dnl @synopsis AX_DMD
dnl
dnl Test for the presence of a DMD-compatible D2 compiler, and (optionally)
dnl specified modules on the import path.
dnl
dnl If "DMD" is defined in the environment, that will be the only
dnl dmd command tested. Otherwise, a hard-coded list will be used.
dnl
dnl After AX_DMD runs, the shell variables "success" and "ax_dmd" are set to
dnl "yes" or "no", and "DMD" is set to the appropriate command. Furthermore,
dnl "dmd_optlink" will be set to "yes" or "no" depending on whether OPTLINK is
dnl used as the linker (DMD/Windows), and "dmd_of_dirsep" will be set to the
dnl directory separator to use when passing -of to DMD (OPTLINK requires a
dnl backslash).
dnl
dnl AX_CHECK_D_MODULE must be run after AX_DMD. It tests for the presence of a
dnl module in the import path of the chosen compiler, and sets the shell
dnl variable "success" to "yes" or "no".
dnl
dnl @category D
dnl @version 2011-05-31
dnl @license AllPermissive
dnl
dnl Copyright (C) 2009 David Reiss
dnl Copyright (C) 2011 David Nadlinger
dnl Copying and distribution of this file, with or without modification,
dnl are permitted in any medium without royalty provided the copyright
dnl notice and this notice are preserved.


AC_DEFUN([AX_DMD],
         [
          dnl Hard-coded default commands to test.
          DMD_PROGS="dmd,gdmd,ldmd"

          dnl Allow the user to specify an alternative.
          if test -n "$DMD" ; then
            DMD_PROGS="$DMD"
          fi

          AC_MSG_CHECKING(for DMD)

          # std.algorithm as a quick way to check for D2/Phobos.
          echo "import std.algorithm; void main() {}" > configtest_ax_dmd.d
          success=no
          oIFS="$IFS"

          IFS=","
          for DMD in $DMD_PROGS ; do
            IFS="$oIFS"

            echo "Running \"$DMD configtest_ax_dmd.d\"" >&AS_MESSAGE_LOG_FD
            if $DMD configtest_ax_dmd.d >&AS_MESSAGE_LOG_FD 2>&1 ; then
              success=yes
              break
            fi
          done

          if test "$success" != "yes" ; then
            AC_MSG_RESULT(no)
            DMD=""
          else
            AC_MSG_RESULT(yes)
          fi

          ax_dmd="$success"

          # Test whether OPTLINK is used by trying if DMD accepts -L/? without
          # erroring out.
          if test "$success" == "yes" ; then
            AC_MSG_CHECKING(whether DMD uses OPTLINK)
            echo "Running \”$DMD -L/? configtest_ax_dmd.d\"" >&AS_MESSAGE_LOG_FD
            if $DMD -L/? configtest_ax_dmd.d >&AS_MESSAGE_LOG_FD 2>&1 ; then
              AC_MSG_RESULT(yes)
              dmd_optlink="yes"

              # This actually produces double slashes in the final configure
              # output, but at least it works.
              dmd_of_dirsep="\\\\"
            else
              AC_MSG_RESULT(no)
              dmd_optlink="no"
              dmd_of_dirsep="/"
            fi
          fi

          rm -f configtest_ax_dmd*
         ])


AC_DEFUN([AX_CHECK_D_MODULE],
         [
          AC_MSG_CHECKING(for D module [$1])

          echo "import $1; void main() {}" > configtest_ax_dmd.d

          echo "Running \"$DMD configtest_ax_dmd.d\"" >&AS_MESSAGE_LOG_FD
          if $DMD -c configtest_ax_dmd.d >&AS_MESSAGE_LOG_FD 2>&1 ; then
            AC_MSG_RESULT(yes)
            success=yes
          else
            AC_MSG_RESULT(no)
            success=no
          fi

          rm -f configtest_ax_dmd*
         ])