I'd like to second Yedidyah's suggestion and re-express it as an
application of the "Lion in the desert" methodology.
The "desert division into halves by fences" can proceed along at least
two dimensions:
1. Reduction of the size of a module which compiles differently in the
two platforms (Yedidyah suggested to take out functions to their own
separate files). First, by compiling a single function, then by taking
code out of it until you (Shachar) get the smallest code snippet that
builds differently in both systems.
2. Elimination of build steps as suspects - you (Shachar) already
eliminated the preprocessor. You could eliminate the compiler proper by
building *.o files in one system, and building libraries + executables
in both systems & comparing them. Similarly - for the linker and
binutils tools (of whose existence I was reminded by Oleg Goldshmidt).
--- Omer
On Wed, 2010-02-10 at 08:37 +0200, Yedidyah Bar-David wrote:
> 3. Give us some more clues. This practically means a short example
> where this happens. Since you have the sources that compile differently,
> you might try to find out e.g. if taking just the function(s) that
> compiled differently and putting them in their own file still compiles
> them differently, and then post them (or something similar) (with your
> client's permission, if applicable). I know that gcc can optimize on
> a larger scope than a function, but this might work.
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