Build failure on ARM <5

[Reiner Herrmann <reiner@reiner-h.de>]

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Hi,

musl 1.1.17 fails to build [1] on arm versions <5 because
of an unsupported clz instruction.
The attached patch by Adrian Bunk [2] fixes this issue.

Kind regards,
  Reiner

[1] https://buildd.debian.org/status/fetch.php?pkg=musl&arch=armel&ver=1.1.17-1&stamp=1508450839
[2] https://bugs.debian.org/879190

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From 1e98ea50a49712931c482ca490a0ca38e0501602 Mon Sep 17 00:00:00 2001
From: Adrian Bunk <bunk@debian.org>
Date: Fri, 20 Oct 2017 20:57:23 +0200
Subject: [PATCH] CLZ is only available with ARM >= 5

---
 arch/arm/atomic_arch.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/atomic_arch.h b/arch/arm/atomic_arch.h
index a121010f..c5c56f81 100644
--- a/arch/arm/atomic_arch.h
+++ b/arch/arm/atomic_arch.h
@@ -82,9 +82,13 @@ static inline void a_crash()
 		: : : "memory");
 }
 
+#if __ARM_ARCH >= 5
+
 #define a_clz_32 a_clz_32
 static inline int a_clz_32(uint32_t x)
 {
 	__asm__ ("clz %0, %1" : "=r"(x) : "r"(x));
 	return x;
 }
+
+#endif
-- 
2.15.0.rc1


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