ocaml/configure

#! /bin/sh

#########################################################################
#                                                                       #
#                                 OCaml                                 #
#                                                                       #
#            Xavier Leroy, projet Cristal, INRIA Rocquencourt           #
#                                                                       #
#   Copyright 1999 Institut National de Recherche en Informatique et    #
#   en Automatique.  All rights reserved.  This file is distributed     #
#   under the terms of the GNU Library General Public License, with     #
#   the special exception on linking described in file LICENSE.         #
#                                                                       #
#########################################################################

configure_options="$*"
prefix=/usr/local
bindir=''
libdir=''
mandir=''
manext=1
host_type=unknown
target_type=""
ccoption=''
asoption=''
asppoption=''
cclibs=''
curseslibs=''
mathlib='-lm'
dllib=''
x11_include_dir=''
x11_lib_dir=''
graph_wanted=yes
pthread_wanted=yes
dl_defs=''
verbose=no
with_curses=yes
debugruntime=noruntimed
with_sharedlibs=yes
gcc_warnings="-Wall"
partialld="ld -r"
with_camlp4=camlp4
with_debugger=ocamldebugger
with_ocamldoc=ocamldoc
with_ocamlbuild=ocamlbuild
with_frame_pointers=false
TOOLPREF=""
with_cfi=true

# Try to turn internationalization off, can cause config.guess to malfunction!
unset LANG
unset LC_ALL LC_CTYPE LC_COLLATE LC_MESSAGES LC_MONETARY LC_NUMERIC LC_TIME

# Turn off some MacOS X debugging stuff, same reason
unset RC_TRACE_ARCHIVES RC_TRACE_DYLIBS RC_TRACE_PREBINDING_DISABLED

# The inf(), wrn(), err() functions below can be used to provide a consistent
# way to notify the user. The notification is always given to the stdout
# descriptor.
#
# Their output is redirected to a file-descriptor "3" which is then redirected
# to fd 1 at the level of the whole configure script. This is done to not
# conflict with how values are returned from functions in shell script.
# Consider the following where "It works!" would be mixed with "42".
#   do_foo() {
#     if some_command; then
#       inf "It works!"
#       echo "42"
#     fi
#   }
inf() {
  printf "%b\n" "$*" 1>&3
}

wrn() {
  printf "[WARNING] %b\n" "$*" 1>&3
}

err() {
  printf "[ERROR!]%b\n" "$*" 1>&3
  exit 2
}

exec 3>&1

# Parse command-line arguments

if echo "$configure_options" | grep -q -e '--\?[a-zA-Z0-9-]\+='; then
  err "Arguments to this script look like '-prefix /foo/bar', not '-prefix=/foo/bar' (note the '=')."
fi

while : ; do
  case "$1" in
    "") break;;
    -prefix|--prefix)
        prefix=$2; shift;;
    -bindir|--bindir)
        bindir=$2; shift;;
    -libdir|--libdir)
        libdir=$2; shift;;
    -mandir|--mandir)
        case "$2" in
          */man[1-9ln])
            mandir=`echo $2 | sed -e 's|^\(.*\)/man.$|\1|'`
            manext=`echo $2 | sed -e 's/^.*\(.\)$/\1/'`;;
          *)
            mandir=$2
            manext=1;;
        esac
        shift;;
    -host*|--host*)
        host_type=$2; shift;;
    -target*|--target*)
        target_type=$2; shift;;
    -cc*)
        ccoption="$2"; shift;;
    -as)
        asoption="$2"; shift;;
    -aspp)
        asppoption="$2"; shift;;
    -lib*)
        cclibs="$2 $cclibs"; shift;;
    -no-curses|--no-curses)
        with_curses=no;;
    -no-shared-libs|--no-shared-libs)
        with_sharedlibs=no;;
    -x11include*|--x11include*)
        x11_include_dir=$2; shift;;
    -x11lib*|--x11lib*)
        x11_lib_dir=$2; shift;;
    -no-graph|--no-graph) graph_wanted=no;;
    -with-pthread*|--with-pthread*)
        ;; # Ignored for backward compatibility
    -no-pthread*|--no-pthread*)
        pthread_wanted=no;;
    -partialld|--partialld)
        partialld="$2"; shift;;
    -dldefs*|--dldefs*)
        dl_defs="$2"; shift;;
    -dllibs*|--dllibs*)
        dllib="$2"; shift;;
    -verbose|--verbose)
        verbose=yes;;
    -with-debug-runtime|--with-debug-runtime)
        debugruntime=runtimed;;
    -no-camlp4|--no-camlp4)
        with_camlp4="";;
    -no-debugger|--no-debugger)
        with_debugger="";;
    -no-ocamldoc|--no-ocamldoc)
        with_ocamldoc="";;
    -no-ocamlbuild|--no-ocamlbuild)
        with_ocamlbuild="";;
    -with-frame-pointers|--with-frame-pointers)
        with_frame_pointers=true;;
    -no-cfi|--no-cfi)
        with_cfi=false;;
    *) err "Unknown option \"$1\".";;
  esac
  shift
done

# Sanity checks

case "$prefix" in
  /*) ;;
   *) err "The -prefix directory must be absolute.";;
esac
case "$bindir" in
  /*) ;;
  "") ;;
  '$(PREFIX)/'*) ;;
   *) err 'The -bindir directory must be absolute or relative to $(PREFIX).';;
esac
case "$libdir" in
  /*) ;;
  "") ;;
  '$(PREFIX)/'*) ;;
   *) err 'The -libdir directory must be absolute or relative to $(PREFIX).';;
esac
case "$mandir" in
  /*) ;;
  "") ;;
  '$(PREFIX)/'*) ;;
   *) err 'The -mandir directory must be absolute or relative to $(PREFIX).';;
esac

if test -n "$with_camlp4" -a -z "$with_ocamlbuild"; then
  err "Camlp4 is enabled but not ocamlbuild; building camlp4 is not possible without building ocamlbuild."
fi

# Generate the files

cd config/auto-aux
rm -f s.h m.h Makefile
touch s.h m.h Makefile

# Write options to Makefile

echo "# generated by ./configure $configure_options" >> Makefile

# Where to install

echo "PREFIX=$prefix" >> Makefile
case "$bindir" in
  "") echo 'BINDIR=$(PREFIX)/bin' >> Makefile
      bindir="$prefix/bin";;
   *) echo "BINDIR=$bindir" >> Makefile;;
esac
case "$libdir" in
  "") echo 'LIBDIR=$(PREFIX)/lib/ocaml' >> Makefile
      libdir="$prefix/lib/ocaml";;
   *) echo "LIBDIR=$libdir" >> Makefile;;
esac
echo 'STUBLIBDIR=$(LIBDIR)/stublibs' >> Makefile
case "$mandir" in
  "") echo 'MANDIR=$(PREFIX)/man' >> Makefile
      mandir="$prefix/man";;
   *) echo "MANDIR=$mandir" >> Makefile;;
esac
echo "MANEXT=$manext" >> Makefile

# Determine the system type

if test "$host_type" = "unknown"; then
  if host_type=`../gnu/config.guess`; then :; else
    err "Cannot guess host type. You must specify one with the -host option."
  fi
fi
if host=`../gnu/config.sub $host_type`; then :; else
  err "Please specify the correct host type with the -host option"
fi
inf "Configuring for host $host ..."

if test -n "$target_type"; then
  target="$target_type"
  TOOLPREF="${target}-"
else
  target="$host"
fi
inf "Configuring for target $target ..."

# Do we have gcc?

if test -z "$ccoption"; then
  if sh ./searchpath "${TOOLPREF}gcc"; then
    cc="${TOOLPREF}gcc"
  else
    if test x"$host" = x"$target"; then
      cc="cc"
    else
      err "No cross-compiler found for ${target}.\n" \
          "It should be named ${TOOLPREF}gcc and be in the PATH."
    fi
  fi
else
  cc="$ccoption"
fi

inf "Using compiler $cc."

# Check for buggy versions of GCC
# These checks are not done for cross-compilation (yet at least) because after
# 15 years, I doubt someone will try to use an experimental (2.96) or
# known-unstable (2.7.2.1) version for cross-compilation.

buggycc="no"

case "$target,$cc" in
  i[3456]86-*-*,gcc*)
    case `$cc --version` in
      2.7.2.1) cat <<'EOF'

WARNING: you are using gcc version 2.7.2.1 on an Intel x86 processor.
This version of gcc is known to generate incorrect code for the
OCaml runtime system on some Intel x86 machines. (The symptom
is a crash of boot/ocamlc when compiling stdlib/pervasives.mli.)
In particular, the version of gcc 2.7.2.1 that comes with
Linux RedHat 4.x / Intel is affected by this problem.
Other Linux distributions might also be affected.
If you are using one of these configurations, you are strongly advised
to use another version of gcc, such as 2.95, which are
known to work well with OCaml.

