dnl @synopsis AM_WITH_MPATROL(DEFAULT)
dnl
dnl Integrates the mpatrol malloc debugging library into a new or
dnl existing project and also attempts to determine the support
dnl libraries that need to be linked in when libmpatrol is used.
dnl
dnl It takes one optional parameter specifying whether mpatrol should
dnl be included in the project (`yes') or not (`no').  This can also be
dnl specified as `threads' if you wish to use the threadsafe version of
dnl the mpatrol library.  You can override the value of the optional
dnl parameter with the `--with-mpatrol' option to the resulting
dnl `configure' shell script.
dnl
dnl @version $Id: am_with_mpatrol.m4,v 1.1 2001/07/26 02:07 ac-archive-0.5.39 $
dnl @author Graeme S. Roy <graeme@epc.co.uk>
dnl
AC_DEFUN(AM_WITH_MPATROL, [
  # Firstly, determine if the mpatrol library should be used.

  AC_MSG_CHECKING(if mpatrol should be used)
  AC_ARG_WITH(mpatrol,
   [  --with-mpatrol          build with the mpatrol library],
   [case "$withval" in
     threads)
      am_with_mpatrol=1
      am_with_mpatrol_threads=1;;
     yes)
      am_with_mpatrol=1
      am_with_mpatrol_threads=0;;
     no)
      am_with_mpatrol=0
      am_with_mpatrol_threads=0;;
     *)
      AC_MSG_RESULT(no)
      AC_MSG_ERROR(invalid value $withval for --with-mpatrol);;
    esac
   ],
   [if test "x[$1]" = x
    then
     am_with_mpatrol=0
     am_with_mpatrol_threads=0
    elif test "[$1]" = no
    then
     am_with_mpatrol=0
     am_with_mpatrol_threads=0
    elif test "[$1]" = yes
    then
     am_with_mpatrol=1
     am_with_mpatrol_threads=0
    elif test "[$1]" = threads
    then
     am_with_mpatrol=1
     am_with_mpatrol_threads=1
    else
     AC_MSG_RESULT(no)
     AC_MSG_ERROR(invalid argument [$1])
    fi
   ]
  )

  if test "$am_with_mpatrol" = 1
  then
   AC_MSG_RESULT(yes)

   # Next, determine which support libraries are available on this
   # system.  If we don't do this here then we can't link later with
   # the mpatrol library to perform any further tests.

   am_with_mpatrol_libs=""
   AC_CHECK_LIB(ld, ldopen,
                am_with_mpatrol_libs="$am_with_mpatrol_libs -lld")
   AC_CHECK_LIB(elf, elf_begin,
                am_with_mpatrol_libs="$am_with_mpatrol_libs -lelf")
   AC_CHECK_LIB(bfd, bfd_init,
                am_with_mpatrol_libs="$am_with_mpatrol_libs -lbfd -liberty", ,
                -liberty)
   AC_CHECK_LIB(imagehlp, SymInitialize,
                am_with_mpatrol_libs="$am_with_mpatrol_libs -limagehlp")
   AC_CHECK_LIB(cl, U_get_previous_frame,
                am_with_mpatrol_libs="$am_with_mpatrol_libs -lcl")
   AC_CHECK_LIB(exc, unwind,
                am_with_mpatrol_libs="$am_with_mpatrol_libs -lexc")

   # Now determine which libraries really need to be linked in with
   # the version of libmpatrol that is on this system.  For example,
   # if the system has libelf and libbfd, we need to determine which
   # of these, if any, libmpatrol was built with support for.

   am_with_mpatrol_libs2=""
   AC_CHECK_LIB(mpatrol, __mp_libld,
                am_with_mpatrol_libs2="$am_with_mpatrol_libs2 -lld", ,
                $am_with_mpatrol_libs)
   AC_CHECK_LIB(mpatrol, __mp_libelf,
                am_with_mpatrol_libs2="$am_with_mpatrol_libs2 -lelf", ,
                $am_with_mpatrol_libs)
   AC_CHECK_LIB(mpatrol, __mp_libbfd,
                am_with_mpatrol_libs2="$am_with_mpatrol_libs2 -lbfd -liberty", ,
                $am_with_mpatrol_libs)
   AC_CHECK_LIB(mpatrol, __mp_libimagehlp,
                am_with_mpatrol_libs2="$am_with_mpatrol_libs2 -limagehlp", ,
                $am_with_mpatrol_libs)
   AC_CHECK_LIB(mpatrol, __mp_libcl,
                am_with_mpatrol_libs2="$am_with_mpatrol_libs2 -lcl", ,
                $am_with_mpatrol_libs)
   AC_CHECK_LIB(mpatrol, __mp_libexc,
                am_with_mpatrol_libs2="$am_with_mpatrol_libs2 -lexc", ,
                $am_with_mpatrol_libs)

   # If we are using the threadsafe mpatrol library then we may also need
   # to link in the threads library.  We check blindly for pthreads here
   # even if we don't need them (in which case it doesn't matter) since
   # the threads libraries are linked in by default on AmigaOS, Windows
   # and Netware and it is only UNIX systems that we need to worry about.

   if test "$am_with_mpatrol_threads" = 1
   then
    AC_CHECK_LIB(pthread, pthread_mutex_init,
                 am_with_mpatrol_libs2="$am_with_mpatrol_libs2 -lpthread", [
      AC_CHECK_LIB(pthreads, pthread_mutex_init,
                   am_with_mpatrol_libs2="$am_with_mpatrol_libs2 -lpthreads", [
        AC_CHECK_LIB(thread, pthread_mutex_init,
                     am_with_mpatrol_libs2="$am_with_mpatrol_libs2 -lthread")
       ]
      )
     ]
    )
   fi

   # We now know what libraries to use in order to link with libmpatrol.

   AC_DEFINE(HAVE_MPATROL, 1, [Define if using mpatrol])
   if test "$am_with_mpatrol_threads" = 1
   then
    LIBS="-lmpatrolmt $am_with_mpatrol_libs2 $LIBS"
   else
    LIBS="-lmpatrol $am_with_mpatrol_libs2 $LIBS"
   fi

   # Finally, verify that mpatrol is correctly installed and that we can
   # link a simple program with it.

   AC_CACHE_CHECK(for working mpatrol, am_cv_with_mpatrol, [
     AC_TRY_LINK([#include <mpatrol.h>], [
int main(void)
{
    malloc(4);
    return EXIT_SUCCESS;
}
],
      [am_cv_with_mpatrol=yes],
      [am_cv_with_mpatrol=no]
     )
    ]
   )

   if test "$am_cv_with_mpatrol" = no
   then
    AC_MSG_ERROR(mpatrol not installed correctly)
   fi
  else
   AC_MSG_RESULT(no)
  fi
 ]
)