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Re: [PATCH] arm64: build with -mcmodel=large
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From: |
Vladimir 'φ-coder/phcoder' Serbinenko |
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Subject: |
Re: [PATCH] arm64: build with -mcmodel=large |
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Date: |
Fri, 22 Jan 2016 19:13:12 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.5.0 |
On 22.01.2016 03:14, Colin Watson wrote:
> On Fri, Dec 25, 2015 at 06:18:55PM +0000, Leif Lindholm wrote:
>> So, it seems this toolchain generates the HI21/LO12 relocation combo:
>> - R_AARCH64_ADR_PREL_PG_HI21/R_AARCH64_ADR_PREL_PG_HI21_NC
>> - R_AARCH64_LDST16_ABS_LO12_NC
>> - R_AARCH64_LDST32_ABS_LO12_NC
>> - R_AARCH64_LDST64_ABS_LO12_NC
>> - R_AARCH64_LDST128_ABS_LO12_NC
>>
>> So I'll implement support for these.
>
> I found a temporary workaround for this via
> https://bugs.launchpad.net/bugs/1533009, which refers to
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63304; given that set of
> clues, I've confirmed that TARGET_CFLAGS='-Os
> -mpc-relative-literal-loads' fixes my build for the time being.
>
> This isn't necessarily a good solution for upstream, because only
> certain versions of GCC support it (although perhaps we could detect it
> in configure.ac until such time as appropriate relocation support is
> added?), but I'm mentioning it here in case any other distributors have
> the same problem.
>
I have implemented and committed the support for needed relocations
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