dnl configure.in
dnl
dnl Process this file with autoconf to produce a configure script.
dnl
dnl Copyright (C) 1996 John W. Eaton
### 
### This file is part of Octave.
### 
### Octave is free software; you can redistribute it and/or modify it
### under the terms of the GNU General Public License as published by the
### Free Software Foundation; either version 2, or (at your option) any
### later version.
### 
### Octave is distributed in the hope that it will be useful, but WITHOUT
### ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
### FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
### for more details.
### 
### You should have received a copy of the GNU General Public License
### along with Octave; see the file COPYING.  If not, write to the Free
### Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

AC_REVISION($Revision: 1.192 $)
AC_PREREQ(2.9)
AC_INIT(src/octave.cc)
AC_CONFIG_HEADER(config.h)

AC_DEFINE(OCTAVE_SOURCE, 1)

AC_CANONICAL_HOST
if test -z "$host"; then
  host=unknown
fi
target_host_type=$host
canonical_host_type=$host
if test "$host" = unknown; then
  AC_MSG_WARN([configuring Octave for unknown system type
])
fi
AC_SUBST(target_host_type)

### some defaults

AC_PREFIX_DEFAULT(/usr/local)

exec_prefix='$(prefix)'
bindir='$(exec_prefix)/bin'
datadir='$(prefix)/share'
libdir='$(exec_prefix)/lib'
libexecdir='$(exec_prefix)/libexec'
includedir='$(prefix)/include/octave-$(version)'
mandir='$(prefix)/man/man1'
infodir='$(prefix)/info'
fcnfiledir='$(datadir)/octave/$(version)/m'
localfcnfiledir='$(datadir)/octave/site/m'
localfcnfilepath='$(localfcnfiledir)//'
archlibdir='$(libexecdir)/octave/$(version)/exec/$(target_host_type)'
octfiledir='$(libexecdir)/octave/$(version)/oct/$(target_host_type)'
localoctfiledir='$(libexecdir)/octave/site/oct/$(target_host_type)'
localoctfilepath='$(localoctfiledir)//'
fcnfilepath='.:$(localoctfilepath):$(localfcnfilepath):$(octfiledir)//:$(fcnfiledir)//'
imagedir='$(datadir)/octave/$(version)/imagelib'
imagepath='.:$(imagedir)//'

AC_MSG_RESULT([defining prefix to be $prefix])
AC_MSG_RESULT([defining exec_prefix to be $exec_prefix])
AC_MSG_RESULT([defining bindir to be $bindir])
AC_MSG_RESULT([defining datadir to be $datadir])
AC_MSG_RESULT([defining libdir to be $libdir])
AC_MSG_RESULT([defining libexecdir to be $libexecdir])
AC_MSG_RESULT([defining includedir to be $includedir])
AC_MSG_RESULT([defining mandir to be $mandir])
AC_MSG_RESULT([defining infodir to be $infodir])
AC_MSG_RESULT([defining fcnfiledir to be $fcnfiledir])
AC_MSG_RESULT([defining localfcnfiledir to be $localfcnfiledir])
AC_MSG_RESULT([defining localfcnfilepath to be $localfcnfilepath])
AC_MSG_RESULT([defining archlibdir to be $archlibdir])
AC_MSG_RESULT([defining octfiledir to be $octfiledir])
AC_MSG_RESULT([defining localoctfiledir to be $localoctfiledir])
AC_MSG_RESULT([defining localoctfilepath to be $localoctfilepath])
AC_MSG_RESULT([defining fcnfilepath to be $fcnfilepath])
AC_MSG_RESULT([defining imagedir to be $imagedir])
AC_MSG_RESULT([defining imagepath to be $imagepath])

AC_SUBST(exec_prefix)
AC_SUBST(bindir)
AC_SUBST(datadir)
AC_SUBST(libdir)
AC_SUBST(libexecdir)
AC_SUBST(includedir)
AC_SUBST(mandir)
AC_SUBST(infodir)
AC_SUBST(fcnfiledir)
AC_SUBST(localfcnfiledir)
AC_SUBST(localfcnfilepath)
AC_SUBST(archlibdir)
AC_SUBST(octfiledir)
AC_SUBST(localoctfiledir)
AC_SUBST(localoctfilepath)
AC_SUBST(fcnfilepath)
AC_SUBST(imagedir)
AC_SUBST(imagepath)

### Path separator.

AC_DEFINE(SEPCHAR, [':'])
AC_DEFINE(SEPCHAR_STR, [":"])

### Allow the user to force us to use f2c.

AC_ARG_WITH(f2c,
  [  --with-f2c              use f2c even if Fortran compiler is available],
  [if test $withval = no; then use_f2c=false; else use_f2c=true; fi],
  use_f2c=false)

### Allow the user to force us to use g77.

AC_ARG_WITH(g77,
  [  --with-g77              use g77 to compile Fortran subroutines],
  [if test $withval = no; then use_g77=false; else use_g77=true; fi],
  use_g77=false)

if $use_f2c && $use_g77; then
  AC_MSG_WARN([--with-f2c and --with-g77 both specified!  Using g77...])
  use_f2c=false
fi

