// started doing builds with gcc-12.3-1 today, first was xen-4.18~rc1

[mockbuild@mock ~]$ rpm -qi --requires gcc-toolset-12-gcc
Name        : gcc-toolset-12-gcc
Version     : 12.3.1
Release     : 7.4.el9
Architecture: x86_64
Install Date: Tue 10 Oct 2023 01:48:21 PM PDT
Group       : Unspecified
Size        : 130716726
License     : GPLv3+ and GPLv3+ with exceptions and GPLv2+ with exceptions and LGPLv2+ and BSD
Signature   : (none)
Source RPM  : gcc-toolset-12-gcc-12.3.1-7.4.el9.src.rpm
Build Date  : Mon 09 Oct 2023 08:21:28 AM PDT
Build Host  : cs9min
Packager    : "Mark Pryor <pryorm09@gmail.com>"
URL         : http://gcc.gnu.org
Summary     : GCC version 12
Description :
The gcc-toolset-12-gcc package contains the GNU Compiler Collection version 10.
/bin/sh
gcc-toolset-12-binutils >= 2.22.52.0.1
gcc-toolset-12-runtime
gcc-toolset-12-runtime
glibc-devel >= 2.2.90-12
ld-linux-x86-64.so.2()(64bit)
ld-linux-x86-64.so.2(GLIBC_2.3)(64bit)
libc.so.6()(64bit)
libc.so.6(GLIBC_2.11)(64bit)
libc.so.6(GLIBC_2.14)(64bit)
libc.so.6(GLIBC_2.2.5)(64bit)
libc.so.6(GLIBC_2.25)(64bit)
libc.so.6(GLIBC_2.3)(64bit)
libc.so.6(GLIBC_2.3.3)(64bit)
libc.so.6(GLIBC_2.32)(64bit)
libc.so.6(GLIBC_2.33)(64bit)
libc.so.6(GLIBC_2.34)(64bit)
libc.so.6(GLIBC_2.4)(64bit)
libc.so.6(GLIBC_2.7)(64bit)
libc.so.6(GLIBC_2.9)(64bit)
libgcc >= 4.1.2-43
libgmp.so.10()(64bit)
libgomp >= 4.4.4-13
libm.so.6()(64bit)
libm.so.6(GLIBC_2.2.5)(64bit)
libmpc.so.3()(64bit)
libmpfr.so.6()(64bit)
libz.so.1()(64bit)
libzstd.so.1()(64bit)
make
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PartialHardlinkSets) <= 4.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsZstd) <= 5.4.18-1
rtld(GNU_HASH)

<mock-chroot> sh-5.1# su - mockbuild
Last login: Tue Oct 10 14:31:34 PDT 2023
[mockbuild@mock ~]$ ls -al build/RPMS/
total 33984
drwxrwxr-x 2 mockbuild mockbuild     4096 Oct 10 14:03 .
drwxrwxr-x 9 mockbuild mockbuild     4096 Oct 10 13:51 ..
-rw-rw-r-- 1 mockbuild mockbuild   909049 Oct 10 14:03 qemut-0.10.2+rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild 23096861 Oct 10 14:04 qemuu-8.0.4+rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild  1442125 Oct 10 14:03 qemuu-img-8.0.4+rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild   246453 Oct 10 14:03 qemuu-uncom-8.0.4+rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild   156741 Oct 10 14:03 xen-4.18~rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild   299553 Oct 10 14:03 xen-devel-4.18~rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild   376045 Oct 10 14:03 xen-doc-4.18~rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild  3756413 Oct 10 14:03 xen-hypervisor-4.18~rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild   605221 Oct 10 14:03 xen-libs-4.18~rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild    68045 Oct 10 14:03 xen-licenses-4.18~rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild   559073 Oct 10 14:03 xen-ocaml-4.18~rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild   117689 Oct 10 14:03 xen-ocaml-devel-4.18~rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild  3060389 Oct 10 14:03 xen-runtime-4.18~rc1-2.el9.x86_64.rpm
-rw-rw-r-- 1 mockbuild mockbuild    68889 Oct 10 14:03 xenstore-guest-utils-4.18~rc1-2.el9.x86_64.rpm