make check mail fail malloc_extension_c_test sometimes

What steps will reproduce the problem?
1. just ./configure --enable-minimal --disable-static --enable-shared && make 
check on recent GNU/Linux box. My gcc is gcc (Debian 4.7.2-5) 4.7.2
2.
3.

What is the expected output? What do you see instead?
All tests should pass, but malloc_extension_c_test fails

Please use labels and text to provide additional information.

I've found that my gcc is too smart and replaces free(malloc(N)) with nothing. 
Patch below fixes the problem.

Original issue reported on code.google.com by alkondratenko on 11 Mar 2013 at 7:22

Attachments:

0001-fixed-bogus-unit-test-failure.patch

stellar2012wxg / gperftools

make check mail fail malloc_extension_c_test sometimes #506