From c956fce0644196830be1461c639f586ce93393ef Mon Sep 17 00:00:00 2001
From: Nikita Popov <npopov@redhat.com>
Date: Tue, 16 Jul 2024 10:45:51 +0000
Subject: [PATCH] Undefine __cmake_in_source_build on RHEL 8

So we get the same behavior as in newer versions.
---
 build.spec.inc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/build.spec.inc b/build.spec.inc
index a7dc2d7..a579317 100644
--- a/build.spec.inc
+++ b/build.spec.inc
@@ -31,6 +31,10 @@ export LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:`pwd`/llvm/%{_vpath_builddir}/%{_lib}
 
 cd llvm
 
+%if 0%{?rhel} == 8
+%undefine __cmake_in_source_build
+%endif
+
 # TODO(kkleine): Follow more closely the Distribution guidelines found here: https://llvm.org/docs/BuildingADistribution.html
 # force off shared libs as cmake macros turns it on.
 # TODO: Disable LLVM_UNREACHABLE_OPTIMIZE.