Re: [Xen-devel] staging GCC 8.1.0 build warnings

[John Thomson <lists@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

On Tue, 15 May 2018, at 04:20, Jason Andryuk wrote:
> > On Thu, May 10, 2018 at 09:38:26AM +1000, John Thomson wrote:
> >> /build/xen-git/src/xen/stubdom/tpm_emulator-x86_64/tpm/tpm_deprecated.c:437:7:
> >>  error: 'memcmp' reading 20 bytes from a region of size 8 
> >> [-Werror=stringop-overflow=]
> >>    if (memcmp(&b1, &newAuthLink, sizeof(TPM_HMAC))) {
> >>        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> A fix is proposed upstream:
> https://github.com/PeterHuewe/tpm-emulator/pull/30/commits/910c43273c9f3373f93c2e8b8b0929d89fdcead6

Thank you, I had completely missed that. 


The qemu-xen patches to fix gcc-8 warnings are in qemu-xen staging, but they 
are not yet in master.
This will need a new tag for the next 4.11rc when they come through?


> >> For IPXE, one of these patches:
> >> https://build.opensuse.org/package/view_file/openSUSE:Factory/qemu/ipxe-efi-guard-strncpy-with-gcc-warning-ignore-pragma.patch?expand=1

For IPXE I needed the  [build] Use -no-pie on newer versions of gcc patch, as 
well as the guard-strncpy patch.
https://github.com/ipxe/ipxe/commit/7c395b0e21806b946fe944a27fc273407f357ea1

Cheers,
-- 
  John Thomson

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