Samples need to be compiled with -pthread now.

c++/samples/test.sh

@@ -6,7 +6,7 @@
 set -exuo pipefail
 
 capnpc -oc++ addressbook.capnp
-c++ -std=c++11 -Wall addressbook.c++ addressbook.capnp.c++ -lcapnp -o addressbook
+c++ -std=c++11 -Wall addressbook.c++ addressbook.capnp.c++ -lcapnp -pthread -o addressbook
 ./addressbook write | ./addressbook read
 ./addressbook dwrite | ./addressbook dread
 rm addressbook addressbook.capnp.c++ addressbook.capnp.h

super-test.sh

@@ -158,7 +158,7 @@ doit make install
 cd samples
 doit capnpc -oc++ addressbook.capnp -I"$STAGING"/include
 doit ${CXX:-g++} -std=c++11 $SAMPLE_CXXFLAGS -I"$STAGING"/include -L"$STAGING"/lib \
-    addressbook.c++ addressbook.capnp.c++ -lcapnp -o addressbook
+    addressbook.c++ addressbook.capnp.c++ -lcapnp -pthread -o addressbook
 echo "@@@@ ./addressbook (in various configurations)"
 ./addressbook write | ./addressbook read
 ./addressbook dwrite | ./addressbook dread