Re: [Qemu-devel] [PATCH 1.0] configure: build position independent executables across the board, by default

[Peter Maydell]

On 14 November 2011 15:18, Avi Kivity <address@hidden> wrote:
> On 11/14/2011 05:15 PM, Peter Maydell wrote:
>> One of the failure cases I was thinking of is that if PIE means
>> the platform's loader puts things in a different bit of the
>> address space this might break TCG's assumptions about maximum
>> distances between the codegen buffer and host C code. (That's
>> a bug in TCG really but it would still be near-to-release
>> breakage.)

And indeed testing this on an ARM host running i386 TCG system
mode, applying this patch causes qemu to fail at startup with
a tcg abort due to an out of range jump.

I've already said that ARM is going to be broken for 1.0 so
that's not inherently a problem but it does indicate that
we definitely need to test the other TCG target systems
(and not just a "does it compile" test) if we want to put
this change in.

-- PMM