Allow to check explicit flags in assertflags.py

flags/assertflags.py

@@ -14,6 +14,9 @@ the last such option is the one that is effective."
 import sys
 import sysconfig
 
+# We will check all flags if none were requested
+KEYS_TO_CHECK = sys.argv[2:] or list(sysconfig.get_config_vars().keys())
+
 # The flags that currently don't have the -Og flag on the debug build
 # and we consider it OK, because we don't know any better :)
 SKIP = [
@@ -26,9 +29,10 @@ SKIP = [
 print('Expecting that {} is the last -O flag:\n'.format(sys.argv[1]))
 ret = 0
 
-for key, flags in sysconfig.get_config_vars().items():
+for key in KEYS_TO_CHECK:
     if key in SKIP:
         continue
+    flags = sysconfig.get_config_vars()[key]
     if isinstance(flags, str):
         oflags = [f for f in flags.split(' ') if f.startswith('-O')]
         if oflags and oflags[-1] != sys.argv[1]:

tests.yml

@@ -69,6 +69,9 @@
     - debugflags:
         dir: flags
         run: runuser testuser -c 'python3-debug ./assertflags.py -O0'
+    - debugflags_some:
+        dir: flags
+        run: runuser testuser -c 'python3-debug ./assertflags.py -O0 PY_STDMODULE_CFLAGS'
     - marshalparser_compatibility:
         dir: marshalparser
         run: runuser testuser -c 'SAMPLE=10 test_marshalparser_compatibility.sh'