--- src/core/CMakeLists.txt.orig	2020-08-14 12:07:53 UTC
+++ src/core/CMakeLists.txt
@@ -894,6 +894,7 @@ ELSE(MSVC)
   SET_SOURCE_FILES_PROPERTIES(${QGIS_CORE_MOC_SRCS} PROPERTIES COMPILE_FLAGS "-Wno-deprecated-declarations" )
   IF ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" AND (CMAKE_BUILD_TYPE MATCHES Release OR CMAKE_BUILD_TYPE MATCHES RelWithDebInfo))
     SET_SOURCE_FILES_PROPERTIES(${CMAKE_CURRENT_BINARY_DIR}/qgsexpression_texts.cpp PROPERTIES COMPILE_FLAGS "-O1")
+    SET_SOURCE_FILES_PROPERTIES(qgscoordinatereferencesystem.cpp PROPERTIES COMPILE_FLAGS "-mllvm -inline-threshold=128")
   ENDIF ()
 ENDIF(MSVC)