Adding code

cmake/CPM.cmake

@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: MIT
+#
+# SPDX-FileCopyrightText: Copyright (c) 2019-2023 Lars Melchior and contributors
+
+set(CPM_DOWNLOAD_VERSION 0.38.7)
+set(CPM_HASH_SUM "83e5eb71b2bbb8b1f2ad38f1950287a057624e385c238f6087f94cdfc44af9c5")
+
+if(CPM_SOURCE_CACHE)
+  set(CPM_DOWNLOAD_LOCATION "${CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+elseif(DEFINED ENV{CPM_SOURCE_CACHE})
+  set(CPM_DOWNLOAD_LOCATION "$ENV{CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+else()
+  set(CPM_DOWNLOAD_LOCATION "${CMAKE_BINARY_DIR}/cmake/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+endif()
+
+# Expand relative path. This is important if the provided path contains a tilde (~)
+get_filename_component(CPM_DOWNLOAD_LOCATION ${CPM_DOWNLOAD_LOCATION} ABSOLUTE)
+
+file(DOWNLOAD
+     https://github.com/cpm-cmake/CPM.cmake/releases/download/v${CPM_DOWNLOAD_VERSION}/CPM.cmake
+     ${CPM_DOWNLOAD_LOCATION} EXPECTED_HASH SHA256=${CPM_HASH_SUM}
+)
+
+include(${CPM_DOWNLOAD_LOCATION})

cmake/gtest.cmake

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+cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
+
+#-----------------------------------------------------------------------
+# CPM configuration
+#-----------------------------------------------------------------------
+set(CPM_MODULE_NAME google_test)
+set(CPM_LIB_TARGET_NAME ${CPM_MODULE_NAME})
+
+if ((DEFINED CPM_DIR) AND (DEFINED CPM_UNIQUE_ID) AND (DEFINED CPM_TARGET_NAME))
+    set(CPM_LIB_TARGET_NAME ${CPM_TARGET_NAME})
+    set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CPM_DIR})
+    include(CPM)
+else()
+    set(CPM_DIR "${CMAKE_CURRENT_BINARY_DIR}/cpm-packages" CACHE TYPE STRING)
+    find_package(Git)
+    if(NOT GIT_FOUND)
+        message(FATAL_ERROR "CPM requires Git.")
+    endif()
+    if (NOT EXISTS ${CPM_DIR}/CPM.cmake)
+        execute_process(
+                COMMAND "${GIT_EXECUTABLE}" clone https://github.com/iauns/cpm ${CPM_DIR}
+                RESULT_VARIABLE error_code
+                OUTPUT_VARIABLE head_sha)
+        if(error_code)
+            message(FATAL_ERROR "CPM failed to get the hash for HEAD")
+        endif()
+    endif()
+    include(${CPM_DIR}/CPM.cmake)
+endif()
+
+# All externals *must* define this.
+CPM_ForceOnlyOneModuleVersion()
+
+CPM_InitModule(${CPM_MODULE_NAME})
+
+#------------------------------------------------------------------------------
+# Google Test
+#------------------------------------------------------------------------------
+# Google test as an external project is a bad idea! You really should add it
+# as a subdirectory so that it can capture your compiler flags
+set(GOOGLE_TEST_DIR ${CMAKE_CURRENT_SOURCE_DIR}/3rdParty/gtest)
+CPM_EnsureRepoIsCurrent(
+        TARGET_DIR ${GOOGLE_TEST_DIR}
+        SVN_REPOSITORY "http://googletest.googlecode.com/svn/trunk"
+        SVN_REVISION "664"
+        USE_CACHING TRUE
+)
+
+# Compiler flags for MSVC 2010
+if (MSVC_VERSION EQUAL 1600)
+    add_definitions(-DGTEST_USE_OWN_TR1_TUPLE=0)
+    CPM_ExportAdditionalDefinition("-DGTEST_USE_OWN_TR1_TUPLE=0")
+endif()
+
+# Compiler flags for MSVC 2012
+if(MSVC_VERSION EQUAL 1700)
+    add_definitions(-D_VARIADIC_MAX=10)
+endif()
+
+# For All versions of gtest, we force shared CRT.
+set(gtest_force_shared_crt ON)
+set(gtest_force_shared_crt ON)
+
+# Add gtest now that we have the appropriate flags set.
+add_subdirectory(${GOOGLE_TEST_DIR})
+
+CPM_ExportAdditionalIncludeDir("${GOOGLE_TEST_DIR}/include")
+CPM_ExportAdditionalLibraryTarget("gtest")