Failed to compile on Ubuntu 26.04 (qemu vs. glibc)

[Jan Kellermann <jan.kellermann@xxxxxxxxx>]

Dear colleagues,

I would like to install Xen 3.22 (or 3.21) on Ubuntu. But the 
compilation of qemu fails with this error message:
initialisation discards ‘const’ qualifier from pointer target type


This affects the definition of variables for strstr(), because since 
glibc 2.42.9000 the return type of strstr() and other string functions 
changed to be 'const char *' when the input is a 'const char *'.
Ubuntu 26.04 uses a patched version based on QEMU 10.2.1 
(https://packages.ubuntu.com/resolute/qemu-system-x86-xen)
I am in the process of replacing the missing ‘const’ declarations, but I 
wonder whether a backport might be simpler.
See e.g. this commit:
https://gitlab.com/qemu-project/qemu/-/commit/326e620fc0145686124f754194cdc6d0d9b3400d

These commits are only available since V10.2.0

See also here:
https://git.redxen.eu/RepoMirrors/qemu/commit/326e620fc0145686124f754194cdc6d0d9b3400d

These files are failing with this error so far, I am still in pathcing 
progress:
tools/qemu-xen-dir-remote/util/log.c
tools/qemu-xen-dir-remote/util/qemu-sockets.c
tools/qemu-xen-dir-remote/subprojects/dtc/libfdt/fdt_overlay.c
tools/qemu-xen-dir-remote/gdbstub/gdbstub.c
tools/qemu-xen-dir-remote/block/vmdk.c
tools/qemu-xen-dir-remote/block/vvfat.c:
tools/qemu-xen-dir-remote/ui/ui-hmp-cmds.c
tools/qemu-xen-dir-remote/backends/tpm/tpm_passthrough.c

Best regards,
Kelly.
--
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