scsh_cv_tzname)
  if test $scsh_cv_tzname = yes; then
    AC_DEFINE(HAVE_TZNAME)
  fi
])

dnl -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
AC_DEFUN(SCSH_ELF, [
  AC_MSG_CHECKING(for ELF)
  AC_CACHE_VAL(scsh_cv_elf,[
    touch conftest.c
    if ${CC} -v -o a.out conftest.c 2>&1 | grep -q __ELF__ ; then
      scsh_cv_elf=yes
    else
      scsh_cv_elf=no
    fi])
  AC_MSG_RESULT($scsh_cv_elf)
  rm -f conftest.c a.out
])
dnl -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
AC_DEFUN(SCSH_SIG_NRS, [
  AC_MSG_RESULT([defining signal constants])	
  ${CC} -o scsh_aux scsh/scsh_aux.c
  AC_DEFINE_UNQUOTED(SIGNR_1, `./scsh_aux 1`, [scsh interrupt for signal 1])
  AC_DEFINE_UNQUOTED(SIGNR_2, `./scsh_aux 2`, [scsh interrupt for signal 2])
  AC_DEFINE_UNQUOTED(SIGNR_3, `./scsh_aux 3`, [scsh interrupt for signal 3])
  AC_DEFINE_UNQUOTED(SIGNR_4, `./scsh_aux 4`, [scsh interrupt for signal 4])
  AC_DEFINE_UNQUOTED(SIGNR_5, `./scsh_aux 5`, [scsh interrupt for signal 5])
  AC_DEFINE_UNQUOTED(SIGNR_6, `./scsh_aux 6`, [scsh interrupt for signal 6])
  AC_DEFINE_UNQUOTED(SIGNR_7, `./scsh_aux 7`, [scsh interrupt for signal 7])
  AC_DEFINE_UNQUOTED(SIGNR_8, `./scsh_aux 8`, [scsh interrupt for signal 8])
  AC_DEFINE_UNQUOTED(SIGNR_9, `./scsh_aux 9`, [scsh interrupt for signal 9])
  AC_DEFINE_UNQUOTED(SIGNR_10, `./scsh_aux 10`, [scsh interrupt for signal 10])
  AC_DEFINE_UNQUOTED(SIGNR_11, `./scsh_aux 11`, [scsh interrupt for signal 11])
  AC_DEFINE_UNQUOTED(SIGNR_12, `./scsh_aux 12`, [scsh interrupt for signal 12])
  AC_DEFINE_UNQUOTED(SIGNR_13, `./scsh_aux 13`, [scsh interrupt for signal 13])
  AC_DEFINE_UNQUOTED(SIGNR_14, `./scsh_aux 14`, [scsh interrupt for signal 14])
  AC_DEFINE_UNQUOTED(SIGNR_15, `./scsh_aux 15`, [scsh interrupt for signal 15])
  AC_DEFINE_UNQUOTED(SIGNR_16, `./scsh_aux 16`, [scsh interrupt for signal 16])
  AC_DEFINE_UNQUOTED(SIGNR_17, `./scsh_aux 17`, [scsh interrupt for signal 17])
  AC_DEFINE_UNQUOTED(SIGNR_18, `./scsh_aux 18`, [scsh interrupt for signal 18])
  AC_DEFINE_UNQUOTED(SIGNR_19, `./scsh_aux 19`, [scsh interrupt for signal 19])
  AC_DEFINE_UNQUOTED(SIGNR_20, `./scsh_aux 20`, [scsh interrupt for signal 20])
  AC_DEFINE_UNQUOTED(SIGNR_21, `./scsh_aux 21`, [scsh interrupt for signal 21])
  AC_DEFINE_UNQUOTED(SIGNR_22, `./scsh_aux 22`, [scsh interrupt for signal 22])
  AC_DEFINE_UNQUOTED(SIGNR_23, `./scsh_aux 23`, [scsh interrupt for signal 23])
  AC_DEFINE_UNQUOTED(SIGNR_24, `./scsh_aux 24`, [scsh interrupt for signal 24])
  AC_DEFINE_UNQUOTED(SIGNR_25, `./scsh_aux 25`, [scsh interrupt for signal 25])
  AC_DEFINE_UNQUOTED(SIGNR_26, `./scsh_aux 26`, [scsh interrupt for signal 26])
  AC_DEFINE_UNQUOTED(SIGNR_27, `./scsh_aux 27`, [scsh interrupt for signal 27])
  AC_DEFINE_UNQUOTED(SIGNR_28, `./scsh_aux 28`, [scsh interrupt for signal 28])
  AC_DEFINE_UNQUOTED(SIGNR_29, `./scsh_aux 29`, [scsh interrupt for signal 29])
  AC_DEFINE_UNQUOTED(SIGNR_30, `./scsh_aux 30`, [scsh interrupt for signal 30])
  AC_DEFINE_UNQUOTED(SIGNR_31, `./scsh_aux 31`, [scsh interrupt for signal 31])
  rm -f scsh_aux scsh_aux.exe	
])
dnl -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
AC_DEFUN(SCSH_LINUX_STATIC_DEBUG, [
  case "$host" in
    *-*-linux* )
    AC_MSG_CHECKING(for broken Linux that needs -static with -g)
    AC_CACHE_VAL(scsh_cv_linux_static_debug,[
      AC_TRY_LINK([],
  		  [],
  		  scsh_cv_linux_static_debug=no,
  		  scsh_cv_linux_static_debug=yes)])
    AC_MSG_RESULT($scsh_cv_linux_static_debug)
    if test $scsh_cv_linux_static_debug = yes; then
      LDFLAGS="-static ${LDFLAGS}"
    fi
  ;;
  esac
])

