# Process this file with autoconf to produce a configure script.
AC_INIT()


#
# check for some programs we use
#

# save the CXXFLAGS specified by the user
save_CXXFLAGS=$CXXFLAGS

AC_PROG_CXX

# Step 1: set the variable "system" to hold the name and version number
# for the system.  This can usually be done via the "uname" command, but
# there are a few systems, like Next, where this doesn't work.

AC_MSG_CHECKING([system version (for dynamic loading)])
if test -f /usr/lib/NextStep/software_version; then
  system=NEXTSTEP-`awk '/3/,/3/' /usr/lib/NextStep/software_version`
else
    system=`uname -s`-`uname -r`
    if test "$?" -ne 0 ; then
	AC_MSG_RESULT([unknown (can't find uname command)])
	system=unknown
    else
	# Special check for weird MP-RAS system (uname returns weird
	# results, and the version is kept in special file).
    
	if test -r /etc/.relid -a "X`uname -n`" = "X`uname -s`" ; then
	    system=MP-RAS-`awk '{print $3}' /etc/.relid'`
	fi
	AC_MSG_RESULT($system)
    fi
fi

# restore the flags specified by the user and get rid of any flags
# found by autoconf (we do not want -02 -g by default)
CXXFLAGS=$save_CXXFLAGS


CMAKE_NO_EXPLICIT_TEMPLATE_INSTANTIATION=""
if test $ac_cv_prog_gxx = no; then
  CXXFLAGS_ORIG="$CXXFLAGS"
  CXXFLAGS="$CMAKE_ANSI_CXXFLAGS $CXXFLAGS"
  AC_MSG_CHECKING([whether ${CXX} supports explicit instantiation])
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_COMPILE([
  template<class T>class x{};template class x<int>;
  ],,[
  AC_MSG_RESULT(yes)
  ],[
  CMAKE_NO_EXPLICIT_TEMPLATE_INSTANTIATION=1
  AC_MSG_RESULT(no)
  ])
  AC_LANG_RESTORE
  CXXFLAGS="$CXXFLAGS_ORIG"
fi

# if running on darwin no explicit template instantiations even though
# syntax is supported.
case $system in 
  Darwin*) 
    CMAKE_NO_EXPLICIT_TEMPLATE_INSTANTIATION="1"
    ;;
esac
AC_SUBST(CMAKE_NO_EXPLICIT_TEMPLATE_INSTANTIATION)

CMAKE_ANSI_CXXFLAGS=""
# on hp use -Aa for ansi
if test $ac_cv_prog_gxx = no; then
case $system in
     IRIX-5* | IRIX-6* | IRIX64-6* | IRIX-64-6*)
        CXXFLAGS_ORIG="$CXXFLAGS"
        CXXFLAGS="-LANG:std $CXXFLAGS"
        AC_MSG_CHECKING([whether ${CXX} accepts -LANG:std])
        AC_LANG_SAVE
        AC_LANG_CPLUSPLUS
        AC_TRY_COMPILE([
        void foo() {}
        ],,[
        AC_MSG_RESULT(yes)
        CMAKE_ANSI_CXXFLAGS="-LANG:std"
        ],[
        AC_MSG_RESULT(no)
        ])
        AC_LANG_RESTORE
        CXXFLAGS="$CXXFLAGS_ORIG"
	;;      
     OSF1-*)

        CXXFLAGS_ORIG="$CXXFLAGS"
        CXXFLAGS="-std strict_ansi -nopure_cname $CXXFLAGS"
        AC_MSG_CHECKING([whether ${CXX} accepts -std strict_ansi -nopure_cname])
        AC_LANG_SAVE
        AC_LANG_CPLUSPLUS
        AC_TRY_COMPILE([
        void foo() {}
        ],,[
        AC_MSG_RESULT(yes)
        CMAKE_ANSI_CXXFLAGS="-std strict_ansi -nopure_cname"
        ],[
        AC_MSG_RESULT(no)
        ])
        AC_LANG_RESTORE
        CXXFLAGS="$CXXFLAGS_ORIG"
	;;      
esac
fi
AC_SUBST(CMAKE_ANSI_CXXFLAGS)

# if we are not running g++ then we might need some other flags
# to get the templates compiled correctly
CMAKE_TEMPLATE_FLAGS=""
if test $ac_cv_prog_gxx = no; then
  CXXFLAGS_ORIG="$CXXFLAGS"
  CXXFLAGS="$CMAKE_ANSI_CXXFLAGS $CXXFLAGS -ptused -no_prelink"
  AC_MSG_CHECKING([whether ${CXX} accepts -ptused -no_prelink])
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_COMPILE([
  void foo() {}
  ],,[
  AC_MSG_RESULT(yes)
  CMAKE_TEMPLATE_FLAGS="-ptused -no_prelink"
  ],[
  AC_MSG_RESULT(no)
  ])
  AC_LANG_RESTORE
  CXXFLAGS="$CXXFLAGS_ORIG"
fi
AC_SUBST(CMAKE_TEMPLATE_FLAGS)

