[Buildroot] gcc 4.7.2 and arm OABI

[hayate]

The OABI is disabled in menuconfig with gcc 4.7.x, the latest gcc with OABI
support is 4.6

But recently I found that if configure gcc 4.7 with --enable-obsolete, it
can be built with OABI support (--with-abi=apcs-gnu)

Is there any possibility to build gcc 4.7 with OABI in buildroot?

regards,
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