From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <50E062E8.6030903@openwide.fr>
Date: Sun, 30 Dec 2012 16:51:04 +0100
From: Romain Naour <romain.naour@openwide.fr>
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Subject: [Xenomai] Xenomai 2.6.2 user-space compilation error on ARM < armv6
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To: xenomai@xenomai.org

Hi Gilles,

First of all, thank you for the new release of Xenomai :)

I'm compiling Xenomai 2.6.2 and Linux kernel 3.5.3 for mini2440 with buildroot 2012.11.

During compilation I get the following error:
error: #error "SMP not supported below armv6, compile with -march=armv6 or above"

This error is caused by the SMP mode which is now enabled by default on ARM.
So I added the option --disable-smp on the buildroot's command line for ./configure
(buildroot assumes that the SMP mode is not enabled when it compile Xenomai for arm) 

This option became mandatory for ARM < armv6 to pass this test: (xenomai-2.6/include/asm-arm/feature.h)

#if __LINUX_ARM_ARCH__ < 6 && defined(CONFIG_SMP)
#error "SMP not supported below armv6, compile with -march=armv6 or above"
#endif

The error message may be advisable to add the option --disable-smp ?
However, since your objective is to allow to run the same binary on UP and SMP system, it is safe to remove this test for ARM < armv6 now ?

Regards,
Romain