### Allow the user disable support for GNU info.

INFO_DIR=info
USE_GNU_INFO=true
LIBINFO=../info/libinfo.a
AC_ARG_ENABLE(info,
  [  --enable-info           use GNU info (default is yes)],
  [if test $enableval = no; then
     USE_GNU_INFO=false;
     LIBINFO="";
     INFO_DIR="";
   fi], [])
if $USE_GNU_INFO; then
  AC_DEFINE(USE_GNU_INFO, 1)
fi
AC_SUBST(LIBINFO)
AC_SUBST(INFO_DIR)

### Allow the user disable support for plplot.

# USE_PLPLOT=true
# PLPLOT_DIR=plplot
# LIBPLPLOT=../plplot/libplplot.a
USE_PLPLOT=false
PLPLOT_DIR=""
LIBPLPLOT=""
AC_ARG_ENABLE(plplot,
  [  --enable-plplot         use plplot for plotting (default is yes)],
  [if test $enableval = no; then
     USE_PLPLOT=false;
     LIBPLPLOT="";
     PLPLOT_DIR="";
   fi], [])
if $USE_PLPLOT; then
  AC_DEFINE(USE_PLPLOT, 1)
fi
AC_SUBST(LIBPLPLOT)
AC_SUBST(PLPLOT_DIR)

### Allow the user disable support for command line editing using GNU
### readline.

READLINE_DIR=readline
USE_READLINE=true
LIBREADLINE=-lreadline
AC_ARG_ENABLE(readline,
  [  --enable-readline       use readline library (default is yes)],
  [if test "$enableval" = no; then
     USE_READLINE=false;
     LIBREADLINE="";
     READLINE_DIR="";
   fi], [])
if $USE_READLINE; then
  AC_DEFINE(USE_READLINE, 1)
fi
AC_SUBST(LIBREADLINE)
AC_SUBST(READLINE_DIR)

### See which C++ compiler to use (we expect to find g++).

EXTERN_CXXFLAGS="$CXXFLAGS"

AC_PROG_CXX
AC_PROG_CXXCPP

### Do special things for g++.

ADD_CXX_WALL=false
NO_IMPLICIT_TEMPLATES=
gxx_version=`$CXX -v 2>&1 | grep "^.*g.. version" | sed 's/^.*g.. version *//'`
case "$gxx_version" in
changequote(,)dnl
  2.[6789].*|2.[123456789][0123456789].*)
changequote([,])dnl
    if test -z "$EXTERN_CXXFLAGS"; then
      ADD_CXX_WALL=true
    fi
    NO_IMPLICIT_TEMPLATES="-fno-implicit-templates"
    AC_MSG_RESULT([defining NO_IMPLICIT_TEMPLATES to be $NO_IMPLICIT_TEMPLATES])
  ;;
changequote(,)dnl
  1.*|2.[012345].*)
changequote([,])dnl
    AC_MSG_ERROR([g++ version $gxx_version will not work to compile Octave])
  ;;
  *)
    AC_MSG_WARN([Octave has only been tested with g++, and I can't find it])
  ;;
esac

HOST_CXXFLAGS=
case "$gxx_version" in
  2.6.*)
    case "$canonical_host_type" in
      rs6000-ibm-aix* | powerpc-ibm-aix*)
        HOST_CXXFLAGS="-Wa,-u"
        AC_MSG_RESULT([defining HOST_CXXFLAGS to be $HOST_CXXFLAGS])
      ;;
    esac
  ;;
esac

CXX_VERSION=
if test -n "$gxx_version"; then
  CXX_VERSION="$gxx_version"
fi
AC_SUBST(CXX_VERSION)

AC_SUBST(HOST_CXXFLAGS)
AC_SUBST(NO_IMPLICIT_TEMPLATES)

### See which C compiler to use (we expect to find gcc).

EXTERN_CFLAGS="$CFLAGS"

AC_PROG_CC
AC_PROG_CPP
AC_PROG_GCC_TRADITIONAL

### Do special things for gcc.

ADD_CC_WALL=false
gcc_version=`$CC -v 2>&1 | grep "^.*gcc version" | sed 's/^.*gcc version *//'`
case "$gcc_version" in
  2.*)
    if test -z "$EXTERN_CFLAGS"; then
      ADD_CC_WALL=true
    fi
    if test -z "$LDFLAGS"; then
      LDFLAGS="-g"
      AC_MSG_RESULT([defining LDFLAGS to be $LDFLAGS])
    fi
  ;;
  1.*)
    AC_MSG_WARN([gcc version $gcc_version is likely to cause problems])
  ;;
  *)
    AC_MSG_WARN([Octave has only been tested with gcc, and I can't find it])
  ;;
esac

CC_VERSION=
if test -n "$gcc_version"; then
  CC_VERSION="$gcc_version"
fi
AC_SUBST(CC_VERSION)

