# Checks whether to use gcc's pch support AC_DEFUN([ABI_GCC_PCH],[ AC_ARG_ENABLE(gcc-pch, [ --enable-gcc-pch[=yes no auto] use gcc4 pch support (default=auto)], enable_gcc_pch=$enableval,enable_gcc_pch=auto) AC_MSG_CHECKING(whether to use gcc precompiled headers with $CXX) if test "x$GCC" = "xyes" ; then _abi_gcc_version=`$CXX --version | grep -m 1 GCC | cut -f 3 -d " "` _abi_gcc_major=`echo $_abi_gcc_version | cut -f 1 -d "."` if [[ "$_abi_gcc_major" -ge "4" ]] ; then if test "x$enable_gcc_pch" = "xyes" ; then AC_MSG_RESULT(yes) abi_gcc_pch="yes" elif test "x$enable_gcc_pch" = "xauto" ; then AC_MSG_RESULT(yes) abi_gcc_pch="yes" else AC_MSG_RESULT(no) abi_gcc_pch="no" fi else AC_MSG_RESULT(no) abi_gcc_pch="no" fi else abi_gcc_pch="no" fi AM_CONDITIONAL(USE_GCC_PCH, test "x$abi_gcc_pch" = "xyes") ])