Different behavior of override weak function in shared library between OS X and Android

Question

I am encountering a different behavior between OS X and Android:

• There is a weak function foo in my shared library,
• I want to override it

Answer 1

Android doesn't support weak symbol override.

In the recent release android-5.0.2_r1, see the comment at line 539 in linker.cpp source code

/*
 *
 * Notes on weak symbols:
 * The ELF specs are ambigious about treatment of weak definitions in
 * dynamic linking.  Some systems return the first definition found
 * and some the first non-weak definition.   This is system dependent.
 * Here we return the first definition found for simplicity.
 */

This comment exists from version 2.2_r1 (which is in linker.c) to newest version 5.0.2_r1