Re: Initial cross-compilation support

[ludo@gnu.org (Ludovic Courtès)]

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Hello!

(Please leave a bit more context when quoting messages, to make it
easier for me to follow.  ;-))

Nikita Karetnikov <nikita@karetnikov.org> skribis:

>>> Oh, I forgot to add the -K option.  There are no logs.
>
>> -K has nothing to do with logs.  :-)
>
> I meant the build tree.
>
> I can't find 'libgcc.a':

The absolute file name appeared in your previous message:

  /nix/store/g9js73bwv1fl92h1nnf50vf1619irnxf-gcc-cross-sans-libc-mips64el-linux-gnu-4.7.2/lib/gcc/mips64el-linux-gnu/4.7.2/libgcc.a

>> You did it right.  :-)
>
> I don't think so.

We were referring to quasiquote/unquote, and yes, you did it right.

> config.log:
>
> configure:2785: gcc -c -mabi=64 -g -O2 --host=mips64el-linux-gnu  conftest.c >&5
> gcc: error: unrecognized argument in option '-mabi=64'
> gcc: note: valid arguments to '-mabi=' are: ms sysv
> gcc: error: unrecognized command line option '--host=mips64el-linux-gnu'

Ah, yes, that’s because CFLAGS is also used by the /native/ compiler,
hence this failure.

After a bit of research, I found ports/sysdeps/mips/preconfigure (in
libc).  Apparently, it interprets the OS part of the target triplet to
determine the ABI.  So, if you specify --target=mips64el-linux-gnuabi64,
it should automatically build glibc for n64.

The simplest way to do that is probably:


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diff --git a/gnu/packages/cross-base.scm b/gnu/packages/cross-base.scm
index 69dc9f5..f4903d3 100644
--- a/gnu/packages/cross-base.scm
+++ b/gnu/packages/cross-base.scm
@@ -231,7 +231,7 @@ XBINUTILS and the cross tool chain."
 ;;;
 
 (define-public xgcc-mips64el
-  (let ((triplet "mips64el-linux-gnu"))
+  (let ((triplet "mips64el-linux-gnuabi64"))
     (cross-gcc triplet
                (cross-binutils triplet)
                (cross-libc triplet))))

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(And you can remove previous attempts to specify CFLAGS.)

Can you try that?

TIA!

Ludo’.