### On Linux systems we need to compile with -mieee-fp to get full
### support for IEEE floating point.
###
### On Alpha/OSF systems, wee need -mieee-with-inexact, but that also
### requires gcc 2.8.x or later.

case "$canonical_host_type" in
changequote(,)dnl
  i[345]86-*-linux)
changequote([,])dnl
    GCC_IEEE_FP_FLAG="-mieee-fp"
    AC_MSG_RESULT([defining GCC_IEEE_FP_FLAG to be $GCC_IEEE_FP_FLAG])
  ;;
  alpha-dec-osf*)
    case "$gcc_version" in
changequote(,)dnl
      1.* | 2.[01234567].*)
changequote([,])dnl
      ;;
      *)
        GCC_IEEE_FP_FLAG="-mieee-with-inexact"
        AC_MSG_RESULT([defining GCC_IEEE_FP_FLAG to be $GCC_IEEE_FP_FLAG])
      ;;
    esac
  ;;
esac
AC_SUBST(GCC_IEEE_FP_FLAG)

### Use -static if compiling on Alpha OSF/1 1.3 systems.

case "$canonical_host_type" in
  alpha-dec-osf1.3)
    LD_STATIC_FLAG=-static
  ;;
esac
if test -n "$LD_STATIC_FLAG"; then
  AC_MSG_RESULT([defining LD_STATIC_FLAG to be $LD_STATIC_FLAG])
fi
AC_SUBST(LD_STATIC_FLAG)

### Handle dynamic linking and shared library options.

### Allow the user to experiment with dynamic linking using dlopen/dlsym.

AC_ARG_ENABLE(dl,
  [  --enable-dl             use dlopen/dlsym for dynamic linking (not all systems)],
  [if test $enableval = no; then WITH_DL=no;
   elif test $enableval = yes; then WITH_DL=yes;
   else WITH_DL=maybe; fi],
  WITH_DL=maybe)

### Allow the user to experiment with dynamic linking using
### shl_load/shl_findsym (HP/UX only?).

AC_ARG_ENABLE(shl,
  [  --enable-shl            use shl_load/shl_findsym for dynamic linking (HP only?)],
  [if test $enableval = no; then WITH_SHL=no;
   elif test $enableval = yes; then WITH_SHL=yes;
   else WITH_SHL=maybe; fi],
  WITH_SHL=maybe)

### Enable creation of shared libraries.  Currently only works with
### gcc on some systems.

AC_ARG_ENABLE(shared,
  [  --enable-shared         create shared libraries (not all systems)],
  [if test $enableval = no; then SHARED_LIBS=false; else SHARED_LIBS=true; fi],
  SHARED_LIBS=false)
AC_SUBST(SHARED_LIBS)

DLFCN_DIR=
if $SHARED_LIBS; then
  CPICFLAG=-fPIC
  CXXPICFLAG=-fPIC
  FPICFLAG=-fPIC
  SHLEXT=so
  RLD_FLAG=
  case "$canonical_host_type" in
    alpha-dec-osf*)
      CPICFLAG=
      CXXPICFLAG=
      FPICFLAG=
      RLD_FLAG='-Xlinker -rpath -Xlinker $(libdir)'
    ;;
    rs6000-ibm-aix* | powerpc-ibm-aix*)
      CPICFLAG=
      CXXPICFLAG=
      FPICFLAG=
      DLFCN_DIR=dlfcn
    ;;
    hppa*-hp-hpux*)
      FPICFLAG=+Z
      SHLEXT=sl
      RLD_FLAG='-Xlinker +b -Xlinker $(libdir)'
    ;;
    *-sgi-*)
      FPICFLAG=-KPIC
    ;;
    sparc-sun-sunos4*)
      FPICFLAG=-PIC
      RLD_FLAG='-L $(libdir)'
    ;;
    sparc-sun-sunos5*)
      FPICFLAG=-PIC
      RLD_FLAG='-Xlinker -R -Xlinker $(libdir)'
    ;;
  esac
else
  FPICFLAG=
  CPICFLAG=
  CXXPICFLAG=
  SHLEXT=
  RLD_FLAG=
fi
AC_MSG_RESULT([defining FPICFLAG to be $FPICFLAG])
AC_MSG_RESULT([defining CPICFLAG to be $CPICFLAG])
AC_MSG_RESULT([defining CXXPICFLAG to be $CXXPICFLAG])
AC_MSG_RESULT([defining SHLEXT to be $SHLEXT])
AC_MSG_RESULT([defining DLFCN_DIR to be $DLFCN_DIR])
AC_SUBST(FPICFLAG)
AC_SUBST(CPICFLAG)
AC_SUBST(CXXPICFLAG)
AC_SUBST(SHLEXT)
AC_SUBST(RLD_FLAG)
AC_SUBST(DLFCN_DIR)

### Allow compilation of smaller kernel.  This only works if some form
### of dynamic linking is also supported and used.

