From 59fb6443a82b84c6b5971b2f45403c78727b7604 Mon Sep 17 00:00:00 2001
From: Michael Chinen <mchinen@google.com>
Date: Thu, 4 Mar 2021 10:49:28 -0800
Subject: [PATCH] BUILD,gflags.bzl: Fix android linking

  Android is a special case where there is no libpthread.so to link against, although the symbols are present in the standard libaries.
  Linking against libpthread.so therefore causes an error.
  This fix uses the config method based on android toolchain that protobuf uses, which also omits -lpthread for linkopts.
    https://github.com/protocolbuffers/protobuf/blob/d16bf914bc5ba569d2b70376051d15f68ce4322d/BUILD#L103
---
 BUILD            | 5 +++++
 bazel/gflags.bzl | 1 +
 2 files changed, 6 insertions(+)

diff --git a/BUILD b/BUILD
index 1bccf5a..25b2318 100644
--- a/BUILD
+++ b/BUILD
@@ -14,6 +14,11 @@ config_setting(
     values = {"cpu": "x64_windows"},
 )
 
+config_setting(
+    name = "android",
+    values = {"crosstool_top": "//external:android/crosstool"},
+)
+
 load(":bazel/gflags.bzl", "gflags_library", "gflags_sources")
 
 (hdrs, srcs) = gflags_sources(namespace = [
diff --git a/bazel/gflags.bzl b/bazel/gflags.bzl
index 4e61c5d..4199e31 100644
--- a/bazel/gflags.bzl
+++ b/bazel/gflags.bzl
@@ -90,6 +90,7 @@ def gflags_library(hdrs = [], srcs = [], threads = 1):
     linkopts = []
     if threads:
         linkopts += select({
+            "//:android": [],
             "//:x64_windows": [],
             "//conditions:default": ["-lpthread"],
         })