Altering #ifdef in c file from port make...

[JamesElstone]

Hi All,

Basic 101 question:

I have a c file which is compiled in a port via the ports Makefile, by running make.

In the c file are numerous #ifdef var evaluations:

void report(char *msg)
{
#ifdef DEBUG
  # ifndef DEBUG_MW
    fprintf(stderr, msg);
  # else
    mexPrintf( msg );
  # endif /* DEBUG_MW */
#endif /* DEBUG */
}

How from the make command line can I set these variables to be true?

Kr,

James

 

[SirDice]

make -DDEBUG

make(1):

     -D variable
             Define variable to be 1, in the global context.

 

[JamesElstone]

Ta,

Is there a way to list all defined vars?

James

 

[kpa]

Ta,

Is there a way to list all defined vars?

James

I found this with a google search:

http://stackoverflow.com/questions/2421499/listing-c-constants-macros

Simplest way seems to be:

cpp -dM /dev/null

 

[wblock@]

Is there a way to list all defined vars?

In ports, there are a lot. First, cd to the port directory. Then:
For csh(1): make -Ndg1 |& grep = | sort -u | less
For sh(1): make -Ndg1 2>&1 grep = | sort -u | less

Some of those are not variables, the grep = is the weak spot. Suggestions for a better way would be welcome.