travis builds failing due to rstan compilation issues

My package builds on Linux are failing with the following compilation error for rstan package:

lto-wrapper: fatal error: make returned 2 exit status
compilation terminated.
/usr/bin/ld: lto-wrapper failed
collect2: error: ld returned 1 exit status
make: *** [rstan.so] Error 1
ERROR: compilation failed for package ‘rstan’

How can I modify my travis.yaml to successfully install rstan on Travis?

Build log: https://travis-ci.org/IndrajeetPatil/statsExpressions/builds/638404778?utm_source=github_status&utm_medium=notification

Travis yaml: https://github.com/IndrajeetPatil/statsExpressions/blob/master/.travis.yml

Solution

After trying out many many different permutations and combinations, I finally got Travis builds to succeed, not only by compiling rstan properly but also installing other packages that need compilation so that the log doesn't exceed maximum limit or time out.

Here is the new yaml file for anyone who may run into a similar issue in the future: https://github.com/IndrajeetPatil/statsExpressions/blob/master/.travis.yml