# check compilers to see if they have std::stringstream
CXXFLAGS_ORIG="$CXXFLAGS"
CXXFLAGS="$CMAKE_ANSI_CXXFLAGS $CXXFLAGS"
AC_MSG_CHECKING([for ansi standard C++ stringstream])
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([
#include <sstream>
],,[
AC_MSG_RESULT(yes)
],[
CMAKE_NO_ANSI_STRING_STREAM=1
AC_MSG_RESULT(no)
])
AC_LANG_RESTORE
CXXFLAGS="$CXXFLAGS_ORIG"
AC_SUBST(CMAKE_NO_ANSI_STRING_STREAM)

# check to see if stl is in the std namespace
if test $ac_cv_prog_gxx = no; then
  CXXFLAGS_ORIG="$CXXFLAGS"
  CXXFLAGS="$CMAKE_ANSI_CXXFLAGS $CXXFLAGS"
  AC_MSG_CHECKING([whether the std namespace is supported])
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_COMPILE([
  #include <list>
  void foo() { std::list<int>(); }
  ],,[
  AC_MSG_RESULT(yes)
  ],[
  CMAKE_NO_STD_NAMESPACE=1
  AC_MSG_RESULT(no)
  ])
  AC_LANG_RESTORE
  CXXFLAGS="$CXXFLAGS_ORIG"
fi
AC_SUBST(CMAKE_NO_STD_NAMESPACE)

# check to see if for scoping is supported
if test $ac_cv_prog_gxx = no; then
  CXXFLAGS_ORIG="$CXXFLAGS"
  CXXFLAGS="$CMAKE_ANSI_CXXFLAGS $CXXFLAGS"
  AC_MSG_CHECKING([ansi for scope support])
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_COMPILE([
  void foo() { for(int i;;); for(int i;;); }
  ],,[
  AC_MSG_RESULT(yes)
  ],[
  CMAKE_NO_ANSI_FOR_SCOPE=1
  AC_MSG_RESULT(no)
  ])
  AC_LANG_RESTORE
  CXXFLAGS="$CXXFLAGS_ORIG"
fi
AC_SUBST(CMAKE_NO_ANSI_FOR_SCOPE)


# find make to use to build cmake, prefer gmake
AC_PATH_PROGS(CMAKE_AR_TMP, ar)
CMAKE_CXX_AR="$CMAKE_AR_TMP"
CMAKE_CXX_AR_ARGS="cr"
# if on SunOS and not using gXX then use the compiler to make .a libs
case $system in 
   SunOS-5*)
   if test $ac_cv_prog_gxx = yes; then
	:
   else
      echo "Using $CXX -xar -o for creating .a libraries"
      CMAKE_CXX_AR="$CXX"
      CMAKE_CXX_AR_ARGS="-xar -o"
   fi
   ;;
   IRIX*)
   if test $ac_cv_prog_gxx = yes; then
	:
   else
      echo "Using $CXX -xar -o for creating .a libraries"
      CMAKE_CXX_AR="$CXX"
      CMAKE_CXX_AR_ARGS="-ar -o"
   fi
   ;;
esac
AC_SUBST(CMAKE_CXX_AR)
AC_SUBST(CMAKE_CXX_AR_ARGS)

CMAKE_COMPILER_IS_GNUGXX=0
if test $ac_cv_prog_gxx = yes; then
	CMAKE_COMPILER_IS_GNUCXX=1
fi


CMAKE_CXX_LINK_SHARED=${CXX}
case $system in
  HP-UX-*)
	CMAKE_CXX_SHLIB_CFLAGS="+Z"
	CMAKE_CXX_SHLIB_SUFFIX=".sl"
	CMAKE_CXX_MODULE_SUFFIX=".sl"
	CMAKE_CXX_SHLIB_BUILD_FLAGS='+Z -Wl,-E -b -L/usr/lib'
	CMAKE_CXX_SHLIB_LINK_FLAGS='-Wl,+s'
	CMAKE_CXX_MODULE_BUILD_FLAGS='+Z -Wl,-E -b -L/usr/lib'
	CMAKE_CXX_MODULE_LINK_FLAGS='-Wl,+s'
        CMAKE_CXX_SHLIB_RUNTIME_FLAG='-Wl,+b,'
        CMAKE_CXX_SHLIB_RUNTIME_SEP=':'
esac
# CXX versions of shared flags
AC_SUBST(CMAKE_CXX_LINK_SHARED)
AC_SUBST(CMAKE_CXX_SHLIB_CFLAGS)
AC_SUBST(CMAKE_CXX_SHLIB_BUILD_FLAGS)
AC_SUBST(CMAKE_CXX_SHLIB_LINK_FLAGS)
AC_SUBST(CMAKE_CXX_MODULE_BUILD_FLAGS)
AC_SUBST(CMAKE_CXX_MODULE_LINK_FLAGS)
AC_SUBST(CMAKE_CXX_SHLIB_RUNTIME_FLAG)
AC_SUBST(CMAKE_CXX_SHLIB_RUNTIME_SEP)


AC_SUBST(CMAKE_COMPILER_IS_GNUCXX)
# generate output files.
# create mkdir files just to make some of the directories

AC_OUTPUT( CXXCMakeSystemConfig.cmake )
