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Clang should use ld from the same gcc-toolset used for the --gcc-toolchain.

    echo "int main() {}" > test.c
    clang -### test.c

should print something like

    "/opt/rh/gcc-toolset-12/root/usr/lib/gcc/x86_64-redhat-linux/12/../../../../bin/ld" [...]

as the last command, rather than

    "/usr/bin/ld" [...]

Using the system ld causes "too many open files" and similar errors when using clang with LTO on projects with many objects.

clang-16.0.1-3.el9 build made it through the gating. Tested that clang now uses the ld from gcc toolset as shown in the description:

* s390x:
[root@ibm-z-537 ~]# clang -### test.c |& grep bin/ld | awk '{print $1}'
"/opt/rh/gcc-toolset-12/root/usr/lib/gcc/s390x-redhat-linux/12/../../../../bin/ld"

* aarch64:
[root@ampere-mtsnow-altramax-01-vm-09 ~]# clang -### test.c |& grep bin/ld | awk '{print $1}'
"/opt/rh/gcc-toolset-12/root/usr/lib/gcc/aarch64-redhat-linux/12/../../../../bin/ld"

* ppc64le:
[root@ibm-p9z-26-lp14 ~]# clang -### test.c |& grep bin/ld | awk '{print $1}'
"/opt/rh/gcc-toolset-12/root/usr/lib/gcc/ppc64le-redhat-linux/12/../../../../bin/ld"

* x86_64:
[root@jchecahi-1mt-rhel-9 ~]# clang -### test.c |& grep bin/ld | awk '{print $1}'
"/opt/rh/gcc-toolset-12/root/usr/lib/gcc/x86_64-redhat-linux/12/../../../../bin/ld"

Setting Verified:Tested.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (python-lit, lldb, lld, libomp, compiler-rt, clang, and llvm update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:6360