| Issue |
159229
|
| Summary |
Spurious clang-cl warnings compiling atomics for ARM64EC
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
skoulik
|
The problem is only reproducible when compiling ARM64EC targets. Using std::atomic_bool::load, std::atomic_signal_fence and others produce warnings: '+cx16' is not a recognized feature for this target (ignoring feature)
Compiling for ARM64, AMD64 does not produce the warnings.
clang-cl --version
clang version 21.1.0
Target: x86_64-pc-windows-msvc
Thread model: posix
test.cpp:
#include <atomic>
int main()
{
std::atomic_signal_fence(std::memory_order_seq_cst);
return 0;
}
test.cpp (another example):
#include <atomic>
int main()
{
std::atomic_bool test {false};
auto t = test.load(std::memory_order_seq_cst);
return 0;
}
clang-cl --target=arm64ec-pc-windows-msvc test.cpp
'+cx16' is not a recognized feature for this target (ignoring feature)
'+cx16' is not a recognized feature for this target (ignoring feature)
clang-cl --target=arm64-pc-windows-msvc test.cpp
(empty output)
clang-cl --target=amd64-pc-windows-msvc test.cpp
(empty output)
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