AC_ARG_ENABLE(lite-kernel,
  [  --enable-lite-kernel    compile smaller kernel (requires dynamic linking)],
  [if test $enableval = no; then OCTAVE_LITE=false; else OCTAVE_LITE=true; fi],
  OCTAVE_LITE=false)
if $OCTAVE_LITE; then
  AC_DEFINE(OCTAVE_LITE, 1)
fi
AC_SUBST(OCTAVE_LITE)

### special checks for odd OS specific things.

AC_ISC_POSIX
AC_MINIX
AC_AIX
AC_CHECK_LIB(sun, getpwnam)

### How big are ints and how are they oriented?  These could probably
### be eliminated in favor of run-time checks.

AC_CHECK_SIZEOF(short)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)

### Does the C compiler handle alloca() and const correctly?

AC_ALLOCA
AC_C_CONST

### Get the list of libraries that the C++ compiler normally uses.

OCTAVE_CXXLIBS

### If we haven't been forced to use f2c, try to find a Fortran compiler
### under any one of several common Un*x Fortran compiler names. 
### Put fc last to avoid confusion with some vendor's /bin/sh fc
### builtin.
###
###    xlf : IBM / AIX
###   cf77 : Cray / Unicos
###    g77 : GNU Fortran (someday...)
###     fc : Convex
###
### I don't think the Cray compiler will ever work like f2c...
###
### The optional arguments to --with-g77 or --with-f2c force g77 or
### f2c to be used.  The optional argument to can be used to set the
### name of g77 or f2c.  For example `--with-g77=/opt/gnu/bin/f77'
### says that we are using g77 but it is installed as
### /opt/gnu/bin/f77.
###
### If neither of those options are specified, look for a Fortran
### compiler.  If one is found, see if it is compatible with our
### assumptions.  If it is, use it.  Otherwise, look for f2c.
###
### Issue a warning if we can't find a compatible fortran compiler or
### f2c.

if $use_g77; then
  if test "$with_g77" = "yes"; then
    F77=g77
  else
    F77="$with_g77"
  fi
  AC_MSG_RESULT([defining F77 to be $F77])
elif $use_f2c; then
  F77=
  if test "$with_f2c" = "yes"; then
    F2C=f2c
  else
    F2C="$with_f2c"
  fi
  AC_MSG_RESULT([defining F2C to be $F2C])
else
  AC_CHECK_PROGS(F77, xlf cf77 f77 g77 fc)
fi

FUGLY=
have_fortran_compiler=false
have_f2c=false

if $use_g77; then
  FUGLY=-fugly
  AC_MSG_RESULT([defining FUGLY to be $FUGLY])
  OCTAVE_FLIBS
  AC_DEFINE(F77_APPEND_UNDERSCORE, 1)
  AC_MSG_RESULT([defining F77_APPEND_UNDERSCORE to be 1])
  have_fortran_compiler=true
elif $use_f2c; then
  have_f2c=true
else
  if test -n "$F77"; then
    OCTAVE_FLIBS
    OCTAVE_F77_APPEND_UNDERSCORE
    OCTAVE_F2C_F77_COMPAT
    if test "$octave_cv_f2c_f77_compat" = no; then
      F77=
    else
      if test -z "$FFLAGS"; then
        FFLAGS="-O"
      fi
      case "$canonical_host_type" in
        alpha-dec-osf*)
          FFLAGS="-fpe1 $FFLAGS"
        ;;
      esac
      if test -n "$FFLAGS"; then
        AC_MSG_RESULT([defining FFLAGS to be $FFLAGS])
      fi
    fi
  fi
  if test -n "$F77"; then
    have_fortran_compiler=true
  else
    AC_CHECK_PROG(F2C, f2c, f2c, [])
    if test -n "$F2C"; then
      have_f2c=true
    fi
  fi
fi

f77_rules_frag=Makerules.f77
if $have_fortran_compiler; then
changequote(,)dnl
  cat << \EOF > $f77_rules_frag

%.c : %.f

%.o : %.f
	$(FC) -c $(ALL_FFLAGS) $<

pic/%.o : %.f
	$(FC) -c $(FPICFLAG) $(ALL_FFLAGS) $< -o $@

EOF
changequote([,])dnl
elif $have_f2c; then
  AC_DEFINE(F77_APPEND_UNDERSCORE, 1)
  AC_MSG_RESULT([defining F77_APPEND_UNDERSCORE to be 1])
  AC_CHECK_LIB(f2c, f_open, FLIBS=-lf2c, [], -lm)
  if test -z "$FLIBS"; then
    AC_CHECK_LIB(F77, d_sin, FLIBS=-lF77, [], -lm)
    if test -n "$FLIBS"; then
      AC_CHECK_LIB(I77, f_rew, FLIBS="$FLIBS -lI77", [], -lF77)
    fi
  fi
  if test -z "$FLIBS"; then
    AC_MSG_WARN([I found f2c but not libf2c.a, or libF77.a and libI77.a])
  fi
  f77_rules_frag=Makerules.f77
  cat << \EOF > $f77_rules_frag

