Handle --debug containing memoizer

The memoizer statistics have to be handled specially as they use
conditional decorators, those have to be enabled before any of the
decorated methods are read by Python.  This worked if there was exactly
"--debug=memoizer" on the commandline or in SCONSFLAGS, but not if it
was in a multi-value option like "--debug=presub,memoizer".
Handle the up-front-check a little more completely to fix this.

Signed-off-by: Mats Wichmann <mats@linux.com>

Author: mwichmann

CHANGES.txt

@@ -200,6 +200,8 @@ RELEASE  VERSION/DATE TO BE FILLED IN LATER
       attribute and to explain what's being done in the example.
     - Test framework reformatted using settings from pyproject.toml.
       Includes code embedded in docstrings.
+    - Handle case of "memoizer" as one member of a comma-separated
+      --debug string - this was previously missed.
 
     From Adam Scott:
     - Changed Ninja's TEMPLATE rule pool to use `install_pool` instead of

RELEASE.txt

@@ -179,6 +179,9 @@ FIXES
 - Fix Issue #2281, AddPreAction() & AddPostAction() were being ignored if no action
   was specified when the Alias was initially created.
 
+- Handle case of "memoizer" as one member of a comma-separated
+  --debug string - this was previously missed.
+
 IMPROVEMENTS
 ------------
 

SCons/Script/__init__.py

@@ -35,6 +35,7 @@
 start_time = time.time()
 
 import collections
+import itertools
 import os
 from io import StringIO
 
@@ -53,9 +54,17 @@
 # to not add the shims.  So we use a special-case, up-front check for
 # the "--debug=memoizer" flag and enable Memoizer before we import any
 # of the other modules that use it.
-
-_args = sys.argv + os.environ.get('SCONSFLAGS', '').split()
-if "--debug=memoizer" in _args:
+# Update: this breaks if the option isn't exactly "--debug=memoizer",
+# like if there is more than one debug option as a csv. Do a bit more work.
+
+_args = sys.argv + os.environ.get("SCONSFLAGS", "").split()
+_args = (
+    arg[len("--debug=") :].split(",")
+    for arg in _args
+    if arg.startswith("--debug=")
+)
+_args = list(itertools.chain.from_iterable(_args))
+if "memoizer" in _args:
     import SCons.Memoize
     import SCons.Warnings
     try:

test/option/debug-memoizer.py

@@ -1,6 +1,8 @@
 #!/usr/bin/env python
 #
-# __COPYRIGHT__
+# MIT License
+#
+# Copyright The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -20,26 +22,21 @@
 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-#
-
-__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
 
-"""
-Test calling the --debug=memoizer option.
-"""
+"""Test calling the --debug=memoizer option."""
 
 import os
 
 import TestSCons
 
-test = TestSCons.TestSCons(match = TestSCons.match_re_dotall)
-
+test = TestSCons.TestSCons(match=TestSCons.match_re_dotall)
 
 test.write('SConstruct', """
-DefaultEnvironment(tools=[])
 def cat(target, source, env):
     with open(str(target[0]), 'wb') as f, open(str(source[0]), 'rb') as infp:
         f.write(infp.read())
+
+DefaultEnvironment(tools=[])
 env = Environment(tools=[], BUILDERS={'Cat':Builder(action=Action(cat))})
 env.Cat('file.out', 'file.in')
 """)
@@ -51,36 +48,35 @@ def cat(target, source, env):
 # names in the implementation, so if we change them, we'll have to
 # change this test...
 expect = [
-    "Memoizer (memory cache) hits and misses",
-    "Base.stat()",
+    # "Memoizer (memory cache) hits and misses",
     "Dir.srcdir_list()",
+    "File.stat()",
     "File.exists()",
     "Node._children_get()",
 ]
 
-
-for args in ['-h --debug=memoizer', '--debug=memoizer']:
-    test.run(arguments = args)
-    test.must_contain_any_line(test.stdout(), expect)
-
+test.run(arguments='--debug=memoizer')
+test.must_contain_any_line(test.stdout(), expect)
 test.must_match('file.out', "file.in\n")
-
-
-
 test.unlink("file.out")
 
+# make sure it also works if memoizer is not the only debug flag
+test.run(arguments='--debug=sconscript,memoizer')
+test.must_contain_any_line(test.stdout(), expect)
+test.must_match('file.out', "file.in\n")
+test.unlink("file.out")
 
+# memoization should still report even in help mode
+test.run(arguments='-h --debug=memoizer')
+test.must_contain_any_line(test.stdout(), expect)
+test.must_not_exist("file.out")
 
+# also try setting in SCONSFLAGS
 os.environ['SCONSFLAGS'] = '--debug=memoizer'
-
-test.run(arguments = '')
-
+test.run(arguments='.')
 test.must_contain_any_line(test.stdout(), expect)
-
 test.must_match('file.out', "file.in\n")
 
-
-
 test.pass_test()
 
 # Local Variables: