Bug#710336: some observations

[Rene Engelhard <rene@debian.org>]

Hi,

On Sat, Jun 01, 2013 at 11:01:55PM +1200, Michael Cree wrote:
> graphite2 also FTBFS on alpha and sparc64 at debian-ports.  It appears
> to me that the common factor between the build failures (armel,sparc,
> sparc64,alpha) is that they are all RISC CPUs requiring strict alignment
> on memory accesses.  I would bet on a misaligned memory access somewhere
> in the code, but not an actual issued misaligned access (as this will cause

That was the idea of the ARM people too and we already tried that out one
week ago. From the IRC log:

09:35 < suihkulokki> _rene_: do you have any idea why graphite2 ftbfs's on arm
09:35 < suihkulokki> _rene_: I take it is due to unaligned access since it's also failing on sparc?
[...]
10:07 < _rene_> suihkulokki: was never reaally debugged...
10:07 < _rene_> suihkulokki: can be, but why does armhf then build?
[...]
10:17 < suihkulokki> _rene_: armv7+ can do unaligned memory access
10:17 < _rene_> ah, hmm
10:18 < suihkulokki> this issue has become more interesting now that texlive-bin is blocked by lack of libgraphite2-dev
10:18 < _rene_> lol
10:18 < _rene_> ok
10:19 < _rene_> good that he enabled it knowing it's not there on all archs
10:19 < _rene_> if you tell me what to check I can do :)
10:19 < _rene_> s/it/it on all archs/
10:20 -!- davi [davi@wilbur.25thandclement.com] has joined #debian-arm
10:20 < _rene_> (or, if you want, NMU it with my permission)
10:22 < suihkulokki> _rene_: if you have an armv5 machine, you can test setting /proc/cpu/alignment to 3 and see if the testsuite passes
10:23 < suihkulokki> if you don't have one, I (or someone else here) will look at it later
10:23 < _rene_> suihkulokki: sheevaplug
10:23 -!- mones_ is now known as mones
10:23 < suihkulokki> sheeva is armv5, that should do
[...]
10:41 < _rene_> suihkulokki: with 3 I also get the testuite failing
10:53 < _rene_> fails on all three but with a bit of differences
10:53 < _rene_> suihkulokki: zyklop.dyndns.org:~/rene/graphite2_1.2.1-1_armel.build.default
10:53 < _rene_> suihkulokki: zyklop.dyndns.org:~/rene/graphite2_1.2.1-1_armel.build.3
10:53 < _rene_> suihkulokki: zyklop.dyndns.org:~/rene/graphite2_1.2.1-1_armel.build.5

Regards,

Rene