I have an explanation and a workaround, but not a real fix. The
problem, as config.log says, is three unresolved symbols in libSDL:
- Color565DitherYV12MMX1X
- ColorRGBDitherYV12MMX1X
- outb
I grepped around a bit and discovered that ‘outb’ is only used in the
framebuffer code and since I don’t care about a framebuffer video mode,
I was able to ‘fix’ it by --disable-video-fbcon. Okay, not a solution,
but it works for me.
The other two symbols, not surprisingly, are defined in
./src/video/SDL_yuv_mmx.c, quite clearly, and referenced in
./src/video/SDL_yuv_sw.c. I tried fiddling with the Makefile and
building things by hand, but that only resulted in segfaults with the
tests, then I noticed something that should have been plainly obvious to
me from the start. All of SDL_yuv_mmx.c is wrapped in the following:
#if defined(i386) && defined(GNUC) && defined(USE_ASMBLIT)
.
.
.
#endif
But the only spots where the offending two symbols are referenced are
protected by:
#if defined(i386) && defined(GNUC)
.
.
.
#endif
Which got me looking a lot closer at SDL_yuv_sw.c. At first I thought
the problem was that USE_ASMBLIT was undefined in my environment and
that the ‘&& defined(USE_ASMBLIT)’ should be added to the other #ifs,
but that still didn’t fix everything. That’s when I noticed that the
’extern’ references around them didn’t even have the benefit of the
short ‘if’. So, I added the extended if around them as well and now all
seems not too bad. I don’t say all seems well because the latest smpeg
(anything after 0.3.5, acutally) from loki segfaults when I try to load
anything in it, audio or video, but since other SDL-based tools (only
tried mtv and SDLroids so far) seem to work fine, I’m now going to
assume it is smpeg that doesn’t want to play nicely.
So, am I actually the only one with a configuration that will cause this
to happen or should there be an update to SDL_yuv_sw.c? Or have I
managed to break something else and I’ve just been lucky that SDLroids
hasn’t trashed my system yet?
-Joe.
In message: Re: [SDL] undefined reference in libSDL.so on 16/01/2001
(Tue 10:50) Joe MacDonald wrote:>
Oops, sorry about that. The system is a modified Slackware 7.1. Clean
install, migrated to 2.4.0-ac4 from a 2.2 series kernel plus all the
required package updates (binutils, util-linux, modutils and ppp). I’m
using gcc-2.95.2, compiled from source, and Gnu Make 3.78.
The only other non-stock Slackware item is XFree, I’ve upgraded to
4.0.1e (I think that was the last one I checked out of CVS, from the
trunk about a week and a half ago now) from the DRI project’s CVS tree.
I have the glide3x libraries and headers (definitely not the latest
versions there, though) for an AGP Voodoo3 2000 card. DRI seems to be
running just fine with Q3A and CivCTP doesn’t crash any more often than
it used to. UT is giving me grief, but I gather that’s my own fault for
moving to XFree 4.0, so I guess I’ll live with it.
The hardware is an AMD-K6-2 450 with 168MB of RAM on a ~2gig parition
that is almost entirely empty. In case it’s relevant my sound card is
an authentic Creative Labs AWE 64 and it plays nicely with the OSS
drivers and esd.
As for the configure line, that’s a bit more difficult. I’m not
actually at my machine right now, but if I recall correctly I started
using ./configure --prefix=/usr/local/encap/SDL-1.1.7 and failing that I
just did a ./configure. I didn’t see anything to turn off MMX code, but
maybe that’s what I need to do.
Is there anything else you need to know? I can’t think of what else
might be relevant.
Thanks,
-Joe.
In message: Re: [SDL] undefined reference in libSDL.so ()
on 15/01/2001 (Mon 23:21) Sam Lantinga wrote:
Hey all,
I’ve been trying to install libsdl for months now, all the way back to
1.1.3 and without fail I always get exactly the same problem in my
./configure step of the libsdl test:
configure:2285: gcc -o conftest -I/usr/local/gnome/include -L/usr/local/gnome/lib -I/usr/local/include -L/usr/local/lib -I/usr/X11R6/include -I/usr/local/include -I/usr/local/include/SDL -D_REENTRANT -I/usr/local/gnome/include -L/usr/local/gnome/lib -I/usr/local/include -L/usr/local/lib conftest.c -L/usr/local/lib -Wl,-rpath,/usr/local/lib -lSDL -lpthread 1>&5
/usr/local/lib/libSDL.so: undefined reference to Color565DitherYV12MMX1X' /usr/local/lib/libSDL.so: undefined reference toColorRGBDitherYV12MMX1X’
/usr/local/lib/libSDL.so: undefined reference to `outb’
Can you tell us more about your system and compiler version?
What options are you using when building SDL?
Thanks,
-Sam Lantinga, Lead Programmer, Loki Entertainment Software
–
-Joe MacDonald.
X windows:
You’ll wish we were kidding.