More waf confusion

[Hal Murray]

esr at thyrsus.com said:
> Earlier today I experimented with define_name="".  This suppressed #define
> emission to config.h. I have not yet checked for side effects.

Thanks.

I diff-ed config.h with and without that addition.  The only change is 
dropping that one line.

It builds and runs, at least on my systems.  So I pushed it.

I can't make a similar fix for Gary's linker stuff since he is using 
define_name.


Gary:
> In your case the define name is calculated automatically.  Looking at the
> code I see no way to avoid the automagic.  Only thing we could do is
> undefine it after the test. 

Is there an obvious code snippet I can copy to undefine a name?  Will it be 
obvious if I read the code you pointed at?



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