在64位系统上编译32位二进制文​​件

I've coded a Go program in a 64 bit system but I want to compile a 32 bit binary!

The 64 bit binary is working just great but I have no idea how to create a 32 bit binary.

How can I do it?

If you built your Go from source, then you can build any additional compilers and libraries for any CPU and OS. If you are on windows/amd64 and want to build for windows/386, then this will build everything you need to compile for windows/386:

set GOARCH=386  
cd %GOROOT%\src  
make.bat --no-clean

Once you have done that, you can build your windows/386 executable with:

set GOARCH=386  
cd %YOUR_PROG_DIR%  
go build

Since you are on windows/amd64, you should be able to even run / test your windows/386 programs too. Just make sure to set GOARCH=386 before you invoke any commands for windows/386.

One caveat: this does not support cgo, so you cannot use any packages that use cgo.

Ok, I've finally solved the problem! Here it is how I did it(I was miserably failing actualy!).

  • First thing I did was to download GCC from http://www.mingw.org/.

  • Next add C:\MinGW\bin to the PATH environment variable(I'm assuming that MinGW is installed in C:\MinGw)

  • Next thing before running go build/go install is to set the enviroment variables.

  • Open the command prompt and go to C:\Go\src and run all.bat from the command line.
  • Then you have to set GOOS, GOARCH and CGO_ENABLED to windows, 386 and 0 respectively!(you should also set GOPATH to the path where your current Go project is).
  • Next run make.bat and make.bat --no-clean After that you can build your project for 32 bit systems! I hope this is helpful!

The way I have achieved this (without any compiling of the compiler) on my Windows 7 64 bit PC was first having the windows amd64 installed, then download 32bit zip and unpack to a second folder:

\go\go32
\go\go64

By then adjusting the PATH and the GOROOT inside my command prompt window as follows:

set PATH=\go\go32;%PATH%
set GOROOT=\go\go32\

Then I went back and recompiled my app that was previously compiling using the 64 bit. All this can be setup in a batch if you want to switch between regularly.