From f029957835feeae320d5368be27b578912236a60 Mon Sep 17 00:00:00 2001
From: Logikoma <logikoma@aklabs.net>
Date: Wed, 5 Aug 2026 13:41:34 -0400
Subject: [PATCH 1/2] Add ASan and UBSan CI coverage

---
 .gitea/workflows/ci.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
index efdee35..4a0b639 100644
--- a/.gitea/workflows/ci.yaml
+++ b/.gitea/workflows/ci.yaml
@@ -64,6 +64,7 @@ jobs:
               -I tests \
               tests/freestanding_fixture.c -o /tmp/freestanding_fixture.o
       - run: echo "🍏 This job's status is ${{ job.status }}."
+
   sanitizer:
     runs-on: ubuntu-latest
     steps:

From 6670837643d8319f4ad17d1c5f398c09c4ca7d9c Mon Sep 17 00:00:00 2001
From: Logikoma <logikoma@aklabs.net>
Date: Wed, 5 Aug 2026 13:42:12 -0400
Subject: [PATCH 2/2] Pass CMake arguments to mutation builds

---
 scripts/mutation_test.py | 12 +++++++++---
 tests/MUTATION.md        |  9 +++++++--
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/scripts/mutation_test.py b/scripts/mutation_test.py
index 1b2828e..0cc4294 100755
--- a/scripts/mutation_test.py
+++ b/scripts/mutation_test.py
@@ -25,6 +25,8 @@ Usage:
     --work DIR          scratch dir for the mutated copy (default: a temp dir)
     --timeout SECONDS   per-suite ctest timeout (default: 120)
     --threshold PCT     exit non-zero if mutation score < PCT (default: 0 = off)
+    --cmake-arg ARG     pass an additional argument to the mutant CMake configure;
+                        repeat for multiple arguments (e.g. -DAKERR_SANITIZE=thread)
     --list              only list the mutants that would be run, then exit
     --keep              keep the scratch working copy on exit (for debugging)
     -j N                (reserved) currently runs sequentially
@@ -199,10 +201,11 @@ def generate_mutants(root, rel_target):
 # --------------------------------------------------------------------------- #
 
 class Runner:
-    def __init__(self, work, timeout):
+    def __init__(self, work, timeout, cmake_args):
         self.work = work
         self.build = os.path.join(work, "build")
         self.timeout = timeout
+        self.cmake_args = cmake_args
 
     def _run(self, cmd, timeout=None):
         return subprocess.run(
@@ -211,7 +214,8 @@ class Runner:
         )
 
     def configure(self):
-        r = self._run(["cmake", "-S", ".", "-B", "build"], timeout=self.timeout)
+        r = self._run(["cmake", "-S", ".", "-B", "build", *self.cmake_args],
+                      timeout=self.timeout)
         return r.returncode == 0, r.stdout
 
     def build_and_test(self):
@@ -307,6 +311,8 @@ def main():
     ap.add_argument("--work", default=None)
     ap.add_argument("--timeout", type=int, default=120)
     ap.add_argument("--threshold", type=float, default=0.0)
+    ap.add_argument("--cmake-arg", action="append", default=[],
+                    help="pass an argument to the mutant CMake configure; repeatable")
     ap.add_argument("--junit", default=None,
                     help="write a JUnit XML report to this path")
     ap.add_argument("--max-mutants", type=int, default=0,
@@ -354,7 +360,7 @@ def main():
     print(f"\nCopying sources to scratch dir: {work}")
     copy_tree(root, work)
 
-    runner = Runner(work, args.timeout)
+    runner = Runner(work, args.timeout, args.cmake_arg)
 
     print("Configuring baseline ...")
     ok, out = runner.configure()
diff --git a/tests/MUTATION.md b/tests/MUTATION.md
index a5cfcd7..1d993b6 100644
--- a/tests/MUTATION.md
+++ b/tests/MUTATION.md
@@ -32,6 +32,9 @@ scripts/mutation_test.py --target src/error.c --list
 
 # Gate CI: exit non-zero if the score drops below 90%
 scripts/mutation_test.py --threshold 90
+
+# Check concurrency mutants under ThreadSanitizer
+scripts/mutation_test.py --cmake-arg=-DAKERR_SANITIZE=thread
 ```
 
 Via CMake (configures a build first if needed):
@@ -40,8 +43,10 @@ Via CMake (configures a build first if needed):
 cmake --build build --target mutation
 ```
 
-Useful flags: `--timeout SECONDS` (per-suite build+test cap; a mutant that
-hangs is counted as killed), `--keep` (retain the scratch copy for debugging),
+Useful flags: `--cmake-arg ARG` (pass a CMake configure argument to every
+mutant build; repeat it for multiple arguments), `--timeout SECONDS` (per-suite
+build+test cap; a mutant that hangs is counted as killed), `--keep` (retain the
+scratch copy for debugging),
 `--work DIR` (use a specific scratch directory), `--junit FILE` (write a JUnit
 XML report — surviving mutants appear as failing test cases).