Multiple arch rpm install in EM64T

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Dear all,

I am using RedHat WS3 on a EM64T. And I found that it installs both
x86_64 and i386 rpms of some softwares, in order to provide the
compatibility of running i386 application on EM64T. 

But for some rpm package, both x86_64 and i386 version contain the file
in the same path. For example, for the tcl-8.3.5 rpm, both x86_64 and
i386 arch rpm contain the binary file "/usr/bin/tclsh8.3". The file in
x86_64 rpm is 64-bit and the file in i386 rpm is 32-bit.

So how can rpm determine which binary file should it install to that
path, if both x86_64 and i386 rpm is installed? In tcl case, it seems
that the system always keeps the 64-bit one. Is this behaviour
maintained by rpm? Or it needs some 'tricks' in spec file? I would like
to know the detail but I can't find any doc about that.

Best regards,
John Lau

-- 
John Lau Chi Fai
cflau@xxxxxxxxxxxxxxx
Software Engineer
Center for Large-Scale Computation

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