compiling gcc 4.2 on solaris x86

[VenkatR]

Hello,

I want to compile gcc 4.2.2 on a solaris x86 machine ( solaris x86 with
amd64 libraries support on an amd64 hardware) that supports the -m64 option.
That is I would want the built gcc to be able to generate both 32 & 64 bit
output files. I have gcc compiler that comes with the solaris x86
distribution available for the compiling the source. 

My question is what will have to be done to build a gcc with -m64 option? 
Running configure, make, make  install in the very basic scenario doesnt get
gcc the -m64 support. Please advice on configure and make stage options /
variables that are needed for this.

Thanks in advance
VenkatR
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