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dnl Copyright Toby White <tow21@cam.ac.uk>  2004-2006     

dnl @synopsis TW_CHECK_FC_FPP_90([ACTION_IF_TRUE],[ACTION_IF_FALSE])
dnl
dnl Checks whether the currently selected Fortran compiler supports
dnl cpp-like functionality when called on a suitable fixed-format file.
dnl If so, ACTION_IF_TRUE is performed; if not, ACTION_IF_FALSE
dnl 
dnl @version 1.0
dnl @author Toby White <tow21@cam.ac.uk>
dnl
AC_DEFUN([TW_CHECK_FC_FPP_90],[
dnl
AC_LANG_PUSH(Fortran)
dnl
AC_FPP_SRCEXT(F90)
ac_ext=F90
dnl
AC_MSG_CHECKING([whether $FC has an integrated Fortran cpp-style preprocessor for free-form source])
dnl
FCFLAGS_save=$FCFLAGS
FCFLAGS="$FCFLAGS $FPPFLAGS_F90 $FCFLAGS_free"
AC_COMPILE_IFELSE(
dnl The program is written in fixed-form source to avoid worrying
dnl about filename extensions.
  AC_LANG_SOURCE([[
Program test_cpp
#if 1
  Integer i
#else
  Integer j
#endif
End Program
   ]]),
   [AC_MSG_RESULT([yes])
    m4_ifval([$1],[$1],[])
   ],
   [AC_MSG_RESULT([no])
    m4_ifval([$2],[$2],
                  [AC_MSG_ERROR([A Fortran compiler with integrated cpp-style preprocessor for free-from source is required.])])
   ]
)
AC_LANG_POP(Fortran)

FCFLAGS=$FCFLAGS_save
dnl
])