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)
])

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