[llvm] [compiler-rt] [sanitizer_common] Add experimental flag to tweak dlopen(<main program>) (PR #71715)

[Vitaly Buka via llvm-commits]

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@@ -0,0 +1,35 @@
+//===-- sanitizer_dl.cpp --------------------------------------------------===//
+//
+// 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 has helper functions that depend on libc's dynamic loading
+// introspection.
+//
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_dl.h"
+
+#include <dlfcn.h>
+
+#include "sanitizer_common/sanitizer_platform.h"
+
+namespace __sanitizer {
+extern const char *SanitizerToolName;
+
+int dladdr_self_fname(const char **fname) {
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vitalybuka wrote:

Can you just  return `const char*` or nullptr?

https://github.com/llvm/llvm-project/pull/71715