dnl Process this file with autoconf to produce a configure script.
AC_INIT(ruby.h)

PROGS="ruby"
AC_SUBST(PROGS)dnl

dnl checks for alternative programs
AC_ARG_WITH(gcc, [--without-gcc             never use gcc], [
	case $withval in
	no)	CC=cc
		without_gcc=yes;;
	yes)	CC=gcc
		without_gcc=no;;
	*)	CC=$withval
		without_gcc=$withval;;
	esac], [without_gcc=no])
dnl If the user switches compilers, we can't believe the cache
if test ! -z "$ac_cv_prog_CC" -a ! -z "$CC" -a "$CC" != "$ac_cv_prog_CC"
then
  AC_ERROR(cached CC is different -- throw away $cache_file
(it is also a good idea to do 'make clean' before compiling))
fi

dnl checks for thread
rb_thread=yes
AC_ARG_ENABLE(thread, [--disable-thread          never use user-level thread], [
	rb_thread=$enableval
])
if test $rb_thread = yes; then
  AC_DEFINE(THREAD)
fi

AC_CANONICAL_HOST

dnl Checks for programs.
AC_PROG_CC
AC_PROG_GCC_TRADITIONAL
AC_PROG_YACC
AC_PROG_INSTALL
AC_PROG_MAKE_SET

# checks for UNIX variants that set C preprocessor variables
AC_MINIX

dnl Checks for libraries.
AC_CHECK_LIB(crypt, crypt)
AC_CHECK_LIB(dl, dlopen)	# Dynamic linking for SunOS/Solaris and SYSV
AC_CHECK_LIB(dld, shl_load)	# Dynamic linking for HP-UX

dnl Checks for header files.
AC_HEADER_DIRENT
AC_HEADER_STDC
AC_CHECK_HEADERS(unistd.h limits.h sys/file.h sys/ioctl.h pwd.h sys/select.h\
		 sys/time.h sys/times.h sys/param.h sys/wait.h\
		 syscall.h a.out.h string.h utime.h memory.h)

dnl Checks for typedefs, structures, and compiler characteristics.
AC_TYPE_UID_T
AC_TYPE_SIZE_T
AC_STRUCT_ST_BLKSIZE
AC_STRUCT_ST_BLOCKS
AC_STRUCT_ST_RDEV

dnl Checks for library functions.
AC_TYPE_GETGROUPS
AC_TYPE_SIGNAL
AC_FUNC_ALLOCA
AC_FUNC_VFORK
AC_REPLACE_FUNCS(dup2 setenv memmove mkdir strerror strftime\
		 strstr strtoul strdup strcasecmp crypt flock)
AC_CHECK_FUNCS(fmod killpg random wait4 waitpid syscall getcwd\
	      truncate chsize times utimes fcntl lockf setitimer\
	      setruid seteuid setreuid setrgid setegid setregid\
	      getgroups getpgid getpriority dlopen sigprocmask sigaction)
if test "$ac_cv_func_strftime" = no; then
    AC_STRUCT_TIMEZONE
    AC_TRY_LINK([],
	 [extern int daylight; int i = daylight;], AC_DEFINE(HAVE_DAYLIGHT))
fi

if test "$ac_cv_func_sigprocmask" = yes && test "$ac_cv_func_sigaction" = yes; then
   AC_DEFINE(POSIX_SIGNAL)
else
  AC_MSG_CHECKING(for BSD signal semantics)
  AC_CACHE_VAL(rb_cv_bsd_signal,
  [AC_TRY_RUN([
#include <stdio.h>
#include <signal.h>

void sig_handler(dummy)
     int dummy;
{
}

int main(argc, argv)
     int argc;
     char ** argv;
{
  signal(SIGINT, sig_handler);
  kill(getpid(), SIGINT);
  kill(getpid(), SIGINT);
  return 0;
}
],
	rb_cv_bsd_signal=yes,
	rb_cv_bsd_signal=no,
	[:])])
  AC_MSG_RESULT($rb_cv_bsd_signal)
  if test "$rb_cv_bsd_signal" = yes; then
    AC_DEFINE(BSD_SIGNAL)
  fi
fi

