v3 empty binary size is +3Mb #2046

abitrolly · 2025-01-24T08:44:14Z

abitrolly
Jan 24, 2025
Maintainer

Why empty v3 project is so big?

-rwxr-xr-x.   1 anatoli anatoli 1523883 Jan 24 11:34 00empty
-rwxr-xr-x.   1 anatoli anatoli 2732071 Jan 24 11:33 00empty-cobra
-rwxr-xr-x.   1 anatoli anatoli 4839568 Jan 24 11:37 00empty-urfave

00empty.go

package main

func main() {
}

00empty-cobra.go

package main

import "github.com/spf13/cobra"

func main() {
	_ = &cobra.Command{}
}

00empty-urfave.go

package main

import "github.com/urfave/cli/v3"

func main() {
	_ = &cli.Command{}
}

Skeeve · 2025-01-24T08:46:31Z

Skeeve
Jan 24, 2025
Maintainer

Maybe because it has so much to offer compared to other libraries?

2 replies

abitrolly Jan 24, 2025
Maintainer Author

But Go should tree shake all unused stuff.

https://www.reddit.com/r/golang/comments/yzpbcj/does_the_go_compiler_use_tree_shaking/

Skeeve Jan 24, 2025
Maintainer

I have no clue. Maybe there are some inits?

dearchap · 2025-01-25T23:29:28Z

dearchap
Jan 25, 2025
Maintainer

@abitrolly Interesting. The CI reports following

1.9MB is the current binary size
  ✅ 1.5MB is the target min size
  ✅ 2.2MB is the target max size

2 replies

abitrolly Jan 25, 2025
Maintainer Author

➜  ~ cd /tmp
➜  /tmp mkdir 111
➜  /tmp cd 111
➜  111 go mod init
go: cannot determine module path for source directory /tmp/111 (outside GOPATH, module path must be specified)

Example usage:
        'go mod init example.com/m' to initialize a v0 or v1 module
        'go mod init example.com/m/v2' to initialize a v2 module

Run 'go help mod init' for more information.
➜  111 go mod init xxx
go: creating new go.mod: module xxx
➜  111 wl-paste > main.go
➜  111 go get github.com/urfave/cli/v3@latest
go: added github.com/urfave/cli/v3 v3.0.0-beta1
➜  111 go build
➜  111 ls -la
total 4740
drwxr-xr-x.  2 anatoli anatoli     120 Jan 26 02:34 .
drwxrwxrwt. 22 root    root        520 Jan 26 02:34 ..
-rw-r--r--.  1 anatoli anatoli      81 Jan 26 02:34 go.mod
-rw-r--r--.  1 anatoli anatoli     179 Jan 26 02:34 go.sum
-rw-r--r--.  1 anatoli anatoli      85 Jan 26 02:33 main.go
-rwxr-xr-x.  1 anatoli anatoli 4839568 Jan 26 02:34 xxx
➜  111

I don't know what CI is doing.

abitrolly Jan 25, 2025
Maintainer Author

My Go is from Homebrew FWIW.

dearchap · 2025-01-26T14:04:51Z

dearchap
Jan 26, 2025
Maintainer

@abitrolly Here is the relevant optimization

cli/scripts/build.go

Line 662 in 435b91c

"-ldflags", "-s -w",

You have to pass in

go build -ldflags="-s -w"

That disables the symbol table and dwarf generation.

1 reply

abitrolly Jan 26, 2025
Maintainer Author

That doesn't explain why cobra binary size is less even without optimization. And why Go doesn't do tree shaking to realize there is nothing called at all.

F75C

v3 empty binary size is +3Mb #2046

Uh oh!

Uh oh!

abitrolly Jan 24, 2025 Maintainer

Replies: 3 comments · 5 replies

Uh oh!

Skeeve Jan 24, 2025 Maintainer

Uh oh!

abitrolly Jan 24, 2025 Maintainer Author

Uh oh!

Skeeve Jan 24, 2025 Maintainer

Uh oh!

dearchap Jan 25, 2025 Maintainer

Uh oh!

abitrolly Jan 25, 2025 Maintainer Author

Uh oh!

abitrolly Jan 25, 2025 Maintainer Author

Uh oh!

Uh oh!

dearchap Jan 26, 2025 Maintainer

Uh oh!

abitrolly Jan 26, 2025 Maintainer Author

abitrolly
Jan 24, 2025
Maintainer

Replies: 3 comments 5 replies

Skeeve
Jan 24, 2025
Maintainer

abitrolly Jan 24, 2025
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Skeeve Jan 24, 2025
Maintainer

dearchap
Jan 25, 2025
Maintainer

abitrolly Jan 25, 2025
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abitrolly Jan 25, 2025
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dearchap
Jan 26, 2025
Maintainer

abitrolly Jan 26, 2025
Maintainer Author