From 5b86eedb26f04d3950cede9ee46426feea6e1779 Mon Sep 17 00:00:00 2001
From: Andrej730 <azhilenkov@gmail.com>
Date: Fri, 20 Feb 2026 14:40:37 +0500
Subject: [PATCH] cmake - fix ifc geom mapping not linking against IfcGeom
 library

---
 src/ifcgeom/mapping/CMakeLists.txt | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/ifcgeom/mapping/CMakeLists.txt b/src/ifcgeom/mapping/CMakeLists.txt
index 4e185b9fa9..6369b98b60 100644
--- a/src/ifcgeom/mapping/CMakeLists.txt
+++ b/src/ifcgeom/mapping/CMakeLists.txt
@@ -1,12 +1,21 @@
 find_package(Eigen3 REQUIRED)
 
+# When using `ENABLE_BUILD_OPTIMIZATIONS``/GL` compilation flags makes resulting mapping libs huge (e.g. 1.5GB each)
+# and combining them together to a single IfcGeom won't be possible due to 4GB file size limit.
+# So in this case we have to ensure each mapping is built as separate libs instead of .obj files to be linked together.
+if(ENABLE_BUILD_OPTIMIZATIONS AND MSVC)
+    set(mapping_library_type "STATIC")
+else()
+    set(mapping_library_type "OBJECT")
+endif()
+
 foreach(schema ${SCHEMA_VERSIONS})
     file(GLOB IFCGEOM_I_FILES *.i)
     file(GLOB IFCGEOM_H_FILES *.h)
     file(GLOB IFCGEOM_CPP_FILES *.cpp)
     set(IFCGEOM_FILES ${IFCGEOM_CPP_FILES} ${IFCGEOM_H_FILES} ${IFCGEOM_I_FILES})
 
-    add_library(geometry_mapping_ifc${schema} OBJECT ${IFCGEOM_FILES})
+    add_library(geometry_mapping_ifc${schema} ${mapping_library_type} ${IFCGEOM_FILES})
     set_target_properties(
         geometry_mapping_ifc${schema}
         PROPERTIES COMPILE_FLAGS "-DIFC_GEOM_EXPORTS -DIfcSchema=Ifc${schema}"