59068ee4c examples/fractal.cpp: Don't use rand()
7df53dd16 Add primes example
ded37ceb8 Update README.md with build instructions
b80c797df CMakeLists.txt: Don't default to building tests.
d89fe34b6 CMakeLists.txt: Use explicit file lists
757566df0 Update README.md
8c98371e5 Presubmits: Enable warnings-as-errors.
0025389a1 CMakeLists: Add option to treat warnings as errors
eeb070293 Fix all compiler warnings

git-subtree-dir: third_party/marl
git-subtree-split: 59068ee4cf1f5ff5e691ff010c8d83b5f862c4fa

git-subtree-dir: third_party/marl
git-subtree-split: d3b8558ce8d2cf2cad1009a99aa3ff453b048639