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conceptual help

I dont understand why to use i586 i686 x86_64, etc as targets if gcc
produces only one excecutable for all i386 and x86_64 processors

it is not better to have only one gcc-binary, aka i386-gcc for all
that processors and use "i386-gcc -march=i586",  "i386-gcc
-march=i686" and  "i386-gcc -march=x86_64"?

I was reading http://wiki.osdev.org/GCC_Cross-Compiler and I cant find
any reason to have diferent gcc binaries and binutils for each
processor, only one for each -b gcc backends

thank you for your attention.


-- 
Diego Saravia
Diego.Saravia@gmail.com
NO FUNCIONA->dsa@unsa.edu.ar

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