#!/bin/sh

#######################################################################
#                                                                     #
#              The Compcert verified compiler                         #
#                                                                     #
#          Xavier Leroy, INRIA Paris-Rocquencourt                     #
#                                                                     #
#  Copyright Institut National de Recherche en Informatique et en     #
#  Automatique.  All rights reserved.  This file is distributed       #
#  under the terms of the INRIA Non-Commercial License Agreement.     #
#                                                                     #
#######################################################################

prefix=/usr/local
bindir='$(PREFIX)/bin'
libdir='$(PREFIX)/lib/compcert'
toolprefix=''
target=''

usage='Usage: ./configure [options] target

Supported targets:
  ppc-linux        (PowerPC, Linux)
  ppc-eabi         (PowerPC, EABI with GNU/Unix tools)
  ppc-eabi-diab    (PowerPC, EABI with Diab tools)
  arm-linux        (ARM, EABI)
  arm-eabi         (ARM, EABI)
  ia32-linux       (x86 32 bits, Linux)
  ia32-bsd         (x86 32 bits, BSD)
  ia32-macosx      (x86 32 bits, MacOS X)
  ia32-cygwin      (x86 32 bits, Cygwin environment under Windows)
  manual           (edit configuration file by hand)

Options:
  -prefix <dir>    Install in <dir>/bin and <dir>/lib/compcert
  -bindir <dir>    Install binaries in <dir>
  -libdir <dir>    Install libraries in <dir>
  -toolprefix <pref>  Prefix names of tools ("gcc", etc) with <pref>
'

# Parse command-line arguments

while : ; do
  case "$1" in
    "") break;;
    -prefix|--prefix)
        prefix="$2"; shift;;
    -bindir|--bindir)
        bindir="$2"; shift;;
    -libdir|--libdir)
        libdir="$2"; shift;;
    -toolprefix|--toolprefix)
        toolprefix="$2"; shift;;
    *)
        if test -n "$target"; then echo "$usage" 1>&2; exit 2; fi
        target="$1";;
  esac
  shift
done

# Per-target configuration

cchecklink=false
has_runtime_lib=true
casmruntime=""
asm_supports_cfi=""

case "$target" in
  powerpc-linux|ppc-linux|powerpc-eabi|ppc-eabi)
    arch="powerpc"
    variant="eabi"
    system="linux"
    cc="${toolprefix}gcc"
    cprepro="${toolprefix}gcc -U__GNUC__ -E"
    casm="${toolprefix}gcc -c"
    casmruntime="${toolprefix}gcc -c -Wa,-mregnames"
    clinker="${toolprefix}gcc"
    libmath="-lm"
    cchecklink=true;;
  powerpc-eabi-diab|ppc-eabi-diab)
    arch="powerpc"
    variant="eabi"
    system="diab"
    cc="${toolprefix}dcc"
    cprepro="${toolprefix}dcc -E"
    casm="${toolprefix}das"
    asm_supports_cfi=false
    clinker="${toolprefix}dcc"
    libmath="-lm"
    cchecklink=true;;
  arm-linux|arm-eabi)
    arch="arm"
    variant="eabi"
    system="linux"
    cc="${toolprefix}gcc"
    cprepro="${toolprefix}gcc -U__GNUC__ '-D__REDIRECT(name,proto,alias)=name proto' '-D__REDIRECT_NTH(name,proto,alias)=name proto' -E"
    casm="${toolprefix}gcc -c"
    clinker="${toolprefix}gcc"
    libmath="-lm";;
  ia32-linux)
    arch="ia32"
    variant="standard"
    system="linux"
    cc="${toolprefix}gcc -m32"
    cprepro="${toolprefix}gcc -m32 -U__GNUC__ -E"
    casm="${toolprefix}gcc -m32 -c"
    clinker="${toolprefix}gcc -m32"
    libmath="-lm";;
  ia32-bsd)
    arch="ia32"
    variant="standard"
    system="bsd"
    cc="${toolprefix}gcc -m32"
    cprepro="${toolprefix}gcc -m32 -U__GNUC__ -E"
    casm="${toolprefix}gcc -m32 -c"
    clinker="${toolprefix}gcc -m32"
    libmath="-lm";;
  ia32-macosx)
    arch="ia32"
    variant="standard"
    system="macosx"
    cc="${toolprefix}gcc -arch i386"
    cprepro="${toolprefix}gcc -arch i386 -U__GNUC__ -U__BLOCKS__ -E"
    casm="${toolprefix}gcc -arch i386 -c"
    case `uname -r` in
      [1-9].*|10.*|11.*)    # up to MacOS 10.7 included
        clinker="${toolprefix}gcc -arch i386";;
      *)                    # MacOS 10.8 and up
        clinker="${toolprefix}gcc -arch i386 -Wl,-no-pie";;
    esac
    libmath="";;
  ia32-cygwin)
    arch="ia32"
    variant="standard"
    system="cygwin"
    cc="${toolprefix}gcc -m32"
    cprepro="${toolprefix}gcc -m32 -U__GNUC__ -E"
    casm="${toolprefix}gcc -m32 -c"
    clinker="${toolprefix}gcc -m32"
    libmath="-lm";;
  manual)
    ;;
  "")
    echo "No target specified." 1>&2
    echo "$usage" 1>&2
    exit 2;;
  *)
    echo "Unknown target '$target'." 1>&2
    echo "$usage" 1>&2
    exit 2;;
esac

