I don't agree with this approach.  I think that we should include what
we use, and that should extend to headers that provide nonstandard
macro definitions.  I think that we should be expressing as much as
possible in code rather than in build environments.  Most importantly,
I don't like the idea of globally polluting the macro namespace for
something like this.  Our OS_* macros are ours (emphasis on "ours")
and I don't want to leak those defines to all of the other third-party
code that we build.

Mark

Evan Martin wrote:
> A few people I've talked to independently have expressed interest in
> getting rid of build/build_config.h.
>
> It is easy to forget to include, requires being included in a
> nonstandard place, and ends up being used everywhere anyway.  It is
> easier to just define the few #defines we need in build scripts.  (I
> think the compiler- and architecture- specific defines could move to a
> different file eventually, but we almost never use those.)
>
> http://codereview.chromium.org/21401 does this.  It seems to work on
> Windows (I'd like an expert to doublecheck I did it the right way) but
> my wild guess at making Mac work is apparently wrong.  If any Mac
> expert could help out, I'd appreciate it.

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