Re: mxe-octave cross-build errors when building native-gcc

[Philip Nienhuis]

John D wrote:
> -----Original Message-----
> From: John D [mailto:address@hidden
> Sent: Sunday, March 02, 2014 8:08 PM
> To: address@hidden; Philip Nienhuis
> Cc: John W. Eaton
> Subject: mxe-octave cross-build errors when building native-gcc
>
> Message: 3
> Date: Sun, 2 Mar 2014 14:41:30 -0800 (PST)
> From: PhilipNienhuis <address@hidden>
> To: address@hidden
> Subject: mxe-octave cross-build errors when building native-gcc
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=UTF-8
>
> With mxe-octave
>
> (hg summary:
> parent: 3556:22b42ac3fd68 tip
>   native-gcc: remove unintended changes to native-gcc.mk from cs
> b1ca68ddd02c)
>
> the cross-build consistently stops at native-gcc with (from the log):
>
> :
> g++ -c   -g -O2 -DIN_GCC   -fno-exceptions -fno-rtti
<snip>
> ----
> I get the same trying to cross compile on my Fedora 20 machine, what OS are
> you using?
> Attached patch makes it compile for me.
> I looks to me that it is trying to pull in some system includes instead of
> the mxe build ones, but I couldn't get it to not do that except by compiling
> with mpc, mprf etc copied into the gcc build as per the patch.
>
> ---
> With actual content in the patch (attached)

Just found some time to try that patch. Result:
native-gcc gets (cross-)built fine now,
using mxe-octave's tip of March 6 (today) - b1a7cff2d2a9 / Add octave 
forge of-netcdf package (and support files).

Thanks!

>
> The other thing needed (on my system as least) has been to copy 
libgcc.a to
> the lib folder when making the dist (Not included in this patch) in order
> for gcc to compile programs when installed.

Could this be the reason for not being able to install packages as 
reported e.g., here:
http://octave.1599824.n4.nabble.com/cannot-install-packages-on-octave-3-8-1rc3-tt4662113.html
?
I did find a libgcc.a in ./lib/gcc/i686-w64-mingw32/4.8.2

==> Here I needed to copy libgcc_s.a from 
.\lib\gcc\i686-w64-mingw32\lib\ (rather than libgcc.a 
from.\lib\gcc\o686-w64-mingw32\4.8.2\) to ./lib to avoid "cannot find 
-lgcc_s" errors from ld.
What needs to be patched for that? he nsis installer script?


On a related note, it is better to comment out the OF tsa package line 
in src/build_packages.m as long as Alois hasn't fixed the compile flags 
(see bug #41635).


BTW I also found out that Octave with OpenBLAS doesn't seem to work well 
on some Core i3 CPUs. Last Wednesday I installed Octave-3.8.1-rc4 on a 
colleague's WinXP laptop with that CPU, and Octave-gui's opening window 
(the cmd32.exe that disappears later during startup) showed repeated 
messages along the lines of (IIRC):
"OpenBLAS: ..... AVX instruction missing"
(followed by a very long delay)
Anyway I see that in the latest mxe-octave there's a choice for ref- or 
openblas. Nice!

Philip