Compilation speedup trick: any side-effects?

Hi all,

to reduce the build-time of our project we use following trick:

Instead of compiling each CPP and linking together, we auto-generate a
CPP which includes all CPP of the project and compile only this one.
The effect is that the compiler has to compile each involved header
only once opposed to a per-cpp-file basis.

The question is: once it compiled successfully (no duplicate
definitions etc), is there any side-effect possible? Is the linked
library/executable any different than the one produced the 'normal'
way?

There is one issue I already can think of: the order of the execution
of constructors of static objects (like global variables). Any more?

Thanks for any assistance!
Peter Holtwick

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