linux-kernel - [PATCH] ARM: fix vdsomunge depends on glibc specific byteswap.h

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Message-Id: <2039A9BE-ADA4-4D28-84F4-C8B9D76834AD@goldelico.com>
Date:	Wed, 30 Sep 2015 17:56:41 +0200
From:	"H. Nikolaus Schaller" <hns@...delico.com>
To:	Szabolcs Nagy <szabolcs.nagy@....com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Nathan Lynch <nathan_lynch@...tor.com>,
	Will Deacon <will.deacon@....com>
Cc:	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Marek Belisko <marek@...delico.com>
Subject: [PATCH] ARM: fix vdsomunge depends on glibc specific byteswap.h

If the host toolchain is not glibc based then the arm kernel build
fails with

 HOSTCC  arch/arm/vdso/vdsomunge
 arch/arm/vdso/vdsomunge.c:48:22: fatal error: byteswap.h: No such file or directory

Observed with omap2plus_defconfig and compile on Mac OS X with arm ELF
cross-compiler.

Reason: byteswap.h is a glibc only header.

Changed to detect the host and include the right file as described at:

 https://bugs.freedesktop.org/show_bug.cgi?id=8882

Tested to compile on Mac OS X 10.9.5 host.

Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
---
arch/arm/vdso/vdsomunge.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/arch/arm/vdso/vdsomunge.c b/arch/arm/vdso/vdsomunge.c
index aedec81..5364cea 100644
--- a/arch/arm/vdso/vdsomunge.c
+++ b/arch/arm/vdso/vdsomunge.c
@@ -45,7 +45,25 @@
 * it does.
 */

+#if defined(__linux__)
#include <byteswap.h>
+#elif defined(__OpenBSD__)
+#include <sys/endian.h>
+#define bswap_16 __swap16
+#define bswap_32 __swap32
+#define bswap_64 __swap64
+#elif defined(__APPLE__)
+#include <libkern/OSByteOrder.h>
+#define bswap_16 OSSwapInt16
+#define bswap_32 OSSwapInt32
+#define bswap_64 OSSwapInt64
+#else
+#include <sys/endian.h>
+#define bswap_16 bswap16
+#define bswap_32 bswap32
+#define bswap_64 bswap64
+#endif
+
#include <elf.h>
#include <errno.h>
#include <fcntl.h>
-- 
2.5.1

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