GNU bug report logs - #13479
Cross Compiling for ARM

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ross Biro <ross.biro <at> mindspring.com>
Subject: bug#13479: closed (Re: bug#13479: Cross Compiling for ARM)
Date: Wed, 10 Jan 2024 11:57:02 +0000

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Your bug report

#13479: Cross Compiling for ARM

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 13479 <at> debbugs.gnu.org.

-- 
13479: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=13479
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Stefan Kangas <stefankangas <at> gmail.com>
To: Po Lu <luangruo <at> yahoo.com>
Cc: Toon Claes <toon <at> iotcl.net>, 13479-done <at> debbugs.gnu.org,
 9192-done <at> debbugs.gnu.org
Subject: Re: bug#13479: Cross Compiling for ARM
Date: Wed, 10 Jan 2024 03:56:41 -0800

Po Lu <luangruo <at> yahoo.com> writes:

> Stefan Kangas <stefankangas <at> gmail.com> writes:
>
>> Toon Claes <toon <at> iotcl.net> writes:
>>
>>> I was trying to cross-compile emacs for ARM (don't ask me why).
>>> But got an error during 'make' (see output below FIRST RUN).
>>>
>>> So it's for sure 'test-distrub' was build for ARM, while it is trying to run on i686.
>>>
>>> On the second run (just, ran 'make again), I got a similar error on 'prefix-args'.
>>> But for some reason the 'test-distrub' error is gone (probably because 'make' thinks it is already finished.
>>>
>>> So I have to compile them with the host compiler (i686).
>>> But I'm not sure how to implement this properly.
>>>
>>>
>>> Also I would like to get rid of the warning: "LIB_GCC" redefined
>>
>> That was 12 years ago.  I'm therefore reaching out to ask if this bug is
>> still relevant, or if it has since been fixed?
>>
>> If I don't hear back from you within a couple of months, Ill just assume
>> that this has been fixed and close this bug.
>
> The Android port is routinely cross-compiled for ARM systems, so despite
> its using a different build procedure from the rest of our builds, no
> code except dumping should remain that prevents cross-compiling Emacs.
>
> The OP's requirements have also been satisified by the Android port,
> which is supposed to support Chromebooks.

Thanks, I'm therefore closing this bug report.

If this conclusion is incorrect and this is still an issue, please reply
to this email (use "Reply to all" in your email client) and we can
reopen the bug report.

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From: Ross Biro <ross.biro <at> mindspring.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Cross Compiling for ARM
Date: Thu, 17 Jan 2013 14:36:08 -0500

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I just more or less successfully compiled emacs-24.2 for a Samsung
Chromebook.  I did it by using the chrooted build environment for
chromiumos.  In the process I learned a couple of things.

I used the configuration:

../emacs-24.2/configure  --build=x86_64-pc-linux-gnu
--host=arm-none-linux-gnueabi --target=arm-none-linux-gnueabi
--with-x-toolkit=no --with-xpm=no --with-jpeg=no --with-png=no
--with-gif=no --with-tiff=no  --without-xml2 --without-gnutls --without-x
--without-dbus --with-crt-dir=/build/arm-generic/usr/lib/

Obviously, I also had to CANNOT_DUMP=yes as well.

1) It doesn't look like emacs has a concept of a BUILDCC.  I like to set CC
to the cross compiler since that seems to be what most things need.
However make-docfile and test-distrib need to be built with the local
compiler.  Usually the path to the local compiler is stored in BUILDCC.  I
just changed the $(CC) to $(BUILDCC) in the makefile for those two file and
everything compiled ok.

2) The lisp and leim directories really want a local copy of emacs to
compile.  Since I didn't have one available in the chrooted environment, I
just used /bin/true.  Suboptimal, but it let the compile complete.  I
didn't see an obvious way to set the path to an external emacs, I just
edited the makefile.

3) Now, a real bug.  With an undumpped emacs,
window__resize_root_window_vertically is called before it's defined.  Even
putting if (initialzed) before the call didn't help.  I had to put  if (!EQ
(XSYMBOL (Qwindow_resize_root_window_vertically)->function, Qunbound))
before the two calls to  call2 (Qwindow_resize_root_window_vertically,  in
window.c.

Now, I'm going to try to and some more libraries and do some additional
testing.  If anyone has questions, email me directly.

    Ross

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