gobuildx86x86-64

How do you build the 8g and 6g Go compilers for Go


I'm writing software that will be somewhat widely deployed amongst Windows, Mac, and Linux systems on x86 and x86-64 architectures. Whenever I set up the go compiler on my Mac and Linux systems I only ever get 6g built. On Windows I just use the pre-built experimental binaries, which uses 8g.

When I get around to setting up build servers, I assume I need to also build 8g so I can produce 32 bit builds as well. How do I set up 8g, in particular on a Mac (since they can be x86 or x64 depending on how old they are)?


Solution

  • As another poster said, use GOARCH. What he didn't say is that you don't need multiple directories.

    Run all.bash twice, same GOROOT:

    GOARCH=amd64 ./all.bash
    GOARCH=386 ./all.bash
    

    When you build something with gomake set up GOARCH if the default doesn't suit you

    GOARCH=386 gomake
    

    Unfortunately goinstall doesn't honor GOARCH yet.

    Notice that gc compilers are always cross compiling. Once you have the compilers for the architecture you need, set GOOS and build the packages in $GOROOT/src/pkg, then you should be able to build your software targeting any operating system or architecture.

    GOARCH=386 GOOS=windows gomake