From e292e0452fcfd5a8ae055b59052fc041cbab4abf Mon Sep 17 00:00:00 2001
From: Rob Earhart <rob@vertex.ai>
Date: Sat, 6 Jan 2018 21:32:32 -0800
Subject: [PATCH] Use += for appends

---
 bazel/gflags.bzl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/bazel/gflags.bzl b/bazel/gflags.bzl
index 6d1ef6c..533fd61 100644
--- a/bazel/gflags.bzl
+++ b/bazel/gflags.bzl
@@ -85,13 +85,13 @@ def gflags_library(hdrs=[], srcs=[], threads=1):
     })
     linkopts = []
     if threads:
-        linkopts = linkopts + select({
+        linkopts += select({
             "//:x64_windows": [],
             "//conditions:default": ["-lpthread"],
         })
     else:
         name += "_nothreads"
-        copts = copts + ["-DNO_THREADS"]
+        copts += ["-DNO_THREADS"]
     native.cc_library(
         name       = name,
         hdrs       = hdrs,