Add pkg-config support.

c++/Makefile.am

@@ -117,6 +117,9 @@ includekjparsedir = $(includekjdir)/parse
 
 dist_includecapnp_DATA = $(public_capnpc_inputs)
 
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = capnp.pc capnp-rpc.pc
+
 includekj_HEADERS =                                            \
   src/kj/common.h                                              \
   src/kj/units.h                                               \

c++/capnp-rpc.pc.in

+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: Cap'n Proto RPC
+Description: Fast object-oriented RPC system
+Version: @VERSION@
+Libs: -L${libdir} -lcapnp-rpc -lkj-async
+Requires: capnp = @VERSION@
+Cflags: -I${includedir}

c++/capnp.pc.in

+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: Cap'n Proto
+Description: Insanely fast serialization system
+Version: @VERSION@
+Libs: -L${libdir} -lcapnp -lkj @PTHREAD_CFLAGS@ @PTHREAD_LIBS@
+Libs.private: @LIBS@
+Cflags: -I${includedir} @PTHREAD_CFLAGS@

c++/configure.ac

@@ -59,5 +59,5 @@ CXXFLAGS="$CXXFLAGS $PTHREAD_CFLAGS"
 ac_configure_args="$ac_configure_args 'CXX=$CXX'"
 AC_CONFIG_SUBDIRS([gtest])
 
-AC_CONFIG_FILES([Makefile])
+AC_CONFIG_FILES([Makefile capnp.pc capnp-rpc.pc])
 AC_OUTPUT

c++/samples/test.sh

@@ -6,16 +6,17 @@
 set -exuo pipefail
 
 capnpc -oc++ addressbook.capnp
-c++ -std=c++11 -Wall addressbook.c++ addressbook.capnp.c++ -lcapnp -lkj -pthread -o addressbook
+c++ -std=c++11 -Wall addressbook.c++ addressbook.capnp.c++ \
+    $(pkg-config --cflags --libs capnp) -o addressbook
 ./addressbook write | ./addressbook read
 ./addressbook dwrite | ./addressbook dread
 rm addressbook addressbook.capnp.c++ addressbook.capnp.h
 
 capnpc -oc++ calculator.capnp
-c++ -std=c++11 -Wall calculator-client.c++ calculator.capnp.c++ -lcapnp-rpc -lcapnp -lkj-async \
-    -lkj -pthread -o calculator-client
-c++ -std=c++11 -Wall calculator-server.c++ calculator.capnp.c++ -lcapnp-rpc -lcapnp -lkj-async \
-    -lkj -pthread -o calculator-server
+c++ -std=c++11 -Wall calculator-client.c++ calculator.capnp.c++ \
+    $(pkg-config --cflags --libs capnp-rpc) -o calculator-client
+c++ -std=c++11 -Wall calculator-server.c++ calculator.capnp.c++ \
+    $(pkg-config --cflags --libs capnp-rpc) -o calculator-server
 rm -f /tmp/capnp-calculator-example-$$
 ./calculator-server unix:/tmp/capnp-calculator-example-$$ &
 sleep 0.1