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dnl Copyright (C) 1988 Eleftherios Gkioulekas <lf@amath.washington.edu>

dnl Copyright (C) 2009 Free Software Foundation, Inc.

dnl  

dnl This program is free software; you can redistribute it and/or modify

dnl it under the terms of the GNU General Public License as published by

dnl the Free Software Foundation; either version 3 of the License, or

dnl (at your option) any later version.

dnl 

dnl This program is distributed in the hope that it will be useful,

dnl but WITHOUT ANY WARRANTY; without even the implied warranty of

dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

dnl GNU General Public License for more details.

dnl 

dnl You should have received a copy of the GNU General Public License

dnl along with this program; if not, write to the Free Software 

dnl Foundation, Inc., 51 Franklin Street, Boston, MA 02110-1301, USA.

dnl 

dnl As a special exception to the GNU General Public License, if you 

dnl distribute this file as part of a program that contains a configuration 

dnl script generated by Autoconf, you may include it under the same 

dnl distribution terms that you use for the rest of that program.

# --------------------------------------------------------------------------

# Check whether the C++ compiler accepts a certain flag

# If it does it adds the flag to lf_CXXFLAGS

# If it does not then it returns an error to lf_ok

# Usage:

#   LF_CHECK_CXX_FLAG(-flag1 -flag2 -flag3 ...)

# -------------------------------------------------------------------------

AC_DEFUN([LF_CHECK_CXX_FLAG],[

  echo 'void f(){}' > conftest.cc

  for i in $1

  do

    AC_MSG_CHECKING([whether $CXX accepts $i])

    if test -z "`${CXX} $i -c conftest.cc 2>&1`"

    then

      lf_CXXFLAGS="${lf_CXXFLAGS} $i"

      AC_MSG_RESULT(yes)

    else

      AC_MSG_RESULT(no)

    fi

  done

  rm -f conftest.cc conftest.o

  AC_SUBST(lf_CXXFLAGS)

])

# --------------------------------------------------------------------------

# Check whether the C compiler accepts a certain flag

# If it does it adds the flag to lf_CFLAGS

# If it does not then it returns an error to lf_ok

# Usage:

#  LF_CHECK_CC_FLAG(-flag1 -flag2 -flag3 ...)

# -------------------------------------------------------------------------

AC_DEFUN([LF_CHECK_CC_FLAG],[

  echo 'void f(){}' > conftest.c

  for i in $1

  do

    AC_MSG_CHECKING([whether $CC accepts $i])

    if test -z "`${CC} $i -c conftest.c 2>&1`"

    then

      lf_CFLAGS="${lf_CFLAGS} $i"

      AC_MSG_RESULT(yes)

    else

      AC_MSG_RESULT(no)

    fi

  done

  rm -f conftest.c conftest.o

  AC_SUBST(lf_CFLAGS)

])

# --------------------------------------------------------------------------

# Check whether the Fortran compiler accepts a certain flag

# If it does it adds the flag to lf_FFLAGS

# If it does not then it returns an error to lf_ok

# Usage:

#  LF_CHECK_F77_FLAG(-flag1 -flag2 -flag3 ...)

# -------------------------------------------------------------------------

AC_DEFUN([LF_CHECK_F77_FLAG],[

  cat << EOF > conftest.f

c....:++++++++++++++++++++++++

      PROGRAM MAIN

      PRINT*,'Hello World!'

      END

EOF

  for i in $1

  do

    AC_MSG_CHECKING([whether $F77 accepts $i])

    if test -z "`${F77} $i -c conftest.f 2>&1`"

    then

      lf_FFLAGS="${lf_FFLAGS} $i"

      AC_MSG_RESULT(yes)  

    else

      AC_MSG_RESULT(no)

    fi

  done

  rm -f conftest.f conftest.o

  AC_SUBST(lf_FFLAGS)

])

# ----------------------------------------------------------------------

# Enable compiler warnings. 

# Call this command AFTER you have configured ALL your compilers. 

# ----------------------------------------------------------------------

AC_DEFUN([LF_SET_WARNINGS],[

  dnl Warnings for the two main compilers

  dnl add -Wextra when you're got time to fix a bunch of them ;-)

  cc_warning_flags="-Wall -Werror-implicit-function-declaration"

  cxx_warning_flags="-Wall -Woverloaded-virtual"

  if test -n "${CC}"

  then

    LF_CHECK_CC_FLAG($cc_warning_flags)

  fi

  if test -n "${CXX}" 

  then

    LF_CHECK_CXX_FLAG($cxx_warning_flags)

  fi

])