Press <enter> to proceed or <interrupt> to stop.
EOF
        read reply;;
      2.96*) cat <<'EOF'

WARNING: you are using gcc version 2.96 on an Intel x86 processor.
Certain patched versions of gcc 2.96 are known to generate incorrect
code for the OCaml runtime system.  (The symptom is a segmentation
violation on boot/ocamlc.)  Those incorrectly patched versions can be found
in RedHat 7.2 and Mandrake 8.0 and 8.1; other Linux distributions
might also be affected.  (See bug #57760 on bugzilla.redhat.com)

Auto-configuration will now select gcc compiler flags that work around
the problem.  Still, if you observe segmentation faults while running
ocamlc or ocamlopt, you are advised to try another version of gcc,
such as 2.95.3 or 3.2.

EOF
        buggycc="gcc.2.96";;

            esac;;
esac

# Configure the bytecode compiler

bytecc="$cc"
mkexe="\$(BYTECC)"
mkexedebugflag="-g"
bytecccompopts=""
bytecclinkopts=""
dllccompopts=""
ostype="Unix"
exe=""
iflexdir=""
SO=".so"
TOOLCHAIN="cc"

case "$bytecc,$target" in
  cc,*-*-nextstep*)
    # GNU C extensions disabled, but __GNUC__ still defined!
    bytecccompopts="-fno-defer-pop $gcc_warnings -U__GNUC__ -posix"
    bytecclinkopts="-posix";;
  *,*-*-rhapsody*)
    # Almost the same as NeXTStep
    bytecccompopts="-fno-defer-pop $gcc_warnings -DSHRINKED_GNUC"
    mathlib="";;
  *,*-*-darwin*)
    bytecccompopts="-fno-defer-pop $gcc_warnings"
    mathlib=""
    mkexe="$mkexe -Wl,-no_compact_unwind"
    # Tell gcc that we can use 32-bit code addresses for threaded code
    # unless we are compiled for a shared library (-fPIC option)
    echo "#ifndef __PIC__" >> m.h
    echo "#  define ARCH_CODE32" >> m.h
    echo "#endif" >> m.h;;
  *,*-*-beos*)
    bytecccompopts="-fno-defer-pop $gcc_warnings"
    # No -lm library
    mathlib="";;
  *gcc,alpha*-*-osf*)
    bytecccompopts="-fno-defer-pop $gcc_warnings"
    if cc="$bytecc" sh ./hasgot -mieee; then
      bytecccompopts="-mieee $bytecccompopts";
    fi
    # Put code and static data in lower 4GB
    bytecclinkopts="-Wl,-T,12000000 -Wl,-D,14000000"
    # Tell gcc that we can use 32-bit code addresses for threaded code
    echo "#define ARCH_CODE32" >> m.h;;
  cc,alpha*-*-osf*)
    bytecccompopts="-std1 -ieee";;
  *gcc*,alpha*-*-linux*)
    if cc="$bytecc" sh ./hasgot -mieee; then
      bytecccompopts="-mieee $bytecccompopts";
    fi;;
  cc,mips-*-irix6*)
    # Add -n32 flag to ensure compatibility with native-code compiler
    bytecccompopts="-n32"
    # Turn off warning "unused library"
    bytecclinkopts="-n32 -Wl,-woff,84";;
  cc*,mips-*-irix6*)
    # (For those who want to force "cc -64")
    # Turn off warning "unused library"
    bytecclinkopts="-Wl,-woff,84";;
  *,alpha*-*-unicos*)
    # For the Cray T3E
    bytecccompopts="-DUMK";;
  *gcc*,powerpc-*-aix*)
    # Avoid name-space pollution by requiring Unix98-conformant includes
    bytecccompopts="-fno-defer-pop $gcc_warnings -D_XOPEN_SOURCE=500";;
  *,powerpc-*-aix*)
    bytecccompopts="-D_XOPEN_SOURCE=500";;
  *gcc*,*-*-cygwin*)
    bytecccompopts="-fno-defer-pop $gcc_warnings -U_WIN32"
    dllccompopts="-U_WIN32 -DCAML_DLL"
    if test $with_sharedlibs = yes; then
      flexlink="flexlink -chain cygwin -merge-manifest -stack 16777216"
      flexdir=`$flexlink -where | dos2unix`
      if test -z "$flexdir"; then
        wrn "flexlink not found: native shared libraries won't be available."
        with_sharedlibs=no
      else
        iflexdir="-I\"$flexdir\""
        mkexe="$flexlink -exe"
        mkexedebugflag="-link -g"
      fi
    fi
    exe=".exe"
    ostype="Cygwin";;
  *gcc*,*-*-mingw*)
    bytecccompopts="-fno-defer-pop $gcc_warnings"
    dllccompopt="-DCAML_DLL"
    if test $with_sharedlibs = yes; then
      case "$target" in
        i686-*-*)   flexlink_chain="mingw";;
        x86_64-*-*) flexlink_chain="mingw64";;
      esac
      flexlink="flexlink -chain $flexlink_chain -merge-manifest -stack 16777216"
      flexdir=`$flexlink -where`
      if test -z "$flexdir"; then
        wrn "flexlink not found: native shared libraries won't be available."
        with_sharedlibs=no
      else
        iflexdir="-I\"$flexdir\""
        mkexe="$flexlink -exe"
        mkexedebugflag="-link -g"
      fi
    fi
    exe=".exe"
    ostype="Win32"
    TOOLCHAIN="mingw"
    SO=".dll"
    ;;
  *gcc*,x86_64-*-linux*)
    bytecccompopts="-fno-defer-pop $gcc_warnings"
    # Tell gcc that we can use 32-bit code addresses for threaded code
    # unless we are compiled for a shared library (-fPIC option)
    echo "#ifndef __PIC__" >> m.h
    echo "#  define ARCH_CODE32" >> m.h
    echo "#endif" >> m.h;;
  *gcc*)
    bytecccompopts="-fno-defer-pop $gcc_warnings";;
esac

# Configure compiler to use in further tests

cc="$bytecc -O $bytecclinkopts"
export cc cclibs verbose

# Check C compiler

sh ./runtest ansi.c
case $? in
  0) inf "The C compiler is ANSI-compliant." ;;
  1) err "The C compiler $cc is not ANSI-compliant.\n" \
         "You need an ANSI C compiler to build OCaml.";;
  *)
     if test x"$host" != x"$target"; then
       wrn "Unable to compile the test program.\n" \
           "This failure is expected for cross-compilation:\n" \
           "we will assume the C compiler is ANSI-compliant."
     else
       err "Unable to compile the test program.\n" \
           "Make sure the C compiler $cc is properly installed."
     fi;;
esac

# Determine which ocamlrun executable to use; for cross-compilation, a native
# "ocamlrun" executable must be available on the system.
if test x"$target" != x"$host"; then
  if ! sh ./searchpath ocamlrun; then
    err "Cross-compilation requires an ocaml runtime environment (the ocamlrun binary). Moreover, its version must be the same as the one you're trying to build (`cut -f1 -d+ < ../../VERSION`)."
  else
    # Make sure the version of the system ocaml and the version of these
    # sources match. Don't compare "+devXX" on purpose as it would be too
    # annoying during development and people using SVN are expected to know
    # what they're doing and how to handle basic issues.
    ocaml_system_version=`ocamlc -version | cut -f1 -d+`
    ocaml_source_version=`sed -n '1 s/\([0-9\.]\+\).*/\1/ p' < ../../VERSION`
    if test x"$ocaml_system_version" != x"$ocaml_source_version"; then
      err "The system OCaml toolchain is $ocaml_system_version but these sources are $ocaml_source_version.\nBuilding a cross-compiler requires versions to match."
    else
      camlrun="ocamlrun"
    fi
  fi
else
  rootdir=`cd ../.. && pwd`
  camlrun=$rootdir/boot/ocamlrun
fi

