https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102377
Bug ID: 102377
Summary: FAIL: 29_atomics/atomic_flag/cons/56012.cc with
-std=gnu++20
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
CC: rodgertq at gcc dot gnu.org
Target Milestone: ---
In file included from
/home/jwakely/src/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h:41,^M
from
/home/jwakely/src/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/atomic:41,^M
from
/home/jwakely/src/gcc/gcc/libstdc++-v3/testsuite/29_atomics/atomic_flag/cons/56012.cc:21:^M
/home/jwakely/src/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_wait.h:194:
warning: use of 'std::hardware_destructive_interference_size'
[-Winterference-size]^M
/home/jwakely/src/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_wait.h:194:
note: its value can vary between compiler versions or with different '-mtune'
or '-mcpu' flags^M
/home/jwakely/src/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_wait.h:194:
note: if this use is part of a public ABI, change it to instead use a constant
variable you define^M
/home/jwakely/src/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_wait.h:194:
note: the default value for the current CPU tuning is 64 bytes^M
/home/jwakely/src/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_wait.h:194:
note: you can stabilize this value with '--param
hardware_destructive_interference_size=64', or disable this warning with
'-Wno-interference-size'^M
FAIL: 29_atomics/atomic_flag/cons/56012.cc (test for excess errors)
Excess errors:
/home/jwakely/src/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_wait.h:194:
warning: use of 'std::hardware_destructive_interference_size'
[-Winterference-size]
This is because <bits/atomic_wait.h> uses
hardware_destructive_interference_size, which we probably don't want to do in
the library headers.
