From 548b8ca62c64a16305929e2eaf3d546d48de9c25 Mon Sep 17 00:00:00 2001
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From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Date: Tue, 21 Feb 2017 19:46:24 +0100
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Subject: [PATCH] adb: Fix build on big endian systems
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The usb_linux_client.c file defines cpu_to_le16/32 by using the C
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library htole16/32 function calls. However, cpu_to_le16/32 are used
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when initializing structures, i.e in a context where a function call
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is not allowed.
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It works fine on little endian systems because htole16/32 are defined
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by the C library as no-ops. But on big-endian systems, they are
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actually doing something, which might involve calling a function,
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causing build failures.
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To solve this, we simply open-code cpu_to_le16/32 in a way that allows
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them to be used when initializing structures.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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---
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adb/usb_linux_client.c | 11 +++++++++--
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1 file changed, 9 insertions(+), 2 deletions(-)
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diff --git a/adb/usb_linux_client.c b/adb/usb_linux_client.c
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index 8426e0ea14..6e8b5bbbd2 100644
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--- a/adb/usb_linux_client.c
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+++ b/adb/usb_linux_client.c
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@@ -34,8 +34,15 @@
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#define MAX_PACKET_SIZE_FS 64
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#define MAX_PACKET_SIZE_HS 512
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-#define cpu_to_le16(x) htole16(x)
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-#define cpu_to_le32(x) htole32(x)
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+#if __BYTE_ORDER == __LITTLE_ENDIAN
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+# define cpu_to_le16(x) (x)
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+# define cpu_to_le32(x) (x)
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+#else
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+# define cpu_to_le16(x) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
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+# define cpu_to_le32(x) \
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+ ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \
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+ (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24))
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+#endif
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struct usb_handle
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{
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