From 3381f72b80b330bdd046341e85f45fec2d35ad36 Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Wed, 29 Sep 2021 09:19:47 -0400
Subject: [PATCH] correctly handle Tcl stub library if available

---
 tools/swig/CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/swig/CMakeLists.txt b/tools/swig/CMakeLists.txt
index b3397c5dc9..966837dc2f 100644
--- a/tools/swig/CMakeLists.txt
+++ b/tools/swig/CMakeLists.txt
@@ -94,6 +94,11 @@ if(BUILD_SWIG_TCL)
   if(NOT TCL_FOUND)
     message(FATAL_ERROR "Tcl development headers and libraries are required")
   endif()
+  find_package(TclStub)
+  if(TCL_STUB_LIBRARY)
+    target_compile_definitions(tcllammps PRIVATE USE_TCL_STUBS)
+    target_link_libraries(tcllammps PRIVATE ${TCL_STUB_LIBRARY})
+  endif()
   target_include_directories(tcllammps PRIVATE ${TCL_INCLUDE_PATH})
   swig_link_libraries(tcllammps PRIVATE lammps ${TCL_LIBRARY})
   # build extended Tcl shell binary