#!/bin/sh
#
# Configure script for GHDL (C) 2014-2018 Tristan Gingold
#
# This program 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 of the License, or
# (at your option) any later version.
#
# This program 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 this program.  If not, see <gnu.org/licenses>.


# Current version.  This is the only place where the version is written.
# Any code that needs version should read it directly or indirectly from this
# place.
# Note the absence of spaces and the quotes.
# Suffix "-dev" is used during development.
ghdl_version="4.0.0-dev"

backend=mcode
backend_version="none"
CC=${CC:-gcc}
CXX=${CXX:-clang++}
CFLAGS=${CFLAGS:--g}
CXXFLAGS=${CXXFLAGS:--g}
GNATMAKE=${GNATMAKE:-gnatmake}
ADA_FLAGS=${ADA_FLAGS:-}
MAKE=${MAKE:-make}
LDFLAGS=${LDFLAGS:-}
prefix=/usr/local
libdirsuffix=lib
libghdldirsuffix=lib/ghdl
incdirsuffix=include
gcc_src_dir=
llvm_config=
backtrace_lib=
llvm_be=llvm6
build=
build_mode=
enable_werror=false
enable_checks=true
enable_gplcompat=unknown
enable_libghdl=true
enable_synth=true
with_readline=None
with_sundials=false
sundials_incflags=
sundials_ldflags=
default_pic=false
EXEEXT=
SOEXT=.so
PIC_FLAGS=-fPIC

show_help=no
progname=$0

subst_vars="CC CXX GNATMAKE ADA_FLAGS MAKE CFLAGS CXXFLAGS LDFLAGS build
srcdir abs_srcdir prefix backend backend_version libdirsuffix libghdldirsuffix
incdirsuffix gcc_src_dir llvm_config llvm_be backtrace_lib
build_mode EXEEXT SOEXT PIC_FLAGS default_pic enable_werror enable_checks
enable_gplcompat enable_libghdl libghdl_version ghdl_version
with_sundials sundials_incflags sundials_ldflags
COMPILER_GCC COMPILER_DEBUG COMPILER_MCODE COMPILER_LLVM POST_PROCESSOR
INSTALL_PREFIX LIBDIR_SUFFIX LIBGHDLDIR_SUFFIX INCDIR_SUFFIX
"

# Find srcdir
srcdir=`dirname $progname`
if test x$srcdir = x; then
  srcdir=.
fi

# Check echo -n / echo \c
if test x`echo -n` = x"-n" ; then
  echon=
  echoc="\c"
else
  echon="-n"
  echoc=
fi

# Check $1 is a prefix of $2
check_version()
{
  exp_ver=`echo $1 | sed 's/\./v/g'`
  tool_ver=`echo $2 | sed 's/\./v/g'`
  if echo $tool_ver | grep -q "^$exp_ver"; then
    return 0
  else
    return 1
  fi
}

# Decode options
for opt do
  optarg=`expr x"$opt" : 'x[^=]*=\(.*\)'`
  case "$opt" in
    CC=*|CFLAGS=*|GNATMAKE=*|LDFLAGS=*|CXX=*)
      optvar=`expr x"$opt" : 'x\([^=]*\)=.*'`
      eval $optvar=\"$optarg\"
      ;;
    --prefix=*)             prefix="$optarg";;
    --srcdir=*)             srcdir="$optarg";;
    --libdir=*)             libdirsuffix="$optarg";;
    --libghdldir=*)         libghdldirsuffix="$optarg";;
    --incdir=*)             incdirsuffix="$optarg";;
    --with-gcc=*)           gcc_src_dir="$optarg";     backend=gcc;;
    --with-llvm=*)
      echo "--with-llvm is deprecated, use --with-llvm-config"
      llvm_config="$optarg/bin/llvm-config";           backend=llvm;;
    --with-llvm-config)     llvm_config="llvm-config"; backend=llvm;;
    --with-llvm-config=*)   llvm_config="$optarg";     backend=llvm;;
    --with-backtrace-lib=*) backtrace_lib="$optarg";;
    --with-readline)        with_readline="Gnu";;
    --with-sundials=*)      with_sundials=true;
			    sundials_incflags="-I$optarg/include";
			    sundials_ldflags="-L$optarg/lib -lsundials_ida";;
    --with-sundials)        with_sundials=true;;
    --enable-werror)        enable_werror=true;;
    --disable-werror)       enable_werror=false;;
    --enable-checks)        enable_checks=true;;
    --disable-checks)       enable_checks=false;;
    --enable-gplcompat)     enable_gplcompat=true;;
    --disable-gplcompat)    enable_gplcompat=false;;
    --enable-libghdl)       enable_libghdl=true;;
    --disable-libghdl)      enable_libghdl=false;;
    --enable-synth)         enable_synth=true;;
    --disable-synth)        enable_synth=false;;
    --default-pic)          default_pic=true;;
    --enable-coverage)      build_mode="coverage";;
    -h|-help|--help)        show_help=yes;;
    *)
      echo "$0: unknown option $opt; try $0 --help"
      exit 1
      ;;
  esac
done

