Did you find a way to get this to work? On Saturday, October 24, 2015 at 9:09:51 PM UTC-4, Hiroaki Nakamura wrote: > > Hi. > > I tried to create an Varnish VMOD equivalent to > https://github.com/varnish/libvmod-example/tree/4.1 in go, > but I got "undefined reference" link errors. > > ``` > gcc -I . -fPIC -m64 -pthread -fmessage-length=0 -o > $WORK/command-line-arguments/_obj/_cgo_.o > $WORK/command-line-arguments/_obj/_cgo_main.o > $WORK/command-line-arguments/_obj/_cgo_export.o > $WORK/command-line-arguments/_obj/libvmod_example.cgo2.o > $WORK/command-line-arguments/_obj/vcc_if.cgo2.o -g -O2 -lvarnishapi > # command-line-arguments > /tmp/go-build219936183/command-line-arguments/_obj/libvmod_example.cgo2.o: > In function `_cgo_d098f44947dd_Cfunc_WS_Reserve': > ./libvmod_example.go:64: undefined reference to `WS_Reserve' > /tmp/go-build219936183/command-line-arguments/_obj/libvmod_example.cgo2.o: > In function `_cgo_d098f44947dd_Cfunc_WS_Release': > ./libvmod_example.go:50: undefined reference to `WS_Release' > /usr/lib/gcc/x86_64-redhat-linux/4.8.3/../../../../lib64/libvarnishapi.so: > undefined reference to `pow' > /usr/lib/gcc/x86_64-redhat-linux/4.8.3/../../../../lib64/libvarnishapi.so: > undefined reference to `round' > collect2: error: ld returned 1 exit status > make: *** [libvmod_example.so] Error 2 > ``` > > My Dockerfiles for building this VMOD are at > > https://github.com/hnakamur/docker-varnish-vmods-development/tree/try_to_create_vmod_in_go > > I confirmed two functions WS_Reserve and WS_Release are not linked in > libvarnishapi.so > (which is specified with -lvarnishapi above). > I confirmed it with the following command which printed one line but > cache_ws.c is just mentioned in a comment. > > ``` > $ docker exec -it dockervarnishvmodsdevelopment_varnish_1 bash -l -c "cd > /root/rpmbuild/SOURCES/Varnish-Cache-varnish-4.1.0/lib && grep -R cache_ws > ." > ./libvmod_std/vmod_std_querysort.c: /* We trust cache_ws.c to align > sensibly */ > ``` > > Actually they are linked in varnishd executable. > > https://github.com/varnish/Varnish-Cache/blob/varnish-4.1.0/bin/varnishd/Makefile.am#L52 > > Is there a way to work around these undefined references and build a VMOD > shared library successfully? > > Thanks, > Hiroaki >
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