pre-processor with the \tr{-opt} flags (see
\sectionref{forcing-options-through}).
-A small word of warning: \tr{-cpp} is not friendly to
-``string gaps''.\index{-cpp vs string gaps}\index{string gaps vs -cpp}
+A small word of warning: \tr{-cpp} is not friendly to ``string
+gaps''.\index{-cpp vs string gaps}\index{string gaps vs -cpp}. In
+other words, strings such as the following:
+\begin{verbatim}
+ strmod = "\
+ \ p \
+ \ "
+\end{verbatim}
+
+don't work with \tr{-cpp}; \tr{/usr/bin/cpp} elides the
+backslash-newline pairs.
+
+However, it appears that if you add a space at the end of the line,
+then \tr{cpp} (at least GNU \tr{cpp} and possibly other \tr{cpp}s)
+leaves the backslash-space pairs alone and the string gap works as
+expected.
%************************************************************************
%* *