From 333de52137cc21175cb1dadb501a943f46c6088d Mon Sep 17 00:00:00 2001
From: Joe Richey <joerichey@google.com>
Date: Mon, 23 Mar 2020 17:19:13 -0700
Subject: [PATCH] Makefile: Use trimpath if available

Passing -trimpath makes the build entirely reproducible.

Signed-off-by: Joe Richey <joerichey@google.com>
---
 Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Makefile b/Makefile
index 014c6105..0dbb8fe9 100644
--- a/Makefile
+++ b/Makefile
@@ -73,6 +73,10 @@ override GO_LINK_FLAGS += $(VERSION_FLAG) -extldflags "$(LDFLAGS)"
 override GO_FLAGS += --ldflags '$(GO_LINK_FLAGS)'
 # Always use Go modules
 export GO111MODULE = on
+# Use -trimpath if available
+ifneq "" "$(shell go help build | grep trimpath)"
+override GO_FLAGS += -trimpath
+endif
 
 ###### Find All Files and Directories ######
 FILES := $(shell find . -path '*/.git*' -prune -o -type f -printf "%P\n")