do include file processing with the @code{.include} directive
(@pxref{Include,,@code{.include}}). You can use the @sc{gnu} C compiler driver
to get other ``CPP'' style preprocessing by giving the input file a
-@samp{.S} suffix. @xref{Overall Options, ,Options Controlling the Kind of
-Output, gcc info, Using GNU CC}.
+@samp{.S} suffix. @url{https://gcc.gnu.org/onlinedocs/gcc/Overall-Options.html#Overall-Options,
+See the 'Options Controlling the Kind of Output' section of the GCC manual for
+more details}
Excess whitespace, comments, and character constants
cannot be used in the portions of the input text that are not