Vendor import of compiler-rt trunk r321017:vendor/compiler-rt/compiler-rt-trunk-r321017

https://llvm.org/svn/llvm-project/compiler-rt/trunk@321017

1 files changed, 47 insertions, 0 deletions

diff --git a/lib/sanitizer_common/sanitizer_getauxval.h b/lib/sanitizer_common/sanitizer_getauxval.h
new file mode 100644
index 000000000000..934e311a7851
--- /dev/null
+++ b/lib/sanitizer_common/sanitizer_getauxval.h
@@ -0,0 +1,47 @@
+//===-- sanitizer_getauxval.h -----------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Common getauxval() guards and definitions.
+// getauxval() is not defined until glibc version 2.16, or until API level 21
+// for Android.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SANITIZER_GETAUXVAL_H
+#define SANITIZER_GETAUXVAL_H
+
+#include "sanitizer_platform.h"
+
+#if SANITIZER_LINUX
+
+# include <features.h>
+
+# ifndef __GLIBC_PREREQ
+#  define __GLIBC_PREREQ(x, y) 0
+# endif
+
+# if __GLIBC_PREREQ(2, 16) || (SANITIZER_ANDROID && __ANDROID_API__ >= 21)
+#  define SANITIZER_USE_GETAUXVAL 1
+# else
+#  define SANITIZER_USE_GETAUXVAL 0
+# endif
+
+# if SANITIZER_USE_GETAUXVAL
+#  include <sys/auxv.h>
+# else
+// The weak getauxval definition allows to check for the function at runtime.
+// This is useful for Android, when compiled at a lower API level yet running
+// on a more recent platform that offers the function.
+extern "C" SANITIZER_WEAK_ATTRIBUTE
+unsigned long getauxval(unsigned long type);  // NOLINT
+# endif
+
+#endif // SANITIZER_LINUX
+
+#endif // SANITIZER_GETAUXVAL_H