"go build" became very slow after installing a new version of Go

Question

After upgrading from Go 1.2.1 to 1.3 (Windows 7 64 bit) "go build" execution time has increased from around 4 to over 45 seconds. There were no other changes except the go version update. Switching off the virus scanner seems to have no effect. Any clues?

question from:https://stackoverflow.com/questions/24341654/go-build-became-very-slow-after-installing-a-new-version-of-go

Answer 1

You probably have dependencies that are being recompiled each time. Try go install -a mypackage to rebuild all dependencies.

Removing $GOPATH/pkg also helps to ensure you don't have old object files around.

Building with the -x flag will show you if the toolchain is finding incompatible versions.