dnl -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
AC_DEFUN(SCSH_CONST_SYS_ERRLIST,[
  AC_MSG_CHECKING(for const sys_errlist)
  AC_CACHE_VAL(scsh_cv_const_sys_errlist,[
    AC_TRY_COMPILE([#include <errno.h>
                    #include <unistd.h>], 
		   [const extern char *sys_errlist[];],
                   scsh_cv_const_sys_errlist=yes,
                   scsh_cv_const_sys_errlist=no)])
  AC_MSG_RESULT($scsh_cv_const_sys_errlist)
  if test $scsh_cv_const_sys_errlist = yes; then
    AC_DEFINE(HAVE_CONST_SYS_ERRLIST, 1, [const char* sys_errlist])
  fi
])

dnl -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
AC_DEFUN(SCSH_SOCKLEN_T,[
     AC_MSG_CHECKING(for socklen_t)
     AC_TRY_COMPILE([#include <sys/socket.h>
                     socklen_t x;
                    ],[],[AC_MSG_RESULT(yes)],[
                          AC_TRY_COMPILE([#include <sys/socket.h>
                                          int accept (int, struct sockaddr *, size_t *);
                                         ],[],[
                                              AC_MSG_RESULT(size_t)
                                         AC_DEFINE(socklen_t,
					size_t, [Define to type of socklen_t])], [
                   AC_MSG_RESULT(int)
                   AC_DEFINE(socklen_t,int)])])
])
dnl -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
AC_INIT(c/scheme48vm.c)
     AC_CONFIG_HEADER(c/sysdep.h)
     AC_CANONICAL_HOST
     S48_PROG_CC
     SCSH_SIG_NRS
     AC_ISC_POSIX
     SCSH_LINUX_STATIC_DEBUG	
     dnl set the cross-compile flag before we try anything.
     AC_TRY_RUN([int main() { return 0;}], [], [], [true])
     AC_PROG_INSTALL
     AC_PROG_RANLIB
     AC_C_CONST

     AC_C_BIGENDIAN
     if test $ac_cv_c_bigendian = no ; then
       ENDIAN=little
     else
       ENDIAN=big
     fi

