From 9feeb3a36439fda169e466893e389b3ca66d90e1 Mon Sep 17 00:00:00 2001
From: Felix Schlepper <felix.schlepper@cern.ch>
Date: Tue, 24 Feb 2026 10:03:21 +0100
Subject: [PATCH] Add Eigen3 and GBL dependencies

Following https://github.com/alisw/alidist/pull/6137, this adds GBL and Eigen3 as dependencies.
---
 dependencies/O2Dependencies.cmake | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/dependencies/O2Dependencies.cmake b/dependencies/O2Dependencies.cmake
index 26f381a4ef79f..8addb87a1a16f 100644
--- a/dependencies/O2Dependencies.cmake
+++ b/dependencies/O2Dependencies.cmake
@@ -243,4 +243,25 @@ set_package_properties(absl PROPERTIES TYPE REQUIRED)
 find_package(Vtune)
 set_package_properties(Vtune PROPERTIES TYPE OPTIONAL)
 
+find_package(Eigen3 QUIET)
+if(NOT TARGET Eigen3::Eigen)
+    # The Eigen3 install only provides the header files, so 'mock' the cmake target
+    add_library(Eigen3::Eigen INTERFACE IMPORTED)
+    set_target_properties(Eigen3::Eigen PROPERTIES
+        INTERFACE_INCLUDE_DIRECTORIES "${EIGEN3_ROOT}/include/eigen3"
+    )
+endif()
+
+find_package(GBL)
+set_package_properties(GBL PROPERTIES TYPE REQUIRED)
+if(GBL_FOUND AND NOT TARGET GBL::GBL)
+    # As of now, GBL does not provide a cmake target so create a compatibility wrapper
+    add_library(GBL::GBL INTERFACE IMPORTED)
+    target_include_directories(GBL::GBL INTERFACE ${GBL_INCLUDE_DIR})
+    target_link_libraries(GBL::GBL INTERFACE
+        ${GBL_LIBRARIES}
+        Eigen3::Eigen
+    )
+endif()
+
 feature_summary(WHAT ALL FATAL_ON_MISSING_REQUIRED_PACKAGES)