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-rw-r--r--absl/base/config.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/absl/base/config.h b/absl/base/config.h
index 2a14fe740630..f12f84fde6b2 100644
--- a/absl/base/config.h
+++ b/absl/base/config.h
@@ -181,6 +181,13 @@
 #endif
 #endif  // defined(__ANDROID__) && defined(__clang__)
 
+// Emscripten doesn't yet support `thread_local` or `__thread`.
+// https://github.com/emscripten-core/emscripten/issues/3502
+#if defined(__EMSCRIPTEN__)
+#undef ABSL_HAVE_TLS
+#undef ABSL_HAVE_THREAD_LOCAL
+#endif  // defined(__EMSCRIPTEN__)
+
 // ABSL_HAVE_INTRINSIC_INT128
 //
 // Checks whether the __int128 compiler extension for a 128-bit integral type is