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git_commit commit c6d95c441a29a45782ff72d6cb82839b86fd0e4a
Author: Vitaly Buka <vitalybuka@google.com>
Date: Sat Feb 15 19:54:23 2025 -0800

[libc++] Fix initialization-order-fiasco with iostream.cpp constructors (#126995)

Asan reports it after #124103.

It's know case of false positive for Asan.

https://github.com/google/sanitizers/wiki/AddressSanitizerInitializationOrderFiasco#false-positives

It's can be avoided with `constexpr` constructors.

In general order global constructors in different
modules is undefined. If global constructor uses
external global, they can be not constructed yet.

However, implementation may contain workaround for
that, or the state of non-constructed global can
be still valid.

Asan will still falsely report such cases, as it
has no machinery to detect correctness of such
cases.

We need to fix/workaround the issue in libc++, as
it will affect many libc++ with Asan users.
Filter

ldionne-old-macbook-results test results

Run Order Start Time Duration
Current 527491 2025-12-16T16:40:01 0:00:00
Previous 527478 2025-12-16T16:40:01 0:00:00
Baseline 485288 2025-12-16T16:40:01 0:00:00


Tests Summary

Status Group # # (B)
Performance Regressions 5 0
Performance Improvements 2 0
Added Tests 0 17
Unchanged Tests 83 73
Total Tests 90

Performance Regressions - execution_time Δ Previous Current σ Δ (B) σ (B)
748_flightdm_r 2.13% 8.800 8.988 - 0.00% -
723_llvm_r 1.77% 11.505 11.709 - 0.00% -
767_nest_r 1.64% 14.095 14.327 - 0.00% -
734_vpr_r 1.61% 15.399 15.648 - 0.00% -
750_sealcrypto_r 1.02% 18.341 18.528 - 0.00% -

Performance Improvements - execution_time Δ Previous Current σ Δ (B) σ (B)
731_astcenc_r -2.04% 10.322 10.112 - 0.00% -
727_cppcheck_r -1.55% 25.006 24.619 - 0.00% -

Added Tests - execution_time
706_stockfish_r
707_ntest_r
709_cactus_r
710_omnetpp_r
721_gcc_r
723_llvm_r
727_cppcheck_r
729_abc_r
731_astcenc_r
734_vpr_r
736_ocio_r
737_gmsh_r
748_flightdm_r
750_sealcrypto_r
753_ns3_r
766_femflow_r
767_nest_r


Report Time: 0.09s
Name Current %
706_stockfish_r 22.187 -
707_ntest_r 17.862 -
709_cactus_r 19.718 -
710_omnetpp_r 8.442 -
721_gcc_r 12.985 -
723_llvm_r 11.709 1.77%
727_cppcheck_r 24.619 -1.55%
729_abc_r 18.745 -
731_astcenc_r 10.112 -2.04%
734_vpr_r 15.648 1.61%
736_ocio_r 16.298 -
737_gmsh_r 13.189 -
748_flightdm_r 8.988 2.13%
750_sealcrypto_r 18.528 1.02%
753_ns3_r 10.608 -
766_femflow_r 12.871 -
767_nest_r 14.327 1.64%
Geometric Mean 14.435 -