[Buildroot] GOLANG Compilation Issue: build constraints exclude all Go files

[Sven Klomp]

Hello

On 12.02.21 10:18, Sven Klomp wrote:
> can't load package: package github.com/syncthing/syncthing: build 
> constraints exclude all Go files in 
> /[...]/build/syncthing-1.13.1/_gopath/src/github.com/syncthing/syncthing

With some help from the Syncthing forum I came to the conclusion, that 
"golang-package" tries to compile the source with "go build" whereas 
Syncthing requires "go run build.do -arch arm build".

Thus, I define SYNCTHING_BUILD_CMDS
     define SYNCTHING_BUILD_CMDS
         cd $(SYNCTHING_SRC_PATH); \
         $(GO_TARGET_ENV) \
         $(GO_BIN) run build.go build
     endef

However, this fails with:
     fork/exec /tmp/go-build567270573/b001/exe/build: exec format error

This error is somehow related to the environment variable "GOARCH=arm" 
introduced by $(GO_TARGET_ENV).

Best regards