Android's native bridge (i.e. AArch64 emulator) doesn't support TBI so
we need a way to disable TBI on Linux when targeting the native bridge.
This can also be used to test the no-TBI code path on Linux (currently
only used on Fuchsia), or make Scudo compatible with very old
(pre-commit
d50240a5f6ceaf690a77b0fccb17be51cfa151c2 from June 2013)
Linux kernels that do not enable TBI.
Differential Revision: https://reviews.llvm.org/D98732
// We assume that Top-Byte Ignore is enabled if the architecture supports memory
// tagging. Not all operating systems enable TBI, so we only claim architectural
// support for memory tagging if the operating system enables TBI.
-#if SCUDO_LINUX
+#if SCUDO_LINUX && !defined(SCUDO_DISABLE_TBI)
inline constexpr bool archSupportsMemoryTagging() { return true; }
#else
inline constexpr bool archSupportsMemoryTagging() { return false; }