Write a minimal CMakeLists.txt for c++/samples

c++/samples/CMakeLists.txt

+# A Cap'n Proto sample project.
+#
+# To build (non-MSVC):
+#   1. Install Cap'n Proto somewhere ($PREFIX below):
+#
+#      mkdir capnproto/build
+#      cd capnproto/build
+#      cmake ../c++ -DCMAKE_INSTALL_PREFIX=$PREFIX
+#      cmake --build . --target install
+#      export PATH=$PREFIX/bin:$PATH
+#
+#   2. Ensure Cap'n Proto's executables are on the PATH, then build the sample project:
+#
+#      export PATH=$PREFIX/bin:$PATH
+#      mkdir ../build-samples
+#      cd ../build-samples
+#      cmake ../c++/samples
+#      cmake --build .
+#
+# Caveat for MSVC:
+#
+#   MSVC cannot yet build the Cap'n Proto executables, so there won't be any `$PREFIX/bin` directory
+#   to put on the PATH. To work around this, you can use CMAKE_PREFIX_PATH or CMAKE_MODULE_PATH to
+#   find the installed MSVC-built Cap'n Proto package, and set CAPNP_EXECUTABLE and
+#   CAPNPC_CXX_EXECUTABLE to the MinGW-built executables manually.
+#
+#   Here's an example step 2, assuming a MinGW-built Cap'n Proto is installed at $PREFIX_MINGW and
+#   an MSVC-built Cap'n Proto is installed at $PREFIX_MSVC:
+#
+#      mkdir ../build-samples
+#      cd ../build-samples
+#      cmake ../c++/samples -DCMAKE_PREFIX_PATH=$PREFIX_MSVC \
+#          -DCAPNP_EXECUTABLE=$PREFIX_MINGW/bin/capnp.exe \
+#          -DCAPNPC_CXX_EXECUTABLE=$PREFIX_MINGW/bin/capnpc-c++.exe
+#      cmake --build .
+
+project("Cap'n Proto Samples" CXX)
+cmake_minimum_required(VERSION 3.0)
+
+find_package(CapnProto CONFIG REQUIRED)
+
+capnp_generate_cpp(addressbookSources addressbookHeaders addressbook.capnp)
+add_executable(addressbook addressbook.c++ ${addressbookSources})
+target_link_libraries(addressbook CapnProto::capnp)
+target_include_directories(addressbook PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
+
+capnp_generate_cpp(calculatorSources calculatorHeaders calculator.capnp)
+add_executable(calculator-client calculator-client.c++ ${calculatorSources})
+add_executable(calculator-server calculator-server.c++ ${calculatorSources})
+target_link_libraries(calculator-client CapnProto::capnp-rpc)
+target_link_libraries(calculator-server CapnProto::capnp-rpc)
+target_include_directories(calculator-client PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
+target_include_directories(calculator-server PRIVATE ${CMAKE_CURRENT_BINARY_DIR})