Issue #13645: pyc files now contain the size of the corresponding source
code, to avoid timestamp collisions (especially on filesystems with a low
timestamp resolution) when checking for freshness of the bytecode.
diff --git a/Lib/py_compile.py b/Lib/py_compile.py
index 5adb70a..62d69ad 100644
--- a/Lib/py_compile.py
+++ b/Lib/py_compile.py
@@ -110,9 +110,11 @@
"""
with tokenize.open(file) as f:
try:
- timestamp = int(os.fstat(f.fileno()).st_mtime)
+ st = os.fstat(f.fileno())
except AttributeError:
- timestamp = int(os.stat(file).st_mtime)
+ st = os.stat(file)
+ timestamp = int(st.st_mtime)
+ size = st.st_size & 0xFFFFFFFF
codestring = f.read()
try:
codeobject = builtins.compile(codestring, dfile or file, 'exec',
@@ -139,6 +141,7 @@
with open(cfile, 'wb') as fc:
fc.write(b'\0\0\0\0')
wr_long(fc, timestamp)
+ wr_long(fc, size)
marshal.dump(codeobject, fc)
fc.flush()
fc.seek(0, 0)