From f9274229c81d75ee4fbcc0fdbaf8fc86d1147902 Mon Sep 17 00:00:00 2001
From: Paul Gessinger <paul.gessinger@cern.ch>
Date: Tue, 12 Nov 2024 14:02:52 +0100
Subject: [PATCH] build: Make Boost 1.85 a hard failure when building the
 Examples (#3843)

In the Examples, we require UB-free boost for the event data model to work
---
 CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f5209e0d210..601264badc0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -290,8 +290,12 @@ if(ACTS_SETUP_BOOST)
     endif()
 
     if(Boost_VERSION VERSION_EQUAL "1.85.0")
+        set(_boost_version_severity WARNING)
+        if(ACTS_BUILD_EXAMPLES)
+            set(_boost_version_severity FATAL_ERROR)
+        endif()
         message(
-            WARNING
+            ${_boost_version_severity}
             "Boost 1.85.0 is known to be broken (https://github.com/boostorg/container/issues/273). Please use a different version."
         )
     endif()