On Thu, Jan 03, 2013 at 04:33:03PM +0100, Thomas Petazzoni wrote: > AArch64 is the new 64 bits architecture from ARM, for which a few > definitions are needed in the X.org server to make it build properly. > > Like for the ARM 32 bits architecture, we for now assume that AArch64 > will be used in Little Endian mode for Linux.
Is there a reason for doing so? It should be possible to get this
information from predefined preprocessor macros:
$ arm-unknown-linux-gnueabi-gcc -mlittle-endian -dM -E - < /dev/null |
grep -i arm
#define __ARMEL__ 1
#define __ARM_ARCH_5T__ 1
#define __ARM_PCS 1
#define __arm__ 1
#define __ARM_EABI__ 1
$ arm-unknown-linux-gnueabi-gcc -mbig-endian -dM -E - < /dev/null |
grep -i arm
#define __ARM_ARCH_5T__ 1
#define __ARMEB__ 1
#define __ARM_PCS 1
#define __arm__ 1
#define __ARM_EABI__ 1
So it should be possible to make the byte order conditional on __ARMEL__
and __ARMEB__ respectively. Alternatively there is __BYTE_ORDER__ which
is defined to __ORDER_LITTLE_ENDIAN__ and __ORDER_BIG_ENDIAN__ for
-mlittle-endian and -mbig-endian respectively.
Thierry
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