CMake workarounds for ubuntu capnproto 0.6.1 compatibility

CMakeLists.txt

@@ -8,9 +8,11 @@ include(CMakePushCheckState)
 include(CTest)
 include(CheckCXXSourceCompiles)
 find_package(Boost)
-find_package(CapnProto)
+find_package(CapnProto REQUIRED)
 find_package(Threads REQUIRED)
 
+include("cmake/capnp_compat.cmake")
+
 cmake_push_check_state()
 set(CMAKE_REQUIRED_LIBRARIES Threads::Threads)
 check_cxx_source_compiles("
@@ -73,8 +75,11 @@ install(TARGETS multiprocess EXPORT Multiprocess ARCHIVE DESTINATION lib PUBLIC_
 add_executable(mpgen src/mp/gen.cpp)
 target_include_directories(mpgen PRIVATE $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>)
 target_include_directories(mpgen PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include> $<INSTALL_INTERFACE:include>)
+target_link_libraries(mpgen PRIVATE CapnProto::capnp)
 target_link_libraries(mpgen PRIVATE CapnProto::capnp-rpc)
-target_link_libraries(mpgen PRIVATE -L${capnp_LIBRARY_DIRS} capnpc)
+target_link_libraries(mpgen PRIVATE CapnProto::capnpc)
+target_link_libraries(mpgen PRIVATE CapnProto::kj)
+target_link_libraries(mpgen PRIVATE Threads::Threads)
 target_link_libraries(mpgen PRIVATE multiprocess)
 set_target_properties(mpgen PROPERTIES
     INSTALL_RPATH_USE_LINK_PATH TRUE
@@ -89,7 +94,7 @@ install(FILES "include/mpgen.mk" DESTINATION "include")
 
 install(EXPORT Multiprocess DESTINATION lib/cmake/Multiprocess)
 
-if(BUILD_TESTING)
+if(BUILD_TESTING AND TARGET CapnProto::kj-test)
   add_custom_command(
     OUTPUT
       src/mp/test/foo.capnp.h
@@ -122,8 +127,12 @@ if(BUILD_TESTING)
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
     $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/src>
   )
+  target_link_libraries(mptest PRIVATE CapnProto::capnp)
   target_link_libraries(mptest PRIVATE CapnProto::capnp-rpc)
+  target_link_libraries(mptest PRIVATE CapnProto::kj)
+  target_link_libraries(mptest PRIVATE CapnProto::kj-async)
   target_link_libraries(mptest PRIVATE CapnProto::kj-test)
+  target_link_libraries(mptest PRIVATE Threads::Threads)
   target_link_libraries(mptest PRIVATE multiprocess)
   set_target_properties(mptest PROPERTIES
     CXX_STANDARD 14

