Hi Brent,
In order to use RPC, you'll need to link against libcapnp-rpc and
libkj-async, in addition to libcapnp and libkj.
Let me know if that helps.
-Kenton
On Tue, Aug 15, 2017 at 12:25 PM, Brent Murphy <brentsamuelmur...@gmail.com>
wrote:
> Hi there,
>
> I'm trying to incorporate cap'n proto into a C++ server project. It's my
> first dabble with C++ so I'm struggling a bit and wondered if anyone could
> offer some advice on the error below?
>
> Many thanks,
> Brent
>
> Cmake error:
>
> cmake -H. -Bbuild ; cmake --build build -- -j3
>
> ✗ ✭ ✱
> -- Configuring done
> -- Generating done
> -- Build files have been written to: /Users/burt/Development/go/src/
> github.com/brentmurphy/piper_server/build
> Scanning dependencies of target piper_server
> [ 25%] Building CXX object CMakeFiles/piper_server.dir/src/main.cpp.o
> Apple LLVM version 8.1.0 (clang-802.0.42)
> Target: x86_64-apple-darwin16.7.0
> Thread model: posix
> InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/
> XcodeDefault.xctoolchain/usr/bin
> "/Applications/Xcode.app/Contents/Developer/Toolchains/
> XcodeDefault.xctoolchain/usr/bin/clang" -cc1 -triple
> x86_64-apple-macosx10.12.0 -Wdeprecated-objc-isa-usage
> -Werror=deprecated-objc-isa-usage -emit-obj -mrelax-all -disable-free
> -disable-llvm-verifier -discard-value-names -main-file-name main.cpp
> -mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim
> -masm-verbose -munwind-tables -target-cpu penryn -target-linker-version
> 278.4 -v -dwarf-column-info -debugger-tuning=lldb -coverage-file
> /Users/burt/Development/go/src/github.com/brentmurphy/
> piper_server/build/CMakeFiles/piper_server.dir/src/main.cpp.o
> -resource-dir /Applications/Xcode.app/Contents/Developer/Toolchains/
> XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.1.0 -I /usr/local/include
> -I /Users/burt/Development/go/src/github.com/brentmurphy/piper
> -stdlib=libc++ -std=c++11 -fdeprecated-macro -fdebug-compilation-dir
> /Users/burt/Development/go/src/github.com/brentmurphy/piper_server/build
> -ferror-limit 19 -fmessage-length 181 -stack-protector 1 -fblocks
> -fobjc-runtime=macosx-10.12.0 -fencode-extended-block-signature
> -fcxx-exceptions -fexceptions -fmax-type-align=16 -fdiagnostics-show-option
> -fcolor-diagnostics -o CMakeFiles/piper_server.dir/src/main.cpp.o -x c++
> /Users/burt/Development/go/src/github.com/brentmurphy/
> piper_server/src/main.cpp
> clang -cc1 version 8.1.0 (clang-802.0.42) default target
> x86_64-apple-darwin16.7.0
> ignoring nonexistent directory "/usr/include/c++/v1"
> ignoring duplicate directory "/usr/local/include"
> as it is a non-system directory that duplicates a system directory
> #include "..." search starts here:
> #include <...> search starts here:
> /Users/burt/Development/go/src/github.com/brentmurphy/piper
> /Applications/Xcode.app/Contents/Developer/Toolchains/
> XcodeDefault.xctoolchain/usr/bin/../include/c++/v1
> /usr/local/include
> /Applications/Xcode.app/Contents/Developer/Toolchains/
> XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.1.0/include
> /Applications/Xcode.app/Contents/Developer/Toolchains/
> XcodeDefault.xctoolchain/usr/include
> /usr/include
> /System/Library/Frameworks (framework directory)
> /Library/Frameworks (framework directory)
> End of search list.
> [ 50%] Linking CXX executable ../bin/piper_server
> Apple LLVM version 8.1.0 (clang-802.0.42)
> Target: x86_64-apple-darwin16.7.0
> Thread model: posix
> InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/
> XcodeDefault.xctoolchain/usr/bin
> "/Applications/Xcode.app/Contents/Developer/Toolchains/
> XcodeDefault.xctoolchain/usr/bin/ld" -demangle -lto_library
> /Applications/Xcode.app/Contents/Developer/Toolchains/
> XcodeDefault.xctoolchain/usr/lib/libLTO.dylib -dynamic -arch x86_64
> -macosx_version_min 10.12.0 -o ../bin/piper_server -search_paths_first
> -headerpad_max_install_names CMakeFiles/piper_server.dir/src/main.cpp.o
> CMakeFiles/piper_server.dir/Users/burt/Development/go/src/
> github.com/brentmurphy/piper/piper.capnp.c++.o
> CMakeFiles/piper_server.dir/Users/burt/Development/go/src/
> github.com/brentmurphy/piper/piper.rpc.capnp.c++.o /usr/local/lib/libkj.a
> /usr/local/lib/libcapnp.a -lc++ -lSystem /Applications/Xcode.app/
> Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/
> bin/../lib/clang/8.1.0/lib/darwin/libclang_rt.osx.a
> Undefined symbols for architecture x86_64:
>
> "capnp::Capability::Client::makeLocalClient(kj::Own<capnp::Capability::Server>&&)",
> referenced from:
> capnp::Capability::Client::Client<PiperServerImpl,
> void>(kj::Own<PiperServerImpl>&&) in main.cpp.o
> "capnp::Capability::Server::internalUnimplemented(char const*, char
> const*, unsigned long long, unsigned short)", referenced from:
>
> piper::rpc::Piper::Server::list(capnp::CallContext<piper::rpc::Piper::ListParams,