%.c : %.f
	cat $< | $(F2C) $(F2CFLAGS) > $(@F)

%.o : %.f

EOF
else
  AC_MSG_WARN([in order to build octave, you must have a compatible])
  AC_MSG_WARN([Fortran compiler or f2c installed and in your path.])
  AC_MSG_ERROR([See the file INSTALL for more information.])
fi

FC=$F77
AC_SUBST(FC)
AC_SUBST(F77)
AC_SUBST(FFLAGS)
AC_SUBST(FUGLY)
AC_SUBST(FLIBS)
AC_SUBST(F2C)
AC_SUBST(F2CFLAGS)
AC_SUBST_FILE(f77_rules_frag)

### Extract libraries and directories from FLIBS and CXXLIBS.
###
### Leave only libraries, with -lfoo converted to libfoo.a:

changequote(,)dnl
FLIB_LIST=`echo " $FLIBS " | sed -e 's/ -Xlinker *[^ ]*/ /g' \
	-e 's/ -[LR] *[^ ]*/ /g' \
	-e 's/ -l *\([^ ]*\)/ lib\1.a/g' -e 's/ -u *[^ ]*/ /g' \
	-e 's/ [^ ]*\.o//g' \
	-e 's/^ *//' -e 's/ *$//' -e 's/  */:/g'`

CXXLIB_LIST=`echo " $CXXLIBS " | sed -e 's/ -Xlinker *[^ ]*/ /g' \
	-e 's/ -[LR] *[^ ]*/ /g' \
	-e 's/ -l *\([^ ]*\)/ lib\1.a/g' -e 's/ -u *[^ ]*/ /g' \
	-e 's/ [^ ]*\.o//g' \
	-e 's/^ *//' -e 's/ *$//' -e 's/  */:/g'`

### Leave only directories where libraries might be found:

FLIB_PATH=`echo " $FLIBS " | sed \
	-e 's/ /  /g' -e 's/ -Xlinker *[^ ]*/ /g' \
	-e 's/ -[LR] *\([^ ]*\)/ \1/g' -e 's, /[^ ]*\.a , ,g' \
	-e 's/ -l *[^ ]*/ /g' -e 's/ -u *[^ ]*/ /g' \
	-e 's/ [^ ]*\.o//g' \
	-e 's/^ *//' -e 's/ *$//' -e 's/  */:/g'`

CXXLIB_PATH=`echo " $CXXLIBS " | sed -e 's/ -Xlinker *[^ ]*/ /g' \
	-e 's/ -[LR] *\([^ ]*\)/ \1/g' -e 's, /[^ ]*\.a , ,g' \
	-e 's/ /  /g' -e 's/ -Xlinker *[^ ]*/ /g' \
	-e 's/ -l *[^ ]*/ /g' -e 's/ -u *[^ ]*/ /g' \
	-e 's/ [^ ]*\.o//g' \
	-e 's/^ *//' -e 's/ *$//' -e 's/  */:/g'`
changequote([,])dnl

AC_MSG_RESULT([defining FLIB_LIST to be $FLIB_LIST])
AC_MSG_RESULT([defining FLIB_PATH to be $FLIB_PATH])

AC_MSG_RESULT([defining CXXLIB_LIST to be $CXXLIB_LIST])
AC_MSG_RESULT([defining CXXLIB_PATH to be $CXXLIB_PATH])

AC_SUBST(FLIB_LIST)
AC_SUBST(FLIB_PATH)

AC_SUBST(CXXLIB_LIST)
AC_SUBST(CXXLIB_PATH)

### Checks for header files.

AC_HEADER_STDC
AC_HEADER_DIRENT
AC_HEADER_TIME
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS(assert.h float.h floatingpoint.h limits.h memory.h)
AC_CHECK_HEADERS(pwd.h stdlib.h string.h unistd.h varargs.h)
AC_CHECK_HEADERS(sys/fcntl.h sys/param.h sys/resource.h sys/select.h)
AC_CHECK_HEADERS(sys/stat.h sys/time.h sys/times.h sys/utsname.h)
AC_CHECK_HEADERS(termios.h termio.h sgtty.h)
AC_CHECK_HEADERS(termcap.h curses.h)

if test "$ac_cv_header_termios_h" = yes \
    || test "$ac_cv_header_termio_h" = yes \
    || test "$ac_cv_header_sgtty_h" = yes; then
  true
else
  AC_MSG_ERROR([I couldn't find termios.h, termio.h, or sgtty.h!])
fi

### See if the optional nonlinear programming code is present.

AC_MSG_CHECKING([for npsol])
if test -f $srcdir/libcruft/npsol/npsol.f; then
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
  AC_DEFINE(NPSOL_MISSING, 1)
fi

AC_MSG_CHECKING([for qpsol])
if test -f $srcdir/libcruft/qpsol/qpsol.f; then
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
  AC_DEFINE(QPSOL_MISSING, 1)
fi

