Re: Initial cross-compilation support

[Ludovic Courtès]

Nikita Karetnikov <address@hidden> skribis:

>> Can you run ‘file’ on libgcc.a (or one of the .o files it contains)?
>> Can you check in the glibc log whether a -mabi flag is passed?
>
> Oh, I forgot to add the -K option.  There are no logs.

-K has nothing to do with logs.  :-)

Logs are always kept, under /nix/var/log/nix/drvs by default (the
directory and file name correspond to the .drv name.)

>> You may need to explicitly add -mabi=64 for glibc.  It should be
>> possible to do it with something like:
>
>>   #:configure-flags '("CFLAGS=-mabi=64 -g -O2")
>
> Which 'glibc' should be used?

The cross one.

> I tried to use
>
>        ((#:configure-flags flags)
>         `(cons ,(string-append "CFLAGS=-mabi=64 -g -O2 " "--host=" target)
>                ,flags))
>
> in 'cross-libc' ('cross-base.scm'), but it failed:
>
> checking for suffix of object files... configure: error: in 
> `/tmp/nix-build-glibc-cross-mips64el-linux-gnu-2.17.drv-3/build':
> configure: error: cannot compute suffix of object files: cannot compile

Can you check what config.log has to say?

> I reread the quasiquote-related part of the manual, but I still fail to
> understand how to add 'CFLAGS' properly.

You did it right.  :-)

Ludo’.