qemu 1:6.0+dfsg-2expubuntu2: Fail to build against OpenSSL 3.0

[Paride Legovini]

Issue discovered after doing a "No-change rebuild" upload to Jammy while working at the liburing2 migration (LP: #1944037).

Full build log:

https://launchpadlibrarian.net/570888790/buildlog_ubuntu-jammy-amd64.qemu_1%3A6.0+dfsg-2expubuntu3_BUILDING.txt.gz

Failure mode:

/<<BUILDDIR>>/qemu-6.0+dfsg/roms/skiboot/libstb/create-container.c: In function ‘getPublicKeyRaw’:
/<<BUILDDIR>>/qemu-6.0+dfsg/roms/skiboot/libstb/create-container.c:85:17: error: ‘EVP_PKEY_get1_EC_KEY’ is deprecated: Since OpenSSL 3.0 [-Werror=deprecated-declarations]

Also note that:

cc1: all warnings being treated as errors

Upstream skiboot [1] still uses EVP_PKEY_get1_EC_KEY in master, and don't have an open issue about this. To be filed once we setup a reproducer that builds skiboot "standalone", outside of the qemu source tree.

For the moment we have to relax the severity of that deprecation error, likely appending a -Wno-deprecated-declarations somewhere in d/rules.

[1] https://github.com/open-power/skiboot

[Christian Ehrhardt  (paelzer)]

Messing around with someone elses crypto functions rarely is good ;-)
So I reported it Upstream at the skiboot project as:
=> https://github.com/open-power/skiboot/issues/271

[Launchpad Janitor (janitor)]

This bug was fixed in the package qemu - 1:6.0+dfsg-2expubuntu4

---------------
qemu (1:6.0+dfsg-2expubuntu4) jammy; urgency=medium

  * d/p/lp-1952448-relax-skiboot-gcc-deprecation-errors.patch:
    add patch to workaround FTBFS when building against OpenSSL 3.0.
    Thanks to Christian Ehrhardt (LP: #1952448)

 -- Paride Legovini <email address hidden> Fri, 26 Nov 2021 15:47:51 +0100