gcc-4.5 -fdelayed-branch strikes back

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Hi team,

While trying to build gcc-4.5, `gengenrtl -h` segfaults.
As you know, gengenrtl is built using the new gcc during stage 2.

I've been doing several tests and using BOOT_FLAGS="-O2
-fno-delayed-branch" allows gcc to build correctly.

I'll try to provide a testcase but I'm usually unsuccessful while
trying to do so.

Is there any known issue with -fdelayed-branch ?

I know about PR38740 but the fix should be included in 4.5 by now.

Any other useful debug I can provide ?

Thanks,
  Guy
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