[sanitizer] Define SANITIZER_USE_GETAUXVAL for Android

Summary:
Android for API level >= 21 has `getauxval`. Enable `SANITIZER_USE_GETAUXVAL`
when those requirements are met. Correct a typo in the header.

Reviewers: alekseyshl

Reviewed By: alekseyshl

Subscribers: srhines, llvm-commits, kubamracek

Differential Revision: https://reviews.llvm.org/D40260

llvm-svn: 318775

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_getauxval.h b/compiler-rt/lib/sanitizer_common/sanitizer_getauxval.h
index d0287f0..7b255c6 100644 (file)
--- a/compiler-rt/lib/sanitizer_common/sanitizer_getauxval.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_getauxval.h
@@ -8,7 +8,8 @@
 //===----------------------------------------------------------------------===//
 //
 // Common getauxval() guards and definitions.
-// getauxval() is not defined until glbc version 2.16.
+// getauxval() is not defined until glibc version 2.16, or until API level 21
+// for Android.
 //
 //===----------------------------------------------------------------------===//
 
@@ -25,7 +26,7 @@
 #define __GLIBC_PREREQ(x, y) 0
 #endif
 
-#if __GLIBC_PREREQ(2, 16)
+#if __GLIBC_PREREQ(2, 16) || (SANITIZER_ANDROID && __ANDROID_API__ >= 21)
 # define SANITIZER_USE_GETAUXVAL 1
 #else
 # define SANITIZER_USE_GETAUXVAL 0