Re: [PATCH datacenter-manager 2/3] ui: d/rules: use thin instead of fat LTO

["Fabian Grünbichler" <f.gruenbichler@proxmox.com>]

On July 6, 2026 1:44 pm, Dominik Csapak wrote:
> fat LTO merges all LLVM modules into a single unit for optimizing.
> Changing this to thin LTO increases the uncompressed binary size by 1.59
> MiB (+11%) (compressed +192KiB/+4.6%) but save us ~160s (-40%) of (wall)
> build time during a 'make deb'.

but what are the effects on runtime performance? the same question also
applies to the next patch, a single codegen unit increases the amount of
optimizations the compiler can do..

> Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
> ---
>  ui/debian/rules | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/ui/debian/rules b/ui/debian/rules
> index b3b3b078..8ffa868a 100755
> --- a/ui/debian/rules
> +++ b/ui/debian/rules
> @@ -28,7 +28,7 @@ endif
>  
>  	$(CARGO) prepare-debian $(CURDIR)/debian/cargo_registry --link-from-system
>  	sed -e 's/^debug = true$$/debug = false/g' debian/cargo_home/config.toml
> -	echo "\nlto=\"fat\"" >> debian/cargo_home/config.toml
> +	echo "\nlto=\"thin\"" >> debian/cargo_home/config.toml
>  	echo "\nopt-level=\"s\"" >> debian/cargo_home/config.toml
>  	echo "\ncodegen-units=1" >> debian/cargo_home/config.toml
>  	# patch cargo_home config to use lld with wasm, otherwise the build fails
> -- 
> 2.47.3
> 
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