1dnl Usage: TL_AC_GXX_INCLUDE_DIR
2dnl
3dnl Set $gxx_include_dir to the location of the installed C++ include
4dnl directory.  The value depends on $gcc_version and the configuration
5dnl options --with-gxx-include-dir and --enable-version-specific-runtime-libs.
6dnl
7dnl If you change the default here, you'll need to change the gcc and
8dnl libstdc++-v3 subdirectories too.
9AC_DEFUN([TL_AC_GXX_INCLUDE_DIR],
10[
11case "${with_gxx_include_dir}" in
12  yes)
13    AC_MSG_ERROR([--with-gxx-include-dir=[[dir]] requires a directory])
14    ;;
15  no | "")
16    case "${enable_version_specific_runtime_libs}" in
17      yes) gxx_include_dir='$(libsubdir)/include/c++' ;;
18      *)
19	libstdcxx_incdir='c++/$(gcc_version)'
20	gxx_include_dir='$(prefix)/include/$(libstdcxx_incdir)' ;;
21    esac ;;
22  *) gxx_include_dir=${with_gxx_include_dir} ;;
23esac
24AC_SUBST(gxx_include_dir)
25AC_SUBST(libstdcxx_incdir)
26])
27