> piper::rpc::Piper::ListResults>) in piper.rpc.capnp.c++.o
>
> piper::rpc::Piper::Server::load(capnp::CallContext<piper::rpc::Piper::LoadParams,
> piper::rpc::Piper::LoadResults>) in piper.rpc.capnp.c++.o
> piper::rpc::Piper::Server::configure(capnp::CallContext<
> piper::rpc::Piper::ConfigureParams, piper::rpc::Piper::ConfigureResults>)
> in piper.rpc.capnp.c++.o
> piper::rpc::Piper::Server::process(capnp::CallContext<
> piper::rpc::Piper::ProcessParams, piper::rpc::Piper::ProcessResults>) in
> piper.rpc.capnp.c++.o
> piper::rpc::Piper::Server::finish(capnp::CallContext<
> piper::rpc::Piper::FinishParams, piper::rpc::Piper::FinishResults>) in
> piper.rpc.capnp.c++.o
> "capnp::Capability::Server::internalUnimplemented(char const*, unsigned
> long long)", referenced from:
> piper::rpc::Piper::Server::dispatchCall(unsigned long long,
> unsigned short, capnp::CallContext<capnp::AnyPointer, capnp::AnyPointer>)
> in piper.rpc.capnp.c++.o
> "capnp::Capability::Server::internalUnimplemented(char const*, unsigned
> long long, unsigned short)", referenced from:
> piper::rpc::Piper::Server::dispatchCallInternal(unsigned short,
> capnp::CallContext<capnp::AnyPointer, capnp::AnyPointer>) in
> piper.rpc.capnp.c++.o
> "capnp::EzRpcServer::getWaitScope()", referenced from:
> _main in main.cpp.o
> "capnp::EzRpcServer::EzRpcServer(capnp::Capability::Client,
> kj::StringPtr, unsigned int, capnp::ReaderOptions)", referenced from:
> _main in main.cpp.o
> "capnp::EzRpcServer::~EzRpcServer()", referenced from:
> _main in main.cpp.o
> "kj::_::NeverDone::wait(kj::WaitScope&) const", referenced from:
> _main in main.cpp.o
> ld: symbol(s) not found for architecture x86_64
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
> make[2]: *** [../bin/piper_server] Error 1
> make[1]: *** [CMakeFiles/piper_server.dir/all] Error 2
> make: *** [all] Error 2
>
> My CMakeLists.txt file is as follows:
>
> cmake_minimum_required(VERSION 3.9.1)
>
> project(PiperServer)
>
> set(PiperServer_VERSION_MAJOR 1)
> set(PiperServer_VERSION_MINOR 0)
>
> set(CMAKE_CXX_COMPILER clang++)
> set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -stdlib=libc++ -v")
> set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++")
>
> set(CMAKE_BINARY_DIR ${CMAKE_SOURCE_DIR}/bin)
> set(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR})
> set(LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR})
>
> set(SOURCE_DIR ${PROJECT_SOURCE_DIR}/src)
> set(DEV_DIR "/Users/burt/Development")
> set(PIPER_DIR "${DEV_DIR}/go/src/github.com/brentmurphy/piper")
>
> include_directories("/usr/local/include")
> include_directories("${PIPER_DIR}")
>
> find_library(libkj_location NAMES libkj.a)
> add_library(libkj STATIC IMPORTED)
> set_target_properties(libkj PROPERTIES IMPORTED_LOCATION ${libkj_location})
>
> find_library(libcapnp_location NAMES libcapnp.a)
> add_library(libcapnp STATIC IMPORTED)
> set_target_properties(libcapnp PROPERTIES IMPORTED_LOCATION
> ${libcapnp_location})
>
> file(GLOB SOURCES "${PIPER_DIR}/*.c++")
>
> add_executable(piper_server ${SOURCE_DIR}/main.cpp ${SOURCES})
>
> target_link_libraries( piper_server libkj libcapnp )
>
>
> And my server code (src/main.cpp):
>
> Enter code here#include <stdio.h>
> #include <string.h>
> #include <capnp/ez-rpc.h>
> #include <capnp/message.h>
> #include <capnp/serialize-packed.h>
> #include <kj/debug.h>
> #include <iostream>
>
> #include "piper.capnp.h"
> #include "piper.rpc.capnp.h"
>
> class PiperServerImpl final: public ::piper::rpc::Piper::Server {
> public:
> ::kj::Promise<void> list(ListContext context) override {
> return NULL;
> }
>
> ::kj::Promise<void> load(LoadContext context) override {
> return NULL;
> }
>
> ::kj::Promise<void> configure(ConfigureContext context) override {
> return NULL;
> }
>
> ::kj::Promise<void> process(ProcessContext context) override {
> return NULL;
> }
>
> ::kj::Promise<void> finish(FinishContext context) override {
> return NULL;
> }
>
> private:
> };
>
> int main(int argc, const char* argv[]) {
> // We expect one argument specifying the address to which
> // to bind and accept connections.
> if (argc != 2) {
> std::cerr << "usage: " << argv[0] << " ADDRESS[:PORT]"
> << std::endl;
> return 1;
> }
>
> // Set up the EzRpcServer, binding to port 5923 unless a
> // different port was specified by the user. Note that the
> // first parameter here can be any "Client" object or anything
> // that can implicitly cast to a "Client" object. You can even
> // re-export a capability imported from another server.
> capnp::EzRpcServer server(kj::heap<PiperServerImpl>(), argv[1], 5923);
> auto& waitScope = server.getWaitScope();
>
> // Run forever, accepting connections and handling requests.
> kj::NEVER_DONE.wait(waitScope);
> KJ_LOG(ERROR, "dasdas");
> }
> ...
>
>
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