Re: [PATCH] ARM: add a private asm/unaligned.h

[Russell King - ARM Linux]

On Mon, Oct 30, 2017 at 06:01:44PM +0100, Arnd Bergmann wrote:
> Right, either fail the build or use the workaround from the gcc bugzilla,
> passing -fno-store-merging to the broken compilers avoids the problem
> reliably at the cost of slightly worse code. For the decompressor, we might
> also get away with passing -march=armv5t (not armv5te), which has
> experimentally been found to avoid the problem and produce better code
> than "-march=armv6 -fno-store-merging" as it avoids the strd instruction
> but not other store merging.

Depends how important the compilers are...

We currently refuse to build using these compilers:

gcc = 3.x where x < 3
gcc = 4.x where x < 3 if unwinding is enabled
gcc = 4.8.x where x < 3

-- 
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