# Check the sizes of data types
# OCaml needs a 32 or 64bit architectue and a 32-bit integer type.

inf "Checking the sizes of integers and pointers..."
ret=`sh ./runtest sizes.c`

if test "$?" -eq 0; then
  set $ret
  case "$2,$3" in
    4,4) inf "OK, this is a regular 32 bit architecture."
         echo "#undef ARCH_SIXTYFOUR" >> m.h
         arch64=false;;
    *,8) inf "Wow! A 64 bit architecture!"
         echo "#define ARCH_SIXTYFOUR" >> m.h
         arch64=true
         if test $1 != 4 && test $2 != 4 && test $4 != 4; then
           err "Sorry, we can't find a 32-bit integer type\n" \
               "(sizeof(short) = $4, sizeof(int) = $1, sizeof(long) = $2)\n" \
               "OCaml won't run on this architecture."
         fi;;
    *,*) err "This architecture seems to be neither 32 bits nor 64 bits.\n" \
             "OCaml won't run on this architecture.";;
  esac
else
  # For cross-compilation, runtest always fails: add special handling.
  case "$target" in
    i686-*-mingw*) inf "OK, this is a regular 32 bit architecture."
                   echo "#undef ARCH_SIXTYFOUR" >> m.h
                   set 4 4 4 2
                   arch64=false;;
    x86_64-*-mingw*) inf "Wow! A 64 bit architecture!"
                     echo "#define ARCH_SIXTYFOUR" >> m.h
                     set 4 4 8 2
                     arch64=true;;
    *) err "Since datatype sizes cannot be guessed when cross-compiling,\n" \
           "a hardcoded list is used but your architecture isn't known yet.\n" \
           "You need to determine the sizes yourself.\n" \
           "Please submit a bug report in order to expand the list." ;;
  esac
fi

echo "#define SIZEOF_INT $1" >> m.h
echo "#define SIZEOF_LONG $2" >> m.h
echo "#define SIZEOF_PTR $3" >> m.h
echo "#define SIZEOF_SHORT $4" >> m.h

if test $2 = 8; then
     echo "#define ARCH_INT64_TYPE long" >> m.h
     echo "#define ARCH_UINT64_TYPE unsigned long" >> m.h
     echo '#define ARCH_INT64_PRINTF_FORMAT "l"' >> m.h
     int64_native=true
else
  sh ./runtest longlong.c
  case $? in
  0) inf "64-bit \"long long\" integer type found (printf with \"%ll\")."
     echo "#define ARCH_INT64_TYPE long long" >> m.h
     echo "#define ARCH_UINT64_TYPE unsigned long long" >> m.h
     echo '#define ARCH_INT64_PRINTF_FORMAT "ll"' >> m.h
     int64_native=true;;
  1) inf "64-bit \"long long\" integer type found (printf with \"%q\")."
     echo "#define ARCH_INT64_TYPE long long" >> m.h
     echo "#define ARCH_UINT64_TYPE unsigned long long" >> m.h
     echo '#define ARCH_INT64_PRINTF_FORMAT "q"' >> m.h
     int64_native=true;;
  2) inf "64-bit \"long long\" integer type found (but no printf)."
     echo "#define ARCH_INT64_TYPE long long" >> m.h
     echo "#define ARCH_UINT64_TYPE unsigned long long" >> m.h
     echo '#undef ARCH_INT64_PRINTF_FORMAT' >> m.h
     int64_native=true;;
  *)
     case "$target" in
       *-*-mingw*)
         inf "No suitable 64-bit integer type found, will use software emulation."
         echo "#define ARCH_INT64_TYPE long long" >> m.h
         echo "#define ARCH_UINT64_TYPE unsigned long long" >> m.h
         echo '#define ARCH_INT64_PRINTF_FORMAT "I64"' >> m.h
         int64_native=true;;
       *)
         wrn "No suitable 64-bit integer type found, will use software emulation."
         echo "#undef ARCH_INT64_TYPE" >> m.h
         echo "#undef ARCH_UINT64_TYPE" >> m.h
         echo '#undef ARCH_INT64_PRINTF_FORMAT' >> m.h
         int64_native=false;;
     esac;;
  esac
fi

if test $3 = 8 && test $int64_native = false; then
  err "This architecture has 64-bit pointers but no 64-bit integer type.\n" \
      "OCaml won't run on this architecture."
fi

# Determine endianness

sh ./runtest endian.c
case $? in
  0) inf "This is a big-endian architecture."
     echo "#define ARCH_BIG_ENDIAN" >> m.h;;
  1) inf "This is a little-endian architecture."
     echo "#undef ARCH_BIG_ENDIAN" >> m.h;;
  2) err "This architecture seems to be neither big endian nor little endian.\n" \
         "OCaml won't run on this architecture.";;
  *) case $target in
       *-*-mingw*) inf "This is a little-endian architecture."
                   echo "#undef ARCH_BIG_ENDIAN" >> m.h;;
       *) wrn "Something went wrong during endianness determination.\n" \
              "You will have to figure out endianness yourself (option ARCH_BIG_ENDIAN in m.h).";;
     esac;;
esac

# Determine alignment constraints

case "$target" in
  sparc*-*-*|hppa*-*-*|arm*-*-*|mips*-*-*)
    # On Sparc V9 with certain versions of gcc, determination of double
    # alignment is not reliable (PR#1521), hence force it.
    # Same goes for hppa.
    # PR#5088 suggests same problem on ARM.
    # PR#5280 reports same problem on MIPS.
    # But there's a knack (PR#2572):
    # if we're in 64-bit mode (sizeof(long) == 8),
    # we must not doubleword-align floats...
    if test $2 = 8; then
      inf "Doubles can be word-aligned."
      echo "#undef ARCH_ALIGN_DOUBLE" >> m.h
    else
      inf "Doubles must be doubleword-aligned."
      echo "#define ARCH_ALIGN_DOUBLE" >> m.h
    fi;;
  *)
    sh ./runtest dblalign.c
    case $? in
      0) inf "Doubles can be word-aligned."
         echo "#undef ARCH_ALIGN_DOUBLE" >> m.h;;
      1) inf "Doubles must be doubleword-aligned."
         echo "#define ARCH_ALIGN_DOUBLE" >> m.h;;
      *) case "$target" in
           *-*-mingw*) inf "Doubles can be word-aligned."
                       echo "#undef ARCH_ALIGN_DOUBLE" >> m.h;;
           *) wrn "Something went wrong during alignment determination for doubles.\n" \
                  "We will assume alignment constraints over doubles.\n" \
                  "That's a safe bet: OCaml will work even if\n" \
                  "this architecture actually has no alignment constraints."
              echo "#define ARCH_ALIGN_DOUBLE" >> m.h;;
         esac;;
    esac;;
esac

if $int64_native; then
  case "$target" in
    # PR#5088: autodetection is unreliable on ARM.  PR#5280: also on MIPS.
    sparc*-*-*|hppa*-*-*|arm*-*-*|mips*-*-*)
      if test $2 = 8; then
        inf "64-bit integers can be word-aligned."
        echo "#undef ARCH_ALIGN_INT64" >> m.h
      else
        inf "64-bit integers must be doubleword-aligned."
        echo "#define ARCH_ALIGN_INT64" >> m.h
      fi;;
    *-*-mingw*) true;; # Nothing is in config/m-nt.h so don't add anything.
    *)
      sh ./runtest int64align.c
      case $? in
        0) inf "64-bit integers can be word-aligned."
           echo "#undef ARCH_ALIGN_INT64" >> m.h;;
        1) inf "64-bit integers must be doubleword-aligned."
           echo "#define ARCH_ALIGN_INT64" >> m.h;;
        *) wrn "Something went wrong during alignment determination for\n" \
               "64-bit integers. I'm going to assume this architecture has\n" \
               "alignment constraints. That's a safe bet: OCaml will work\n" \
               "even if this architecture has actually no alignment\n" \
               "constraints." \
           echo "#define ARCH_ALIGN_INT64" >> m.h;;
      esac
  esac
else
  echo "#undef ARCH_ALIGN_INT64" >> m.h
fi

# Check semantics of division and modulus

sh ./runtest divmod.c
case $? in
  0) inf "Native division and modulus have round-towards-zero semantics," \
         "will use them."
     echo "#undef NONSTANDARD_DIV_MOD" >> m.h;;
  1) inf "Native division and modulus do not have round-towards-zero"
         "semantics, will use software emulation."
     echo "#define NONSTANDARD_DIV_MOD" >> m.h;;
  *) case $target in
       *-*-mingw*) inf "Native division and modulus have round-towards-zero" \
                       "semantics, will use them."
                   echo "#undef NONSTANDARD_DIV_MOD" >> m.h;;
       *) wrn "Something went wrong while checking native division and modulus"\
              "please report it at http://http://caml.inria.fr/mantis/"
          echo "#define NONSTANDARD_DIV_MOD" >> m.h;;
     esac;;
esac

