Thanks a lot for your replies Rennie and Matthias.  This is really helpful.

Arvind

On Dec 19, 2007 7:48 PM, Rennie deGraaf <[EMAIL PROTECTED]> wrote:
>
> On Dec 18, 2007 8:55 PM, Arvind Swaminathan <[EMAIL PROTECTED]> wrote:
> > In the Makefile only the objects are listed.  I don't see the rules
> > for creating the objects.  For instance, I would like to know the
> > place where the compile command to create mac-802-11.o is located
> > (since I want to add a -Ddegub flag to the cc command).
>
> There isn't an explicit rule to make mac-802_11.o.  The makefile falls
> back on the
> implicit rule to build a .o file from a .cc file, which is
>     .cc.o:
>             @rm -f $@
>             $(CPP) -c $(CFLAGS) $(INCLUDES) -o $@ $*.cc
> If you want to set that macro for all files in ns,  you should do is
> to add "-Ddegub"
> to "DEFINE" in Makefile.in, re-run configure, and then make, or better
> yet, just run
>     CFLAGS="-Ddegub" make
> That will set the "CFLAGS" variable in your system environment before running
> make, which will incorporate its value into the CFLAGS string that it uses.
>
> If you only want to set that macro on the one file, add a rule to
> Makefile.in similar
> to the following:
>     mac/mac-802_11.o: mac/mac-802_11.cc
>             @rm -f $@
>             $(CC) -c $(CFLAGS) -Ddegub $(INCLUDES) -o $@ $*.cc
> Then, re-run configure and make.
>
> Rennie deGraaf
>

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