[clang] [compiler-rt] [compiler-rt][rtsan] Introduce rtsan_interface.h and ScopedDisabler (PR #106736)

[Vitaly Buka via cfe-commits]

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@@ -0,0 +1,69 @@
+//===-- sanitizer/rtsan_interface.h -----------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of RealtimeSanitizer.
+//
+// Public interface header.
+//===----------------------------------------------------------------------===//
+
+#ifndef SANITIZER_RTSAN_INTERFACE_H
+#define SANITIZER_RTSAN_INTERFACE_H
+
+#if __has_include(<sanitizer/common_interface_defs.h>)
+#include <sanitizer/common_interface_defs.h>
+#else
+#define SANITIZER_CDECL
+#endif // __has_include(<sanitizer/common_interface_defs.h>)
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+// Disable all RTSan error reporting.
+// Must be paired with a call to `__rtsan_enable`
+void SANITIZER_CDECL __rtsan_disable(void);
+
+// Re-enable all RTSan error reporting.
+// Must follow a call to `__rtsan_disable`.
+void SANITIZER_CDECL __rtsan_enable(void);
+
+#ifdef __cplusplus
+} // extern "C"
+
+namespace __rtsan {
+#if defined(__has_feature) && __has_feature(realtime_sanitizer)
+
+class ScopedDisabler {
+public:
+  ScopedDisabler() { __rtsan_disable(); }
+  ~ScopedDisabler() { __rtsan_enable(); }
+
+#if __cplusplus >= 201103L
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vitalybuka wrote:

you probably want to delelet for !rt_san case as well
it will be weird if code compiles without sanitizer but fail with

https://github.com/llvm/llvm-project/pull/106736