1. [clang] Selectively ena/disa-ble format-insufficient-args warning (details)
  2. [scudo][standalone] Remove unused atomic_compare_exchange_weak (details)
Commit 1e86d637eb4f88e03fcd4b9fd78192487dc2a302 by Jan Korous
[clang] Selectively ena/disa-ble format-insufficient-args warning

Differential Revision:
The file was addedclang/test/Sema/warn-printf-insufficient-data-args.c
The file was modifiedclang/test/Misc/warning-wall.c (diff)
The file was modifiedclang/include/clang/Basic/ (diff)
The file was modifiedclang/include/clang/Basic/ (diff)
Commit f668a84b58dcd816656236d7ba7e820dce52e7f8 by kostyak
[scudo][standalone] Remove unused atomic_compare_exchange_weak

`atomic_compare_exchange_weak` is unused in Scudo, and its associated
test is actually wrong since the weak variant is allowed to fail
spuriously (thanks Roland).

This lead to flakes such as:
[ RUN      ] ScudoAtomicTest.AtomicCompareExchangeTest
../../zircon/third_party/scudo/src/tests/atomic_test.cpp:98: Failure: Expected atomic_compare_exchange_weak(reinterpret_cast<T *>(&V), &OldVal, NewVal, memory_order_relaxed) is true.
    Expected: true
    Which is: 01
    Actual  : atomic_compare_exchange_weak(reinterpret_cast<T *>(&V), &OldVal, NewVal, memory_order_relaxed)
    Which is: 00
../../zircon/third_party/scudo/src/tests/atomic_test.cpp:100: Failure: Expected atomic_compare_exchange_weak( reinterpret_cast<T *>(&V), &OldVal, NewVal, memory_order_relaxed) is false.
    Expected: false
    Which is: 00
    Actual  : atomic_compare_exchange_weak( reinterpret_cast<T *>(&V), &OldVal, NewVal, memory_order_relaxed)
    Which is: 01
../../zircon/third_party/scudo/src/tests/atomic_test.cpp:101: Failure: Expected OldVal == NewVal.
    Expected: NewVal
    Which is: 24
    Actual  : OldVal
    Which is: 42
[  FAILED  ] ScudoAtomicTest.AtomicCompareExchangeTest (0 ms)
[----------] 2 tests from ScudoAtomicTest (1 ms total)

So I am removing this, if someone ever needs the weak variant, feel
free to add it back with a test that is not as terrible. This test was
initially ported from sanitizer_common, but their weak version calls
the strong version, so it works for them.

Differential Revision:
The file was modifiedcompiler-rt/lib/scudo/standalone/atomic_helpers.h (diff)
The file was modifiedcompiler-rt/lib/scudo/standalone/tests/atomic_test.cpp (diff)