[rpms/llvm] rawhide: Disable PGO and LTO on s390x on LLVM >= 23

[rpms/llvm] rawhide: Disable PGO and LTO on s390x on LLVM >= 23

[Tulio Magno Quites Machado Filho]

            A new commit has been pushed.

            Repo   : rpms/llvm
            Branch : rawhide
            Commit : 2e159bf903f5288d8826a03d887489254182f0b9
            Author : Tulio Magno Quites Machado Filho <tuliom@redhat.com>
            Date   : 2026-06-30T11:52:15-03:00
            Stats  : +11/-0 in 1 file(s)
            URL    : https://src.fedoraproject.org/rpms/llvm/c/2e159bf903f5288d8826a03d887489254182f0b9?branch=rawhide

            Log:
            Disable PGO and LTO on s390x on LLVM >= 23

For the past few months, s390x builds on Fedora have been taking a
little bit more than 12 hours. Considering a 9h work day, that always
means waiting an extra business day in order to review the results of
the tests.
This long build time is causing us to adopt bad practices: we reduce
the number of testing builds we could run in order to not wait so long,
we merge PRs manually in order to not wait for another scratch build
or we simply stop testing on s390x unless that's really mandatory.

This also causes trouble for daily snapshots whose builds are reviewed
only 1 business day after the build started.

PGO has also caused issues a couple of months ago due to the high disk
usage. s390x Koji builders have 134GiB of storage and LLVM builds are
getting close to that storage usage.

CentOS and RHEL are not impacted by this, though. Their s390x builders
are larger and they also build less features than Fedora. However, in
order to benefit from the tests run on Fedora, this commit disables PGO
and LTO on s390x on CentOS and RHEL too.

---
diff --git a/llvm.spec b/llvm.spec
index e241abc..31dc3ac 100644
--- a/llvm.spec
+++ b/llvm.spec
@@ -188,12 +188,18 @@ end
 %ifarch %{ix86}
 %bcond_with pgo
 %else
+# Disable PGO on s390x temporarily in order to reduce LLVM build time and
+# disk usage.
+%if %{maj_ver} >= 23 && "%{_arch}" == "s390x"
+%bcond_with pgo
+%else
 %if 0%{?fedora} >= 43 || 0%{?rhel} >= 9
 %bcond_without pgo
 %else
 %bcond_with pgo
 %endif
 %endif
+%endif
 
 # Sanity checks for PGO and bootstrapping
 #----------------------------------------
@@ -209,6 +215,10 @@ end
 %ifarch %ix86 riscv64
 %bcond_with lto_build
 %else
+# Disable LTO on s390x in order to reduce LLVM build time.
+%if %{maj_ver} >= 23 && "%{_arch}" == "s390x"
+%bcond_with pgo
+%else
 %if %{defined rhel} && 0%{?rhel} <= 8
 # LTO builds got enabled on Fedora and RHEL >= 9 only.
 %bcond_with lto_build
@@ -216,6 +226,7 @@ end
 %bcond_without lto_build
 %endif
 %endif
+%endif
 
 
 %if 0%{?rhel} == 8