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Re: [PATCH for-4.15] xen: Bump the minimum version of GCC supported to 4.9 (5.1 on arm64)
- To: Julien Grall <julien@xxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Sun, 7 Mar 2021 11:57:40 +0100
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- Cc: <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, "Andrew Cooper" <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, "Stefano Stabellini" <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
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On Sat, Mar 06, 2021 at 09:41:48PM +0000, Julien Grall wrote:
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> Compilers older than 4.8 have known codegen issues which can lead to
> silent miscompilation:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145
>
> Furthermore, pre-4.9 GCC have known bugs (including things like
> internal compiler errors on Arm) which would require workaround (I
> haven't checked if we have any in Xen).
>
> The minimum version of GCC to build the hypervisor is now raised to 4.9.
The README entry doesn't differentiate between tools and hypervisor
GCC version, can the bug above also manifest in toolstack code?
I don't think it makes much sense to have diverging requirements for
tools vs hypervisor builds, but if the bug(s) can also manifest in
toolstack code we might want to add a GCC version check to
tools/configure.ac.
Thanks, Roger.
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