[OpenWrt-Devel] some questions/observations about building qemu/malta image

[Robert P. J. Day]

  a few questions about things i ran into today trying to build a qemu
malta image using the latest git checkout of openwrt -- some are
admittedly trivial, i just want to make sure i'm understanding
everything related to them. i started with the config.malta_le config
file downloaded from openwrt.org.

  first, i'm aware that trying to run the pre-built qemu image from
downloads.openwrt.org will fail with a kernel panic, as explained
here:

  http://wiki.openwrt.org/doc/howto/qemu#openwrt.in.qemu.mips

so during configuration, i deselected MIPS16 support. i'm not really
familiar with the MIPS architecture but, as i read it, that support is
really just an optimization so i can do away with it, yes?

  next, haven't done this yet but to save piles of time, i'm going to
deselect all config settings of the form:

  CONFIG_PACKAGE_...=m

as i understand it, those selections represent packages that will be
compiled and packaged, but not built into the final rootfs. and, just
to be clear, while such a final image might be deficient in all sorts
of features, it should still *theoretically* boot, which is all i care
about right now.

  next issue i ran into was this (which looks like a real bug):

make[4]: Entering directory
'/home/rpjday/openwrt/qemu_malta/build_dir/target-mipsel_mips32_uClibc-0.9.33.2/dump1090-2014-08-22'
mipsel-openwrt-linux-uclibc-gcc -Os -pipe -mno-branch-likely -mips32
-mtune=mips32 -fno-caller-saves -fhonour-copts
-Wno-error=unused-but-set-variable -msoft-float -mips16
-minterlink-mips16  -c dump1090.c
In file included from dump1090.c:31:0:
dump1090.h:60:25: fatal error: rtl-sdr.h: No such file or directory
     #include "rtl-sdr.h"
                         ^
compilation terminated.
Makefile:21: recipe for target 'dump1090.o' failed
make[4]: *** [dump1090.o] Error 1

  not sure what to make of that ... i checked under the build dir and
there is such a header file at this location:

$ find build_dir/ -name rtl-sdr.h
build_dir/target-mipsel_mips32_uClibc-0.9.33.2/dump1090-2014-08-22/rtlsdr/rtl-sdr.h
$

is this a known issue? for now, i'll get around it by just
deselecting the dump1090 package but that shouldn't be necessary.
should i file a bug report on this?

  another issue was one i ran into before and that i reported here:

https://github.com/openwrt/packages/issues/296

a bit later this evening, i'll try applying the patch mentioned there.
does anyone have any further info on this bug?

 finally (and this one is a bit weird), i was trying all of the above
at a site where the corp firewall did not allow numerous fetching
protocols, including git, ftp and wget, but i had most of the tarballs
i needed already so i figured i was in good shape.  not so, it turns
out.

  partway through the build, building gcc just hung, and i tracked it
down to this:

$ vi build_dir/mipsel_mips32_uClibc-0.9.33.2/gcc-4.8.3/contrib/download_prerequisites

MPFR=mpfr-2.4.2
GMP=gmp-4.3.2
MPC=mpc-0.8.1

wget ftp://gcc.gnu.org/pub/gcc/infrastructure/$MPFR.tar.bz2 || exit 1
tar xjf $MPFR.tar.bz2 || exit 1
ln -sf $MPFR mpfr || exit 1
... snip ...

  argh. so, as i read it, there is no way to preload tarballs to get
around the above, is there? configuring gcc above *requires* net
access, is that correct?

  anyway, feel free to comment on any of the above. thanks.

rday

-- 

========================================================================
Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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