rustc produce considerably bigger release binaries after rustc 1.14.0-nightly (3caf63cc0 2016-10-24)

[ghost]

Mentioned on /r/rust

My little project for example:
rustc +nightly-2016-10-21 -O: 652K
rustc +nightly-2016-10-26 -O: 1.9M

Sizes after strip are the same (368K)

[michaelwoerister]

Thanks for the report! We should definitely look into that.

cc @rust-lang/compiler @rust-lang/tools

[michaelwoerister]

The change must have been introduced somewhere in this range: f094206...3caf63c

[eddyb]

My bet is on 803576c. If libstd is statically linked and it contains debug symbols, those add to the size, right?

[michaelwoerister]

That could well be the cause.

[michaelwoerister]

I can confirm @eddyb's hunch, it's the debuginfo for stdlibs which is causing the increased size. I'll add it to the list of reasons to have MIR-only rlibs (#38913).

[alexcrichton]

Thanks for the confirmation @michaelwoerister! With that in mind I feel that there's not a lot we can do about this because we don't want to remove the debug info from libstd yet.

[Mark-Simulacrum]

We found the problem and decided to not do anything at least for now so I think closing makes sense for the time being.