d74b9a1 breaks ARM build (gcc 4.6)

d74b9a1 breaks ARM build (gcc 4.6)

[Leif Lindholm]

Commit d74b9a1, "Ensure that -mno-unaligned-access or some equivalent
option is used.", breaks the configure step on my Debian Jessie, with
a default 4.6.4 toolchain:
"configure: error: couldnt instruct compiler not to use unaligned access"

Where -mno-unalignes-access is not supported by gcc, it does not
generate unaligned instructions. Was this inserted for llvm? If so, what
was the fault this was fixing?

/
    Leif

Re: d74b9a1 breaks ARM build (gcc 4.6)

[Vladimir 'φ-coder/phcoder' Serbinenko]

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On 02.12.2013 19:30, Leif Lindholm wrote:
> Commit d74b9a1, "Ensure that -mno-unaligned-access or some equivalent
> option is used.", breaks the configure step on my Debian Jessie, with
> a default 4.6.4 toolchain:
> "configure: error: couldnt instruct compiler not to use unaligned access"
> 
> Where -mno-unalignes-access is not supported by gcc, it does not
> generate unaligned instructions. Was this inserted for llvm? If so, what
> was the fault this was fixing?
> 
The reason to force to have some version of this argument is following
excerpt from gcc manual:
" By default unaligned access is disabled for all pre-ARMv6 and all
ARMv6-M architectures, and enabled for all other architectures."
Clearly not what we want.
Perhaps we should instead check that __ARM_FEATURE_UNALIGNED is not defined.
> /
>     Leif
> 
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> https://lists.gnu.org/mailman/listinfo/grub-devel
> 



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Re: d74b9a1 breaks ARM build (gcc 4.6)

[Vladimir 'φ-coder/phcoder' Serbinenko]

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Fixed.
On 02.12.2013 19:30, Leif Lindholm wrote:
> Commit d74b9a1, "Ensure that -mno-unaligned-access or some equivalent
> option is used.", breaks the configure step on my Debian Jessie, with
> a default 4.6.4 toolchain:
> "configure: error: couldnt instruct compiler not to use unaligned access"
> 
> Where -mno-unalignes-access is not supported by gcc, it does not
> generate unaligned instructions. Was this inserted for llvm? If so, what
> was the fault this was fixing?
> 
> /
>     Leif
> 
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/grub-devel
> 



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