Difference gcc options "-m32" and "-arch i386"

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Could someone please explain me the difference between the two gcc/g++
options "-m32" and "-arch i386"? Is there any difference when used as a
compiler or linker flag?

Since I upgraded to Mac OSX Snowleopard I had a hard time to compile most of
my programs and the best solution I found so far is to use those two
options. However, I am not really aware of the difference between them. 

Thanks for your help.
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