update

utils.cmake

@@ -118,6 +118,12 @@ function(setup_project)
     if(PROJ_ARGS_UNPARSED_ARGUMENTS)
         message(AUTHOR_WARNING "setup_project: Unrecognized arguments: ${PROJ_ARGS_UNPARSED_ARGUMENTS}")
     endif()
+    set(__in_source_build FALSE)
+    are_paths_equal(PROJECT_BINARY_DIR PROJECT_SOURCE_DIR __in_source_build)
+    if(__in_source_build)
+        message(FATAL_ERROR "In-source builds are not allowed. You must build this project out-of-source.")
+        return()
+    endif()
     # AUTOMOC include directory is a system include directory by default.
     if(POLICY CMP0151)
         cmake_policy(SET CMP0151 NEW)
@@ -298,8 +304,6 @@ function(setup_project)
     if(NOT DEFINED CMAKE_POSITION_INDEPENDENT_CODE)
         set(CMAKE_POSITION_INDEPENDENT_CODE ON PARENT_SCOPE)
     endif()
-    include(CheckPIESupported)
-    check_pie_supported() # This function must be called to ensure CMake adds -fPIE to the linker flags.
     if(NOT DEFINED CMAKE_VISIBILITY_INLINES_HIDDEN)
         set(CMAKE_VISIBILITY_INLINES_HIDDEN ON PARENT_SCOPE)
     endif()