I have a follow-up to this. What was happening is that in the check for `gethostname`, it tries to compile without linking against ws2_32. Note that unistd.h includes winsock2.h on my platform. Now, normally this check will fail (at linking), BUT since a check has been made before for linking to X11 (which links to ws2_32), ws2_32 is being implicitly linked:
> x86_64-w64-mingw32-gcc -std=gnu99 -std=gnu99 -o conftest.exe -DWIN32
> -I/home/tanjj/ffbuild/target/mingw64//include -I/mingw64/include
> -I/usr/local/include -I/include -g -DWIN32
> -I/home/tanjj/ffbuild/target/mingw64//include -I/mingw64/include
> -I/usr/local/include -I/include -g -I${top_builddir} -I${top_srcdir}
> -L/home/tanjj/ffbuild/target/mingw64//lib -L/mingw64/lib -L/usr/local/lib
> -L/lib -lws2_32 conftest.c -lX11 -lltdl -lws2_32 >&5
Which means that this check succeeds when it should not.
I have attached a patch to gethostname.m4 which reorders the check - if Winsock
is found, try to compile by linking to it first. If that fails, then try the
normal way. The patch works for me, but I know practically nothing about m4, so
I have no idea if I'm doing the right thing or not.
Thanks,
Jeremy
From: jt...@outlook.com
To: bug-gnulib@gnu.org
Subject: Trouble with gethostname and mingw-w64 x86_64
Date: Wed, 12 Nov 2014 19:53:40 +0800
I've been having some difficulty building FontForge on Windows (8.1 64bit)
using msys2 and mingw-w64 (64-bit target). Up until a few months ago,
everything was building fine, but now I'm facing an issue which I believe has
to do with Gnulib. I can't say that I understand much of how gnulib acutually
works, so forgive me if this is a basic error.
I'll start off by saying that building with a 32-bit target works fine.
FontForge has `gethostname` as a requirement, so the `gethostname` module is
set from Gnulib. When building on 32-bit and when running the configure script,
the detection for `gethostname` fails (not present) and so I believe gnulib
does its own implementation and everything works.
However, when building for 64-bit, the `gethostname` detection succeeds (it is
available
http://msdn.microsoft.com/en-us/library/windows/desktop/ms738527%28v=vs.85%29.aspx
but not on XP).
I believe this is where things go wrong. When building, Gnulib replaces
instances of `gethostname` with `rpl_gethostname`, but `rpl_gethostname` is
never compiled into the support library. For that matter, even though I can see
`gethostname.c` under `lib/`, it is completely ignored when compiling. Thus
when it comes to the linking stage, it falls over, with:
.libs/libgutils_la-gnetwork.o: In function `ff_gethostname':
C:\msys64\home\box\ffbuild\work\mingw64\fontforge\gutils/gnetwork.c:57:
undefined reference to `rpl_gethostname'
I have attached two files - one is the build log for 32-bit (which succeeds in
building) and another for 64-bit (which fails to build).
So, with that said does anyone know where to go from here? Any help in
resolving this issue would be greatly appreciated.
Thanks,
Jeremy
0001-Reorder-the-check-for-gethostname-if-Winsock-is-pres.patch
Description: Binary data
