How to compile Go program consisting of multiple files

Question

I have a small program that consists of three files  all belonging to the same package  main   but when I do  go build main go  the build doesn t succeed  When it was just one file  main go  everything worked fine  Now that I took some effort to separate the code  it looks like the compiler is unable to find the stuff that was taken out of main go and put into these two other files  that reside at the same directory as the main go   Which results in  undefined  type   errors   How to compile this program that is consisting of multiple files

User · Answer

You can use   go build   go  go run   go   both will work also you may use  go build   go run

User · Answer

When you separate code from main go into for example more go  you simply pass that file to go build go run go install as well   So if you previously ran  go build main go   you now simply  go build main go more go     As further information   go build --help   states      If the arguments are a list of  go files    build treats them as a list of source files specifying a single package      Notice that go build and go install differ from go run in that the first two state to expect package names as arguments  while the latter expects go files  However  the first two will also accept go files as go install does   If you are wondering  build will just build the packages files  install will produce object and binary files in your GOPATH  and run will compile and run your program

User · Answer

You could also just run   go build   in your project folder myproject go src myprog  Then you can just type    myprog   to run your app

User · Answer

It depends on your project structure  But most straightforward is  go build -o   myproject        then run   myproject  Suppose your project structure looks like this - hello  - main go  then you just go to the project directory and run go build -o   myproject  then run   myproject on shell  or   most easiest  builds and run simultaneously go run main go  suppose your main file is nested into a sub-directory like a cmd - hello  - cmd   - main go  then you will run go run cmd main go

User · Answer

New Way  Recommended    Please take a look at this answer   Old Way   Supposing you re writing a program called myprog    Put all your files in a directory like this  myproject go src myprog xxx go   Then add myproject go to GOPATH  And run   go install myprog   This way you ll be able to add other packages and programs in myproject go src if you want   Reference   http   golang org doc code html   this doc is always missed by newcomers  and often ill-understood at first  It should receive the greatest attention of the Go team IMO

User · Answer

Yup  That s very straight forward and that s where the package strategy comes into play  there are three ways to my knowledge  folder structure   GOPATH src            github com            abc            myproject                  adapter                      main go                     pkg1                     pkg2 warning  adapter can contain package main only and sun directories   navigate to  adapter  folder  Run        go build main go    navigate to  adapter  folder  Run        go build main go    navigate to GOPATH src recognize relative path to package main  here  myproject adapter   Run        go build myproject adapter   exe file will be created at the directory you are currently at

User · Answer

Since Go 1 11   GOPATH is no longer recommended  the new way is using Go Modules   Say you re writing a program called simple    Create a directory   mkdir simple cd simple  Create a new module   go mod init github com username simple   Here  the module name is  github com username simple    You re free to choose any module name    It doesn t matter as long as it s unique    It s better to be a URL  so it can be go-gettable   Put all your files in that directory  Finally  run   go run    Alternatively  you can create an executable program by building it   go build      then    simple       if you re on xnix    or  just  simple         if you re on Windows    For more information  you may read this      Go has included support for versioned modules as proposed here since 1 11  The initial prototype vgo was announced in February 2018  In July 2018  versioned modules landed in the main Go repository    In Go 1 14  module support is considered ready for production use  and all users are encouraged to migrate to modules from other dependency management systems

[go] How to compile Go program consisting of multiple files?

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