Merge branch 'py_cleanup' into 'master'

Add and execute script to clean stale files from build area

See merge request !468

Build/AtlasCMake/modules/AtlasFunctions.cmake

@@ -301,6 +301,13 @@ function( atlas_project name version )
    unset( _thisFile )
    unset( _thisDir )
 
+   # Cleanup stale files in build area:
+   find_program( _cleanupCmd cleanBuildArea.sh
+      PATH_SUFFIXES scripts PATHS ${CMAKE_MODULE_PATH} )
+   message( STATUS "Cleaning stale files from build area" )
+   execute_process( COMMAND ${_cleanupCmd} ${CMAKE_BINARY_DIR}/${ATLAS_PLATFORM}
+      OUTPUT_QUIET ERROR_QUIET )
+
    # Set up the "atlas_tests" target. One that all of the unit test builds
    # will depend on. This target will either be built by default or not based
    # on the value of the ATLAS_ALWAYS_BUILD_TESTS configuration option.

Build/AtlasCMake/modules/scripts/cleanBuildArea.sh

+#!/bin/bash
+#
+# Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
+#
+# Script to delete stale files from the build area that could be left over from
+# a previous build. Typically this happens when source files (or entire packages)
+# are removed between incremental builds.
+#
+
+# Make sure that we received the right number of arguments:
+if [ "$#" -ne 1 ]; then
+    echo "Syntax: cleanupBuildArea.sh BINARY_DIR"
+    exit 1
+fi
+
+binary_dir=$1
+
+# Find list of all .py[c] files
+pyc_files=`find $binary_dir/python -name '*.pyc' | sort`
+py_files=`find -L $binary_dir/python -name '*.py' -type f | sort`
+
+# Delete .pyc files without corresponding source file
+comm -23 --nocheck-order \
+     <(echo "$pyc_files") \
+     <(echo "$py_files" | sed 's/\.py$/\.pyc/') \
+    | xargs rm -f