[oe] [meta-qt5] qtscript, qtwebking: disable thumb issues on armv7

[Khem Raj]

On Wed, Dec 23, 2015 at 12:19 AM, Andreas Müller
<schnitzeltony at googlemail.com> wrote:
> Hi
>
> The story occured on jethro but I think it is the same for master:
>
> We have a simple application containing a QWebView which segfaulted
> during loading a page on a CortexA9 (armv7 thumb2). After enabling
> debug information for qtwebkit and remote debug session the point of
> segfault was detected in
>
> qtwebkit: Source/JavaScriptCore/llint/LowLevelInterpreter.asm:1082
>    callSlowPath(_llint_slow_path_new_func_exp)
>
> Further digging around lead to similar source in:
>
> * qtwebkit: Source/JavaScriptCore/assembler/ARMv7Assembler.h
> * qtscript: src/3rdparty/javascriptcore/JavaScriptCore/assembler/ARMv7Assembler.h
>
> In these files a class ARMThumbImmediate is declared and used in many
> places. This lead me to the assumption that compiling for armv7
> expects thumb support.
>
> So I removed the
>
> ARM_INSTRUCTION_SET = "arm"

LLInt backend with JIT  is only supporting thumb2 instr set for armv7+
so thats what you did when you removed above. There are ways to disable JIT
in jscore but you have to dig for it.

>
> and our application worked fine. To be a good boy I then build tested
> with ARM_INSTRUCTION_SET = "thumb" and for qemuarm: It still fails.
>
> So what would the right way to go? Something like the pending patch
> for icu replacing
>
> ARM_INSTRUCTION_SET = "arm"
>
> by
>
> ARM_INSTRUCTION_SET_armv4 = "arm"
> ARM_INSTRUCTION_SET_armv5 = "arm"
>
> Opinions?

this is right fix here.

>
> Andreas
> --
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