From 0e92d190cc668da3337e6d62a726f442d06bdda0 Mon Sep 17 00:00:00 2001
From: James Shubin <james@shubin.ca>
Date: Thu, 25 Apr 2024 12:38:50 -0400
Subject: [PATCH] make: Add easy error message for common issue

This can happen if the golang tools are angry. Make it easier for the
user to debug and fix.
---
 Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Makefile b/Makefile
index 346e20b0..b8972000 100644
--- a/Makefile
+++ b/Makefile
@@ -225,6 +225,8 @@ build-debug: $(PROGRAM)
 GOOS=$(firstword $(subst -, ,$*))
 GOARCH=$(lastword $(subst -, ,$*))
 build/mgmt-%: $(GO_FILES) $(MCL_FILES) go.mod go.sum | lang funcgen
+	@# If you need to run `go mod tidy` then this can trigger.
+	@if [ "$(PKGNAME)" = "" ]; then echo "\$$(PKGNAME) is empty, test with: go list ."; exit 42; fi
 	@echo "Building: $(PROGRAM), os/arch: $*, version: $(SVERSION)..."
 	time env GOOS=${GOOS} GOARCH=${GOARCH} go build $(TRIMPATH) -ldflags=$(PKGNAME)="-X main.program=$(PROGRAM) -X main.version=$(SVERSION) ${LDFLAGS}" -o $@ $(BUILD_FLAGS)