fix: add include guard to all files

Index.cmake

@@ -1 +1,3 @@
+include_guard()
+
 include("${CMAKE_CURRENT_LIST_DIR}/src/Index.cmake")

src/Cache.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # Enable cache if available
 function(enable_cache)
   set(CACHE_OPTION

src/Common.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # Common project settings run by default for all the projects that call `project_options()`
 macro(common_project_options)
   include("${ProjectOptions_SRC_DIR}/PreventInSourceBuilds.cmake")

src/CompilerWarnings.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # Set the compiler warnings
 #
 # https://clang.llvm.org/docs/DiagnosticsReference.html

src/Conan.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # Run Conan for dependency management
 macro(run_conan)
   # Download automatically, you can also just copy the conan.cmake file

src/Cuda.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # ! target_link_cuda
 # A function that links Cuda to the given target
 #

src/Doxygen.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # Enable doxygen doc builds of source
 function(enable_doxygen DOXYGEN_THEME)
   # If not specified, use the top readme file as the first page

src/DynamicProjectOptions.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # ENABLE_DEVELOPER_MODE: sets defaults appropriate for developers, this is defaulted to ON
 #  * WARNINGS_AS_ERRORS: ON
 #  * ENABLE_SANITIZER_ADDRESS: ON

src/Index.cmake

@@ -1,5 +1,7 @@
 cmake_minimum_required(VERSION 3.16)
 
+include_guard()
+
 set(ProjectOptions_SRC_DIR
     ${CMAKE_CURRENT_LIST_DIR}
     CACHE FILEPATH "")

src/Linker.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # TODO use function arguments instead of CMake cache variables and options
 
 # Set the linker to use for the linking phase

src/Optimization.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 macro(enable_interprocedural_optimization project_name)
   if(CMAKE_BUILD_TYPE STREQUAL "Release" OR CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
     include(CheckIPOSupported)

src/PackageProject.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # Uses ycm (permissive BSD-3-Clause license) and ForwardArguments (permissive MIT license)
 
 # A function that packages the project for external usage (e.g. from vcpkg, Conan, etc).

src/PreventInSourceBuilds.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 #
 # This function will prevent in-source builds
 #

src/Sanitizers.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 function(
   enable_sanitizers
   project_name

src/Standards.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # Set the default copmiler standards if not specified
 macro(set_standards)
 

src/StaticAnalyzers.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # Enable static analysis with Cppcheck
 macro(enable_cppcheck CPPCHECK_OPTIONS)
   find_program(CPPCHECK cppcheck)

src/SystemLink.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # Include a system directory (which suppresses its warnings).
 function(target_include_system_directories target)
   set(multiValueArgs INTERFACE PUBLIC PRIVATE)

src/Tests.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # Enable coverage reporting for gcc/clang
 function(enable_coverage project_name)
   if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES ".*Clang")

src/Utilities.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 # find a subtring from a string by a given prefix such as VCVARSALL_ENV_START
 function(
   find_substring_by_prefix

src/VCEnvironment.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 include("${ProjectOptions_SRC_DIR}/Utilities.cmake")
 
 # Run vcvarsall.bat and set CMake environment variables

src/Vcpkg.cmake

@@ -1,3 +1,5 @@
+include_guard()
+
 include(FetchContent)
 
 # Install vcpkg and vcpkg dependencies: - should be called before defining project()