buildroot/package/android-tools/0006-Fix-build-on-big-endian-systems.patch

From 8f7e9458dbfca969d3edc9cf409b3439e98f4c5a Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Sun, 1 Dec 2024 15:45:26 +0100
Subject: [PATCH] Fix build on big endian systems

The usb_linux_client.c file defines cpu_to_le16/32 by using the C
library htole16/32 function calls. However, cpu_to_le16/32 are used
when initializing structures, i.e in a context where a function call
is not allowed.

It works fine on little endian systems because htole16/32 are defined
by the C library as no-ops. But on big-endian systems, they are
actually doing something, which might involve calling a function,
causing build failures.

To solve this, we simply open-code cpu_to_le16/32 in a way that allows
them to be used when initializing structures.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 core/adb/usb_linux_client.c  | 11 +++++++++--
 core/adbd/usb_linux_client.c | 11 +++++++++--
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/core/adb/usb_linux_client.c b/core/adb/usb_linux_client.c
index fb1dad0..a981e96 100644
--- a/core/adb/usb_linux_client.c
+++ b/core/adb/usb_linux_client.c
@@ -34,8 +34,15 @@
 #define MAX_PACKET_SIZE_FS	64
 #define MAX_PACKET_SIZE_HS	512
 
-#define cpu_to_le16(x)  htole16(x)
-#define cpu_to_le32(x)  htole32(x)
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+# define cpu_to_le16(x) (x)
+# define cpu_to_le32(x) (x)
+#else
+# define cpu_to_le16(x) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
+# define cpu_to_le32(x) \
+	((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >>  8) | \
+	 (((x) & 0x0000ff00u) <<  8) | (((x) & 0x000000ffu) << 24))
+#endif
 
 struct usb_handle
 {
diff --git a/core/adbd/usb_linux_client.c b/core/adbd/usb_linux_client.c
index 33875a8..0e4d200 100644
--- a/core/adbd/usb_linux_client.c
+++ b/core/adbd/usb_linux_client.c
@@ -34,8 +34,15 @@
 #define MAX_PACKET_SIZE_FS	64
 #define MAX_PACKET_SIZE_HS	512
 
-#define cpu_to_le16(x)  htole16(x)
-#define cpu_to_le32(x)  htole32(x)
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+# define cpu_to_le16(x) (x)
+# define cpu_to_le32(x) (x)
+#else
+# define cpu_to_le16(x) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
+# define cpu_to_le32(x) \
+	((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >>  8) | \
+	 (((x) & 0x0000ff00u) <<  8) | (((x) & 0x000000ffu) << 24))
+#endif
 
 struct usb_handle
 {
-- 
2.47.0