     AR=${AR-"ar cq"}
     TMPDIR=${TMPDIR-"/var/tmp"}
     case "$host" in
  ## CX/UX
  m88k-harris-cxux* )
    dir=cxux
    CC="cc -Xa"
    CFLAGS="-O"
    LDFLAGS="-O -Wl,-Bexport"
    AC_DEFINE(HAVE_HARRIS, 1, [Define to 1 on m88k-harris-cxux])
  ;;
    
  ## DEC Ultrix
  mips-dec-ultrix* )
    AC_MSG_ERROR("Ultrix is not supported.")
  ;;

  ## HP 9000 series 700 and 800, running HP/UX
  hppa*-hp-hpux* )
    dir=hpux
    LDFLAGS="-Wl,-E"
    if test ${CC} = cc; then
      CFLAGS="-Ae -O +Obb1800"
    fi
    AC_DEFINE(_HPUX_SOURCE, 1, [Define to 1 to compile on HP/UX])
    AC_DEFINE(hpux, 1, [Define to 1 on HP/UX])
    AC_DEFINE(_XOPEN_SOURCE_EXTENDED, 1, [Define to 1 to compile on HP/UX])
  ;;
 
  ## IBM AIX
     rs6000-ibm-aix*|powerpc-ibm-aix* )
     dir=aix
     LDFLAGS="-O"
     if test ${CC} = gcc; then
       LDFLAGS_AIX="-Xlinker -bexport:exportlist.aix"
     else
       LDFLAGS_AIX="-bexport:exportlist.aix"
     fi
     CFLAGS="-O"
     AIX_P="exportlist.aix"
     ;;

  ## Linux
  *-*-linux* )
  dir=linux
  # gross, but needed for some older a.out systems for 0.4.x
  LIBS=-lc
  SCSH_ELF
  ;;

  ## NetBSD and FreeBSD ( and maybe 386BSD also)
  *-*-*bsd*|*-*-darwin* )
  dir=bsd
  SCSH_ELF
  ;;

  ## NeXT
  *-next-* )
    dir=next
    CC="$CC -posix"
    AC_DEFINE(HAVE_SIGACTION)
  ;;
  
  ## SGI IRIX
  mips-sgi-irix* )
    dir=irix
    S48_CFLAG_CKR
    INSTALL='$(srcdir)/install-sh'
  ;;

  ## SunOS
  sparc*-sun-sunos* )
   dir=sunos
  ;;
  
  ## Solaris - Sparc and i386
    *-*-solaris* )
    dir=solaris
    AC_DEFINE(HAVE_NLIST)
    ;;
  
  ## NT - cygwin32
  *-*-cygwin* )
    AC_DEFINE(CYGWIN, 1, [Define to 1 on cygwin])
    dir=cygwin32
    EXEEXT=".exe"
  ;;
  
  ## The GNU Hurd
  *-*-gnu* )
  machine=gnu
  SCSH_ELF
  ;;

  ## Generic Configuration
  * )
  dir=generic
  echo "WARNING: "
  echo "WARNING: Using generic configuration."
  echo "WARNING: See doc/porting.txt for more information."
  echo "WARNING: "
  ;;
esac
     (cd $srcdir/scsh &&  rm -rf machine && ln -s $dir machine)

