On Mon, 21 Oct 2019 at 14:32, Eli Zaretskii <eliz@gnu.org> wrote:
> From: Richard Copley <rcopley@gmail.com>
> Date: Mon, 21 Oct 2019 14:17:36 +0100
> Cc: 37852@debbugs.gnu.org
>
> On Mon, 21 Oct 2019 at 14:07, Eli Zaretskii <eliz@gnu.org> wrote:
>
>  > From: Richard Copley <rcopley@gmail.com>
>  > Date: Mon, 21 Oct 2019 13:28:29 +0100
>  >
>  > Linking auxiliary executables fails with undefined references to (FORTIFY_SOURCE?) functions
>  > __memcpy_chk and __memmove_chk. This is apparently caused by some change in MSYS2,
>  because
>  > previously buildable commits now fail. Transcript below.
>
>  Looks like FORTIFY_SOURCE requires linking against -lssp?  Can you try
>  adding that, e.g. by
>
>    make LIBS_SYSTEM=-lssp
>
> Yes, that works.

OK, thanks.

So do we need to add that library to the link command under some
conditions?  IOW, is FORTIFY_SOURCE something that comes out of our
configure script (in which case I'm missing something, because I
didn't find it in the configure script),

I don't know.
 
or is this an option you
added manually?

No, I built in a clean checkout of master, with these commands:

./autogen.sh
./configure --without-pop --without-dbus --without-gconf --without-gsettings "CFLAGS=-O2"
make