if test -z "$casmruntime"; then casmruntime="$casm"; fi

# Test assembler support for CFI directives

if test "$target" != "manual" && test -z "$asm_supports_cfi"; then
  echo "Testing assembler support for CFI directives... " | tr -d '\n'
  f=/tmp/compcert-configure-$$.s
  rm -f $f
  cat >> $f <<EOF
testfun:
	.file 1 "testfun.c"
	.loc 1 1
	.cfi_startproc
	.cfi_adjust_cfa_offset 16
	.cfi_endproc
EOF
  if $casm -o /dev/null $f 2>/dev/null
  then echo "yes"; asm_supports_cfi=true
  else echo "no";  asm_supports_cfi=false
  fi
  rm -f $f
fi

# Additional packages needed for cchecklink

if $cchecklink; then
  echo "Testing availability of ocaml-bitstring... " | tr -d '\n'
  if ocamlfind query bitstring > /dev/null
  then
    echo "yes"
  else 
    echo "no"
    echo "ocamlfind or ocaml-bitstring missing, cchecklink will not be built"
    cchecklink=false
  fi
fi

# Generate Makefile.config

rm -f Makefile.config
cat > Makefile.config <<EOF
PREFIX=$prefix
BINDIR=$bindir
LIBDIR=$libdir
EOF

if test "$target" != "manual"; then
cat >> Makefile.config <<EOF
ARCH=$arch
VARIANT=$variant
SYSTEM=$system
CC=$cc
CPREPRO=$cprepro
CASM=$casm
CASMRUNTIME=$casmruntime
CLINKER=$clinker
LIBMATH=$libmath
HAS_RUNTIME_LIB=$has_runtime_lib
CCHECKLINK=$cchecklink
ASM_SUPPORTS_CFI=$asm_supports_cfi
EOF
else
cat >> Makefile.config <<'EOF'

# Target architecture
# ARCH=powerpc
# ARCH=arm
# ARCH=ia32
ARCH=

# Target ABI
# VARIANT=eabi     # for PowerPC / Linux and other SVR4 or EABI platforms
# VARIANT=linux    # for ARM
# VARIANT=standard # for IA32
VARIANT=

# Target operating system and development environment
# Possible choices for PowerPC:
# SYSTEM=macosx
# SYSTEM=linux
# SYSTEM=diab
# Possible choices for ARM:
# SYSTEM=linux
# Possible choices for IA32:
# SYSTEM=linux
# SYSTEM=bsd
# SYSTEM=macosx
# SYSTEM=cygwin
SYSTEM=

# C compiler for compiling runtime library files and some tests
CC=gcc

# Preprocessor for .c files
CPREPRO=gcc -U__GNUC__ -E

# Assembler for assembling .s files
CASM=gcc -c

# Assembler for assembling runtime library files
CASMRUNTIME=gcc -c

# Linker
CLINKER=gcc

# Math library.  Set to empty under MacOS X
LIBMATH=-lm

# Do not change
HAS_RUNTIME_LIB=true

# Whether the assembler $(CASM) supports .cfi debug directives
ASM_SUPPORTS_CFI=false
#ASM_SUPPORTS_CFI=true

EOF

fi

# Summarize configuration

if test "$target" = "manual"; then
cat <<EOF

Please finish the configuration by editing file ./Makefile.config.

EOF

else

bindirexp=`echo "$bindir" | sed -e "s|\\\$(PREFIX)|$prefix|"`
libdirexp=`echo "$libdir" | sed -e "s|\\\$(PREFIX)|$prefix|"`

cat <<EOF

CompCert configuration:
    Target architecture........... $arch
    Application binary interface.. $variant
    OS and development env........ $system
    C compiler.................... $cc
    C preprocessor................ $cprepro
    Assembler..................... $casm
    Assembler supports CFI........ $asm_supports_cfi
    Assembler for runtime lib..... $casmruntime
    Linker........................ $clinker
    Math library.................. $libmath
    Binaries installed in......... $bindirexp
    Runtime library provided...... $has_runtime_lib
    Library files installed in.... $libdirexp
    cchecklink tool supported..... $cchecklink

If anything above looks wrong, please edit file ./Makefile.config to correct.

EOF

fi