renames

modules/safeguards.cmake

@@ -0,0 +1,19 @@
+function(guard_against_in_source in_source_dir in_binary_dir)
+    if(${in_source_dir} STREQUAL ${in_binary_dir})
+        message(FATAL_ERROR "In-source builds not allowed. Please make a new directory (called a build directory) and run CMake from there.")
+    endif()
+endfunction()
+
+function(guard_against_bad_build_types in_build_type)
+    string(TOLOWER "${in_build_type}" cmake_build_type_tolower)
+    string(TOUPPER "${in_build_type}" cmake_build_type_toupper)
+
+    if(    NOT cmake_build_type_tolower STREQUAL "debug"
+       AND NOT cmake_build_type_tolower STREQUAL "release"
+       AND NOT cmake_build_type_tolower STREQUAL "relwithdebinfo")
+        message(FATAL_ERROR "Unknown build type \"${in_build_type}\". Allowed values are Debug, Release, RelWithDebInfo (case-insensitive).")
+    endif()
+endfunction()
+
+guard_against_in_source(${PROJECT_SOURCE_DIR} ${PROJECT_BINARY_DIR})
+guard_against_bad_build_types(${CMAKE_BUILD_TYPE})