“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 ver

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.

Answer 2

I have the exact same problem, running this command solves it:

go get -u -v github.com/mattn/go-sqlite3

Another tip: http://kokizzu.blogspot.co.id/2016/06/solution-for-golang-slow-compile.html

Answer 3

If you try as all other said but still not work, I suggest removing the directory of $GOPATH such as :

sudo rm -rf $GOPATH
cd yourproject 
go get -d
go get -u -v github.com/mattn/go-sqlite3

Answer 4

You can build sqlite3 like this:

cd ./vendor/github.com/mattn/go-sqlite3/
go install

After that your project will b built much faster.

Answer 5

Using go1.6,

Simply run go build -i.

It will compile all the dependencies and store them at $GOPATH/pkg/*/* as .a files.

Later when you run go run main.go, everything is much faster.

What s really great is that if you use vendored dependencies (IE: a vendor folder in your project), deps are built appropriately within $GOPATH/pkg/**/yourproject/vendor/**

So you don t have to go get install/get/whatever and have a mix of vendor / global dependencies.

I suspect you got to re-build .a files after deps update (glide update or smthg like this), but i did not test that yet.

Answer 6

I just experienced the same problem - updating from 1.4 to 1.5. It seems that the olds versions are somehow incompatible or are being rebuild every time as go build -x shows. Executing go get -v invalidates all packages or refetches them, I am not quite sure and go build -x shows quite less output.