where to find all those #ifdef's and #defines

[Randal Schwartz]

In article <40059 at ames.arc.nasa.gov>, dwhitney at pioneer (David Whitney- RCD) writes:
| I've got a lot of programs that run on different systems and I want to find
| out where each is running (among other things).  I've seen a lot of
| cpp commands to determine some things (e.g.
| 
| #ifdef CRAY
| ...do such and such
| #endif
| 
| Where is "CRAY" defined?  Or "unix" or "sgi", etc.?
| 
| Does anyone know who, what, or where to find these definitions for each
| machine?  What I'd like (ideally) is a list of the variables that
| are #define'ed at any one time.  Thanks,

Here it is (and it's not even in Perl :-)...

#!/bin/sh
strings -2 /lib/cpp |
sort -u |
awk '/^[a-zA-Z_][a-zA-Z0-9_]*$/ { print "#ifdef " $0 "\n__" $0 "\n#endif" }' |
/lib/cpp |
sed -n 's/^__//p'

This presumes that you have access to your cpp as '/lib/cpp'.  This is
true for (nearly?) all of the unicies that I've played with, but
beware.  It also presumes you have a BSD-like 'strings' command.

Just another longtime C hacker,
-- 
/== Randal L. Schwartz, Stonehenge Consulting Services (503)777-0095 ====\
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