Re: Treat undeclared macro constants as zero?

Victor Bazarov <>
Tue, 18 Aug 2009 21:09:54 -0400
Sin Jeong-hun wrote:

Is it possible to configure the preprocessor

No. There is nothing really you can change aside from the command line
switches: to define a macro and optionally give it a value and tell the
preprocessor where to look for files when a full path is not specified.
  The preprocessor is not open for "configuring". Macros that are not
defined are not defined.

 > so that when it

encounters some undeclared macro constant in the C code then it
replaces it with zero? The situation is complicated but basically we
have some master "configuration file" which is actually a c file that
has all values as macro constants. Each time someone adds a new macro
constant to the master configuration file, we must update all other
branch configuration files accordingly by putting zeros for the
constant, because zero means it's not supported. So, if the
preprocessor replaces undeclared macro constants with zero
automatically, then it would be a lot easier.

What if you just include that "master configuration file" in all other
files? That way all your macros are magically defined... And there is
no need to do it again manually in more than one place - that's what the
include (header) files are for. Or maybe I'm just crazy, of course.

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