Go 1.22 binary size improvements?

[cpu...@gmail.com]

I was surprised to see my application (MacOS binary) go from 93MB to 81MB (no PGO). Release notes don't mention this.

Has anyone made similar experience or knows why that is?

Thanks,

Andi

[qiulaidongfeng]

Quick search to find go1.22 as follows  CL  like  https://go-review.googlesource.com/c/go/+/521615   reduces binary size. However, from 93MB to 81MB, I think it is most likely the result of the joint efforts of many CLs.

[cpu...@gmail.com]

It's really surprising (positively). Compiling with -ldflags='-s -w' if anyone wants to try this.

[cpu...@gmail.com]

Just gave it another try cross-compiling to Arm on Linux. This time binary size stays the same. Sorry if my excitement was too premature.

[Brian Candler]

Have you at any point set CGO_ENABLED=0 ?

What does "ldd /path/to/binary" show on both the old (larger) and new (smaller) binaries?  Maybe one is dynamically linked and the other statically linked?

[cpu...@gmail.com]

Yes, CGO is disabled. ldd doesn't seem to exist on MacOS:

make build && ls -la ./evcc && otool -L ./evcc

1.21.7

CGO_ENABLED=0 go build -v -tags=release -trimpath -ldflags='-X github.com/evcc-io/evcc/server.Version=0.124.1 -X github.com/evcc-io/evcc/server.Commit=596071b42 -s -w'
-rwxr-xr-x  1 andig  staff  93824418  9 Feb 14:38 ./evcc
./evcc:
    /usr/lib/libSystem.B.dylib (compatibility version 0.0.0, current version 0.0.0)
    /usr/lib/libresolv.9.dylib (compatibility version 0.0.0, current version 0.0.0)
    /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 0.0.0, current version 0.0.0)
    /System/Library/Frameworks/Security.framework/Versions/A/Security (compatibility version 0.0.0, current version 0.0.0)

1.22.0

CGO_ENABLED=0 go build -v -tags=release -trimpath -ldflags='-X github.com/evcc-io/evcc/server.Version=0.124.1 -X github.com/evcc-io/evcc/server.Commit=596071b42 -s -w'
-rwxr-xr-x  1 andig  staff  81119026  9 Feb 14:37 ./evcc
./evcc:
    /usr/lib/libSystem.B.dylib (compatibility version 0.0.0, current version 0.0.0)
    /usr/lib/libresolv.9.dylib (compatibility version 0.0.0, current version 0.0.0)
    /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 0.0.0, current version 0.0.0)
    /System/Library/Frameworks/Security.framework/Versions/A/Security (compatibility version 0.0.0, current version 0.0.0)

[Brian Candler]

Sorry you're right, it's "otool -L" for macOS.

And you say that if you cross-compile from Linux with 1.22.0 to build a macOS binary, you get a size approx 93.8MB as well? Very odd.