Fix ubuntu (probably newer gcc) folly check
commit09b19cffc1965e129953b6c83f0aea6cdf9935c0
authorElizabeth Smith <elizabeths@fb.com>
Thu, 24 Jul 2014 19:55:28 +0000 (24 12:55 -0700)
committerfacebook-github-bot <githubbot@fb.com>
Thu, 24 Jul 2014 20:04:23 +0000 (24 13:04 -0700)
tree8d9eb7b03d86281f8e468709d2fad6448b5e3b73
parent98401fa9f1e2083708c78bcc2d0d41ca4dbda042
Fix ubuntu (probably newer gcc) folly check

Summary: use cxx check compiles not c check compiles for folly weak symbols check
this is failing on some os/gcc combinations

Reviewed By: @JoelMarcey

Differential Revision: D1456030
CMake/HPHPSetup.cmake