Linux compile with gcc-6.3: possible?

[bgoodri]

It appears as if the underlying compiler bug was fixed for 8.1 but has not been backported

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69866

And 6.5 was the last release on the g++-6 series a few days ago. LTO is not critical, but there are some benchmarks supporting it

thinLTO / standard benchmarks?

I’ve been using @seantalts 's code in the “perf” branch of cmdstan to do some performance tests, and it seems like thinLTO (a clang feature that tries to get most of the benefit of LTO without impacting compile-time) gives a noticable improvement. Since I’m new around here, my questions are: What’s the standard of evidence used to evaluate performance changes? Is there a standard set of benchmarks that should be run? Using @seantalts 's scripts, here’s the ratio of runtimes for a variety of …

You may be able to install rstan without the -flto flag but add it back to compile Stan programs at runtime.