[PATCH] D56000: [compiler-rt] [xray] Disable alignas() for thread_local objects on NetBSD

[Michał Górny via Phabricator via cfe-commits]

mgorny marked an inline comment as done.
mgorny added inline comments.


================
Comment at: lib/xray/xray_basic_logging.cc:58
 
-struct alignas(64) ThreadLocalData {
+struct
+/* TLD is not aligned properly on NetBSD, resulting in segfault */
----------------
krytarowski wrote:
> Can we introduce a macro like:
> 
> ```
> #if SANITIZER_NETBSD
> #define XRAY_TLS_ALIGNAS64 /* Nor supported */
> #else
> #define XRAY_TLS_ALIGNED_SUPPORTED
> #define XRAY_TLS_ALIGNAS64 alignas(64)
> #endif
> ```
> 
> And later:
> 
> ```
> struct XRAY_TLS_ALIGNAS64 ThreadLocalData {
> ```
> 
> and
> 
> ```
> #ifdef XRAY_TLS_ALIGNED_SUPPORTED
> static_assert(alignof(ThreadLocalData) >= 64,
>               "ThreadLocalData must be cache line aligned.");
> #endif
> ```
Maybe. Though i suppose it'd make more sense to make `64` an argument to the macro.


Repository:
  rCRT Compiler Runtime

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  https://reviews.llvm.org/D56000/new/

https://reviews.llvm.org/D56000