[Bug rtl-optimization/60851] [4.9 Regression] ICE: in extract_constrain_insn_cached, at recog.c:2117 with -flive-range-shrinkage -mdispatch-scheduler -march=bdver4

["rth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60851

--- Comment #14 from Richard Henderson <rth at gcc dot gnu.org> ---
(In reply to Uroš Bizjak from comment #13)
> In 4.9 branch, the check is located in three different places throughout
> constrain_operands. There was a big cleanup by Richard Sandiford in this
> area [1].

Looks good.
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/64967] [5 Regression] Bootstrap fails due to errors in libstdc++ sources with `--enable-symvers=gnu-versioned-namespace'
Date: Mon, 23 Mar 2015 16:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd967

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> Or drop the gnu-versioned-namespace support altogether.

I'd like to do that ... maybe for GCC 6 though. It seems a bit late now to
remove it without deprecation.

> Anyway, if you don't, bumping it to _8 and always using the new ABI sounds
> like a good plan to me.

That proved quite difficult. My plan for now is to simply force
--disable-libstdcxx-dual-abi when gnu-versioned-namespace is in use, so it
bootstraps and can be used, just without the new GCC 5 hotness.