Re: how to do findutils cross-compilation for ARM platform?

[Eric Blake]

[adding bug-gnulib]

On 12/25/2011 09:43 PM, chunrong lai wrote:
> I tried to build a ARM version of findutils in my ubuntu 10.10 (x86_64)
> with below commands
>       CC=arm-linux-gnueabi-gcc CFLAGS="-g" ./configure --build
> arm-cross-linux-gnueabi --host i686-pc-linux-gnu

In general, you should get in the habit of passing CC=... and CFLAGS= as
arguments to configure, rather than via the environment, so that
configure can properly record things so that a later run of
./config.status with a different set of environment variables will still
remember your configure choices.

>       make
> 
> I met errors as
>         arm-linux-gnueabi-gcc -std=gnu99 -DHAVE_CONFIG_H -I. -I../..
>  -I../../intl   -g -MT areadlink-with-size.o -MD -MP -MF $depbase.Tpo -c -o
> areadlink-with-size.o areadlink-with-size.c &&\
>         mv -f $depbase.Tpo $depbase.Po
>         In file included from ./stdio.h:31,
>               from areadlink-with-size.c:25:
>         /usr/arm-linux-gnueabi/include/stdio.h:742: error: expected
> declaration specifiers or ‘...’ before ‘(’ token
>         /usr/arm-linux-gnueabi/include/stdio.h:742: error: conflicting
> types for ‘rpl_fseeko’
>        ./stdio.h:275: note: previous declaration of ‘rpl_fseeko’ was
> here
> but do not quite understand what happened. Any helps are appreciated.

This sounds like a gnulib problem.  Gnulib thinks that your ARM fseeko()
is deficient (perhaps because it is a pessimistic cross-compilation
guess, rather than an actual bug), but its attempts to replace things
via rpl_fseeko are triggering some sort of circular header inclusion
cycle where the gnulib replacement gets defined prior to the system
declaration.  A proper fix will probably require knowledge of which
header files are involved in the circular inclusion, and/or updating the
cross-compilation logic to guess correctly for your platform in the
first place.

Meanwhile, a quick workaround would be to prime the cache to avoid the
replacement in the first place (assuming that gnueabi's fseeko() is not
deficient, after all); try:

./configure CC=arm-linux-gnueabi-gcc CFLAGS="-g" \
  --build arm-cross-linux-gnueabi --host i686-pc-linux-gnu \
  gl_cv_func_fflush_stdin=yes

to see if that is enough to bypass the pessimistic cross-compilation
guess (or post more of config.log so that we know the full set of
cross-compilation guesses in effect).

-- 
Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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