Bug#995867: xtensor: mipsel FTBFS (relocation truncated to fit: R_MIPS_CALL16)

[Drew Parsons]

On 2021-10-27 10:24, Adrian Bunk wrote:
> On Sat, Oct 09, 2021 at 06:17:54PM +0200, Drew Parsons wrote:
>> Source: xtensor
>> Followup-For: Bug #995867
>> Control: retitle -1 mipsel FTBFS (relocation truncated to fit: 
>> R_MIPS_CALL16)
>> 
>> The problem with undefined `__umodsi3' `__udivsi3' is not easily
>> reproduced.
> 
> While -march=native is kinda OKish for test-only programs that do not
> end up in the binary package, it compiles differently depending on the
> hardware.
> 
> -march=native is known to have this breakage on the oldest buildds
> (eberlin, mipsel-aql-0{1,2}).
> 
...
> 
> The patch below builds for me for mipsel on eller.
> 
> +  export DEB_CXXFLAGS_MAINT_APPEND = -Os -g0
> +BUILD_OPTIONS += -Darch_native_supported=OFF



Thanks Adrian.  My own tests showed that switching off debug symbols was 
the main thing that needed to be done (apart from dealing with the 
relocation truncated issue). Both -O0 and -O2 compile, if -g is switched 
off.

-g0 is more elegant than the make syntax hack I uploaded, so I'll update 
to -Os -g0 for a future upload.

Since these are runtime tests (compiled fresh for the test), I like the 
idea of keeping -march=native, since it will emulate what users will 
experience when they use xtensor in their own local projects.

But I'll apply -Darch_native_supported=OFF for mipsel (that gives a 
cleaner debian/rules than hacking CXXFLAGS with -mxgot)

Drew