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Message-ID: <1799b81c-10d6-c2ac-4411-6ee9808f2356@codeaurora.org>
Date: Tue, 27 Feb 2018 16:03:19 -0800
From: "Zhao, Weiming" <weimingz@...eaurora.org>
To: musl@...ts.openwall.com
Subject: clz instruction is unavailable for Thumb1
In arch/arm/atomic_arch.h, it checks for __ARM_ARCH >= 5, which is not
sufficient.
for example, for armv6-m, it only support Thumb1, which doesn't include clz.
Suggest to check if it's building for thumb1:
diff --git a/arch/arm/atomic_arch.h b/arch/arm/atomic_arch.h
index c5c56f8..e3cb66a 100644
--- a/arch/arm/atomic_arch.h
+++ b/arch/arm/atomic_arch.h
@@ -82,7 +82,7 @@ static inline void a_crash()
: : : "memory");
}
-#if __ARM_ARCH >= 5
+#if __ARM_ARCH >= 5 && !(defined(__thumb__) && !defined(__thumb2))
--
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