Move handling of default build type to separate file

CMakeLists.txt

@@ -32,18 +32,7 @@ if (DEFINED NetlibF2C_SHARED_LIBS)
     set(BUILD_SHARED_LIBS "${NetlibF2C_SHARED_LIBS}")
 endif ()
 
-# NetlibF2C is a third-party tool and library, which we rarely want to debug.
-# Set the default build type to Release.
-# If using a multi config generator
-get_property(_IS_MULTI_CONFIG GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
-if (_IS_MULTI_CONFIG)
-    set(CMAKE_DEFAULT_BUILD_TYPE "Release")
-# If using a single config generator
-else ()
-    if (NOT DEFINED CMAKE_BUILD_TYPE)
-        set(CMAKE_BUILD_TYPE "Release")
-    endif ()
-endif ()
+include("./cmake/SetDefaultBuildType.cmake")
 
 if (BUILD_SHARED_LIBS)
     include(CheckPIESupported)

cmake/SetDefaultBuildType.cmake

+#[[
+CMake build script for netlib f2c
+Copyright (C) 2025  Tim Kaune
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this program.  If not, see
+<https://www.gnu.org/licenses/>.
+]]
+
+# If using a multi config generator
+get_property(_IS_MULTI_CONFIG GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+
+if (_IS_MULTI_CONFIG)
+    set(CMAKE_DEFAULT_BUILD_TYPE "Release")
+# If using a single config generator
+else ()
+    if (NOT DEFINED CMAKE_BUILD_TYPE)
+        set(CMAKE_BUILD_TYPE "Release")
+    endif ()
+endif ()