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Clang 3.9 regression causes a bug when generating code for
std::atomic_compare_and_exchange*(std::atomic<long long>,...) without
optimizations. If same code is compiled with -O2 tests pass without problems.
Atomics are implement in headers with builtin functions which makes this
affect application code instead of libc++ library code.
libcxx tests default to -O0 compilation so these test need to be marked failing
on arm to allow installing packages. Use cases is so borderline failure that it
shouldn't prevent building the package. (64bit atomics in 32bit mode)
Index: llvm-toolchain-snapshot_7~svn337372/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong.pass.cpp
===================================================================
--- llvm-toolchain-snapshot_7~svn337372.orig/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong.pass.cpp
+++ llvm-toolchain-snapshot_7~svn337372/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong.pass.cpp
@@ -8,6 +8,7 @@
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
+// XFAIL: arm
// ... assertion fails line 34
// <atomic>
Index: llvm-toolchain-snapshot_7~svn337372/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong_explicit.pass.cpp
===================================================================
--- llvm-toolchain-snapshot_7~svn337372.orig/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong_explicit.pass.cpp
+++ llvm-toolchain-snapshot_7~svn337372/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong_explicit.pass.cpp
@@ -8,6 +8,7 @@
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
+// XFAIL: arm
// ... assertion fails line 38
// <atomic>
Index: llvm-toolchain-snapshot_7~svn337372/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak.pass.cpp
===================================================================
--- llvm-toolchain-snapshot_7~svn337372.orig/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak.pass.cpp
+++ llvm-toolchain-snapshot_7~svn337372/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak.pass.cpp
@@ -8,6 +8,7 @@
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
+// XFAIL: arm
// ... assertion fails line 34
// <atomic>
Index: llvm-toolchain-snapshot_7~svn337372/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak_explicit.pass.cpp
===================================================================
--- llvm-toolchain-snapshot_7~svn337372.orig/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak_explicit.pass.cpp
+++ llvm-toolchain-snapshot_7~svn337372/libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak_explicit.pass.cpp
@@ -8,6 +8,7 @@
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
+// XFAIL: arm
// ... assertion fails line 38
// <atomic>
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