# Shared library support

shared_libraries_supported=false
dl_needs_underscore=false
sharedcccompopts=''
mksharedlib=''
byteccrpath=''
mksharedlibrpath=''
natdynlinkopts=""

if test $with_sharedlibs = "yes"; then
  case "$target" in
    *-*-cygwin*)
      mksharedlib="$flexlink"
      mkmaindll="$flexlink -maindll"
      shared_libraries_supported=true;;
    *-*-mingw*)
      mksharedlib="$flexlink"
      mkmaindll="$flexlink -maindll"
      shared_libraries_supported=true;;
    *-*-linux-gnu|*-*-linux|*-*-freebsd[3-9]*|*-*-freebsd[1-9][0-9]*|*-*-openbsd*|*-*-netbsd*|*-*-gnu*)
      sharedcccompopts="-fPIC"
      mksharedlib="$bytecc -shared"
      bytecclinkopts="$bytecclinkopts -Wl,-E"
      byteccrpath="-Wl,-rpath,"
      mksharedlibrpath="-Wl,-rpath,"
      natdynlinkopts="-Wl,-E"
      shared_libraries_supported=true;;
    alpha*-*-osf*)
      case "$bytecc" in
        *gcc*)
          sharedcccompopts="-fPIC"
          mksharedlib="$bytecc -shared"
          byteccrpath="-Wl,-rpath,"
          mksharedlibrpath="-Wl,-rpath,"
          shared_libraries_supported=true;;
        cc*)
          sharedcccompopts=""
          mksharedlib="ld -shared -expect_unresolved '*'"
          byteccrpath="-Wl,-rpath,"
          mksharedlibrpath="-rpath "
          shared_libraries_supported=true;;
      esac;;
    *-*-solaris2*)
      case "$bytecc" in
        *gcc*)
          sharedcccompopts="-fPIC"
          if sh ./solaris-ld; then
            mksharedlib="$bytecc -shared"
            byteccrpath="-R"
            mksharedlibrpath="-R"
          else
            mksharedlib="$bytecc -shared"
            bytecclinkopts="$bytecclinkopts -Wl,-E"
            natdynlinkopts="-Wl,-E"
            byteccrpath="-Wl,-rpath,"
            mksharedlibrpath="-Wl,-rpath,"
          fi
          shared_libraries_supported=true;;
        *)
          sharedcccompopts="-KPIC"
          byteccrpath="-R"
          mksharedlibrpath="-R"
          mksharedlib="/usr/ccs/bin/ld -G"
          shared_libraries_supported=true;;
      esac;;
    mips*-*-irix[56]*)
      case "$bytecc" in
        cc*) sharedcccompopts="";;
        *gcc*) sharedcccompopts="-fPIC";;
      esac
      mksharedlib="ld -shared -rdata_shared"
      byteccrpath="-Wl,-rpath,"
      mksharedlibrpath="-rpath "
      shared_libraries_supported=true;;
    i[3456]86-*-darwin[89].*)
      mksharedlib="$bytecc -bundle -flat_namespace -undefined suppress -read_only_relocs suppress"
      bytecccompopts="$dl_defs $bytecccompopts"
      dl_needs_underscore=false
      shared_libraries_supported=true;;
    *-apple-darwin*)
      mksharedlib="$bytecc -bundle -flat_namespace -undefined suppress -Wl,-no_compact_unwind"
      bytecccompopts="$dl_defs $bytecccompopts"
      dl_needs_underscore=false
      shared_libraries_supported=true;;
    m88k-*-openbsd*)
      shared_libraries_supported=false;;
    vax-*-openbsd*)
      shared_libraries_supported=false;;
    *-*-openbsd*)
      sharedcccompopts="-fPIC"
      mksharedlib="$bytecc -shared"
      bytecclinkopts="$bytecclinkopts -Wl,-E"
      natdynlinkopts="-Wl,-E"
      byteccrpath="-Wl,-rpath,"
      mksharedlibrpath="-Wl,-rpath,"
      shared_libraries_supported=true;;
  esac
fi

if test -z "$mkmaindll"; then
  mkmaindll=$mksharedlib
fi

# Configure native dynlink

natdynlink=false

if test $with_sharedlibs = "yes"; then
  case "$target" in
    *-*-cygwin*)                  natdynlink=true;;
    *-*-mingw*)                   natdynlink=true;;
    i[3456]86-*-linux*)           natdynlink=true;;
    i[3456]86-*-gnu*)             natdynlink=true;;
    x86_64-*-linux*)              natdynlink=true;;
    i[3456]86-*-darwin[89].*)     natdynlink=true;;
    i[3456]86-*-darwin*)
      if test $arch64 == true; then
        natdynlink=true
      fi;;
    x86_64-*-darwin*)             natdynlink=true;;
    powerpc*-*-linux*)            natdynlink=true;;
    sparc*-*-linux*)              natdynlink=true;;
    i686-*-kfreebsd*)             natdynlink=true;;
    x86_64-*-kfreebsd*)           natdynlink=true;;
    i[345]86-*-freebsd*)          natdynlink=true;;
    x86_64-*-freebsd*)            natdynlink=true;;
    i[345]86-*-openbsd*)          natdynlink=true;;
    x86_64-*-openbsd*)            natdynlink=true;;
    i[345]86-*-netbsd*)           natdynlink=true;;
    x86_64-*-netbsd*)             natdynlink=true;;
    i386-*-gnu0.3)                natdynlink=true;;
    arm*-*-linux*)                natdynlink=true;;
    aarch64-*-linux*)             natdynlink=true;;
  esac
fi

if test $natdynlink = "true"; then
  cmxs="cmxs"
else
  cmxs="cmxa"
fi


# Configure the native-code compiler

arch=none
model=default
system=unknown

case "$target" in
  sparc*-*-solaris2.*)          arch=sparc; system=solaris;;
  sparc*-*-*bsd*)               arch=sparc; system=bsd;;
  sparc*-*-linux*)              arch=sparc; system=linux;;
  sparc*-*-gnu*)                arch=sparc; system=gnu;;
  i[3456]86-*-linux*)           arch=i386; system=linux_`sh ./runtest elf.c`;;
  i[3456]86-*-*bsd*)            arch=i386; system=bsd_`sh ./runtest elf.c`;;
  i[3456]86-*-nextstep*)        arch=i386; system=nextstep;;
  i[3456]86-*-solaris*)         if $arch64; then
                                  arch=amd64; system=solaris
                                else
                                  arch=i386; system=solaris
                                fi;;
  i[3456]86-*-beos*)            arch=i386; system=beos;;
  i[3456]86-*-cygwin*)          arch=i386; system=cygwin;;
  i[3456]86-*-darwin*)          if $arch64; then
                                  arch=amd64; system=macosx
                                else
                                  arch=i386; system=macosx
                                fi;;
  i[3456]86-*-gnu*)             arch=i386; system=gnu;;
  i[3456]86-*-mingw*)           arch=i386; system=mingw;;
  powerpc*-*-linux*)            arch=power; model=ppc; system=elf;;
  powerpc-*-netbsd*)            arch=power; model=ppc; system=elf;;
  powerpc-*-openbsd*)           arch=power; model=ppc; system=bsd_elf;;
  powerpc-*-rhapsody*)          arch=power; model=ppc; system=rhapsody;;
  powerpc-*-darwin*)            arch=power; system=rhapsody
                                if $arch64;then model=ppc64;else model=ppc;fi;;
  armv6*-*-linux-gnueabihf)     arch=arm; model=armv6; system=linux_eabihf;;
  arm*-*-linux-gnueabihf)       arch=arm; system=linux_eabihf;;
  armv7*-*-linux-gnueabi)       arch=arm; model=armv7; system=linux_eabi;;
  armv6t2*-*-linux-gnueabi)     arch=arm; model=armv6t2; system=linux_eabi;;
  armv6*-*-linux-gnueabi)       arch=arm; model=armv6; system=linux_eabi;;
  armv5te*-*-linux-gnueabi)     arch=arm; model=armv5te; system=linux_eabi;;
  armv5*-*-linux-gnueabi)       arch=arm; model=armv5; system=linux_eabi;;
  arm*-*-linux-gnueabi)         arch=arm; system=linux_eabi;;
  x86_64-*-linux*)              arch=amd64; system=linux;;
  x86_64-*-gnu*)                arch=amd64; system=gnu;;
  x86_64-*-freebsd*)            arch=amd64; system=freebsd;;
  x86_64-*-netbsd*)             arch=amd64; system=netbsd;;
  x86_64-*-openbsd*)            arch=amd64; system=openbsd;;
  x86_64-*-darwin*)             arch=amd64; system=macosx;;
  x86_64-*-mingw*)              arch=amd64; system=mingw;;
  aarch64-*-linux*)             arch=arm64; system=linux;;
esac

