simon-weber · Sep 29, 2026 · Sep 17, 2026 · Sep 29, 2026
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
@@ -35,7 +35,7 @@ jobs:
           key: pip|${{ hashFiles('setup.py') }}|${{ hashFiles('setup.cfg') }}
       - run: pip install tox
       - run: git submodule update --init --force
-      - run: env FAKETIME_COMPILE_CFLAGS="-UFAKE_STAT -UFAKE_UTIME -UFAKE_SLEEP" make -C libfaketime/vendor/libfaketime
+      - run: env FAKETIME_COMPILE_CFLAGS="-UFAKE_STAT -UFAKE_UTIME -UFAKE_SLEEP -Wno-unused-function" make -C libfaketime/vendor/libfaketime
         if: runner.os == 'Linux'
       - run: make -C libfaketime/vendor/libfaketime
         if: runner.os == 'macOS'

diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -3,11 +3,14 @@ Changelog
 
 [Semantic versioning](http://semver.org/) is used.
 
-3.1.0
+4.0.0
 -----
+released ...
 
 - breaking: drop support for python 3.9 and 3.10
 - add support for python 3.14
+- upgrade vendored libfaketime to 0.9.13 without modifications, fixing build failures with recent glibc versions and compilers defaulting to ISO C23
+- build the vendored libfaketime with `-Wno-unused-function`, to work around an upstream build failure in 0.9.13
 
 3.0.1
 -----

diff --git a/README.md b/README.md
@@ -183,7 +183,7 @@ Contributions are welcome! You should compile libfaketime before running tests:
 ```bash
 git submodule init --update
 # For Linux:
-env FAKETIME_COMPILE_CFLAGS="-UFAKE_STAT -UFAKE_UTIME -UFAKE_SLEEP" make -C libfaketime/vendor/libfaketime
+env FAKETIME_COMPILE_CFLAGS="-UFAKE_STAT -UFAKE_UTIME -UFAKE_SLEEP -Wno-unused-function" make -C libfaketime/vendor/libfaketime
 # For macOS
 env make -C libfaketime/vendor/libfaketime
 ```

diff --git a/libfaketime/vendor/libfaketime b/libfaketime/vendor/libfaketime
diff --git a/setup.py b/setup.py
@@ -40,10 +40,13 @@ class CustomInstall(install):
     def run(self):
         self.my_outputs = []
         if sys.platform in ("linux", "linux2"):
+            # -Wno-unused-function works around a libfaketime 0.9.13 build
+            # failure under -UFAKE_SLEEP; drop it once 0.9.14 is vendored.
             subprocess.check_call(
                 [
                     "env",
-                    "FAKETIME_COMPILE_CFLAGS=-UFAKE_STAT -UFAKE_UTIME -UFAKE_SLEEP",
+                    "FAKETIME_COMPILE_CFLAGS="
+                    "-UFAKE_STAT -UFAKE_UTIME -UFAKE_SLEEP -Wno-unused-function",
                     "make",
                     "-C",
                     _vendor_path,
+12 −0		.clang-format
+308 −6		.github/workflows/make-test.yml
+22 −0		.github/workflows/stale.yml
+5 −0		.gitignore
+38 −0		CONTRIBUTING.md
+7 −1		Makefile
+57 −0		NEWS
+124 −6		README
+47 −0		README.OSX
+7 −0		README.developers
+9 −6		man/faketime.1
+79 −12		src/Makefile
+35 −9		src/Makefile.OSX
+51 −0		src/android_compat.h
+283 −68		src/faketime.c
+44 −2		src/faketime_common.h
+230 −0		src/ft_sem.c
+62 −0		src/ft_sem.h
+2,290 −522		src/libfaketime.c
+12 −1		src/libfaketime.map
+90 −21		src/time_ops.h
+1 −1		src/timeprivacy
+11 −0		test/Dockerfile.fedora-sanitizer
+117 −8		test/Makefile
+70 −5		test/Makefile.OSX
+28 −0		test/README-fedora.md
+137 −0		test/README-platforms.md
+48 −0		test/abi_info_test.c
+17 −0		test/asan_preload_test.c
+45 −0		test/ci_validate.sh
+9 −0		test/clean_build.sh
+48 −0		test/clock_consistency_test.c
+28 −0		test/clock_error_test.c
+36 −0		test/compile_abi_variants.sh
+14 −0		test/docker_arm64.sh
+176 −0		test/docker_baseline.sh
+116 −0		test/docker_sanitizers.sh
+42 −0		test/emfile_clock_test.c
+32 −0		test/fake_pid_contract_test.c
+20 −0		test/fake_pid_test.c
+50 −0		test/fd_leak_test.c
+39 −0		test/fd_liveness_test.c
+130 −0		test/file_timestamp_test.c
+5 −5		test/functests/common.inc
+71 −0		test/functests/test_abi_filesystem.sh
+46 −0		test/functests/test_asan_preload.sh
+49 −0		test/functests/test_async_runtime.sh
+36 −0		test/functests/test_clock_consistency.sh
+140 −0		test/functests/test_clock_contract.sh
+40 −0		test/functests/test_concurrency_stress.sh
+119 −0		test/functests/test_config_file.sh
+1 −1		test/functests/test_exclude_mono.sh
+278 −0		test/functests/test_failure_paths.sh
+54 −0		test/functests/test_fake_pid.sh
+37 −0		test/functests/test_file_timestamps.sh
+87 −0		test/functests/test_follow_absolute.sh
+74 −0		test/functests/test_linux_timer_contract.sh
+56 −0		test/functests/test_loader_hardening.sh
+167 −0		test/functests/test_numeric_config.sh
+47 −0		test/functests/test_random.sh
+46 −0		test/functests/test_recent_issue_regressions.sh
+55 −0		test/functests/test_resource_safety.sh
+96 −0		test/functests/test_runtime_probe.sh
+30 −0		test/functests/test_shm_across_processes.sh
+112 −0		test/functests/test_shm_lifecycle.sh
+86 −0		test/functests/test_spawn_exec.sh
+37 −0		test/functests/test_syscall_intercept.sh
+73 −0		test/functests/test_time_model.sh
+12 −3		test/functests/test_walkone.sh
+64 −0		test/futex_contract_test.c
+9 −0		test/fuzz/README
+5 −0		test/fuzz/config-boundaries
+8 −0		test/fuzz/faketime-boundaries
+18 −0		test/init_reentry.c
+43 −0		test/macos_clock_test.c
+5 −0		test/optional_runtime_probe.rs
+38 −0		test/random_test.c
+32 −0		test/release_check.sh
+184 −0		test/sem_contract_test.c
+32 −0		test/set_mtime.c
+90 −0		test/shm_layout_test.c
+3 −0		test/snippets/include_headers.h
+32 −0		test/snippets/syscall_clock_nanosleep.c
+1 −0		test/snippets/syscall_clock_nanosleep.variable
+1 −1		test/snippets/time.c
+27 −0		test/syscall_contract_test.c
+32 −8		test/test.sh
+6 −0		test/test_OSX.sh
+1 −1		test/test_variable_data.sh
+1 −1		test/testframe.sh
+41 −0		test/time64_contract_test.c
+75 −0		test/time_ops_test.c
+83 −0		test/timerfd_contract_test.c
+194 −15		test/timetest.c
+15 −0		test/timezone_contract_test.c
+24 −0		test/valgrind.sh
+99 −0		test/wait_api_contract_test.c
+66 −0		test/wait_contract_test.c
+45 −0		test/wait_timeout_contract_test.c