#!/bin/sh
# Configuration script for GNU Emacs
#   Copyright (C) 1992 Free Software Foundation, Inc.

#This file is part of GNU Emacs.

#GNU Emacs 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 1, or (at your option)
#any later version.

#GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
#the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

# Shell script to edit files and make symlinks in preparation for
# compiling Emacs.
# 
# Usage: configure machine
#
# If configure succeeds, it leaves its status in config.status.
# If configure fails after disturbing the status quo, 
# 	config.status is removed.
#

progname=$0

short_usage="Type \`${progname} -usage' for more information about options."

usage_message="Usage: ${progname} MACHINENAME [-OPTION[=VALUE] ...]
Set compilation and installation parameters for GNU Emacs, and report.
MACHINENAME is the machine to build for.  See \`etc/MACHINES'.
Options are:
  -opsystem=SYSTEM - operating system to build for; see \`etc/MACHINES'.
  -libroot=DIR - where to install Emacs's library files
These options have reasonable defaults (in []s), and may not be needed:
  -g, -O - Passed to the compiler.  If omitted, use -O only.
  -cc=COMPILER - Which compiler to use.  Defaults to gcc if available.
  -libdir=DIR - where to look for arch-dependent library files
  -datadir=DIR - where to look for architecture-independent library files
  -installbin=DIR - where to install the Emacs executable, and some friends
  -lisppath=PATH - colon-separated list of Elisp directories
  -lockdir=DIR - where Emacs should do its file-locking stuff
  -window_system=none or [x11, if it is installed] - what window system to use
  -have_x_menu=yes or [no] - include menu support under X11
  -gnu_malloc=[yes] or no - use the GNU memory allocator
  -rel_alloc=[yes] or no - use compacting allocator for buffers
  -highpri=N - run at N points higher-than-normal priority
  -lisp_float_type=[yes] or no - Support floating point in Elisp
If successful, ${progname} leaves its status in config.status.  If
unsuccessful after disturbing the status quo, config.status is removed."

if [ ! -r ./src/lisp.h ]; then
  echo "${progname}: Can't find Emacs sources in \`./src'.
Run this config script in the top directory of the Emacs source tree." 1>&2
  exit 1
fi

options=":\
usage:help:\
machine:opsystem:\
g:O:cc:\
libroot:datadir:libdir:installbin:lisppath:lockdir:\
gnu_malloc:rel_alloc:highpri:lisp_float_type:\
window_system:have_x_menu:\
"

boolean_opts=":\
g:O:\
gnu_malloc:rel_alloc:lisp_float_type:have_x_menu:\
"

config_h_opts=":\
highpri:gnu_malloc:rel_alloc:lisp_float_type:\
have_x_windows:have_x11:have_x_menu:\
c_switch_site:sigtype:\
"

libroot=
installbin=/usr/local/bin
gnu_malloc=yes
lisp_float_type=yes

# The default values for the following options are guessed at after other
# options have been checked and given values, so we set them to null here.
lisppath=""
datadir=""
libdir=""
lockdir=""
window_system=""
have_x_menu=""

# This must be the only option on the line, and it can't be abbreviated.
# This keeps it from interfering with the other, documented options.
if [ "$*" = "+distribute" ]; then
  libroot=/usr/local/lib/emacs
  machine=hp300bsd
  opsystem=bsd4-3
  shift
fi

echo "Examining options..."
for arg in $*; do
  case "${arg}" in
    -*)
      # Separate the switch name from the value it's being given.
      case "${arg}" in
        -*=* )
	  opt=`echo ${arg} | sed 's:^-\([^=]*\)=.*$:\1:'`
	  val=`echo ${arg} | sed 's:^-[^=]*=\(.*\)$:\1:'`
	  valomitted=no
	;;
        -* )
          # If FOO is a boolean argument, -FOO is equivalent to -FOO=yes.
	  opt=`echo ${arg} | sed 's:^-\(.*\)$:\1:'`
          val="yes"
          valomitted=yes
        ;;
      esac

