[Xenomai] xenomai 2.6.3 build failure on armhf

Gilles Chanteperdrix gilles.chanteperdrix at xenomai.org
Mon Mar 17 17:30:19 CET 2014

On 03/17/2014 05:27 PM, Lennart Sorensen wrote:
> On Mon, Mar 17, 2014 at 05:10:16PM +0100, Gilles Chanteperdrix wrote:
>> On 03/17/2014 04:59 PM, Lennart Sorensen wrote:
>>> I saw armhf had been added to debian/control in the xenomai-2.6
>>> tree, and since I am trying to get it running there I figured it was
>>> worth pulling that version.  Unfortunately it fails to build with the
>>> same error as 2.6.3 does.
>>> So any idea what this error means:
>>> assert_context.c: In function 'assert_nrt_inner':
>>> assert_context.c:43:1: error: r7 cannot be used in asm here
>>> I am compiling on Debian wheezy armhf.
>>> The command line it used appears to be: /bin/bash ../../../libtool
>>> --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.
>>> -I../../../src/include  -O2 -D_GNU_SOURCE -D_REENTRANT -Wall
>>> -Werror-implicit-function-declaration -pipe -D__XENO__ -D__IN_XENO__
>>> -Wstrict-prototypes -I../../../include -D_FORTIFY_SOURCE=2  -g -O2
>>> -fstack-protector --param=ssp-buffer-size=4 -Wformat
>>> -Werror=format-security -D_FORTIFY_SOURCE=2 -fno-omit-frame-pointer
>>> -MT libxenomai_la-assert_context.lo -MD -MP -MF
>>> .deps/libxenomai_la-assert_context.Tpo -c -o
>>> libxenomai_la-assert_context.lo `test -f 'assert_context.c' || echo
>>> './'`assert_context.c
>>> Debian armhf uses thumb2 mode by default targeting armv7 with
>>> VFP3-D16, in case that is relevant.
>> Could you show us the assembly that the assembler is trying to assemble?
>> (gcc -S)
>> I do not see anything at line 43, but the end of the function
>> itself, but from the look of it, I would say that your build options
>> are incompatible with our macro syscalls. Most probably the
>> -fno-omit-frame-pointer, as I believe r7 is the frame-pointer with
>> thumb (this would have to be checked). If that is true, it will be
>> difficult to fix, as there is no way to detect (at least, last time
>> I checked on x86) at compilation time if omit-frame-pointer is
>> enabled or not, to use different syscall macros.
>> FWIW, as I already said, I routinely compile Xenomai with armhf
>> compilers, and with default options, I have no problems.
> Hmm, so Debian's version of debian/rules has this:
> # necessary from GCC 4.6 on
> CFLAGS += -fno-omit-frame-pointer
> I wonder if they are wrong.

Here we maintain our version of debian/rules, not Debian's, which 
unfortunately contains a lot of cruft like this.


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