# Help
if test $show_help != no; then
  cat <<EOF
Usage: configure [options]

Options [defaults in brackets]:
  --prefix=PREFIX             install in PREFIX [$prefix]
  --srcdir=SRCDIR             source code path [$srcdir]
  --libdir=LIBDIR             lib dir path relative to PREFIX [$libdirsuffix]
  --libghdldir=LIBGHDLDIR     ghdl lib dir path relative to PREFIX [$libdirsuffix]
  --incdir=INCDIR             C include dir path relative to PREFIX [$incdirsuffix]
  --with-gcc=DIR              use gcc backend from DIR
  --with-llvm-config[=LLVM-CONFIG]  use llvm backend [llvm-config]
  --with-backtrace-lib=LIB.a  link with libbacktrace LIB.a to display a
                              backtrace on errors (only for llvm).
  --disable-werror            warnings don't stop build
  --disable-checks            disable internal checks
  --disable-libghdl           do not build libghdl shared library
  --enable-gplcompat          use GPL-compatible sources for ieee library
  --enable-libghdl            also build the libghdl shared library
  --disable-synth             do not build with synthesis feature

Binaries are installed in PREFIX/bin
Shared libraries are installed in PREFIX/LIBDIRSUFFIX
C header files are installed in PREFIX/INCDIR
GHDL libraries are installed in PREFIX/LIBGHDLDIR
EOF
  exit 0
fi

# Set abs_srcdir (absolute srcdir)
case $srcdir in
  /*) abs_srcdir=$srcdir;;
  *)
    # Use a Windows path on windows.
    case "$OS" in
      Windows_NT) curdir=`pwd -W 2>/dev/null || pwd` ;;
      *) curdir=`pwd` ;;
    esac
    abs_srcdir=$curdir/$srcdir
    ;;
esac

# Sanity checks
# Check srcdir
pat="2019802090ed76fc5c54cec58f22a2c1"
if ! grep $pat $srcdir/configure > /dev/null 2>&1; then
  echo "Incorrect srcdir; try with --srcdir=xx"
  echo "srcdir=$srcdir"
  exit 1
fi

if ! `cmp /dev/null /dev/null > /dev/null 2>&1`; then
  echo "Sorry, you need 'cmp' to configure GHDL.";
  exit 1
fi

if ! cmp $srcdir/configure $abs_srcdir/configure > /dev/null 2>&1; then
  echo "Cannot compute absolute source dir (or incorrect srcdir)"
  echo "srcdir=$srcdir"
  echo "abs_srcdir=$abs_srcdir"
  exit 1
fi
# Check that gnatmake exists
if ! $GNATMAKE --version >/dev/null 2>&1; then
  echo "Sorry, you need GNAT to build GHDL.  See the README"
  echo "(gnatmake executable is: $GNATMAKE)"
  exit 1
fi

# Check that compiler exists
if ! $CC --version 2> /dev/null; then
  echo "Sorry, you need a C compiler to build GHDL.  See the README"
  exit 1
fi

# Check the version of libghdl is correct.
if [ "$enable_libghdl" = true ]; then
    libghdl_version="$srcdir/pyGHDL/__init__.py"
    # Extract content between double quotes in __init__.py, to avoid false positives due to LF/CRLF mismatch.
    if [ "$ghdl_version" != `sed -n 's/^__version__.*"\(.*\)".*/\1/gp' $libghdl_version` ]; then
      echo "Sorry, the version of $libghdl_version is not correct"
      echo "update the version to: $ghdl_version"
      echo "or use --disable-libghdl"
      exit 1
    fi
fi