      # Make sure the argument is valid and unambiguous.
      case ${options} in
        *:${opt}:* )	# Exact match.
          optvar=${opt}
        ;;
        *:${opt}*:${opt}*:* )	# Ambiguous prefix.
	  echo "\`-${opt}' is an ambiguous switch; it could be any of the following:"
	  echo `echo ${options} | tr ':' '\012' | grep '^'${opt}`
	  echo ${short_usage}
	  exit 1
	;;
        *:${opt}*:* )		# Unambigous prefix.
	  optvar=`echo ${options} | sed 's/^.*:\('${opt}'[^:]*\):.*$/\1/'`
        ;;
	* )
	  (echo "\`-${opt}' is not a valid option."
	   echo "${short_usage}") | more
	  exit 1
	;;
      esac

      case "${optvar}" in
        usage | help)
          echo "${usage_message}" | more
          exit 1
        ;;
      esac

      # If the variable is supposed to be boolean, make sure the value
      # given is either "yes" or "no".  If not, make sure some value
      # was given.
      case "${boolean_opts}" in
        *:${optvar}:* )
	  case "${val}" in
	    y | ye | yes )	val=yes ;;
	    n | no )		val=no  ;;
	    * )
	      echo "The \`-${optvar}' option (\`-${opt}') is supposed to have a boolean
  value - set it to either \`yes' or \`no'." 1>&2
	      exit 1
	    ;;
	  esac
        ;;
        *)
	  if [ "${valomitted}" = "yes" ]; then
	    (echo "${progname}: You must give a value for the \`-${opt}' option, as in
  \`-${opt}=FOO'."
	     echo "${short_usage}") | more
	    exit 1
	  fi
        ;;
      esac

      eval "${optvar}=\"${val}\""
    ;;
    *)
      machine=${arg}
    ;;
  esac
done

if [ "${machine}" = "" ]; then
  (echo "You must specify a machine name as an argument to ${progname}."
   echo "${short_usage}") | more
  exit 1
fi

echo "Checking machine..."
machfile="m/${machine}.h"
if [ ! -r src/${machfile} ]; then
  echo "${progname}: Emacs has no configuration info for the machine called
\`${machine}'.  Look at etc/MACHINES for the names of machines
that Emacs has been ported to." 1>&2
  exit 1
fi

echo "Checking operating system..."
if [ "${opsystem}" = "" ]; then

  echo "  No operating system explicitly specified."
  echo "  Guessing, based on machine..."
  # Get the default operating system to go with the specified machine.
  opsystem=`grep 'USUAL-OPSYS="' src/${machfile} \
	    | sed 's/^.*USUAL-OPSYS="\([^"]*\)".*$/\1/'`

  if [ "${opsystem}" = "" ]; then
    echo "${progname}: Emacs's configuration files don't suggest what operating
system a \`${machine}' machine might run.  Try specifying the
operating system explicitly by passing ${progname} an
\`-opsystem=SYSTEM-NAME' flag.  Look at etc/MACHINES for the
names of operating systems that Emacs has been ported to." 1>&2
    exit 1
  fi

  if [ "${opsystem}" = "note" ]; then
    echo "The \`${machine}' machine can be used with more than one operating
system, and Emacs's configuration info isn't clever enough to figure
out which one you're running.  Run ${progname} with -machine and
-opsystem arguments as specified below for the appropriate system.
(This information comes from the file \`etc/MACHINES' - see that
file for more detail.)

" 1>&2
    sed < src/${machfile} -e '1,/NOTE-START/d' -e '/NOTE-END/,$d' | more
    echo
    exit 1
  fi

  opsysfile="s/${opsystem}.h"
  if [ ! -r src/${opsysfile} ]; then
    echo "${progname}: Emacs's configuration files say that the default
operating system for the machine \`${machine}' is \`${opsystem}',
but there is no configuration file for \`${opsystem}', so Emacs's
default info is screwed up.  Try specifying the operating system
explicitly by passing ${progname} an \`-opsystem=SYSTEM-NAME' flag." 1>&2
    exit 1
  fi
else
  opsysfile="s/${opsystem}.h"
  if [ ! -r src/${opsysfile} ]; then
    echo "${progname}: Emacs has no configuration info for the operating system
\`${opsystem}'.  Look at etc/MACHINES for the names of operating
systems that Emacs has been ported to." 1>&2
    exit 1
  fi
fi

