@@ -456,7 +456,7 @@
<code class="varname">CPLUSPLUS_CPP_SPEC</code> in
the gcc config headers for your target (and try changing them to
see what happens when building complicated code). You can also run
- <span class="command"><strong>g++ -E -dM - < /dev/null"</strong></span> to display
+ <span class="command"><strong>g++ -E -dM -x c++ /dev/null</strong></span> to display
a list of predefined macros for any particular installation.
</p><p>This has been discussed on the mailing lists
<a class="link" href="http://gcc.gnu.org/cgi-bin/htsearch?method=and&format=builtin-long&sort=score&words=_XOPEN_SOURCE+Solaris" target="_top">quite a bit</a>.
@@ -580,7 +580,7 @@
<varname>CPLUSPLUS_CPP_SPEC</varname> in
the gcc config headers for your target (and try changing them to
see what happens when building complicated code). You can also run
- <command>g++ -E -dM - < /dev/null"</command> to display
+ <command>g++ -E -dM -x c++ /dev/null</command> to display
a list of predefined macros for any particular installation.
</para>
<para>This has been discussed on the mailing lists