From 41ba71b748ff7107f4d106d0611563172ca18e7d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Apitzsch?= <andre.apitzsch@etit.tu-chemnitz.de>
Date: Fri, 20 Oct 2023 10:08:38 +0200
Subject: [PATCH] build, core: remove code required for cmake versions < 3.12

With the raise of the minimal CMake version, this is no longer needed.
---
 build-support/macros-and-definitions.cmake | 34 +-------------------
 src/core/CMakeLists.txt                    | 36 +++-------------------
 2 files changed, 6 insertions(+), 64 deletions(-)

diff --git a/build-support/macros-and-definitions.cmake b/build-support/macros-and-definitions.cmake
index 51cb8873f52..ca3cadb8398 100644
--- a/build-support/macros-and-definitions.cmake
+++ b/build-support/macros-and-definitions.cmake
@@ -529,18 +529,6 @@ macro(process_options)
     if("${CLANG_TIDY}" STREQUAL "CLANG_TIDY-NOTFOUND")
       message(FATAL_ERROR "Clang-tidy was not found")
     else()
-      if((${CMAKE_VERSION} VERSION_LESS "3.12.0") AND ${NS3_CCACHE}
-         AND (NOT ("${CCACHE}" STREQUAL "CCACHE-NOTFOUND"))
-      )
-        # CMake <3.12 puts CMAKE_CXX_COMPILER_LAUNCHER in the incorrect place
-        # and CCache ends up being unable to cache anything if calling
-        # clang-tidy https://gitlab.kitware.com/cmake/cmake/-/issues/18266
-        message(
-          FATAL_ERROR
-            "The current CMake ${CMAKE_VERSION} won't ccache objects correctly when running with clang-tidy."
-            "Update CMake to at least version 3.12, or disable either ccache or clang-tidy to continue."
-        )
-      endif()
       set(CMAKE_CXX_CLANG_TIDY "${CLANG_TIDY}")
     endif()
   else()
@@ -893,27 +881,7 @@ macro(process_options)
   set(Python3_FOUND FALSE)
   set(Python3_INCLUDE_DIRS)
   if(${NS3_PYTHON_BINDINGS})
-    if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.12.0")
-      find_package(Python3 COMPONENTS Interpreter Development)
-    else()
-      # cmake-format: off
-      set(Python_ADDITIONAL_VERSIONS 3.6 3.7 3.8 3.9 3.10 3.11)
-      # cmake-format: on
-      find_package(PythonInterp)
-      find_package(PythonLibs)
-
-      # Move deprecated results into the FindPython3 resulting variables
-      set(Python3_Interpreter_FOUND ${PYTHONINTERP_FOUND})
-      set(Python3_Development_FOUND ${PYTHONLIBS_FOUND})
-      if(${PYTHONINTERP_FOUND})
-        set(Python3_EXECUTABLE ${PYTHON_EXECUTABLE})
-        set(Python3_FOUND TRUE)
-      endif()
-      if(${PYTHONLIBS_FOUND})
-        set(Python3_LIBRARIES ${PYTHON_LIBRARIES})
-        set(Python3_INCLUDE_DIRS ${PYTHON_INCLUDE_DIRS})
-      endif()
-    endif()
+    find_package(Python3 COMPONENTS Interpreter Development)
   else()
     # If Python was not set yet, use the version found by check_deps
     check_deps("" "python3" python3_deps)
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index db51d1b9f8a..d270835c773 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -14,38 +14,12 @@ if(${GSL_FOUND})
 endif()
 
 # Check for dependencies and add sources accordingly
-if(${CMAKE_VERSION}
-   VERSION_LESS
-   "3.11.0"
+check_include_files(
+  "boost/units/quantity.hpp;boost/units/systems/si.hpp"
+  HAVE_BOOST_UNITS
+  LANGUAGE
+  CXX
 )
-  check_include_file_cxx(
-    boost/units/quantity.hpp
-    HAVE_BOOST_UNITS_QUANTITY
-  )
-  check_include_file_cxx(
-    boost/units/systems/si.hpp
-    HAVE_BOOST_UNITS_SI
-  )
-  if(${HAVE_BOOST_UNITS_QUANTITY}
-     AND ${HAVE_BOOST_UNITS_SI}
-  )
-    set(HAVE_BOOST_UNITS
-        TRUE
-    )
-  else()
-    set(HAVE_BOOST_UNITS
-        FALSE
-    )
-  endif()
-else()
-  # Fast path for CMake >= 3.11
-  check_include_files(
-    "boost/units/quantity.hpp;boost/units/systems/si.hpp"
-    HAVE_BOOST_UNITS
-    LANGUAGE
-    CXX
-  )
-endif()
 
 if(${HAVE_BOOST_UNITS})
   add_definitions(