meissner@tiktok.dg.com (Michael Meissner) (04/27/89)
In article <1954@trantor.harris-atd.com> bbadger@x102c.harris-atd.com (Bernie Badger Jr.) writes: /* ... */ | What I want is a way to find out *all* the names that are defined. | | I don't believe that the current cpp implementations have a way to do this, | so I am really proposing defining a ``standard option'' which could be | implemented in future cpp's. Actually the cpp that comes with GNU 1.34 has a switch to do what you want, though it is undocumented. If you invoke /usr/local/lib/gcc-cpp with the -d switch, it will do the preprocessing, but only emit the #defines (including the default definitions). Thus, you wound say: /usr/local/lib/gcc-cpp -d </dev/null to get the names that are defined. Also note that both the Sun /bin/cc and GNU GCC have a switch: -v which prints a verbose trace of each program executed, and the switches passed to it. Both of these compilers pass -undef to the preprocessor, which means ignore the default defines, only use the defines as defined with -D on the cpp command line. The -v switch also prints all of these names. I've redirected followups to comp.lang.c, which seems a more appropriate newsgroup than either comp.unix.questions, or comp.std.c. -- Michael Meissner, Data General. Uucp: ...!mcnc!rti!xyzzy!meissner If compiles were much Internet: meissner@dg-rtp.DG.COM faster, when would we Old Internet: meissner%dg-rtp.DG.COM@relay.cs.net have time for netnews?