i#2154 Android64: Link static c++ runtime library (#7239)

Android splits the C++ STL runtime into a separate library which is not
provided as a standard system library. Applications are expected to
statically link the STL library (libc++_static.a) or distribute the
dynamic library (libc++_shared.so) with the application [1].

All C++ targets should now be linking the static runtime libraries.

[1]
https://developer.android.com/ndk/guides/cpp-support#important_considerations

Issue: #2154, #1874

make/DynamoRIOConfig.cmake.in

@@ -788,6 +788,12 @@ function (_DR_set_compile_flags target is_client extra_flags static_DR)
         set(extra_flags "${extra_flags} -fno-stack-protector")
       endif (flag_present)
 
+      if (ANDROID AND tgt_cxx)
+          # We use static C++ runtime libraries on Android so we need to wrap the libc
+          # allocation functions. See https://dynamorio.org/using.html#subsec_no_loader.
+        string(APPEND tgt_link_flags " -Xlinker -wrap=malloc -Xlinker -wrap=realloc -Xlinker -wrap=free")
+      endif ()
+
     endif (is_client)
 
     if (NOT APPLE AND NOT ANDROID) # no .gnu.hash support on Android

make/toolchain-android-llvm.cmake

@@ -87,3 +87,8 @@ SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
 SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
 SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 set(CMAKE_LIBRARY_ARCHITECTURE ${TARGET_ABI})
+
+# Use static C++ runtime libraries.
+set(CMAKE_ANDROID_STL_TYPE "c++_static")
+string(APPEND CMAKE_CXX_FLAGS_INIT " -stdlib=libc++")
+string(APPEND CMAKE_CXX_STANDARD_LIBRARIES " -static-libstdc++")