# Default for enable_gplcompat
if [ "$enable_gplcompat" = "unknown" ]; then
  if test -d $srcdir/libraries/vital95 && test -d $srcdir/libraries/vital2000; then
    enable_gplcompat=false
    echo "Use full IEEE library"
  else
    enable_gplcompat=true
    echo "Use GPL-compatible source files for IEEE library (but partial)"
  fi
elif [ "$enable_gplcompat" = false ]; then
  if ! test -d $srcdir/libraries/vital95 || ! test -d $srcdir/libraries/vital2000; then
    echo "Sorry, full IEEE library source files not present"
    echo "consider --enable-gplcompat"
    exit 1
  fi
fi

# Compute build machine
if test x$build = x; then
  build=`$CC $CFLAGS -dumpmachine`
fi
echo "Build machine is: $build"

# For mcode, check that gcc emits i386
if test $backend = mcode; then
  case "$build" in
    i[3-6]86*) mcode64="" ;;
    x86_64*) mcode64="64" ;;
    amd64*)  mcode64="64" ;;
    *)
      mcode64=""
      echo "WARNING: GHDL for mcode is supported only on x86"
      echo "continuing, but build failure expected (See the README)"
      ;;
  esac
  if test "x$backtrace_lib" != x ; then
    echo "WARNING: --with-backtrace-lib= ignored with mcode"
    backtrace_lib=
  fi
  backend_version="none"
fi

# For gcc backend, check existing version
if test $backend = gcc; then
  if ! test -f $gcc_src_dir/gcc/BASE-VER; then
    echo "cannot find gcc/BASE-VER in $gcc_src_dir"
    exit 1
  fi
  backend_version=`cat $gcc_src_dir/gcc/BASE-VER`
  if test "x$backtrace_lib" = x ; then
    # Automatically use libbacktrace from gcc.
    backtrace_lib="$prefix/$libghdldirsuffix/libbacktrace.a"
  fi
fi

# For llvm backend, check llvm-config
if test $backend = llvm; then
  # No quotes for llvm_config, so that options (like --link-static) can be
  # added.  As a consequence, spaces in --with-llvm-config= are not allowed
  # for the path.
  llvm_version=`$llvm_config --version 2>/dev/null`
  if [ $? != 0 ]; then
    echo "cannot run $llvm_config"
    exit 1
  fi
  if   check_version  3.5 $llvm_version ||
       check_version  3.6 $llvm_version ||
       check_version  3.7 $llvm_version ||
       check_version  3.8 $llvm_version ||
       check_version  3.9 $llvm_version ||
       check_version  4.0 $llvm_version ||
       check_version  5.0 $llvm_version ||
       false; then
    echo "Debugging not enabled with llvm $llvm_version"
  elif check_version  6.0 $llvm_version ||
       check_version  7.0 $llvm_version ||
       check_version  8.0 $llvm_version ||
       check_version  9.0 $llvm_version ||
       check_version 10.0 $llvm_version ||
       check_version 11.0 $llvm_version ||
       check_version 11.1 $llvm_version ||
       check_version 12.0 $llvm_version ||
       check_version 13.0 $llvm_version ||
       check_version 14.0 $llvm_version ||
       check_version 15.0 $llvm_version ||
       check_version 16.0 $llvm_version ||
       false; then
    echo "Debugging is enabled with llvm $llvm_version"
  else
    echo "Unhandled version llvm $llvm_version"
    exit 1
  fi
  # For llvm, the c++ compiler is used for linking so that the standard c++
  # library is included.  However, the linker needs the no_compact_unwind
  # flag because code generated by gcc is not compatible with compact unwind.
  case "$build" in
    *darwin*) LDFLAGS="$LDFLAGS -Wl,-no_compact_unwind" ;;
  esac
  backend_version="$llvm_version"
fi

# Define default file extensions for Windows or Linux-like systems and
# use -fPIC or not.
case "$build" in
  *mingw* | *cygwin* | *windows-gnu*) SOEXT=".dll";   EXEEXT=".exe"; PIC_FLAGS="";;
  *darwin*)           SOEXT=".dylib"; EXEEXT="";     PIC_FLAGS="";;
  *)                  SOEXT=".so";    EXEEXT="";     PIC_FLAGS="-fPIC";;
esac

