pw_sync: add lock safety annotations for C++ clang usage
Adds clang thread safety annotations to the interrupt spin lock for
C++ usage. Note that this is only checked when compiling with clang.
C APIs explicitly escape the thread safety annotations.
Change-Id: Ic829afd41b3978c507ebe294d34e1e0dc03865b4
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/40241
Reviewed-by: Keir Mierle <keir@google.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>
Pigweed-Auto-Submit: Ewout van Bekkum <ewout@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/pw_build/BUILD.gn b/pw_build/BUILD.gn
index 777ef22..706b8d6 100644
--- a/pw_build/BUILD.gn
+++ b/pw_build/BUILD.gn
@@ -87,6 +87,12 @@
cflags_cc = [ "-Wnon-virtual-dtor" ]
}
+# Thread safety warnings are only supported by Clang.
+config("clang_thread_safety_warnings") {
+ cflags = [ "-Wthread-safety" ]
+ defines = [ "_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS=1" ]
+}
+
# This config contains warnings that we don't necessarily recommend projects
# enable, but are enabled for upstream Pigweed for maximum project
# compatibility.