# Some platforms exist both in 32-bit and 64-bit variants, not distinguished
# by $target.  Turn off native code compilation on platforms where 64-bit mode
# is not supported.  (PR#4441)

if $arch64; then
  case "$arch,$model" in
    sparc,default|power,ppc)
      arch=none; model=default; system=unknown;;
  esac
fi

if test -z "$ccoption"; then
  nativecc="$bytecc"
else
  nativecc="$ccoption"
fi

nativecccompopts=''
nativecclinkopts=''
# FIXME the naming of nativecclinkopts is broken: these are options for
# ld (for shared libs), not for cc
nativeccrpath="$byteccrpath"

case "$arch,$nativecc,$system,$target" in
  *,*,nextstep,*)      nativecccompopts="$gcc_warnings -U__GNUC__ -posix"
                       nativecclinkopts="-posix";;
  *,*,rhapsody,*darwin[1-5].*)
                       nativecccompopts="$gcc_warnings -DSHRINKED_GNUC";;
  *,*,rhapsody,*)      nativecccompopts="$gcc_warnings -DDARWIN_VERSION_6 $dl_defs"
                       if $arch64; then partialld="ld -r -arch ppc64"; fi;;
  *,gcc*,cygwin,*)     nativecccompopts="$gcc_warnings -U_WIN32";;
  amd64,gcc*,macosx,*) partialld="ld -r -arch x86_64";;
  amd64,gcc*,solaris,*) partialld="ld -r -m elf_x86_64";;
  *,gcc*,*,*)          nativecccompopts="$gcc_warnings";;
esac

asppprofflags='-DPROFILING'

case "$arch,$system" in
  amd64,macosx)   if ./searchpath clang; then
                      as='clang -arch x86_64 -c'
                      aspp='clang -arch x86_64 -c'
                    else
                      as="${TOOLPREF}as -arch x86_64"
                      aspp="${TOOLPREF}gcc -arch x86_64 -c"
                    fi;;
  amd64,solaris)  as="${TOOLPREF}as --64"
                  aspp="${TOOLPREF}gcc -m64 -c";;
  i386,solaris)   as="${TOOLPREF}as"
                  aspp="/usr/ccs/bin/${TOOLPREF}as -P";;
  power,elf)      as="${TOOLPREF}as -u -m ppc"
                  aspp="${TOOLPREF}gcc -c";;
  power,rhapsody) as="${TOOLPREF}as -arch $model"
                  aspp="$bytecc -c";;
  sparc,solaris)  as="${TOOLPREF}as"
                  case "$cc" in
                    *gcc*) aspp="${TOOLPREF}gcc -c";;
                              *) aspp="${TOOLPREF}as -P";;
                  esac;;
  amd64,*|arm,*|arm64,*|i386,*|power,bsd*|sparc,*)
                  as="${TOOLPREF}as"
                  aspp="${TOOLPREF}gcc -c";;
esac

if test -n "$asoption"; then as="$asoption"; fi
if test -n "$asppoption"; then aspp="$asppoption"; fi

cc_profile='-pg'
case "$arch,$system" in
  i386,linux_elf) profiling='prof';;
  i386,gnu) profiling='prof';;
  i386,bsd_elf) profiling='prof';;
  amd64,macosx) profiling='prof';;
  i386,macosx) profiling='prof';;
  sparc,solaris)
    profiling='prof'
    case "$nativecc" in gcc*) ;; *) cc_profile='-xpg';; esac;;
  amd64,linux) profiling='prof';;
  amd64,gnu) profiling='prof';;
  arm,linux*) profiling='prof';;
  *) profiling='noprof';;
esac

# Where is ranlib?

if sh ./searchpath ${TOOLPREF}ranlib; then
  inf "ranlib found"
  echo "RANLIB=${TOOLPREF}ranlib" >> Makefile
  echo "RANLIBCMD=${TOOLPREF}ranlib" >> Makefile
else
  inf "ranlib not used"
  echo "RANLIB=${TOOLPREF}ar rs" >> Makefile
  echo "RANLIBCMD=" >> Makefile
fi

echo "ARCMD=${TOOLPREF}ar" >> Makefile


# Write the OS type (Unix or Cygwin)

echo "#define OCAML_OS_TYPE \"$ostype\"" >> s.h
echo "#define OCAML_STDLIB_DIR \"$libdir\"" >> s.h

# Do #! scripts work?

if (SHELL=/bin/sh; export SHELL; (./sharpbang || ./sharpbang2) >/dev/null); then
  inf "#! appears to work in shell scripts."
  case "$target" in
    *-*-sunos*|*-*-unicos*)
      wrn "We won't use it, though, because under SunOS and Unicos it breaks " \
          "on pathnames longer than 30 characters"
      echo "SHARPBANGSCRIPTS=false" >> Makefile;;
    *-*-cygwin*)
      wrn "We won't use it, though, because of conflicts with .exe extension " \
          "under Cygwin"
      echo "SHARPBANGSCRIPTS=false" >> Makefile;;
    *-*-mingw*)
      inf "We won't use it, though, because it's on the target platform it would be used and windows doesn't support it."
      echo "SHARPBANGSCRIPTS=false" >> Makefile;;
    *)
      echo "SHARPBANGSCRIPTS=true" >> Makefile;;
  esac
else
  inf "No support for #! in shell scripts"
  echo "SHARPBANGSCRIPTS=false" >> Makefile
fi

# Use 64-bit file offset if possible

bytecccompopts="$bytecccompopts -D_FILE_OFFSET_BITS=64"
nativecccompopts="$nativecccompopts -D_FILE_OFFSET_BITS=64"

# Check the semantics of signal handlers

if sh ./hasgot sigaction sigprocmask; then
  inf "POSIX signal handling found."
  echo "#define POSIX_SIGNALS" >> s.h
else
  if sh ./runtest signals.c; then
    inf "Signals have the BSD semantics."
    echo "#define BSD_SIGNALS" >> s.h
  else
    inf "Signals have the System V semantics."
  fi
  if sh ./hasgot sigsetmask; then
    inf "sigsetmask() found"
    echo "#define HAS_SIGSETMASK" >> s.h
  fi
fi

# For the Pervasives module

if sh ./hasgot2 -i math.h $mathlib expm1 log1p hypot copysign; then
  inf "expm1(), log1p(), hypot(), copysign() found."
  echo "#define HAS_C99_FLOAT_OPS" >> s.h
fi

# For the Sys module

if sh ./hasgot getrusage; then
  inf "getrusage() found."
  echo "#define HAS_GETRUSAGE" >> s.h
fi

if sh ./hasgot times; then
  inf "times() found."
  echo "#define HAS_TIMES" >> s.h
fi

# For the terminfo module

if test "$with_curses" = "yes"; then
  for libs in "" "-lcurses" "-ltermcap" "-lcurses -ltermcap" "-lncurses"; do
    if sh ./hasgot $libs tgetent tgetstr tgetnum tputs; then
      inf "termcap functions found (with libraries '$libs')"
      echo "#define HAS_TERMCAP" >> s.h
      curseslibs="${libs}"
      break
    fi
  done
fi

# Configuration for the libraries

case "$system" in
  mingw) unix_or_win32="win32"; unixlib="win32unix"; graphlib="win32graph";;
  *) unix_or_win32="unix"; unixlib="unix"; graphlib="graph";;
esac

echo "UNIX_OR_WIN32=$unix_or_win32" >> Makefile
echo "UNIXLIB=$unixlib" >> Makefile
echo "GRAPHLIB=$graphlib" >> Makefile

otherlibraries="$unixlib str num dynlink bigarray"

# For the Unix library

has_sockets=no
if sh ./hasgot socket socketpair bind listen accept connect; then
  inf "You have BSD sockets."
  echo "#define HAS_SOCKETS" >> s.h
  has_sockets=yes
elif sh ./hasgot -lnsl -lsocket socket socketpair bind listen accept connect; then
  inf "You have BSD sockets (with libraries '-lnsl -lsocket')"
  cclibs="$cclibs -lnsl -lsocket"
  echo "#define HAS_SOCKETS" >> s.h
  has_sockets=yes
else
  case "$target" in
    *-*-mingw*)
      inf "You have BSD sockets (with libraries '-lws2_32')"
      cclibs="$cclibs -lws2_32"
      echo "#define HAS_SOCKETS" >> s.h
      has_sockets=yes ;;
    *) ;;
  esac
fi

if sh ./hasgot -i sys/socket.h -t socklen_t; then
  inf "socklen_t is defined in <sys/socket.h>"
  echo "#define HAS_SOCKLEN_T" >> s.h
fi

if sh ./hasgot inet_aton; then
  inf "inet_aton() found."
  echo "#define HAS_INET_ATON" >> s.h
fi

if sh ./hasgot -i sys/types.h -i sys/socket.h -i netinet/in.h \
               -t 'struct sockaddr_in6' \
&& sh ./hasgot getaddrinfo getnameinfo inet_pton inet_ntop; then
  inf "IPv6 is supported."
  echo "#define HAS_IPV6" >> s.h
fi

if sh ./hasgot -i unistd.h; then
  inf "unistd.h found."
  echo "#define HAS_UNISTD" >> s.h
fi