AC_MSG_CHECKING([for fsqp])
if test -f $srcdir/libcruft/fsqp/fsqpd.f; then
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
  AC_DEFINE(FSQP_MISSING, 1)
fi

### Checks for functions and variables.

AC_CHECK_FUNCS(setvbuf getcwd gethostname bzero bcopy rindex vfprintf vsprintf)
AC_CHECK_FUNCS(stricmp strnicmp strcasecmp strncasecmp strerror atexit)
AC_CHECK_FUNCS(on_exit tempnam memmove putenv strdup)
AC_CHECK_FUNCS(mkdir rmdir rename umask)
AC_CHECK_FUNCS(sigaction sigprocmask sigpending sigsuspend)

OCTAVE_SMART_PUTENV
OCTAVE_PROGRAM_INVOCATION_NAME

LIBDLFCN=
DLFCN_INCFLAGS=
if test "$WITH_DL" = yes || test "$WITH_DL" = maybe; then
  case "$canonical_host_type" in
    rs6000-ibm-aix* | powerpc-ibm-aix*)
      LIBDLFCN=-ldlfcn
      DLFCN_INCFLAGS='-I$(top_srcdir)/dlfcn -I$(TOPDIR)/dlfcn'
      WITH_DL=true
    ;;
    *)
      AC_CHECK_LIB(dl, dlopen)
      AC_CHECK_FUNCS(dlopen dlsym dlerror dlclose)
      if test "$ac_cv_func_dlopen" = yes \
	 && test "$ac_cv_func_dlsym" = yes \
	 && test "$ac_cv_func_dlerror" = yes \
	 && test "$ac_cv_func_dlclose" = yes; then
	WITH_DL=true
      else
	if test "$WITH_DL" = yes; then
	  AC_MSG_ERROR([--enable-dl specified, but functions are missing!])
	fi
	WITH_DL=false
      fi
    ;;
  esac
  if $WITH_DL; then
    AC_DEFINE(WITH_DL, 1)
  fi
else
  WITH_DL=false
fi
AC_SUBST(WITH_DL)
AC_SUBST(LIBDLFCN)
AC_SUBST(DLFCN_INCFLAGS)

if test "$WITH_SHL" = yes || test "$WITH_SHL" = maybe; then
  AC_CHECK_LIB(dld, shl_load)
  AC_CHECK_FUNCS(shl_load shl_findsym)
  if test "$ac_cv_func_shl_load" = yes \
     && test "$ac_cv_func_shl_findsym" = yes; then
    WITH_SHL=true
  else
    if test "$WITH_SHL" = yes; then
      AC_MSG_ERROR([--enable-shl specified, but functions are missing!])
    fi
    WITH_SHL=false
  fi
  if $WITH_SHL; then
    AC_DEFINE(WITH_SHL, 1)
  fi
else
  WITH_SHL=false
fi
AC_SUBST(WITH_SHL)

### Set WITH_DYNAMIC_LINKING after all the other shared library stuff
### has been determined.

if $WITH_DL || $WITH_SHL; then
  AC_DEFINE(WITH_DYNAMIC_LINKING, 1)
  WITH_DYNAMIC_LINKING=true
else
  WITH_DYNAMIC_LINKING=false
fi
AC_SUBST(WITH_DYNAMIC_LINKING)

### There is more than one possible prototype for gettimeofday.  See
### which one (if any) appears in sys/time.h.

AC_CHECK_FUNC(gettimeofday,
  AC_TRY_COMPILE([#include <sys/time.h>],
  [gettimeofday ((struct timeval *) 0,(struct timezone *) 0);],
  [], AC_DEFINE(GETTIMEOFDAY_NO_TZ)))

dnl Would like to get rid of this cruft, and just have
dnl
dnl   AC_CHECK_FUNCS(finite isnan isinf)
dnl
dnl instead, but that used to fail on some systems...
dnl
dnl Also just using AC_CHECK_FUNCS doesn't seem to work to find isinf
dnl and isnan on Linux systems, so we use AC_CHECK_FUNC, and if that
dnl fails, we try again by including math.h and invoking the function
dnl with an argument. 

### Check to see if we have IEEE math functions, and if so, which ones.
###
### For Linux: add -mieee-fp flag to CFLAGS when checking for IEEE FP
### functions, otherwise we may not find them.
###
### Also check for some additional trig functions that aren't ANSI but
### are often available.  If they are missing, we try to replace them
### with functions from the BSD/NET2 math library.

