Re: [getdata-devel] alter_entry_scalar3c test fails on big endian platforms

[Dan H. <da...@da...>]

Hi Don,

On Fri, 4 Mar 2016 13:42:25 -0800
"D. V. Wiebe" <ge...@ke...> wrote:

> On Fri, Mar 04, 2016 at 12:29:39PM +0100, Dan Horák wrote:
> > Hello,
> > 
> > when building getdata 0.9.0 and 0.9.1 on Fedora big endian platforms
> > (ppc64, s390, s390x), the alter_entry_scalar3c test fails.
> > 
> > [sharkcz@devel10 test]$ ./alter_entry_scalar3c 
> > E.bitnum = 0 (expected 3)
> > 
> > An example from our s390 buildsystem -
> > http://s390.koji.fedoraproject.org/koji/taskinfo?taskID=2133825
> > 
> > If you need access to such platform or more information, please let
> > me know.
> > 
> > 
> > Thanks
> > 
> > 	Dan
> 
> Hi Dan,
> 
> Thanks for the report.  I'll see what I can figure out.
> 
> The most useful thing would be if you could turn on the debugging
> messages (./configure --enable-debug) and provide me the output of
> "make check" which will produce about 10MB of text.

this is captured build log including "make check" output -
http://fedora.danny.cz/tmp/.build-0.9.1-1.fc25.log.gz

If the code plays with bit-fields in C, then the bits are used
differently between little and big endian arches. You can find the
details in eg. PPC ELF ABI document [1].

[1]
http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html#BITFIELD


	With regards,

		Dan