commit a06c89387621b0a040e6203e7f1a2d8243f5be33
author Louis Dionne <ldionne.2@gmail.com> Tue Jan 28 16:44:57 2025 -0500
committer GitHub <noreply@github.com> Tue Jan 28 16:44:57 2025 -0500
tree d29d864f9333f2ef43595350fd5734651c339957
parent e89e7c4685aa673173220eace7a0a8b64dbd2391

[libc++abi] Make once_flag constinit in cxa_exception_storage (#124627)

This makes it clearer that initialization of this global variable is
taking place at compile-time, reducing the likelihood of static
initialization order fiasco.

libcxxabi/src/cxa_exception_storage.cpp

diff --git a/libcxxabi/src/cxa_exception_storage.cpp b/libcxxabi/src/cxa_exception_storage.cpp
index 733f0d4..05da6a4 100644
--- a/libcxxabi/src/cxa_exception_storage.cpp
+++ b/libcxxabi/src/cxa_exception_storage.cpp
@@ -56,7 +56,7 @@
 namespace __cxxabiv1 {
 namespace {
     std::__libcpp_tls_key key_;
-    std::__libcpp_exec_once_flag flag_ = _LIBCPP_EXEC_ONCE_INITIALIZER;
+    constinit std::__libcpp_exec_once_flag flag_ = _LIBCPP_EXEC_ONCE_INITIALIZER;
 
     void _LIBCPP_TLS_DESTRUCTOR_CC destruct_(void *p) {
         __free_with_fallback(p);