Commits

Wes McKinney authored b5ff2f6b4cc
ARROW-1251: [C++] Update C++ README to account for toolchain evolution Author: Wes McKinney <wes.mckinney@twosigma.com> Closes #919 from wesm/ARROW-1251 and squashes the following commits: b0698379 [Wes McKinney] Update C++ README to account for toolchain evolution