     AC_CHECK_LIB(m, main)
     AC_CHECK_LIB(dl, main)
     AC_CHECK_LIB(mld, main)
     AC_CHECK_LIB(nsl, main)
     AC_CHECK_LIB(gen, main)
     AC_CHECK_LIB(socket, main)
     AC_CHECK_LIB(sun, getpwnam)
     AC_CHECK_LIB(c, crypt, [true], AC_CHECK_LIB(crypt, crypt))
     dnl Solaris 2.3 seems to need -lelf for nlist().  (tnx Bryan O'Sullivan)
     AC_CHECK_LIB(elf, main)
     S48_POSIX_LIBC
     AC_CONST
     AC_RETSIGTYPE
     AC_CHECK_HEADERS(libgen.h sys/timeb.h posix/time.h sys/select.h nlist.h)
     AC_CHECK_HEADERS(sys/un.h)
     AC_CHECK_HEADERS(crypt.h)	
     AC_CHECK_FUNCS(gettimeofday ftime nlist select setitimer sigaction vasprintf)
     SCSH_SOCKLEN_T	
     AC_CHECK_FUNC(dlopen, [AC_DEFINE(HAVE_DLOPEN, 
				1, [Define to 1 if the interface to the dynamic linker exists])
                            have_dlopen="yes"],
			   [AC_CHECK_FUNC(nlist, [AC_LIBOBJ([c/fake/libdl1])],
	       					 [AC_LIBOBJ([c/fake/libdl2])])
                            have_dlopen="no"])
     AC_CHECK_FUNCS(socket chroot)
     AC_CHECK_FUNC(strerror, AC_DEFINE(HAVE_STRERROR, 
					1, [Define to 1 if you have the strerror function]),
			      [AC_LIBOBJ([c/fake/strerror])])

     AC_CHECK_FUNC(seteuid, [AC_DEFINE(HAVE_SETEUID, 
					1, [Define to 1 if you have the seteuid function])],
 	[AC_CHECK_FUNC(setreuid, [AC_DEFINE(HAVE_SETREUID, 
						1, [Define to 1 if you have the setreuid function])],
 	[AC_MSG_ERROR("Neither setegid nor setregid defined. Cannot continue.")])])

     AC_CHECK_FUNC(setegid, [AC_DEFINE(HAVE_SETEGID, 
					1, [Define to 1 if you have the setegid function])],
 	[AC_CHECK_FUNC(setregid, [AC_DEFINE(HAVE_SETREGID, 
						1, [Define to 1 if you have the setregid function])], 
         	[AC_MSG_ERROR("Neither setegid nor setregid defined. Cannot continue.")])])


     AC_CHECK_MEMBER(struct nlist.n_name,
	[AC_DEFINE(NLIST_HAS_N_NAME, 1, [Define to 1 if struct nlist.n_name exists])],,
	[#include <nlist.h>])
     AC_MSG_CHECKING([__NEXT__])
     AC_TRY_LINK(,[
#ifdef	__NeXT__
return 0;
#else
fail
#endif
],
		CC="$CC -posix"
		AC_DEFINE(HAVE_SIGACTION)
		AC_MSG_RESULT([yes]),
		AC_MSG_RESULT([no]))
     S48_USCORE
     if test $have_dlopen = yes; then
        S48_RDYNAMIC
     fi
     AC_STRUCT_TIMEZONE
     AC_CHECK_MEMBER(struct tm.tm_gmtoff,
	AC_DEFINE(HAVE_GMTOFF, 1, [Define to 1 if struct tm has member tm_gmtoff]))
	
     SCSH_CONST_SYS_ERRLIST	
     CFLAGS1=${CFLAGS}

     lib_dirs_list='("${prefix}/lib/scsh/modules")'
     AC_ARG_WITH(lib-dirs-list,
                 AC_HELP_STRING([--with-lib-dirs-list],
                                [list of default scsh library directories (default ("$prefix/lib/scsh/modules"))]),
                 lib_dirs_list="$withval")

     AC_SUBST(lib_dirs_list)

     AC_SUBST(CFLAGS)
     AC_SUBST(LDFLAGS)
	

     AC_SUBST(AIX_P)
     AC_SUBST(AR)
     AC_SUBST(CC)
     AC_SUBST(CFLAGS)
     AC_SUBST(CFLAGS1)
     AC_SUBST(EXEEXT)
     AC_SUBST(ENDIAN)
     AC_SUBST(LDFLAGS)
     AC_SUBST(LDFLAGS_AIX)
     AC_SUBST(LIBS)
     AC_SUBST(TMPDIR)

    
AC_CONFIG_FILES(Makefile scsh/endian.scm scsh-config)
AC_CONFIG_COMMANDS([scsh-config+x],[chmod +x scsh-config])
AC_OUTPUT