On 2/20/2010 10:20 AM, Dan Nicholson wrote:
On Sat, Feb 20, 2010 at 8:37 AM, Paul Bender<pebender@xxxxxxxxxx> wrote:
On 2/20/2010 1:52 AM, huyle wrote:
Hi,
I am currently building an linux system for arm board. I am stuck with
udev. So can you help me with some commands to compile udev with cross
compilation?
Thanks for your time
I am cross compiling udev, but not for the ARM.
The only trouble that I have encountered when cross compiling version 151 is
with the configure scripts determination of the pci.ids file location. This
is caused by autoconf's AC_CHECK_FILES macro generating an error when cross
compiling. However, this can be worked around by setting
ac_cv_file__usr_share_pci_ids='no'
ac_cv_file__usr_share_hwdata_pci_ids='no'
ac_cv_file__usr_share_misc_pci_ids='no'
in the build system's environment before running configure and setting the
configure script's --with-pci-ids-path argument.
I have had this work around for so long that I have not given it much
thought. However, it is relatively easy to fix the configure script so that
it only attempting to determine the pci.ids file location when
--with-pci-ids-path is not set. Therefore, I have created and attached a
patch that should do this. Of course, after applying, you would need to
rerun autoconf or autoreconf.
I think it would be better to just make the AC_CHECK_FILES conditional
on cross compiling:
if test $cross_compiling != yes; then
AC_CHECK_FILES...pci.ids not found, try --with-pci-ids-path
else
# just assume pciids location
pciids=/usr/share/pci.ids
fi
Otherwise, people cross compiling will bomb unless they pass
--with-pci-ids-path.
Unless I misunderstand AC_ARG_WITH, its third argument is for what to do
when the corresponding --with configure argument is not provided, which
is how it behaves in my build system (with autoconf 2.63). That is why I
put the AC_CHECK_FILES in the third argument.
I like your patch better than mine as it does not generate the unhelpful
error message:
"cannot check for file existence when cross compiling".
when the --with-pci-ids-path is not provided.
However, for cross compiling, it might be better to force the user to
provide --with-pci-ids-path rather than assuming one since an incorrect
assumed path would not be discovered until on target runtime.
Likewise, you changed the 'test -n "$pciids"' to
a 'test -x'. I don't know a lot of people with an executable pci
database. Attached is a patch to do this.
Doh, that was supposed to be -z. Thanks for the catch.
--
To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
