From 57a724e80f0a4dc5aee8b8c6bad93187dd632c09 Mon Sep 17 00:00:00 2001
From: Andrej730 <azhilenkov@gmail.com>
Date: Thu, 20 Nov 2025 16:55:19 +0500
Subject: [PATCH] FindCGAL.cmake

---
 cmake/CMakeLists.txt | 24 +-----------------------
 cmake/FindCGAL.cmake | 42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 23 deletions(-)
 create mode 100644 cmake/FindCGAL.cmake

diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index a0af8835ce..7cd439b7df 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -206,12 +206,6 @@ if(NOT MINIMAL_BUILD)
     UNIFY_ENVVARS_AND_CACHE(PYTHON_INCLUDE_DIR)
     UNIFY_ENVVARS_AND_CACHE(PYTHON_LIBRARY)
     UNIFY_ENVVARS_AND_CACHE(PYTHON_EXECUTABLE)
-    UNIFY_ENVVARS_AND_CACHE(CGAL_INCLUDE_DIR)
-    UNIFY_ENVVARS_AND_CACHE(CGAL_LIBRARY_DIR)
-    UNIFY_ENVVARS_AND_CACHE(GMP_INCLUDE_DIR)
-    UNIFY_ENVVARS_AND_CACHE(GMP_LIBRARY_DIR)
-    UNIFY_ENVVARS_AND_CACHE(MPFR_INCLUDE_DIR)
-    UNIFY_ENVVARS_AND_CACHE(MPFR_LIBRARY_DIR)
 endif()
 
 # Get a list of all OPTION flags from the CMakeLists.txt
@@ -223,28 +217,12 @@ foreach(option_flag IN LISTS option_flags)
 endforeach()
 
 if(WITH_CGAL)
-    if(NOT CGAL_INCLUDE_DIR)
-	# CGAL is not respecting default Boost_USE_STATIC_LIBS value
-	# and sometiems it's getting in the way.
-	if(NOT DEFINED Boost_USE_STATIC_LIBS)
-		set(CGAL_Boost_USE_STATIC_LIBS OFF)
-	else()
-		set(CGAL_Boost_USE_STATIC_LIBS "${Boost_USE_STATIC_LIBS}")
-	endif()
     find_package(CGAL REQUIRED)
-        if(NOT CGAL_DIR)
-            message(
-                FATAL_ERROR
-                "CGAL_SUPPORT enabled, but CGAL_INCLUDE_DIR wasn't provided and CGAL package couldn't be found."
-            )
-        endif()
-        message(STATUS "CGAL: found config at '${CGAL_DIR}'.")
+    if(TARGET CGAL::CGAL)
         link_libraries(CGAL::CGAL)
     endif()
-
     add_definitions(-DIFOPSH_WITH_CGAL)
     set(SWIG_DEFINES ${SWIG_DEFINES} -DIFOPSH_WITH_CGAL)
-
     list(APPEND GEOMETRY_KERNELS cgal)
 endif()
 
diff --git a/cmake/FindCGAL.cmake b/cmake/FindCGAL.cmake
new file mode 100644
index 0000000000..caf13ec791
--- /dev/null
+++ b/cmake/FindCGAL.cmake
@@ -0,0 +1,42 @@
+#
+# Input variables:
+# - `CGAL_INCLUDE_DIR`
+# - `CGAL_LIBRARY_DIR`
+# - `GMP_INCLUDE_DIR`
+# - `GMP_LIBRARY_DIR`
+# - `MPFR_INCLUDE_DIR`
+# - `MPFR_LIBRARY_DIR`
+# If input variables are not specified, try to find HDF5 config.
+# Input variables could also be provided as environment variables.
+#
+# Output variables:
+# - `CGAL_INCLUDE_DIR`
+#
+
+UNIFY_ENVVARS_AND_CACHE(CGAL_INCLUDE_DIR)
+UNIFY_ENVVARS_AND_CACHE(CGAL_LIBRARY_DIR)
+UNIFY_ENVVARS_AND_CACHE(GMP_INCLUDE_DIR)
+UNIFY_ENVVARS_AND_CACHE(GMP_LIBRARY_DIR)
+UNIFY_ENVVARS_AND_CACHE(MPFR_INCLUDE_DIR)
+UNIFY_ENVVARS_AND_CACHE(MPFR_LIBRARY_DIR)
+
+if(NOT CGAL_INCLUDE_DIR)
+    # CGAL is not respecting default Boost_USE_STATIC_LIBS value
+    # and sometiems it's getting in the way.
+    if(NOT DEFINED Boost_USE_STATIC_LIBS)
+        set(CGAL_Boost_USE_STATIC_LIBS OFF)
+    else()
+        set(CGAL_Boost_USE_STATIC_LIBS "${Boost_USE_STATIC_LIBS}")
+    endif()
+    find_package(CGAL CONFIG REQUIRED)
+    if(NOT CGAL_DIR)
+        message(
+            FATAL_ERROR
+            "CGAL_SUPPORT enabled, but CGAL_INCLUDE_DIR wasn't provided and CGAL package couldn't be found."
+        )
+    endif()
+    message(STATUS "CGAL: found config at '${CGAL_DIR}'.")
+endif()
+
+add_definitions(-DIFOPSH_WITH_CGAL)
+set(SWIG_DEFINES ${SWIG_DEFINES} -DIFOPSH_WITH_CGAL)