bug#28308: Build failure on FreeBSD/aarch64

[Gergely Czuczy]

On 2017. 09. 11. 19:17, Eli Zaretskii wrote:
> > Cc: npostavs@users.sourceforge.net, 28308@debbugs.gnu.org
> > From: Gergely Czuczy <gergely.czuczy@harmless.hu>
> > Date: Mon, 11 Sep 2017 19:12:12 +0200
> >
> > > That's a call to delete_terminal, which doesn't appear in your
> > > backtrace, and doesn't call xpalloc, either.  So thanks, but I'm still
> > > confused.  Are you sure this is an unoptimized build?  Is it possible
> > > that we are looking at LLDB bug?
> > It's the lldb debug, right. And I'm sure it's an unoptimized build, I've
> > went back and checked the build flags:
> > cc -Demacs  -I. -I. -I../lib -I../lib
> > -I/usr/local/include/libxml2             -MMD -MF deps/.d -MP
> > -Wno-switch -Wno-pointer-sign -Wno-string-plus-int
> > -Wno-unknown-attributes -Wno-initializer-overrides
> > -Wno-tautological-compare
> > -Wno-tautological-constant-out-of-range-compare -O0 -g
> > -fno-strict-aliasing  -Wl,-znocombreloc  (...)
> >
> > If that helps, I can create a qemu VM with this fbsd build, and give you
> > the image.
> Would it be possible for you to install GDB, and then repeat the same
> experiment under GDB?
So, here's the image for the reproduction:
http://czg.harmless.hu/emacs/qemu-28308.gz
You can start it with:
qemu-system-aarch64 -m 4096M -cpu cortex-a57 -M virt  \
                    -accel tcg,thread=single \
                    -bios QEMU_EFI.fd -serial telnet::4444,server 
-nographic \
                    -drive if=none,file=${image},id=hd0,format=raw \
                    -device virtio-blk-device,drive=hd0 \
                    -device e1000,netdev=net0 \
                    -netdev 
tap,id=net0,ifname=tap0,script=/tank/rpi3/build/qemu-ifup.sh

adjust the $image, and the last line for the networking, it just sets 
the IP address on the host device:
ifname=$1
ifconfig ${ifname} inet 10.219.14.254/24

The root password is "foobar", has an sshd running, so you can later log 
in, tramp into it,etc.

Steps to reproduce the build failure:
cd /usr/ports/editors/emacs-devel
setenv CFLAGS "-O0 -glldb"
setenv CXXFLAGS "-O0 -glldb"
make -DTRYBROKEN DISABLE_VULNERABILITIES=yes build

The ports tree extracts the source under and does the actual build under 
work/, you will find it all there.

Also, just in case, I've checked out the emacs source from github under 
/root/emacs/, to save you some time if that's needed.

If you would like to test the build from a different checkout in ports, 
just update /usr/ports/editors/emacs-devel/Makefile:
1) update the GH_TAGNAME
2) rm distinfo
3) make makesum
4) rm -rf work
5) then you can start the build again

I hope this helps.

Best regards,
Gergely