Use a script to clean-up custom-target output dirs

The script will manually delete all custom_target outputs that are
directories instead of files. This is needed because on platforms other
than Windows, Ninja only deletes directories while cleaning if they are
empty.

Closes #1220

1 files changed, 9 insertions, 0 deletions

diff --git a/mesonbuild/backend/backends.py b/mesonbuild/backend/backends.py
index 8b6d181..bc61c96 100644
--- a/mesonbuild/backend/backends.py
+++ b/mesonbuild/backend/backends.py
@@ -22,6 +22,15 @@ import json
 import subprocess
 from ..mesonlib import MesonException, get_compiler_for_source, classify_unity_sources
 
+class CleanTrees():
+    '''
+    Directories outputted by custom targets that have to be manually cleaned
+    because on Linux `ninja clean` only deletes empty directories.
+    '''
+    def __init__(self, build_dir, trees):
+        self.build_dir = build_dir
+        self.trees = trees
+
 class InstallData():
     def __init__(self, source_dir, build_dir, prefix):
         self.source_dir = source_dir