if sh ./hasgot -i sys/types.h -t off_t; then
  inf "off_t is defined in <sys/types.h>"
  echo "#define HAS_OFF_T" >> s.h
fi

if sh ./hasgot -i sys/types.h -i dirent.h; then
  inf "dirent.h found."
  echo "#define HAS_DIRENT" >> s.h
fi

if sh ./hasgot rewinddir; then
  inf "rewinddir() found."
  echo "#define HAS_REWINDDIR" >> s.h
fi

if sh ./hasgot lockf; then
  inf "lockf() found."
  echo "#define HAS_LOCKF" >> s.h
fi

if sh ./hasgot mkfifo; then
  inf "mkfifo() found."
  echo "#define HAS_MKFIFO" >> s.h
fi

if sh ./hasgot getcwd; then
  inf "getcwd() found."
  echo "#define HAS_GETCWD" >> s.h
fi

if sh ./hasgot getwd; then
  inf "getwd() found."
  echo "#define HAS_GETWD" >> s.h
fi

if sh ./hasgot getpriority setpriority; then
  inf "getpriority() found."
  echo "#define HAS_GETPRIORITY" >> s.h
fi

if sh ./hasgot -i sys/types.h -i utime.h && sh ./hasgot utime; then
  inf "utime() found."
  echo "#define HAS_UTIME" >> s.h
fi

if sh ./hasgot utimes; then
  inf "utimes() found."
  echo "#define HAS_UTIMES" >> s.h
fi

if sh ./hasgot dup2; then
  inf "dup2() found."
  echo "#define HAS_DUP2" >> s.h
fi

if sh ./hasgot fchmod fchown; then
  inf "fchmod() found."
  echo "#define HAS_FCHMOD" >> s.h
fi

if sh ./hasgot truncate ftruncate; then
  inf "truncate() found."
  echo "#define HAS_TRUNCATE" >> s.h
fi

select_include=''
if sh ./hasgot -i sys/types.h -i sys/select.h; then
  inf "sys/select.h found."
  echo "#define HAS_SYS_SELECT_H" >> s.h
  select_include='-i sys/select.h'
fi

has_select=no
if sh ./hasgot select && \
   sh ./hasgot -i sys/types.h $select_include -t fd_set ; then
  inf "select() found."
  echo "#define HAS_SELECT" >> s.h
  has_select=yes
fi

if sh ./hasgot symlink readlink lstat;  then
  inf "symlink() found."
  echo "#define HAS_SYMLINK" >> s.h
fi

has_wait=no
if sh ./hasgot waitpid;  then
  inf "waitpid() found."
  echo "#define HAS_WAITPID" >> s.h
  has_wait=yes
fi

if sh ./hasgot wait4;  then
  inf "wait4() found."
  echo "#define HAS_WAIT4" >> s.h
  has_wait=yes
fi

if sh ./hasgot -i limits.h && sh ./runtest getgroups.c; then
  inf "getgroups() found."
  echo "#define HAS_GETGROUPS" >> s.h
fi

if sh ./hasgot -i limits.h -i grp.h && sh ./runtest setgroups.c; then
  inf "setgroups() found."
  echo "#define HAS_SETGROUPS" >> s.h
fi

if sh ./hasgot -i limits.h -i grp.h && sh ./runtest initgroups.c; then
  inf "initgroups() found."
  echo "#define HAS_INITGROUPS" >> s.h
fi

if sh ./hasgot -i termios.h &&
   sh ./hasgot tcgetattr tcsetattr tcsendbreak tcflush tcflow; then
  inf "POSIX termios found."
  echo "#define HAS_TERMIOS" >> s.h
fi

if sh ./runtest async_io.c; then
  inf "Asynchronous I/O are supported."
  echo "#define HAS_ASYNC_IO" >> s.h
fi

has_setitimer=no
if sh ./hasgot setitimer; then
  inf "setitimer() found."
  echo "#define HAS_SETITIMER" >> s.h
  has_setitimer="yes"
fi

if sh ./hasgot gethostname; then
  inf "gethostname() found."
  echo "#define HAS_GETHOSTNAME" >> s.h
fi

if sh ./hasgot -i sys/utsname.h && sh ./hasgot uname; then
  inf "uname() found."
  echo "#define HAS_UNAME" >> s.h
fi

has_gettimeofday=no
if sh ./hasgot gettimeofday; then
  inf "gettimeofday() found."
  echo "#define HAS_GETTIMEOFDAY" >> s.h
  has_gettimeofday="yes"
fi

if sh ./hasgot mktime; then
  inf "mktime() found."
  echo "#define HAS_MKTIME" >> s.h
fi

case "$target" in
  *-*-cygwin*) ;;  # setsid emulation under Cygwin breaks the debugger
  *) if sh ./hasgot setsid; then
       inf "setsid() found."
       echo "#define HAS_SETSID" >> s.h
     fi;;
esac

if sh ./hasgot putenv; then
  inf "putenv() found."
  echo "#define HAS_PUTENV" >> s.h
fi

if sh ./hasgot -i locale.h && sh ./hasgot setlocale; then
  inf "setlocale() and <locale.h> found."
  echo "#define HAS_LOCALE" >> s.h
fi


if sh ./hasgot $dllib dlopen; then
  inf "dlopen() found."
elif sh ./hasgot $dllib -ldl dlopen; then
  inf "dlopen() found in -ldl."
  dllib="$dllib -ldl"
else
  case "$target" in
    *-*-mingw*) ;;
    *) shared_libraries_supported=false
  esac
fi

if $shared_libraries_supported; then
  inf "Dynamic loading of shared libraries is supported."
  echo "#define SUPPORT_DYNAMIC_LINKING" >> s.h
  if $dl_needs_underscore; then
    echo '#define DL_NEEDS_UNDERSCORE' >>s.h
  fi
fi

if sh ./hasgot -i sys/types.h -i sys/mman.h && sh ./hasgot mmap munmap; then
  inf "mmap() found."
  echo "#define HAS_MMAP" >> s.h
fi

if sh ./hasgot pwrite; then
  inf "pwrite() found"
  echo "#define HAS_PWRITE" >> s.h
fi

nargs=none
for i in 5 6; do
  if sh ./trycompile -DNUM_ARGS=${i} gethostbyname.c; then nargs=$i; break; fi
done
if test $nargs != "none"; then
  inf "gethostbyname_r() found (with ${nargs} arguments)."
  echo "#define HAS_GETHOSTBYNAME_R $nargs" >> s.h
fi

nargs=none
for i in 7 8; do
  if sh ./trycompile -DNUM_ARGS=${i} gethostbyaddr.c; then nargs=$i; break; fi
done
if test $nargs != "none"; then
  inf "gethostbyaddr_r() found (with ${nargs} arguments)."
  echo "#define HAS_GETHOSTBYADDR_R $nargs" >> s.h
fi

# Determine if the debugger is supported

if test -n "$with_debugger"; then
  if test "$has_sockets" = "yes"; then
    inf "Replay debugger supported."
    with_debugger="ocamldebugger"
  else
    inf "No replay debugger (missing system calls)"
    with_debugger=""
  fi
fi

# Determine if system stack overflows can be detected

case "$arch,$system" in
  i386,linux_elf|amd64,linux|power,rhapsody|amd64,macosx|i386,macosx)
    inf "System stack overflow can be detected."
    echo "#define HAS_STACK_OVERFLOW_DETECTION" >> s.h;;
  *)
    inf "Cannot detect system stack overflow.";;
esac

# Determine the target architecture for the "num" library

case "$arch" in
  i386)     bng_arch=ia32
            if sh ./trycompile ia32sse2.c
            then bng_asm_level=2
            else bng_asm_level=1
            fi;;
  power)    bng_arch=ppc; bng_asm_level=1;;
  amd64)    bng_arch=amd64; bng_asm_level=1;;
  arm64)    bng_arch=arm64; bng_asm_level=1;;
  *)        bng_arch=generic; bng_asm_level=0;;
esac

echo "BNG_ARCH=$bng_arch" >> Makefile
echo "BNG_ASM_LEVEL=$bng_asm_level" >> Makefile