if [ "${libroot}" = "" ]; then
  echo "Guessing library directory..."
  libroot=`/bin/pwd`
fi

echo "Checking window system..."
window_system="`echo ${window_system} | tr A-Z a-z`"
case "${window_system}" in
  "none" | "x11" | "x10" ) ;;
  "x" ) window_system=x11 ;;
  "" )
    echo "  No window system specifed.  Looking for X Windows."    
    window_system=none
    if [ -r /usr/lib/libX11.a -a -d /usr/include/X11 ]; then
      window_system=x11
    fi        
  ;;
  * )
    echo "The \`-window_system' option must be set to \`none' or \`X11'." 1>&2
    exit 1
  ;;
esac

case "${window_system}" in
  x11 )
    have_x_windows=yes
    have_x11=yes
  ;;
  x10 )
    have_x_windows=yes
    have_x11=no
  ;;
  none )
    have_x_windows=no
    have_x11=no
  ;;
esac

# What is the return type of a signal handler?  We grep
# /usr/include/signal.h for the declaration of the signal function.
# Yuck.
echo "Looking for return type of signal handler functions..."
if [ -r /usr/include/signal.h ]; then
  sigpattern='[ 	]*([ 	]*\*[ 	]*signal[ 	]*('
  sigtype=void
  if grep -s "int${sigpattern}" /usr/include/signal.h; then
    sigtype=int
  fi
fi


# Do the opsystem or machine files prohibit the use of the GNU malloc?
echo "Checking to see if the GNU malloc routines are permissible..."
if (cd ./src;grep SYSTEM_MALLOC ${opsysfile} ${machfile} > /dev/null); then
  gnu_malloc=no
  gnu_malloc_reason="
  (The GNU allocators don't work with this machine and/or operating system.)"
fi

rel_alloc=${gnu_malloc}

if [ "${have_x_menu}" = "" ]; then
  have_x_menu=no
fi

if [ "${lisppath}" = "" ]; then
  lisppath=${libroot}/local-lisp:${libroot}/lisp
fi

if [ "${datadir}" = "" ]; then
  datadir=${libroot}/etc
fi

if [ "${libdir}" = "" ]; then
  libdir=${libroot}/arch-lib
fi

if [ "${lockdir}" = "" ]; then
  lockdir=${libroot}/lock
fi

echo "Checking for GCC..."
case "${cc}" in
  "" )
    temppath=`echo $PATH | sed 's/^:/.:/
				s/::/:.:/g
				s/:$/:./
				s/:/ /g'`
    cc=`(
      for dir in ${temppath}; do
        if [ -f ${dir}/gcc ]; then echo gcc; exit 0; fi
      done
      echo cc
    )`
  ;;
esac

case "${O},${g},${cc}" in
  ,,gcc ) O=yes; g=yes ;;
  ,,*   ) O=yes; g=no  ;;
esac

echo "Guessing which libraries the lib-src programs will want,"
echo "  based on the machine- and system-dependent files..."
echo '#include "src/'${machfile}'"
#include "src/'${opsysfile}'"
#ifndef LIBS_MACHINE
#define LIBS_MACHINE
#endif
#ifndef LIBS_SYSTEM
#define LIBS_SYSTEM
#endif
libsrc_libs=LIBS_MACHINE LIBS_SYSTEM
' > config-tmp-$$.c
eval `${cc} -E config-tmp-$$.c | grep 'libsrc_libs='`
rm config-tmp-$$.c