cmake/capnp_compat.cmake

@@ -0,0 +1,60 @@
+# Copyright (c) 2019 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+# CMake target definitions for backwards compatibility with Ubuntu bionic
+# capnproto 0.6.1 package (https://packages.ubuntu.com/bionic/libcapnp-dev)
+
+include(CheckIncludeFileCXX)
+include(CMakePushCheckState)
+
+if (NOT DEFINED capnp_PREFIX AND DEFINED CAPNP_INCLUDE_DIRS)
+  get_filename_component(capnp_PREFIX "${CAPNP_INCLUDE_DIRS}" DIRECTORY)
+endif()
+
+if (NOT DEFINED CAPNPC_OUTPUT_DIR)
+  set(CAPNPC_OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}")
+endif()
+
+if (NOT DEFINED CAPNP_LIB_CAPNPC AND DEFINED CAPNP_LIB_CAPNP-RPC)
+  string(REPLACE "-rpc" "c" CAPNP_LIB_CAPNPC "${CAPNP_LIB_CAPNP-RPC}")
+endif()
+
+if (NOT DEFINED CapnProto_capnpc_IMPORTED_LOCATION AND DEFINED CapnProto_capnp-rpc_IMPORTED_LOCATION)
+  string(REPLACE "-rpc" "c" CapnProto_capnpc_IMPORTED_LOCATION "${CapnProto_capnp-rpc_IMPORTED_LOCATION}")
+endif()
+
+if (NOT TARGET CapnProto::capnp AND DEFINED CAPNP_LIB_CAPNP)
+  add_library(CapnProto::capnp SHARED IMPORTED)
+  set_target_properties(CapnProto::capnp PROPERTIES IMPORTED_LOCATION "${CAPNP_LIB_CAPNP}")
+endif()
+
+if (NOT TARGET CapnProto::capnpc AND DEFINED CAPNP_LIB_CAPNPC)
+  add_library(CapnProto::capnpc SHARED IMPORTED)
+  set_target_properties(CapnProto::capnpc PROPERTIES IMPORTED_LOCATION "${CAPNP_LIB_CAPNPC}")
+endif()
+
+if (NOT TARGET CapnProto::capnpc AND DEFINED CapnProto_capnpc_IMPORTED_LOCATION)
+  add_library(CapnProto::capnpc SHARED IMPORTED)
+  set_target_properties(CapnProto::capnpc PROPERTIES IMPORTED_LOCATION "${CapnProto_capnpc_IMPORTED_LOCATION}")
+endif()
+
+if (NOT TARGET CapnProto::capnp-rpc AND DEFINED CAPNP_LIB_CAPNP-RPC)
+  add_library(CapnProto::capnp-rpc SHARED IMPORTED)
+  set_target_properties(CapnProto::capnp-rpc PROPERTIES IMPORTED_LOCATION "${CAPNP_LIB_CAPNP-RPC}")
+endif()
+
+if (NOT TARGET CapnProto::kj AND DEFINED CAPNP_LIB_KJ)
+  add_library(CapnProto::kj SHARED IMPORTED)
+  set_target_properties(CapnProto::kj PROPERTIES IMPORTED_LOCATION "${CAPNP_LIB_KJ}")
+endif()
+
+if (NOT TARGET CapnProto::kj-async AND DEFINED CAPNP_LIB_KJ-ASYNC)
+  add_library(CapnProto::kj-async SHARED IMPORTED)
+  set_target_properties(CapnProto::kj-async PROPERTIES IMPORTED_LOCATION "${CAPNP_LIB_KJ-ASYNC}")
+endif()
+
+cmake_push_check_state()
+set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES} ${capnp_INCLUDE_DIRS})
+check_include_file_cxx("kj/filesystem.h" HAVE_KJ_FILESYSTEM)
+cmake_pop_check_state()

include/mp/config.h.in

@@ -7,6 +7,7 @@
 
 #cmakedefine CMAKE_INSTALL_PREFIX "@CMAKE_INSTALL_PREFIX@"
 #cmakedefine capnp_PREFIX "@capnp_PREFIX@"
+#cmakedefine HAVE_KJ_FILESYSTEM
 
 #cmakedefine HAVE_PTHREAD_GETNAME_NP @HAVE_PTHREAD_GETNAME_NP@
 #cmakedefine HAVE_PTHREAD_THREADID_NP @HAVE_PTHREAD_THREADID_NP@

src/mp/gen.cpp

@@ -550,10 +550,16 @@ int main(int argc, char** argv)
         exit(1);
     }
     std::vector<kj::StringPtr> import_paths;
+#ifdef HAVE_KJ_FILESYSTEM
     auto fs = kj::newDiskFilesystem();
     auto cwd = fs->getCurrentPath();
+#endif
     for (const char* path : {CMAKE_INSTALL_PREFIX "/include", capnp_PREFIX "/include"}) {
+#ifdef HAVE_KJ_FILESYSTEM
         KJ_IF_MAYBE(dir, fs->getRoot().tryOpenSubdir(cwd.evalNative(path))) { import_paths.emplace_back(path); }
+#else
+        import_paths.emplace_back(path);
+#endif
     }
     for (size_t i = 4; i < argc; ++i) {
         import_paths.push_back(argv[i]);