See http://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20150302/124624.html
where PIE as default on Android was removed. This patch brings it back.

diff -u -r ../llvm-3.7.0.src/tools/clang/lib/Driver/ToolChains.cpp ./tools/clang/lib/Driver/ToolChains.cpp
--- ../llvm-3.7.0.src/tools/clang/lib/Driver/ToolChains.cpp	2015-07-13 19:27:56.000000000 -0400
+++ ./tools/clang/lib/Driver/ToolChains.cpp	2015-09-04 10:38:53.984720577 -0400
@@ -3598,7 +3598,7 @@
   }
 }
 
-bool Linux::isPIEDefault() const { return getSanitizerArgs().requiresPIE(); }
+bool Linux::isPIEDefault() const { return true; }
 
 SanitizerMask Linux::getSupportedSanitizers() const {
   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;