Add profile release

[Luni-4]

This PR adds a profile.release-opt to reduce binaries size, but at the same time enables some optimizations.
Using this profile, I was able to reduce the bezier_tool binary from 15.6 MB to 7.1MB, I haven't checked the other binaries though.

To use the profile:

cargo build --profile release-opt

I hope this is appreciated, thanks in advance for your review!

[Luni-4]

@hecrj Is there any update on this one?

[hecrj]

I understand this improves the release profile for the examples at the cost of compilation time, but the default configuration is still valuable during development as we may want to build in release mode as well.

Instead, I believe we should mention these settings somewhere in our documentation or book.

[Luni-4]

Yeah, I understand what you're saying, since release mode might be used in the development phase too, increasing the compilation time could not be an optimal solution.

Perhaps we can explore the new custom profiles feature in order to reduce binary sizes

We could have something like this:

cargo build --profile release-less-binary-size

In this way we don't affect the default release profile at all. What do you think of this solution @hecrj?

We can also add the release configurations of this PR and the new custom profiles in documentation or iced book.

[hecrj]

In this way we don't affect the default release profile at all. What do you think of this solution @hecrj?

That sounds great. If we can just have these settings in a release-opt profile then that would be awesome:

[profile.release-opt]
inherits = "release"
codegen-units = 1
debug = false
lto = true
incremental = false
opt-level = 3
overflow-checks = false
strip = "debuginfo"

[Luni-4]

That sounds great. If we can just have these settings in a release-opt profile then that would be awesome:

[profile.release-opt]
inherits = "release"
codegen-units = 1
debug = false
lto = true
incremental = false
opt-level = 3
overflow-checks = false
strip = "debuginfo"

That's great! Thank you!

Do you also want me to create a ci-profile to remove those lines https://github.com/iced-rs/iced/blob/master/.github/workflows/build.yml#L93-L96 ? I can do that in another PR if you prefer

[hecrj]

Do you also want me to create a ci-profile to remove those lines https://github.com/iced-rs/iced/blob/master/.github/workflows/build.yml#L93-L96 ?

Actually, we can just use the new custom profile! I just did that in 7022090.

[hecrj]

Looks great now! Thank you! 🥳