From e915ab84fd0c02d37504f3eb1e1f3be93ea6dc37 Mon Sep 17 00:00:00 2001
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From: Michael Jeanson <mjeanson@efficios.com>
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Date: Thu, 9 Sep 2021 12:11:16 -0400
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Subject: [PATCH] fix: don't use C++ thread_local on MacOs
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Recent versions of Apple's clang++ do support 'thread_local' but the
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implementation generates additional helper symbols. This is a problem
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when accessing an extern TLS variable in a C++ compile unit that is
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provided by a C library that doesn't have those extra symbols.
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Fallback to using '__thread' on MacOs.
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Change-Id: I87cb5b3c9293f7bf66f7115f453b546dd793a449
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Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
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Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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[Retrieved from:
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https://github.com/urcu/userspace-rcu/commit/e915ab84fd0c02d37504f3eb1e1f3be93ea6dc37]
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Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
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---
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include/urcu/tls-compat.h | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/include/urcu/tls-compat.h b/include/urcu/tls-compat.h
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index 24ef1b9a..25cf375a 100644
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--- a/include/urcu/tls-compat.h
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+++ b/include/urcu/tls-compat.h
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@@ -34,7 +34,12 @@ extern "C" {
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#ifdef CONFIG_RCU_TLS
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-#if defined (__cplusplus) && (__cplusplus >= 201103L)
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+/*
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+ * Don't use C++ 'thread_local' on MacOs, the implementation is incompatible
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+ * with C and will result in a link error when accessing an extern variable
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+ * provided by the C library from C++ code.
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+ */
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+#if defined (__cplusplus) && (__cplusplus >= 201103L) && !defined(__APPLE__)
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# define URCU_TLS_STORAGE_CLASS thread_local
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#elif defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L)
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# define URCU_TLS_STORAGE_CLASS _Thread_local
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