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Makefile Error on Windows: Unsupported GOOS/GOARCH pair linux/amd64 When Building Go Project?

Makefile Error on Windows: Unsupported GOOS/GOARCH pair linux/amd64 When Building Go Project

I'm working on a Go project on a Windows machine and trying to use a Makefile to build multiple Go Lambda functions for deployment to AWS. My project structure is set up with each Lambda function in a separate directory under src/functions, and each has its own main.go. I'm encountering an issue when running my Makefile's build command in PowerShell through VS Code terminal.

Foler structure

/project-root
  /cdk.out
  /src
    /functions
      /hello
        main.go
      /goodbye
        main.go
  Makefile

Here's the relevant part of my Makefile:

GOOS=linux
GOARCH=amd64

FUNCTIONS_DIR := src/functions
FUNCTIONS := $(notdir $(wildcard $(FUNCTIONS_DIR)/*))

build:
    @echo "Building functions..."
    @$(foreach func, $(FUNCTIONS), \
        GOOS=$(GOOS) GOARCH=$(GOARCH) go build -o $(FUNCTIONS_DIR)/$(func)/bootstrap $(FUNCTIONS_DIR)/$(func)/main.go; \
        echo "Built $(func)/bootstrap"; \
    )

When I run make build, I receive the following error:

"Building functions..."
go: unsupported GOOS/GOARCH pair linux /amd64 
make: *** [Makefile:25: build] Error 2

I am aware that environment variables in Windows should be set differently, and I've tried using both PowerShell and Command Prompt syntaxes with no success.

Here's what I have tried:

PowerShell Syntax:

build:
    @echo "Building functions..."
    @$(foreach func, $(FUNCTIONS), \
        $Env:GOOS='linux'; $Env:GOARCH='amd64'; go build -o $(FUNCTIONS_DIR)/$(func)/bootstrap $(FUNCTIONS_DIR)/$(func)/main.go; \
        echo "Built $(func)/bootstrap"; \
    )

Command Prompt Syntax:

build:
    @echo "Building functions..."
    @$(foreach func, $(FUNCTIONS), \
        set GOOS=linux && set GOARCH=amd64 && go build -o $(FUNCTIONS_DIR)/$(func)/bootstrap $(FUNCTIONS_DIR)/$(func)/main.go; \
        echo "Built $(func)/bootstrap"; \
    )

I've confirmed that Go is installed correctly, and the go build command works fine when run directly in the terminal for a single function directory.

How can I adjust my Makefile to correctly set environment variables and build my project on Windows?

Solution:

The first thing you should do is remove the @ at the beginning of your makefile recipes, so you can see the actual commands that are being invoked, and check carefully that they contain what you expect. Using @ is like running your compiler with output redirected to /dev/null so you can't see the output then trying to figure out what's wrong.

In your case, the problem is that $ is a special character to make; it introduces a make variable. So in this line:

$Env:GOOS='linux'; $Env:GOARCH='amd64'

the $ is expanded by make and since $E is an empty variable, make will invoke:

nv:GOOS='linux'; nv:GOARCH='amd64'

which is wrong. If you hadn't added the @ then make would show you this incorrect text.

You need to double the dollar sign to escape it:

$$Env:GOOS='linux'; $$Env:GOARCH='amd64'