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Trying to create a simple package produces the following error on macOS with a newer version of Clang installed:
❯ gopy pkg example.com/hello
go build -v example.com/hello
--- Processing package: example.com/hello ---
gopy: skipping 'main' package "example.com/hello/hello"
--- building package ---
gopy pkg example.com/hello
goimports -w hello.go
go build -mod=mod -buildmode=c-shared -o hello_go.so .
/Users/connor/Code/scratch/scratch013/.venv/bin/python build.py
CGO_CFLAGS="-I/Users/connor/.pyenv/versions/3.13.0/Library/Frameworks/Python.framework/Versions/3.13/include/python3.13" -fPIC -Ofast
CGO_LDFLAGS="-L/Users/connor/.pyenv/versions/3.13.0/lib" "-lpython3.13" -lintl -ldl -L/Users/connor/.pyenv/versions/3.13.0/lib -L/opt/homebrew/lib -Wl,-rpath,/opt/homebrew/lib -framework CoreFoundation
go build -mod=mod -buildmode=c-shared -o _hello.cpython-313-darwin.so .
cmd had error: exit status 1 output:
# runtime/cgo
clang: error: argument '-Ofast' is deprecated; use '-O3 -ffast-math' for the same behavior, or '-O3' to enable only conforming optimizations [-Werror,-Wdeprecated-ofast]
2025/04/30 11:04:07 error dispatching command: exit status 1
The Go package I'm trying to turn into a Python package consists of a single file, hello.go:
// hello is a simple package
package hello
import "fmt"
// Hello greets someone.
func Hello(name string) string {
return fmt.Sprintf("hello %q from Go", name)
}
I believe that I'm using a newer version of Clang installed by Homebrew. This is my first time trying to use pygo, so I'm not sure which version of Clang introduced this incompatibility:
Homebrew clang version 19.1.7
Target: arm64-apple-darwin24.4.0
Thread model: posix
InstalledDir: /opt/homebrew/Cellar/llvm/19.1.7_1/bin
Configuration file: /opt/homebrew/etc/clang/arm64-apple-darwin24.cfg
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