From a973ce9afffbb98bb351819b58f3557d31ed0e5a Mon Sep 17 00:00:00 2001
From: Tobias Gloth <tobias.gloth@3dsystems.com>
Date: Sat, 30 May 2026 04:51:31 -0400
Subject: [PATCH] use /bigobj when building Eigen with MSVC (#13922)

---
 deps/Eigen/Eigen.cmake | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/deps/Eigen/Eigen.cmake b/deps/Eigen/Eigen.cmake
index ed87582b16..599976debb 100644
--- a/deps/Eigen/Eigen.cmake
+++ b/deps/Eigen/Eigen.cmake
@@ -1,5 +1,11 @@
+set(_eigen_extra_flags "")
+if (MSVC)
+    set(_eigen_extra_flags "-DCMAKE_CXX_FLAGS:STRING=/bigobj")
+endif ()
+
 orcaslicer_add_cmake_project(Eigen
     URL https://gitlab.com/libeigen/eigen/-/archive/5.0.1/eigen-5.0.1.zip
     URL_HASH SHA256=0dbb1f9e3aaad66f352c03227d8c983f6f0b49e0b07e71a7300f4abcc01aee12
+    CMAKE_ARGS "${_eigen_extra_flags}"
     DEPENDS dep_Boost dep_GMP dep_MPFR
 )