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-rw-r--r--absl/base/config.h14
1 files changed, 9 insertions, 5 deletions
diff --git a/absl/base/config.h b/absl/base/config.h
index 87e403ad..500bc8c8 100644
--- a/absl/base/config.h
+++ b/absl/base/config.h
@@ -138,12 +138,16 @@
// supported.
#ifdef ABSL_HAVE_THREAD_LOCAL
#error ABSL_HAVE_THREAD_LOCAL cannot be directly set
-#elif (!defined(__apple_build_version__) || \
- (__apple_build_version__ >= 8000042)) && \
- !(defined(__APPLE__) && TARGET_OS_IPHONE && \
- __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0)
+#elif defined(__APPLE__)
// Notes: Xcode's clang did not support `thread_local` until version
-// 8, and even then not for all iOS < 9.0.
+// 8, and even then not for all iOS < 9.0. Also, Xcode 9.3 started disallowing
+// `thread_local` for 32-bit iOS simulator targeting iOS 9.x.
+// `__has_feature` is only supported by Clang so it has be inside
+// `defined(__APPLE__)` check.
+#if __has_feature(cxx_thread_local)
+#define ABSL_HAVE_THREAD_LOCAL 1
+#endif
+#else // !defined(__APPLE__)
#define ABSL_HAVE_THREAD_LOCAL 1
#endif