thinlto and c++ static initialization analysis

Clang Frontend Using Clang
1

I am looking at trying out thinlto on our large c++ programs. We have had to do a bunch of careful things to make sure things get linked in the right order to get the static initialization to work right.

Two questions:

Will thinlto honor the command line ordering of files that we set?

In theory, with lto one could build the dependency graph of initializations and guarantee the correct ordering. Has anyone worked on this and are there any plans for this in the future?

thanks in advance,

jerry

2

You're relying on undefined behaviour. If thinlto honor the command
line ordering *today*, there's no guarantee that it will in the
future.
Best to fix the code instead of relying on compiler implementation.

You could use the "undefined" sanitizer to detect so called "static
initialisation 'fiasco' (problem)"
(Standard C++)

My 2 cents.