From b0d3bf4ddfbf47f239b8b09581afee5dbbe99820 Mon Sep 17 00:00:00 2001
From: Michael Fisher <880111+mfisher31@users.noreply.github.com>
Date: Tue, 14 May 2024 23:25:15 -0400
Subject: [PATCH] [build] cmake: add absl dependency for newer protobuf (#6609)

Works around a bug on some systems where protobuf does not correctly depend on required absl libraries.
---
 wpiutil/CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/wpiutil/CMakeLists.txt b/wpiutil/CMakeLists.txt
index b4482ff048a..32ce9fa537a 100644
--- a/wpiutil/CMakeLists.txt
+++ b/wpiutil/CMakeLists.txt
@@ -159,6 +159,11 @@ endif()
 wpilib_target_warnings(wpiutil)
 target_link_libraries(wpiutil protobuf::libprotobuf Threads::Threads ${CMAKE_DL_LIBS})
 
+if(Protobuf_VERSION VERSION_GREATER_EQUAL 4)
+    find_package(absl REQUIRED)
+    target_link_libraries(wpiutil absl::spinlock_wait)
+endif()
+
 if(ATOMIC)
     target_link_libraries(wpiutil ${ATOMIC})
 endif()