#!/bin/sh

if [ ! -f libltrace.c ]
then
  echo "configure: error: cannot find sources (libltrace.c)" 1>&2
  exit 1
fi

echo -n "checking package name... "
PACKAGE_NAME='ltrace'
echo $PACKAGE_NAME

echo -n "checking $PACKAGE_NAME version... "
PACKAGE_VERSION=$( cat VERSION )
echo $PACKAGE_VERSION

echo -n "checking HOST_OS... "
HOST_OS=$( uname -s )
if [ "$HOST_OS" = "Linux" ]
then
  HOST_OS="linux-gnu"
fi
echo $HOST_OS

# HAVE_LIBIBERTY
echo -n "checking for cplus_demangle in -liberty... "
cat > conftest.c << EOF
char cplus_demangle();
int main () {
  return cplus_demangle();
}
EOF
if gcc conftest.c -liberty 2>/dev/null
then
  HAVE_LIBIBERTY=1
  echo "yes"
else
  unset HAVE_LIBIBERTY
  echo "no"
fi
rm -f conftest.c a.out

# HAVE_LIBSUPC__
echo -n "checking for __cxa_demangle in -lsupc++... "
cat > conftest.c << EOF
char __cxa_demangle();
int main () {
  return __cxa_demangle();
}
EOF
if gcc conftest.c -lsupc++ 2>/dev/null
then
  HAVE_LIBSUPC__=1
  echo "yes"
else
  unset HAVE_LIBSUPC__
  echo "no"
fi
rm -f conftest.c a.out

# HAVE_ELF_C_READ_MMAP
echo -n "checking whether elf_begin accepts ELF_C_READ_MMAP... "
cat > conftest.c << EOF
#include <gelf.h>
int main () {
  Elf *elf = elf_begin (4, ELF_C_READ_MMAP, 0);
  return 0;
}
EOF
if gcc conftest.c 2>/dev/null
then
  HAVE_ELF_C_READ_MMAP=1
  echo "yes"
else
  unset HAVE_ELF_C_READ_MMAP
  echo "no"
fi
rm -f conftest.c a.out

CC=gcc
CPPFLAGS=' -I /usr/include/libelf'
CFLAGS='-g -O2'
LIBS='-lelf -lsupc++ -liberty '
INSTALL='/usr/bin/install -c'
iquote='-iquote '
iquoteend=''

prefix=/usr/local
sysconfdir='${prefix}/etc'
bindir='${prefix}/bin'
mandir='${prefix}/share/man'
docdir='${prefix}/share/doc/ltrace'
for x_option
do
  if test -n "$x_prev"; then
    eval $x_prev=\$x_option
    x_prev=
    continue
  fi
  case $x_option in
    --*=* | *=*)
      x_var=`echo $x_option | sed 's/^--//' | sed 's/=.*//'`
      x_val=`echo $x_option | sed 's/^.*=//'`
      eval $x_var=$x_val
      ;;
    --*)
      x_prev=`echo $x_option | sed 's/^--//'`
      ;;
  esac
done

echo "configure: creating Makefile"
#
# Makefile.in -> Makefile
#
x_subst_vars='PACKAGE_VERSION HOST_OS INSTALL CC CPPFLAGS CFLAGS LDFLAGS LIBS iquote iquoteend prefix sysconfdir mandir docdir'

for i in $x_subst_vars
do
  x_val=`eval echo \\"\\$$i\\"`
  x_sed="$x_sed
s&@$i@&$x_val&g"
done

sed "$x_sed" Makefile.in > Makefile

echo "configure: creating config.h"
#
# config.h
#
exec > config.h

echo '#define PACKAGE_NAME "ltrace"'
echo '#define PACKAGE_VERSION "'$PACKAGE_VERSION'"'

if [ "$HAVE_LIBIBERTY" ]
then
  echo '#define HAVE_LIBIBERTY 1'
else
  echo '#undef HAVE_LIBIBERTY'
fi

if [ "$HAVE_LIBSUPC__" ]
then
  echo '#define HAVE_LIBSUPC__ 1'
else
  echo '#undef HAVE_LIBSUPC__'
fi

if [ "$HAVE_ELF_C_READ_MMAP" ]
then
  echo '#define HAVE_ELF_C_READ_MMAP 1'
else
  echo '#undef HAVE_ELF_C_READ_MMAP'
fi

exit 0