From 1a447fdce72f9198106cb4193eb2f2e317bf2cad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nenad=20Miks=CC=8Ca?= <nenad.miksa@microblink.com>
Date: Sun, 31 Aug 2025 10:53:41 +0200
Subject: [PATCH] avoid `-lpthread` link option when building with emscripten
 without threads

- having this flag causes emscripten to generate binary with pthread
  support, which is not compatible with browsers that do not support
  pthreads or with web pages that do not enable pthread support
---
 BUILD.bazel | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/BUILD.bazel b/BUILD.bazel
index 03392c6b..9527fad3 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -58,6 +58,16 @@ config_setting(
     constraint_values = ["@platforms//os:openbsd"],
 )
 
+config_setting(
+    name = "emscripten_without_threads",
+    constraint_values = [
+        "@platforms//os:emscripten",
+    ],
+    values = {
+        "features": "-use_pthreads",
+    },
+)
+
 # NOTE: Fuchsia is not an officially supported platform.
 config_setting(
     name = "fuchsia",
@@ -113,10 +123,12 @@ cc_library(
     copts = select({
         ":qnx": [],
         ":windows": [],
+        ":emscripten_without_threads": [],
         "//conditions:default": ["-pthread"],
     }),
     defines = select({
         ":has_absl": ["GTEST_HAS_ABSL=1"],
+        ":emscripten_without_threads": ["GTEST_HAS_PTHREAD=0"],
         "//conditions:default": [],
     }),
     features = select({
@@ -140,6 +152,7 @@ cc_library(
             "-lm",
             "-pthread",
         ],
+        ":emscripten_without_threads": [],
         "//conditions:default": ["-pthread"],
     }),
     deps = select({