AC_CHECK_LIB(sunmath, quiet_nan, , , -lm)

dnl This is bogus.  We shouldn't have to explicitly add libc too!

case "$canonical_host_type" in
  *-*-linux*)
    AC_CHECK_LIB(m, sin, , , -lc)
  ;;
  *)
    AC_CHECK_LIB(m, sin)
  ;;
esac

XCFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $GCC_IEEE_FP_FLAG"

### I am told that Inf and NaN don't work on m68k HP sytems.

case "$canonical_host_type" in
  m68k-hp-hpux*)
  ;;
  *)
    AC_CHECK_FUNCS(finite isnan isinf infinity quiet_nan)
  ;;
esac

### Check for nonstandard but common math functions that we need.

AC_CHECK_FUNCS(acosh asinh atanh erf erfc)

CFLAGS="$XCFLAGS"

### Checks for OS specific cruft.

AC_STRUCT_ST_BLKSIZE
AC_STRUCT_ST_BLOCKS
AC_STRUCT_ST_RDEV
AC_STRUCT_TM
AC_STRUCT_TIMEZONE
AC_FUNC_SETVBUF_REVERSED
AC_FUNC_CLOSEDIR_VOID

TERMLIBS=""
for termlib in termcap terminfo curses termlib; do
  AC_CHECK_LIB(${termlib}, tputs, [TERMLIBS="${TERMLIBS} -l${termlib}"])
  case "${TERMLIBS}" in
    *-l${termlib}*)
      AC_MSG_RESULT([defining TERMLIBS to be $TERMLIBS])
      break
    ;;
  esac
done
AC_SUBST(TERMLIBS)

AC_MSG_CHECKING([for struct exception in math.h])
AC_TRY_LINK([#include <math.h>],
  [struct exception *x; x->type; x->name;],
  AC_MSG_RESULT(yes)
  AC_DEFINE(EXCEPTION_IN_MATH, 1),
  AC_MSG_RESULT(no))

### Signal stuff.

AC_TYPE_SIGNAL
AC_DECL_SYS_SIGLIST
AC_MSG_CHECKING([for sys_siglist variable])
AC_TRY_LINK([#include <stdio.h>],
  [extern char *sys_siglist[]; printf ("%s\n", sys_siglist[1]);],
  AC_MSG_RESULT(yes)
  AC_DEFINE(HAVE_SYS_SIGLIST, 1),
  AC_MSG_RESULT(no))

### Type stuff.

AC_TYPE_MODE_T
AC_TYPE_OFF_T
AC_TYPE_SIZE_T
AC_TYPE_UID_T
AC_CHECK_TYPE(dev_t, short)
AC_CHECK_TYPE(ino_t, unsigned long)
AC_CHECK_TYPE(nlink_t, short)

### Define VOID_SIGHANDLER for readline.

case "$RETSIGTYPE" in
  int)
  ;;
  *)
    VOID_SIGHANDLER="-DVOID_SIGHANDLER=1"
    AC_MSG_RESULT([defining VOID_SIGHANDLER to be 1])
  ;;
esac
AC_SUBST(VOID_SIGHANDLER)

### Try to make it possible to find getrusage on Solaris systems.

case "$canonical_host_type" in
  *-*-solaris2*)
    UCBLIB=/usr/ucblib/libucb.a
    if test -f $UCBLIB; then
      LIBS="-lc $UCBLIB $LIBS"
      AC_MSG_RESULT([adding $UCBLIB to LIBS])
    fi
  ;;
esac

AC_CHECK_FUNCS(getrusage times)

### Checks for other programs used for building, testing, installing,
### and running Octave.
###
### For now, don't define LEXLIB to be -lfl -- we don't use anything in
### it, and it might not be installed.
###
### Also make sure that we generate an interactive scanner if we are
### using flex.

AC_PROG_LEX
case "$LEX" in
  flex*)
    LFLAGS="-t -I"
    AC_MSG_RESULT([defining LFLAGS to be $LFLAGS])
    LEXLIB=
  ;;
  *)
    LFLAGS="-t"
    AC_MSG_RESULT([defining LFLAGS to be $LFLAGS])
    AC_MSG_WARN([I didn't find flex, but that's only a problem])
    AC_MSG_WARN([if you need to reconstruct lex.cc])
  ;;
esac
AC_SUBST(LFLAGS)

AC_PROG_YACC
case "$YACC" in
  bison*)
  ;;
  *)
    AC_MSG_WARN([I didn't find bison, but that's only a problem])
    AC_MSG_WARN([if you need to reconstruct parse.cc])
  ;;
esac

if test -z "$AR"; then
  AR=ar
fi
AC_SUBST(AR)

if test -z "$ARFLAGS"; then
  ARFLAGS="rc"
fi
AC_SUBST(ARFLAGS)

AC_PROG_RANLIB

AC_PROG_LN_S

AC_CHECK_PROG(RUNTEST, runtest, runtest, [])
AC_CHECK_PROG(EXPECT, expect, expect, [])
if test -z "$EXPECT"; then
  RUNTEST=
fi
AC_SUBST(RUNTEST)