AC_C_BIGENDIAN
AC_CHAR_UNSIGNED

AC_MSG_CHECKING([count field in FILE structures])
AC_CACHE_VAL(rb_cv_fcnt,
[AC_TRY_COMPILE([#include <stdio.h>],
	[FILE *f = stdin; f->_cnt = 0;], rb_cv_fcnt="_cnt", )
if test "$rb_cv_fcnt" = ""; then
    AC_TRY_COMPILE([#include <stdio.h>],
	[FILE *f = stdin; f->__cnt = 0;], rb_cv_fcnt="__cnt", )
fi
if test "$rb_cv_fcnt" = ""; then
    AC_TRY_COMPILE([#include <stdio.h>],
	[FILE *f = stdin; f->_r = 0;], rb_cv_fcnt="_r", )
fi
if test "$rb_cv_fcnt" = ""; then
    AC_TRY_COMPILE([#include <stdio.h>],
	[FILE *f = stdin; f->readCount = 0;],
	rb_cv_fcnt="readCount", rb_cv_fcnt="not found")
fi])
if test "$rb_cv_fcnt" = "not found"; then
  AC_MSG_RESULT([not found(OK if using GNU libc)])
else
  AC_MSG_RESULT($rb_cv_fcnt)
  AC_DEFINE_UNQUOTED(FILE_COUNT, $rb_cv_fcnt)
fi

if test "$ac_cv_func_getpwent" = yes; then
  AC_MSG_CHECKING(struct passwd)
  AC_EGREP_HEADER(pw_change, pwd.h, AC_DEFINE(PW_CHANGE))
  AC_EGREP_HEADER(pw_quota, pwd.h, AC_DEFINE(PW_QUOTA))
  AC_EGREP_HEADER(pw_age, pwd.h, AC_DEFINE(PW_AGE))
  AC_EGREP_HEADER(pw_class, pwd.h, AC_DEFINE(PW_CLASS))
  AC_EGREP_HEADER(pw_comment, pwd.h, AC_DEFINE(PW_COMMENT))
  AC_EGREP_HEADER(pw_expire, pwd.h, AC_DEFINE(PW_EXPIRE))
  AC_MSG_RESULT(done)
fi

dnl wheather use dln_a_out ot not
AC_ARG_WITH(dln-a-out, [--with-dln-a-out          use dln_a_out if possible], [
	case $withval in
	yes) with_dln_a_out=yes;;
	*)   with_dln_a_out=no;;
	esac], [with_dln_a_out=no])

case "$host_os" in
    linux*)
  AC_MSG_CHECKING(whether ELF binaries are produced)
  AC_CACHE_VAL(rb_cv_linux_elf,
  [AC_TRY_RUN([
/* Test for whether ELF binaries are produced */
#include <fcntl.h>
#include <stdlib.h>
main() {
	char buffer[4];
	int i=open("conftest",O_RDONLY);
	if(i==-1)
		exit(1); /* fail */
	if(read(i,&buffer[0],4)<4)
		exit(1); /* fail */
	if(buffer[0] != 127 || buffer[1] != 'E' ||
           buffer[2] != 'L' || buffer[3] != 'F')
		exit(1); /* fail */
	exit(0); /* succeed (yes, it's ELF) */
}
],
	rb_cv_linux_elf=yes,
	rb_cv_linux_elf=no,
	[:])])
  AC_MSG_RESULT($rb_cv_linux_elf)
  if test "$rb_cv_linux_elf" = no; then
    with_dln_a_out=yes
  else
    LDFLAGS="-rdynamic"
  fi;;
esac

