On Thu, May 19, 2011 at 02:32:39PM +0200, Reto Schneider wrote:
> Hi
>
> I have a fresh installation of openBSD 4.9-release where the sample code of
> the graphviz library
> fails. It also fails on openBSD 4.8 but works perfectly on
> 4.7/Ubuntu/Debian/FreeBSD/etc.
>
> How to get the error:
>
> Install graphviz:
>
> # export PKG_PATH="http://mirror.switch.ch/ftp/pub/OpenBSD/4.9/packages/i386/";
> # pkg_add -r graphviz
>
>
> Creating the file sample.c with this content
> (http://www.graphviz.org/pdf/libguide.pdf, found at
> page 40):
>
> #include <gvc.h>
> int main(int argc, char **argv)
> {
> GVC_t *gvc;
> graph_t *g;
> FILE *fp;
> gvc = gvContext();
> if (argc > 1)
> fp = fopen(argv[1], "r");
> else
> fp = stdin;
> g = agread(fp);
> gvLayout(gvc, g, "dot");
> gvRender(gvc, g, "plain", stdout);
> gvFreeLayout(gvc, g);
> agclose(g);
> return (gvFreeContext(gvc));
> }
>
>
> Compile it (like shown in the example Makefile on page 39):
> $ gcc -o sample sample.c `pkg-config --libs --cflags libgvc`
You need to link it with the pthreads library by passing -lpthread.
>
>
> Run it:
> $ ulimit -c unlimited
> $ echo "graph G{node1;}"|./sample
> ./sample:/usr/local/lib/libgthread-2.0.so.2600.0: undefined symbol
> 'pthread_getschedparam'
> lazy binding failed!
> Segmentation fault (core dumped)
>
>
> Backtrace:
> $ gdb sample sample.core
>
> (gdb) bt
> #0 0x01deb370 in _dl_bind () from /usr/libexec/ld.so
> #1 0x01de7b87 in _dl_bind_start () from /usr/libexec/ld.so
> #2 0x7c9a7628 in ?? ()
> #3 0x00000050 in ?? ()
> #4 0xcfbe0033 in ?? ()
> #5 0x01de0033 in ?? ()
> #6 0x00000000 in ?? ()
>
> The workaround I use for now is to link the program sample directly against
> pthread:
> $ gcc -o sample sample.c `pkg-config --libs --cflags libgvc` -pthread
>
> I have found a commit to the ports which does exactly this for the dot tool
> (without this patch it
> fails like the code above):
> http://www.openbsd.org/cgi-bin/cvsweb/ports/math/graphviz/patches/patch-cmd_dot_Makefile_in?rev=1.1;content-type=text%2Fx-cvsweb-markup
>
> Now I am wondering it I did something wrong or if there is a problem with
> openBSD 4.8 and 4.9.
>
> Regards,
> Reto