# Define libghdl_version
libghdl_version=`echo $ghdl_version | sed -e 's/[-.]/_/g'`

# Check if gcc was configured with --enable-default-pie.  In that case -fPIC
# should be added.
if gcc -v 2>&1 | grep -q enable-default-pie; then
  default_pic="true"
fi

# Create subdirectories
if [ ! -d pic ]; then
  echo "create pic/ subdirectory"
  if ! mkdir pic; then
    echo "failed to create pic/"
    exit 1;
  fi
fi

# Define variables derrived from configuration
#
# Note most of these are used to generate default_paths.ads, you should
# also update scripts/windows/mcode/default_paths.ads if you change them.
COMPILER_GCC=ghdl1-gcc$EXEEXT
COMPILER_DEBUG=ghdl1-debug$EXEEXT
COMPILER_MCODE=ghdl1-mcode$EXEEXT
COMPILER_LLVM=ghdl1-llvm$EXEEXT
POST_PROCESSOR=oread-$backend
INSTALL_PREFIX=$prefix
LIBDIR_SUFFIX=$libdirsuffix
LIBGHDLDIR_SUFFIX=$libghdldirsuffix
INCDIR_SUFFIX=$incdirsuffix

# Generate config.status
rm -f config.status
{
  echo "#! /bin/sh"
  echo "# Generated by configure."
  echo "# Run this file to recreate the current configuration."
  echo
  echo 'if [ x"$1" = x"--reconfigure" ]; then'
  #  Do not use exec as bash 3.2 pass the absolute path in argv[0]
  echo $echon "   $progname"$echoc
  for opt do
    echo $echon \ \"$opt\"$echoc
  done
  echo
  echo "  exit"
  echo 'fi'
  echo
  echo subst_vars=\"$subst_vars\"
  for v in $subst_vars; do
    eval vval=\$$v
    echo $v=\"$vval\"
  done
  subst_files="Makefile default_paths.ads ghdl.gpr scripts/gcc/Make-lang.in"
  echo "for f in $subst_files; do"
  echo '  echo "Creating $f"'
  echo '  mkdir -p "$(dirname "$f")"'
  echo "  sed \\"
  for v in $subst_vars; do
      echo "    -e \"s%@$v@%\$$v%g\" \\"
  done
  echo '  < $srcdir/${f}.in > $f'
  echo "done"
} > config.status || \
{
  echo "$progname: cannot create config.status"
  exit 1
}

chmod +x ./config.status

# Run config.status to generate files
if ! sh ./config.status; then
  echo "$progname: cannot execute config.status"
  exit 1
fi

# Create dirs
if ! $MAKE create-dirs; then
    echo "$progname: cannot execute $MAKE create-dirs"
    exit 1
fi

# Generate ortho_code-x86-flags
if test $backend = mcode; then
  case "$build" in
    *darwin*)  ortho_flags="Flags_Macosx${mcode64}" ;;
    *mingw32*) ortho_flags="Flags_Windows${mcode64}" ;;
    *linux*)   ortho_flags="Flags_Linux${mcode64}" ;;
    *openbsd*) ortho_flags="Flags_Macosx${mcode64}" ;;
    *) echo "Unsupported $build build for mcode"; exit 1;;
  esac
  echo "Generate ortho_code-x86-flags.ads"
  {
    echo "with Ortho_Code.X86.$ortho_flags;"
    echo "package Ortho_Code.X86.Flags renames Ortho_Code.X86.$ortho_flags;"
  } > ortho_code-x86-flags.ads
  echo "Generate elf_arch.ads"
  {
    echo "with Elf_Arch${mcode64:-32};"
    echo "package Elf_Arch renames Elf_Arch${mcode64:-32};"
  } > elf_arch.ads
fi

# Generate ghdlsynth_maybe.ads
echo "Generate ghdlsynth_maybe.ads"
if [ "$enable_synth" = "true" ]; then
    pkg_synth=Ghdlsynth
else
    pkg_synth=Ghdlnull
fi
echo "with $pkg_synth;" > ghdlsynth_maybe.ads
echo "package Ghdlsynth_Maybe renames $pkg_synth;" >> ghdlsynth_maybe.ads

# Generate grt-readline.ads
echo "Generate grt-readline.ads"
echo "with Grt.Readline_${with_readline};" > grt-readline.ads
echo "package Grt.Readline renames Grt.Readline_${with_readline};" >> grt-readline.ads

exit 0