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* [gcc r12-4234] libstdc++: Avoid use of hardware interference non-constant [PR102377]
@ 2021-10-07 17:39 Jonathan Wakely
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From: Jonathan Wakely @ 2021-10-07 17:39 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:0e90799071ee78f712f3b58fca7000bc0a258ade
commit r12-4234-g0e90799071ee78f712f3b58fca7000bc0a258ade
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Thu Oct 7 18:28:04 2021 +0100
libstdc++: Avoid use of hardware interference non-constant [PR102377]
libstdc++-v3/ChangeLog:
PR libstdc++/102377
* include/bits/atomic_wait.h (__waiter_pool_base:_S_align):
Hardcode to 64 instead of using non-constant constant.
Diff:
---
libstdc++-v3/include/bits/atomic_wait.h | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/libstdc++-v3/include/bits/atomic_wait.h b/libstdc++-v3/include/bits/atomic_wait.h
index 35c92644146..2ac07ccd05e 100644
--- a/libstdc++-v3/include/bits/atomic_wait.h
+++ b/libstdc++-v3/include/bits/atomic_wait.h
@@ -190,11 +190,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct __waiter_pool_base
{
-#ifdef __cpp_lib_hardware_interference_size
- static constexpr auto _S_align = hardware_destructive_interference_size;
-#else
- static constexpr auto _S_align = 64;
-#endif
+ // Don't use std::hardware_destructive_interference_size here because we
+ // don't want the layout of library types to depend on compiler options.
+ static constexpr auto _S_align = 64;
alignas(_S_align) __platform_wait_t _M_wait = 0;
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