AC_PROG_INSTALL

AC_CHECK_PROG(GNUPLOT_BINARY, gnuplot, gnuplot, [])
if test -n "$GNUPLOT_BINARY"; then
  AC_MSG_CHECKING([to see if your gnuplot supports multiplot])
  if test -z "`echo 'set term unknown; set multiplot' | \
    $GNUPLOT_BINARY 2>&1`"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE(GNUPLOT_HAS_MULTIPLOT, 1)
  else
    AC_MSG_RESULT([no])
  fi
else
  AC_MSG_WARN([I didn't find gnuplot.  It isn't necessary to have gnuplot])
  AC_MSG_WARN([installed, but you won't be able to use any of Octave's])
  AC_MSG_WARN([plotting commands without it.])
  AC_MSG_WARN([])
  AC_MSG_WARN([If gnuplot is installed but it isn't in your path, you can])
  AC_MSG_WARN([tell Octave where to find it by typing the command])
  AC_MSG_WARN([])
  AC_MSG_WARN([gnuplot_binary = "/full/path/to/gnuplot/binary"])
  AC_MSG_WARN([])
  AC_MSG_WARN([at the Octave prompt.])
fi

AC_CHECK_PROGS(DEFAULT_PAGER, less more page pg, [])
if test -z "$DEFAULT_PAGER"; then
  AC_MSG_WARN([I couldn't find `less', `more', `page', or `pg'])
elif test "$DEFAULT_PAGER" = less; then
  DEFAULT_PAGER="less -e"
  AC_MSG_RESULT([defining DEFAULT_PAGER to be $DEFAULT_PAGER])
fi

### Even though we include config.h, we need to have the preprocessor
### defines available in a variable for the octave-bug script.  Use
### UGLY_DEFS for that.

AC_OUTPUT_MAKE_DEFS
UGLY_DEFS="$DEFS"
AC_MSG_RESULT([defining UGLY_DEFS to be $UGLY_DEFS])
AC_SUBST(UGLY_DEFS)

### Maybe add -Wall to compiler flags now that we're done feature
### testing. 
###
### To get gcc and g++ to be really picky, try these adding these
### options to CFLAGS and CXXFLAGS along with -Wall:
###
###   -ansi
###   -pedantic
###   -Wwrite-strings
###   -Wid-clash-31
###   -Wpointer-arith
###   -Wcast-qual
###   -Wenum-clash
###   -Wcast-align
###   -Wtraditional
###   -Wstrict-prototypes
###   -Wmissing-prototypes
###   -Wnested-externs
###   -Woverloaded-virtual
###   -Winline
###   -felide-constructors
###   -fnonnull-objects

if $ADD_CXX_WALL; then
  CXXFLAGS="$CXXFLAGS -Wall"
  AC_MSG_RESULT([adding -Wall to CXXFLAGS])
fi
if $ADD_CC_WALL; then
  CFLAGS="$CFLAGS -Wall"
  AC_MSG_RESULT([adding -Wall to CFLAGS])
fi

### Run configure in subdirectories.

export CC
export CXX
export F77

AC_CONFIG_SUBDIRS(glob kpathsea scripts $INFO_DIR $PLPLOT_DIR $READLINE_DIR)

### Do the substitutions in all the Makefiles.

AC_OUTPUT(Makefile octMakefile Makeconf test/Makefile dlfcn/Makefile
	  doc/Makefile doc/faq/Makefile doc/interpreter/Makefile
	  doc/liboctave/Makefile doc/refcard/Makefile
	  liboctave/Makefile src/Makefile src/mk-oct-links
	  libcruft/Makefile libcruft/Makerules libcruft/blas/Makefile
	  libcruft/balgen/Makefile libcruft/dassl/Makefile
	  libcruft/eispack/Makefile libcruft/fftpack/Makefile
	  libcruft/fsqp/Makefile libcruft/lapack/Makefile
	  libcruft/linpack/Makefile libcruft/minpack/Makefile
	  libcruft/misc/Makefile libcruft/npsol/Makefile
	  libcruft/odepack/Makefile libcruft/qpsol/Makefile
	  libcruft/quadpack/Makefile libcruft/ranlib/Makefile
	  libcruft/slatec-fn/Makefile libcruft/villad/Makefile)

### Print a summary so that important information isn't missed.

CXX_EXTRAS="$HOST_CXXFLAGS $NO_IMPLICIT_TEMPLATES $GCC_IEEE_FP_FLAG"

if test -z "$F77"; then
  FORT="$F2C $F2CFLAGS"
else
  FORT="$F77 $FFLAGS $FUGLY"
fi

AC_MSG_RESULT([

Octave is now configured for $canonical_host_type

  Source directory:     $srcdir
  Installation prefix:  $prefix
  C compiler:           $CC $GCC_IEEE_FP_FLAG $CFLAGS
  C++ compiler:         $CXX $CXX_EXTRAS $CXXFLAGS
  Fortran compiler:     $FORT
  Fortran libraries:    $FLIBS
  Use GNU readline:     $USE_READLINE
  Use GNU info reader:  $USE_GNU_INFO
  Default pager:        $DEFAULT_PAGER
  gnuplot:              $GNUPLOT_BINARY

  Build shared libraries:                  $SHARED_LIBS
  Minimal kernel option:                   $OCTAVE_LITE
  Dynamic Linking (dlopen/dlsym):          $WITH_DL
  Dynamic Linking (shl_load/shl_findsym):  $WITH_SHL
])