AC_SUBST(DLDFLAGS)dnl

AC_SUBST(STATIC)dnl
AC_SUBST(CCDLFLAGS)dnl
AC_SUBST(LDSHARED)dnl
AC_SUBST(DLEXT)dnl

STATIC=

if test "$with_dln_a_out" != yes; then
  rb_cv_dlopen=unknown
  AC_MSG_CHECKING(whether OS depend dynamic link works)
  if test "$GCC" = yes; then
    CCDLFLAGS=-fpic
  else
    case "$host_os" in
	hpux*)	CCDLFLAGS='+z';;
	solaris*|irix*)	CCDLFLAGS='-K pic' ;;
	sunos*)		CCDLFLAGS='-pic' ;;
	svr4*|esix*) 	CCDLFLAGS='-Kpic' ;;
	*)		CCDLFLAGS='' ;;
    esac
  fi

  case "$host_os" in
	hpux*)		DLDFLAGS="-E"
			LDSHARED='ld -b'
			LDFLAGS="-Wl,-E"
			rb_cv_dlopen=yes;;
	solaris*) 	LDSHARED='ld -G'
			rb_cv_dlopen=yes;;
	sunos*) 	LDSHARED='ld -assert nodefinitions'
			rb_cv_dlopen=yes;;
	svr4*|esix*) 	LDSHARED="ld -G"
			rb_cv_dlopen=yes ;;
	linux*) 	LDSHARED="gcc -shared"
			rb_cv_dlopen=yes ;;
	freebsd*) 	LDSHARED="ld -Bshareable"
			rb_cv_dlopen=yes ;;
	*) 		LDSHARED='ld' ;;
  esac
  AC_MSG_RESULT($rb_cv_dlopen)
fi

dln_a_out_works=no
if test "$ac_cv_header_a_out_h" = yes; then
  if test "$with_dln_a_out" = yes || test "$rb_cv_dlopen" = unknown; then
    AC_MSG_CHECKING(whether matz's dln works)
    cat confdefs.h > config.h
    AC_CACHE_VAL(rb_cv_dln_a_out,
    [AC_TRY_COMPILE([
#define USE_DLN_A_OUT
#include "dln.c"
],
	[], 
	rb_cv_dln_a_out=yes,
	rb_cv_dln_a_out=no)])
    AC_MSG_RESULT($rb_cv_dln_a_out)
    if test "$rb_cv_dln_a_out" = yes; then
      dln_a_out_works=yes
      AC_DEFINE(USE_DLN_A_OUT)
    fi
  fi
fi

if test "$dln_a_out_works" = yes; then
  if test "$GCC" = yes; then
    STATIC=-static
  else
    STATIC=-Bstatic
  fi
  DLEXT=o
  AC_DEFINE(DLEXT, ".o")
  CCDLFLAGS=
else
  case "$host_os" in
    hpux*)	DLEXT=sl
	 	AC_DEFINE(DLEXT, ".sl");;
    nextstep*)	DLEXT=o
	 	AC_DEFINE(DLEXT, ".o");;
    *)		DLEXT=so
    		AC_DEFINE(DLEXT, ".so");;
  esac
fi

AC_SUBST(STRIP)dnl
if test "$with_dln_a_out" = yes; then
  STRIP=true
else
  STRIP=strip
fi

case "$host_os" in
  linux*)
	STRIP='strip -S -x';;
  nextstep*)
	STRIP='strip -A -n';;
esac

EXTSTATIC=
AC_SUBST(EXTSTATIC)dnl
AC_ARG_WITH(static-linked-ext,
	    [--with-static-linked-ext  link external modules statically],
            [case $withval in
	     yes) STATIC=
		  EXTSTATIC=static;;
	     *)	;;
	     esac])

if test "$prefix" = NONE; then
  prefix=$ac_default_prefix
fi
AC_DEFINE_UNQUOTED(RUBY_LIB, "${prefix}/lib/ruby:.")
AC_SUBST(archlib)dnl
archlib="${prefix}/lib/ruby/${host_cpu}-${host_os}"
AC_DEFINE_UNQUOTED(RUBY_ARCHLIB, "$archlib")

echo "creating config.h"
cat confdefs.h > config.h

AC_OUTPUT(Makefile ext/extmk.rb)