rm -f config.status
set -e

# Make the proper settings in the config file.
echo "Making src/config.h from src/config.h-dist"
if [ "${highpri}" != "" ]; then
  highpri="(-${highpri})"
fi
case "${g}" in
  "yes" ) c_switch_site="${c_switch_site} -g" ;;
esac
case "${O}" in
  "yes" ) c_switch_site="${c_switch_site} -O" ;;
esac
sed_flags="-e 's:@machine@:${machfile}:'"
sed_flags="${sed_flags} -e 's:@opsystem@:${opsysfile}:'"
for flag in `echo ${config_h_opts} | tr ':' ' '`; do
  cflagname=`echo ${flag} | tr a-z A-Z`
  val=`eval echo '$'${flag}`
  case ${val} in
    no | "")
      f="-e 's:.*#define ${cflagname}.*:/\\* #define ${cflagname} \\*/:'"
    ;;
    yes)
      f="-e 's:.*#define ${cflagname}.*:#define ${cflagname}:'"
    ;;
    *)
      f="-e 's:.*#define ${cflagname}.*:#define ${cflagname} ${val}:'"
    ;;
  esac
  sed_flags="${sed_flags} ${f}"
done
eval '/bin/sed '${sed_flags}' < src/config.h-dist > src/config.h'

# Modify the parameters in the top makefile.
echo "Editing ./Makefile..."
tempMakefile="tempMakefile"$$
/bin/sed < Makefile > ${tempMakefile}			\
-e 's;^\(LIBROOT=\).*$;\1'"${libroot};"			\
-e 's;^\(INSTALLBIN=\).*$;\1'"${installbin};"		\
-e 's;^\(LISPPATH=\).*$;\1'"${lisppath};"		\
-e 's;^\(DATADIR=\).*$;\1'"${datadir};"			\
-e 's;^\(LOCKDIR=\).*$;\1'"${lockdir};"			\
-e 's;^\(LIBDIR=\).*$;\1'"${libdir};"
mv ${tempMakefile} Makefile

# Modify the parameters in the `build-install' script.
echo "Editing ./build-install..."
tempbi="tempbi"$$
/bin/sed < build-install > ${tempbi}		\
-e 's;^\(LIBROOT=\).*$;\1'"${libroot};"		\
-e 's;^\(BINDIR=\).*$;\1'"${installbin};"	\
-e 's;^\(LISPPATH=\).*$;\1'"${lisppath};"	\
-e 's;^\(DATADIR=\).*$;\1'"${datadir};"		\
-e 's;^\(LOCKDIR=\).*$;\1'"${lockdir};"		\
-e 's;^\(LIBDIR=\).*$;\1'"${libdir};"
mv ${tempbi} build-install
chmod a+x build-install

# Modify the parameters in the src makefile.
echo "Editing src/Makefile..."
tempMakefile="tempMakefile"$$
/bin/sed < src/Makefile > ${tempMakefile}		\
-e 's;^\(CC[ ]*=\).*$;\1'"${cc};"
mv ${tempMakefile} src/Makefile

# Modify the parameters in the lib-src makefile.
echo "Editing lib-src/Makefile..."
tempMakefile="tempMakefile"$$
/bin/sed < lib-src/Makefile > ${tempMakefile}		\
-e 's;^\(CFLAGS=\).*$;\1'"${c_switch_site};"		\
-e 's;^\(LOADLIBES=\).*$;\1'"${libsrc_libs};"		\
-e 's;^\(CC=\).*$;\1'"${cc};"
mv ${tempMakefile} lib-src/Makefile

# Document the damage we have done.
echo
echo "Configured for machine \`${machine}' running \`${opsystem}'.
The following values have been set in ./Makefile and ./build-install:
  Executables will be placed in
	  ${installbin}.
  Emacs's lisp search path will be
	  \`${lisppath}'.
  Emacs will look for its architecture-independent data in
	  ${datadir}.
  Emacs will look for its utility programs and other architecture-
  dependent data in
	  ${libdir}.
  Emacs will keep track of file-locking in
	  ${lockdir}.
The following values have been set in src/config.h:
  At how much higher than normal priority should Emacs run? ${highpri-none}
  Should Emacs use the GNU version of malloc?		    ${gnu_malloc}${gnu_malloc_reason}
  Should Emacs use the relocating allocator for buffers?    ${rel_alloc}
  Should Emacs support a floating point Elisp type?	    ${lisp_float_type}
  What window system should Emacs use?			    ${window_system}
  Should Emacs support mouse menus, which require X11?	    ${have_x_menu}
  What compiler should emacs be built with?                 ${cc}
  Should the compilation use \`-g' and/or \`-O'?             ${c_switch_site- neither}" \
| tee config.status 1>&2

exit 0