Re: AC_DEFINE

[John Burger]

> From: Bob Lockie <address@hidden>
>
> I execute the following in configure.in:
> AC_DEFINE( [ENABLE_XMMS], [1] )
>
> yet this #ifdef in the source code doesn't work:
> #ifdef ENABLE_XMMS

You don't say how you expect this to happen.  Your question gives the 
impression that you think the AC_DEFINE in configure.ac and the #ifdef 
in the source file are sufficient, but this is not the case.  (You 
didn't say if you're using Automake - if so, then the two things you 
mention may indeed be enough.  Someone who uses Automake will have to 
comment.)

I can think of a number of ways to make this happen, including but not 
limited to:

  Having configure generate the source file itself

  Generating a header file that defines ENABLE_XMMS,
  which the source file includes

  Generating a Makefile (or makefile fragment) that directly or
  indirectly compiles the source file with -DENABLE_XMMS in the
  compiler flags, e.g., using @DEFS@

Which, if any, of these routes are you taking?

- John Burger
  MITRE