# Determine if the POSIX threads library is supported

systhread_support=false

if test "$pthread_wanted" = "yes"; then
  case "$target" in
    *-*-solaris*)  pthread_link="-lpthread -lposix4"
                   pthread_caml_link="-cclib -lpthread -cclib -lposix4";;
    *-*-freebsd*)  pthread_link="-pthread"
                   pthread_caml_link="-cclib -pthread";;
    *-*-openbsd*)  pthread_link="-pthread"
                   pthread_caml_link="-cclib -pthread";;
    *)             pthread_link="-lpthread"
                   pthread_caml_link="-cclib -lpthread";;
  esac
  if ./hasgot -i pthread.h $pthread_link pthread_self; then
    inf "POSIX threads library supported."
    systhread_support=true
    otherlibraries="$otherlibraries systhreads"
    bytecccompopts="$bytecccompopts -D_REENTRANT"
    nativecccompopts="$nativecccompopts -D_REENTRANT"
    case "$target" in
      *-*-freebsd*)
          bytecccompopts="$bytecccompopts -D_THREAD_SAFE"
          nativecccompopts="$nativecccompopts -D_THREAD_SAFE";;
      *-*-openbsd*)
          bytecccompopts="$bytecccompopts -pthread"
          asppflags="$asppflags -pthread"
          nativecccompopts="$nativecccompopts -pthread";;
    esac
    inf "Options for linking with POSIX threads: $pthread_link"
    if sh ./hasgot $pthread_link sigwait; then
      inf "sigwait() found"
      echo "#define HAS_SIGWAIT" >> s.h
    fi
  else
    inf "POSIX threads not found."
    pthread_link=""
  fi
else
  pthread_link=""
fi
echo "PTHREAD_LINK=$pthread_caml_link" >> Makefile

# Determine if the bytecode thread library is supported

if test "$has_select" = "yes" \
&& test "$has_setitimer" = "yes" \
&& test "$has_gettimeofday" = "yes" \
&& test "$has_wait" = "yes"; then
  inf "Bytecode threads library supported."
  otherlibraries="$otherlibraries threads"
else
  inf "Bytecode threads library not supported (missing system calls)"
fi

# Determine the location of X include files and libraries

# If the user specified -x11include and/or -x11lib, these settings
# are used. Otherwise, we check whether there is pkg-config, and take
# the flags from there. Otherwise, we search the location.

x11_include="not found"
x11_link="not found"

if test -z "$x11_include_dir" -a -z "$x11_lib_dir"; then
  if pkg-config --exists x11 2>/dev/null; then
    x11_include=`pkg-config --cflags x11`
    x11_link=`pkg-config --libs x11`
  fi
fi

if test "$x11_include" = "not found"; then
  for dir in \
    $x11_include_dir          \
                              \
    /usr/X11R7/include        \
    /usr/include/X11R7        \
    /usr/local/X11R7/include  \
    /usr/local/include/X11R7  \
    /opt/X11R7/include        \
                              \
    /usr/X11R6/include        \
    /usr/include/X11R6        \
    /usr/local/X11R6/include  \
    /usr/local/include/X11R6  \
    /opt/X11R6/include        \
                              \
    /usr/X11/include          \
    /usr/include/X11          \
    /usr/local/X11/include    \
    /usr/local/include/X11    \
    /opt/X11/include          \
                              \
    /usr/X11R5/include        \
    /usr/include/X11R5        \
    /usr/local/X11R5/include  \
    /usr/local/include/X11R5  \
    /usr/local/x11r5/include  \
    /opt/X11R5/include        \
                              \
    /usr/X11R4/include        \
    /usr/include/X11R4        \
    /usr/local/X11R4/include  \
    /usr/local/include/X11R4  \
                              \
    /usr/X386/include         \
    /usr/x386/include         \
    /usr/XFree86/include/X11  \
                              \
    /usr/include              \
    /usr/local/include        \
    /usr/unsupported/include  \
    /usr/athena/include       \
    /usr/lpp/Xamples/include  \
                              \
    /usr/openwin/include      \
    /usr/openwin/share/include \
    ; \
    do
    if test -f $dir/X11/X.h; then
      x11_include_dir=$dir
      x11_include="-I$dir"
      break
    fi
  done

  if test "$x11_include" = "not found"; then
      x11_try_lib_dir=''
  else
      x11_try_lib_dir=`echo $x11_include_dir | sed -e 's|include|lib|'`
  fi

  for dir in \
    $x11_lib_dir          \
    $x11_try_lib_dir      \
                          \
    /usr/X11R6/lib64      \
    /usr/X11R6/lib        \
    /usr/lib/X11R6        \
    /usr/local/X11R6/lib  \
    /usr/local/lib/X11R6  \
    /opt/X11R6/lib        \
                          \
    /usr/X11/lib          \
    /usr/lib/X11          \
    /usr/local/X11/lib    \
    /usr/local/lib/X11    \
    /opt/X11/lib          \
                          \
    /usr/X11R5/lib        \
    /usr/lib/X11R5        \
    /usr/local/X11R5/lib  \
    /usr/local/lib/X11R5  \
    /usr/local/x11r5/lib  \
    /opt/X11R5/lib        \
                          \
    /usr/X11R4/lib        \
    /usr/lib/X11R4        \
    /usr/local/X11R4/lib  \
    /usr/local/lib/X11R4  \
                          \
    /usr/X386/lib         \
    /usr/x386/lib         \
    /usr/XFree86/lib/X11  \
                          \
    /usr/lib64            \
    /usr/lib              \
    /usr/local/lib        \
    /usr/unsupported/lib  \
    /usr/athena/lib       \
    /usr/lpp/Xamples/lib  \
    /lib/usr/lib/X11      \
                          \
    /usr/openwin/lib      \
    /usr/openwin/share/lib    \
                              \
    /usr/lib/i386-linux-gnu   \
    /usr/lib/x86_64-linux-gnu \
    ; \
    do
    if test -f $dir/libX11.a || \
       test -f $dir/libX11.so || \
       test -f $dir/libX11.dll.a || \
       test -f $dir/libX11.dylib || \
       test -f $dir/libX11.sa; then
      if test $dir = /usr/lib; then
        x11_link="-lX11"
      else
        x11_libs="-L$dir"
        case "$target" in
          *-kfreebsd*-gnu) x11_link="-L$dir -lX11";;
          *-*-*bsd*) x11_link="-R$dir -L$dir -lX11";;
          *) x11_link="-L$dir -lX11";;
        esac
      fi
      break
    fi
  done
fi

if test "x11_include" != "not found"; then
  if test "$x11_include" = "-I/usr/include"; then
    x11_include=""
  fi
  if ./hasgot $x11_include $x11_link -i X11/Xlib.h XrmInitialize; then
    inf "X11 works"
  else
    wrn "Cannot compile X11 program."
    x11_include="not found"
  fi
fi

has_graph=false
if test "$x11_include" = "not found" || test "$x11_link" = "not found"
then
  wrn 'X11 not found, the "graph" library will not be supported.'
  x11_include="not found"
  x11_link="not found"
else
  inf "Options for compiling for X11: $x11_include"
  inf "Options for linking with X11: $x11_link"
  if test "$graph_wanted" = yes
  then
    has_graph=true
    otherlibraries="$otherlibraries graph"
  fi
fi
echo "X11_INCLUDES=$x11_include" >> Makefile
echo "X11_LINK=$x11_link" >> Makefile

# Look for BFD library

if ./hasgot -i bfd.h && \
   ./hasgot -lbfd -ldl -liberty -lz bfd_openr; then
  inf "BFD library found."
  echo "#define HAS_LIBBFD" >> s.h
  echo "LIBBFD_LINK=-lbfd -ldl -liberty -lz" >> Makefile
else
  wrn "BFD library not found, 'objinfo' will be unable to display info on .cmxs files."
  echo "LIBBFD_LINK=" >> Makefile
fi

# Check whether assembler supports CFI directives

asm_cfi_supported=false

export as aspp

if ! $with_cfi; then
  echo "CFI support: disabled by command-line option -no-cfi"
elif sh ./tryassemble cfi.S; then
  echo "#define ASM_CFI_SUPPORTED" >> m.h
  asm_cfi_supported=true
  inf "Assembler supports CFI"
else
  inf "Assembler does not support CFI"
fi

if test "$with_frame_pointers" = "true"; then
  case "$target,$cc" in
    x86_64-*-linux*,gcc*)
       nativecccompopts="$nativecccompopts -g  -fno-omit-frame-pointer"
       bytecccompopts="$bytecccompopts -g  -fno-omit-frame-pointer"
       nativecclinkopts="$nativecclinkopts -g"
       echo "#define WITH_FRAME_POINTERS" >> m.h
       ;;
    *) err "Unsupported architecture with frame pointers";;
  esac

fi


# Final twiddling of compiler options to work around known bugs

nativeccprofopts="$nativecccompopts"
case "$buggycc" in
  gcc.2.96)
    bytecccompopts="$bytecccompopts -fomit-frame-pointer"
    nativecccompopts="$nativecccompopts -fomit-frame-pointer";;
esac

