Re: AC_FC_MODULE_FLAG

[Ralf Wildenhues]

On Wed, Jul 06, 2011 at 03:59:13PM -0600, Jim Edwards wrote:
> Okay, here is another method that seems to work,  I need to make the
> subdirectory read-only then
> try to compile another module in the main directory.   With the -M flag it
> fails because it can't write
> the .mod file in the conftest.dir

That's better; but what about w32?  IIUC Lahey also has a version for
that.  Can you just try to look if some module-like file exists in the
directory after the fact?  Something like
  case conftest.dir/*_* in
    *\*_\**) good... ;;
    *) Lahey... ;;
  esac

Thanks,
Ralf

> --- fortran.m4  (revision 327)
> +++ fortran.m4  (working copy)
> @@ -593,7 +593,7 @@
>  # IBM: -Idir (-qmoddir=dir for writing)
>  # Intel: -Idir -I dir (-mod dir for writing)
>  # Absoft: -pdir
> -# Lahey: -mod dir
> +# Lahey: -Idir (-Mdir or -mod dir for writing)
>  # Cray: -module dir, -p dir (-J dir for writing)
>  #       -e m is needed to enable writing .mod files at all
>  # Compaq: -Idir
> @@ -615,17 +615,23 @@
>        write(*,'(a)') 'gotcha!'
>        end subroutine
>        end module]],
> -  [cd ..
> +  # For Lahey -M will also write module and object files to that directory
> +  # make it read-only so that lahey fails over to -I
> +  [chmod -w .
> +   cd ..
>     ac_fc_module_flag_FCFLAGS_save=$FCFLAGS
>     # Flag ordering is significant for gfortran and Sun.
>     for ac_flag in -M -I '-I ' '-M ' -p '-mod ' '-module ' '-Am -I'; do
>       # Add the flag twice to prevent matching an output flag.
>       FCFLAGS="$ac_fc_module_flag_FCFLAGS_save ${ac_flag}conftest.dir
> ${ac_flag}conftest.dir"
>       AC_COMPILE_IFELSE([[
> -      program main
> +      module conftest_main
>        use conftest_module
> +      contains
> +      subroutine conftest
>        call conftest_routine
> -      end program]],
> +      end subroutine
> +      end module]],
>         [ac_cv_fc_module_flag="$ac_flag"])
>       if test "$ac_cv_fc_module_flag" != unknown; then
>         break
> @@ -633,6 +639,7 @@
>     done
>     FCFLAGS=$ac_fc_module_flag_FCFLAGS_save
>  ])
> +chmod +w conftest.dir
>  rm -rf conftest.dir
>  AC_LANG_POP([Fortran])
>  ])