Makefile with sources in diferent folders

[Boris Godin]

Hi guys!
I have a problem to create a makefile when using 2 types of sources.
Suppose we have sources at master_source folder:
- 1.c
- 2.c
and also we have sources at platform_source folder:
- 1.c

I really need to use platform_source folder because there is many of 
them (one folder with 1.c, 2.c, neither or both for each platform)

I need to copy master_source files to a diferent folder (say tmp) and 
there overwrite files with ones at platform_source folder.

So if i touch platform_source/1.c it shoul copy only this file to tmp 
folder. And if i touch master_src/1.c, it should copy master_src/1.c to 
tmp and after it copy platform_source/1.c to tmp (or don't do anything, 
because our source depends mostly on platform_source folder).

If someone can help me to create such a makefile i would apreciate it.
Thanks!


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