Add support for incremental builds

Implement a scheme from the C tools where symbols get corresponding
files that are touch'ed whenever the symbol's value changes. This can be
used to add e.g. Makefile dependencies between source files and
particular symbols.

See the docstring of the new sync_deps() function for more information.

Piggyback a small sanity check for write_autoconf().

1 files changed, 10 insertions, 0 deletions

diff --git a/testsuite.py b/testsuite.py
index da96075..db1b5f0 100644
--- a/testsuite.py
+++ b/testsuite.py
@@ -47,8 +47,10 @@ import errno
 import os
 import platform
 import re
+import shutil
 import subprocess
 import sys
+import tempfile
 import textwrap
 import time
 
@@ -1851,6 +1853,14 @@ def test_sanity(conf, arch, srcarch):
     conf.mainmenu_text
     conf.unset_values()
 
+    conf.write_autoconf("/dev/null")
+
+    # No tempfile.TemporaryDirectory in Python 2
+    tmpdir = tempfile.mkdtemp()
+    conf.sync_deps(os.path.join(tmpdir, "deps"))  # Create
+    conf.sync_deps(os.path.join(tmpdir, "deps"))  # Update
+    shutil.rmtree(tmpdir)
+
     # Python 2/3 compatible
     for key, sym in conf.syms.items():
         verify(isinstance(key, str), "weird key '{}' in syms dict".format(key))