Pass DBG=1 to `make` to build for debug

Makefile

@@ -24,6 +24,9 @@ VERSION ?= $(shell git describe --tags --always --dirty)
 # This version-strategy uses a manual value to set the version string
 #VERSION ?= 1.2.3
 
+# Set this to 1 to build a debugger-friendly binary.
+DBG ?=
+
 # These are passed to docker when building and testing.
 HTTP_PROXY ?=
 HTTPS_PROXY ?=
@@ -129,6 +132,7 @@ $(OUTBIN): .go/$(OUTBIN).stamp
 	        ARCH=$(ARCH)                                       \
 	        OS=$(OS)                                           \
 	        VERSION=$(VERSION)                                 \
+	        BUILD_DEBUG=$(DBG)                                 \
 	        ./build/build.sh                                   \
 	    "
 	if ! cmp -s .go/$(OUTBIN) $(OUTBIN); then  \

build/build.sh

@@ -34,9 +34,23 @@ fi
 export CGO_ENABLED=0
 export GOARCH="${ARCH}"
 export GOOS="${OS}"
-export GOFLAGS="-mod=vendor"
 
+if [[ "${BUILD_DEBUG:-}" == 1 ]]; then
+    # Debugging - disable optimizations and inlining
+    gogcflags="all=-N -l"
+    goasmflags=""
+    goldflags=""
+else
+    # Not debugging - trim paths, disable symbols and DWARF.
+    goasmflags="all=-trimpath=$(pwd)"
+    gogcflags="all=-trimpath=$(pwd)"
+    goldflags="-s -w"
+fi
+
+always_ldflags="-X $(go list -m)/pkg/version.VERSION=${VERSION}"
 go install                                                      \
     -installsuffix "static"                                     \
-    -ldflags "-X $(go list -m)/pkg/version.VERSION=${VERSION}"  \
+    -gcflags="${gogcflags}"                                     \
+    -asmflags="${goasmflags}"                                   \
+    -ldflags="${always_ldflags} ${goldflags}"                   \
     ./...