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dnl Usage: TL_AC_GXX_INCLUDE_DIR

dnl

dnl Set $gxx_include_dir to the location of the installed C++ include

dnl directory.  The value depends on $gcc_version and the configuration

dnl options --with-gxx-include-dir and --enable-version-specific-runtime-libs.

dnl

dnl If you change the default here, you'll need to change the gcc and

dnl libstdc++-v3 subdirectories too.

AC_DEFUN([TL_AC_GXX_INCLUDE_DIR],

[

case "${with_gxx_include_dir}" in

  yes)

    AC_MSG_ERROR([--with-gxx-include-dir=[[dir]] requires a directory])

    ;;

  no | "")

    case "${enable_version_specific_runtime_libs}" in

      yes) gxx_include_dir='$(libsubdir)/include/c++' ;;

      *)

        libstdcxx_incdir='c++/$(gcc_version)'

        gxx_include_dir='include/$(libstdcxx_incdir)'

        if test -n "$with_cross_host" &&

           test x"$with_cross_host" != x"no"; then

          gxx_include_dir='${prefix}/${target_alias}/'"$gxx_include_dir"

        else

          gxx_include_dir='${prefix}/'"$gxx_include_dir"

        fi;;

    esac ;;

  *) gxx_include_dir=${with_gxx_include_dir} ;;

esac

AC_SUBST(gxx_include_dir)

AC_SUBST(libstdcxx_incdir)

])