# Finish generated files

cclibs="$cclibs $mathlib"

echo "BYTECC=$bytecc" >> Makefile
echo "BYTECCCOMPOPTS=$bytecccompopts" >> Makefile
echo "BYTECCLINKOPTS=$bytecclinkopts" >> Makefile
echo "BYTECCLIBS=$cclibs $dllib $curseslibs $pthread_link" >> Makefile
echo "BYTECCRPATH=$byteccrpath" >> Makefile
echo "EXE=$exe" >> Makefile
echo "SUPPORTS_SHARED_LIBRARIES=$shared_libraries_supported" >> Makefile
echo "SHAREDCCCOMPOPTS=$sharedcccompopts" >> Makefile
echo "MKSHAREDLIBRPATH=$mksharedlibrpath" >> Makefile
echo "NATDYNLINKOPTS=$natdynlinkopts" >> Makefile
cat >> Makefile <<EOF
SYSLIB=-l\$(1)
#ml let syslib x = "-l"^x;;

### How to build a static library
MKLIB=ar rc \$(1) \$(2); ranlib \$(1)
#ml let mklib out files opts = Printf.sprintf "ar rc %s %s %s; ranlib %s" out opts files out;;
EOF
echo "ARCH=$arch" >> Makefile
echo "MODEL=$model" >> Makefile
echo "SYSTEM=$system" >> Makefile
echo "NATIVECC=$nativecc" >> Makefile
echo "NATIVECCCOMPOPTS=$nativecccompopts" >> Makefile
echo "NATIVECCPROFOPTS=$nativeccprofopts" >> Makefile
echo "NATIVECCLINKOPTS=$nativecclinkopts" >> Makefile
echo "NATIVECCRPATH=$nativeccrpath" >> Makefile
echo "NATIVECCLIBS=$cclibs $dllib" >> Makefile
echo "ASM=$as" >> Makefile
echo "ASPP=$aspp" >> Makefile
echo "ASPPPROFFLAGS=$asppprofflags" >> Makefile
echo "PROFILING=$profiling" >> Makefile
echo "DYNLINKOPTS=$dllib" >> Makefile
echo "OTHERLIBRARIES=$otherlibraries" >> Makefile
echo "CC_PROFILE=$cc_profile" >> Makefile
echo "SYSTHREAD_SUPPORT=$systhread_support" >> Makefile
echo "PARTIALLD=$partialld" >> Makefile
echo "PACKLD=\$(PARTIALLD) \$(NATIVECCLINKOPTS) -o " \
  | sed -e 's/ $/\\ /' >> Makefile
echo "DLLCCCOMPOPTS=$dllccompopts" >> Makefile
echo "IFLEXDIR=$iflexdir" >> Makefile
echo "O=o" >> Makefile
echo "A=a" >> Makefile
echo "SO=$SO" >> Makefile
echo "EXT_OBJ=.o" >> Makefile
echo "EXT_ASM=.s" >> Makefile
echo "EXT_LIB=.a" >> Makefile
echo "EXT_DLL=$SO" >> Makefile
echo "EXTRALIBS=" >> Makefile
echo "CCOMPTYPE=cc" >> Makefile
echo "TOOLCHAIN=$TOOLCHAIN" >> Makefile
echo "NATDYNLINK=$natdynlink" >> Makefile
echo "CMXS=$cmxs" >> Makefile
echo "MKEXE=$mkexe" >> Makefile
echo "MKEXEDEBUGFLAG=$mkexedebugflag" >> Makefile
echo "MKDLL=$mksharedlib" >> Makefile
echo "MKMAINDLL=$mkmaindll" >> Makefile
echo "RUNTIMED=${debugruntime}" >>Makefile
echo "WITH_CAMLP4=${with_camlp4}" >>Makefile
echo "WITH_DEBUGGER=${with_debugger}" >>Makefile
echo "WITH_OCAMLDOC=${with_ocamldoc}" >>Makefile
echo "WITH_OCAMLBUILD=${with_ocamlbuild}" >>Makefile
echo "ASM_CFI_SUPPORTED=$asm_cfi_supported" >> Makefile
echo "WITH_FRAME_POINTERS=$with_frame_pointers" >> Makefile
echo "TARGET=$target" >> Makefile
echo "HOST=$host" >> Makefile
if [ "$ostype" = Cygwin ]; then
  echo "DIFF=diff -q --strip-trailing-cr" >>Makefile
fi

cat >> Makefile << EOF
ROOTDIR=$rootdir
CAMLRUN=${camlrun}\$(EXE)
OCAMLRUN=\$(CAMLRUN)
CAMLC_BIN_BOOT   = \$(CAMLRUN) \$(ROOTDIR)/boot/ocamlc
CAMLC_BIN_BYTE   = \$(CAMLRUN) \$(ROOTDIR)/ocamlc
CAMLC_BIN_OPT    = \$(ROOTDIR)/ocamlc.opt
CAMLOPT_BIN_BYTE = \$(CAMLRUN) \$(ROOTDIR)/ocamlopt
CAMLOPT_BIN_OPT  = \$(ROOTDIR)/ocamlopt.opt

CAMLC_BIN   = @ . \$(ROOTDIR)/config/ocamlcomp; PS4=""; set -x; \$\${CAMLC_BIN}
CAMLOPT_BIN = @ . \$(ROOTDIR)/config/ocamlcomp; PS4=""; set -x; \$\${CAMLOPT_BIN}
CAMLC_BIN_CMD_TO_EVAL   = . \$(ROOTDIR)/config/ocamlcomp; echo \$\${CAMLC_BIN}
CAMLOPT_BIN_CMD_TO_EVAL = . \$(ROOTDIR)/config/ocamlcomp; echo \$\${CAMLOPT_BIN}
EOF

rm -f tst hasgot.c
rm -f ../m.h ../s.h ../Makefile
mv m.h s.h Makefile ..

rm -f ../ocamlcomp
cd .. && make -f Makefile.switch-compiler disable COMPILER="CAMLC" VARIANT="BYTE"

# Print a summary

inf
inf "** Configuration summary **"
inf
inf "Directories where OCaml will be installed:"
inf "        binaries.................. $bindir"
inf "        standard library.......... $libdir"
inf "        manual pages.............. $mandir (with extension .$manext)"

inf "Configuration for the bytecode compiler:"
inf "        C compiler used........... $bytecc"
inf "        options for compiling..... $bytecccompopts"
inf "        options for linking....... $bytecclinkopts $cclibs $dllib $curseslibs $pthread_link"
if $shared_libraries_supported; then
inf "        shared libraries are supported"
inf "        options for compiling..... $sharedcccompopts $bytecccompopts"
inf "        command for building...... $mksharedlib -o lib.so $mksharedlibrpath/a/path objs"
else
inf "        shared libraries not supported"
fi

inf "Configuration for the native-code compiler:"
if test "$arch" = "none"; then
  inf "        (not supported on this platform)"
else
  if test "$model" = "default"; then
    inf "        hardware architecture..... $arch"
  else
    inf "        hardware architecture..... $arch ($model)"
  fi
  if test "$system" = "unknown"; then : ; else
  inf "        OS variant................ $system"
  fi
  inf "        C compiler used........... $nativecc"
  inf "        options for compiling..... $nativecccompopts"
  inf "        options for linking....... $nativecclinkopts $cclibs"
  inf "        assembler ................ $as"
  inf "        preprocessed assembler ... $aspp"
  if test "$asm_cfi_supported" = "true"; then
  inf "        assembler supports CFI ... yes"
  else
  inf "        assembler supports CFI ... no"
  fi
  if test "$with_frame_pointers" = "true"; then
  inf "        with frame pointers....... yes"
  else
  inf "        with frame pointers....... no"
  fi
  echo "        native dynlink ........... $natdynlink"
  inf "        native dynlink ........... $natdynlink"
  if test "$profiling" = "prof"; then
  inf "        profiling with gprof ..... supported"
  else
  inf "        profiling with gprof ..... not supported"
  fi
fi

if test "$with_debugger" = "ocamldebugger"; then
  inf "Source-level replay debugger: supported"
else
  inf "Source-level replay debugger: not supported"
fi

if test "$debugruntime" = "runtimed"; then
  inf "Debug runtime will be compiled and installed"
fi

inf "Additional libraries supported:"
inf "        $otherlibraries"

inf "Configuration for the \"num\" library:"
inf "        target architecture ...... $bng_arch (asm level $bng_asm_level)"

if $has_graph; then
inf "Configuration for the \"graph\" library:"
inf "        options for compiling .... $x11_include"
inf "        options for linking ...... $x11_link"
else
inf "The \"graph\" library: not supported"
fi

inf
inf "** OCaml configuration completed successfully **"
inf

if test ! -z "$MACOSX_DEPLOYMENT_TARGET"; then
  wrn "The environment variable MACOSX_DEPLOYMENT_TARGET is set.\n" \
      "This will probably prevent compiling the OCaml system."
fi