From 2e30a8c2e4c898ed3abd5152631a3a6aecc92b3d Mon Sep 17 00:00:00 2001
From: Lars Bilke <lars.bilke@ufz.de>
Date: Tue, 23 Apr 2024 17:34:15 +0200
Subject: [PATCH] [cmake] Define USE_MKL on source scope only.

---
 MathLib/CMakeLists.txt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/MathLib/CMakeLists.txt b/MathLib/CMakeLists.txt
index ca6bd559cd4..5b2627c59b2 100644
--- a/MathLib/CMakeLists.txt
+++ b/MathLib/CMakeLists.txt
@@ -57,8 +57,13 @@ target_compile_definitions(
         $<$<BOOL:${OGS_EIGEN_INITIALIZE_MATRICES_BY_NAN}>:EIGEN_INITIALIZE_MATRICES_BY_NAN>
         $<$<CONFIG:Debug>:EIGEN_INITIALIZE_MATRICES_BY_NAN>
         $<$<AND:$<BOOL:${OGS_USE_MKL}>,$<BOOL:${OGS_EIGEN_USE_MKL}>>:EIGEN_USE_MKL_ALL>
-    PRIVATE $<$<BOOL:${OGS_USE_MKL}>:USE_MKL>
 )
+if(OGS_USE_MKL)
+    set_source_files_properties(
+        LinAlg/Eigen/EigenLinearSolver.cpp PROPERTIES COMPILE_DEFINITIONS
+                                                      USE_MKL
+    )
+endif()
 
 target_precompile_headers(
     MathLib PRIVATE [["BaseLib/Error.h"]] [["BaseLib/ConfigTree.h"]]
-- 
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