Make: liburing & asio deps

Uses `FetchContent_Declare` and much
more complex `ExternalProject_Add` to build
a recent version of `asio` and `liburing` locally
from source.

axboe/liburing#438
axboe/liburing#946

Borrowed from `unum-cloud/ucall`.

Author: ashvardanian

.vscode/settings.json

@@ -5,11 +5,15 @@
     "Adelstein",
     "Andreas",
     "ashvardanian",
+    "ASIO",
     "asynchrony",
+    "Axboe",
     "bioinformatics",
     "Boccara",
     "bootcamps",
     "Byrne",
+    "chriskohlhoffasio",
+    "jensaxboeliburing",
     "clflush",
     "consteval",
     "coro",
@@ -25,11 +29,14 @@
     "Hana",
     "Ibireme",
     "JeanHeyd",
+    "Jens",
+    "Kohlhoff",
     "Kulukundis",
     "Lelbach",
     "Lemire",
     "Lib",
     "libunifex",
+    "liburing",
     "Lohmann",
     "Maclaurin",
     "matmul",
@@ -63,6 +70,7 @@
     "unifex",
     "unsalvageable",
     "unscalable",
+    "Uring",
     "Vardanian",
     "Weis",
     "Yaoyuan",
@@ -93,6 +101,7 @@
     "bit": "cpp",
     "bitset": "cpp",
     "cctype": "cpp",
+    "cfenv": "cpp",
     "charconv": "cpp",
     "chrono": "cpp",
     "clocale": "cpp",
@@ -114,6 +123,7 @@
     "deque": "cpp",
     "exception": "cpp",
     "execution": "cpp",
+    "expected": "cpp",
     "format": "cpp",
     "forward_list": "cpp",
     "fstream": "cpp",
@@ -146,6 +156,7 @@
     "shared_mutex": "cpp",
     "source_location": "cpp",
     "span": "cpp",
+    "sstream": "cpp",
     "stdexcept": "cpp",
     "stop_token": "cpp",
     "streambuf": "cpp",
@@ -161,9 +172,6 @@
     "unordered_set": "cpp",
     "utility": "cpp",
     "variant": "cpp",
-    "vector": "cpp",
-    "sstream": "cpp",
-    "cfenv": "cpp",
-    "expected": "cpp"
+    "vector": "cpp"
   }
 }

CMakeLists.txt

@@ -34,7 +34,8 @@ find_package(Threads REQUIRED)
 find_package(OpenMP REQUIRED)
 
 set(FETCHCONTENT_QUIET OFF)
-include(FetchContent)
+include(FetchContent) # For CMake-friendly dependencies
+include(ExternalProject) # If the dependency is not CMake-friendly
 
 # GTest (required by Google Benchmark)
 FetchContent_Declare(
@@ -79,7 +80,7 @@ FetchContent_Declare(
   GIT_TAG master
 )
 
-# Suppress TBB’s own tests:
+# Suppress TBB's own tests:
 set(TBB_TEST OFF CACHE BOOL "Do not build TBB tests" FORCE)
 FetchContent_MakeAvailable(IntelTBB)
 
@@ -159,14 +160,55 @@ FetchContent_Declare(
 )
 FetchContent_MakeAvailable(NielsLohmannJSON)
 
-# Yaoyuan Guo YYJSON for more flexible & performant C-style parsing
+# Yaoyuan Guo's YYJSON for more flexible & performant C-style parsing
 FetchContent_Declare(
   YaoyuanGuoYYJSON
   GIT_REPOSITORY https://github.com/ibireme/yyjson.git
   GIT_TAG 0.10.0
 )
 FetchContent_MakeAvailable(YaoyuanGuoYYJSON)
 
+# Chris Kohlhoff's ASIO standalone, avoiding Boost... integration is a bit tricky:
+# https://github.com/cpm-cmake/CPM.cmake/blob/master/examples/asio-standalone/CMakeLists.txt
+FetchContent_Declare(
+  ChrisKohlhoffASIO
+  GIT_REPOSITORY https://github.com/chriskohlhoff/asio.git
+  GIT_TAG master
+)
+FetchContent_MakeAvailable(ChrisKohlhoffASIO)
+add_library(asio INTERFACE)
+target_include_directories(asio SYSTEM INTERFACE ${chriskohlhoffasio_SOURCE_DIR}/asio/include)
+target_compile_definitions(asio INTERFACE ASIO_STANDALONE ASIO_NO_DEPRECATED)
+
+# Jens Axboe's liburing to simplify I/O operations on Linux
+# https://github.com/axboe/liburing/pull/438
+# https://github.com/axboe/liburing/issues/946
+if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  set(LIBURING_DIR ${CMAKE_BINARY_DIR}/_deps/jensaxboeliburing)
+  ExternalProject_Add(
+      JensAxboeLibUring
+      GIT_REPOSITORY https://github.com/axboe/liburing.git
+      GIT_TAG liburing-2.8
+      GIT_SHALLOW 1
+      PREFIX ${CMAKE_BINARY_DIR}/_deps/
+      SOURCE_DIR ${LIBURING_DIR}
+      CONFIGURE_COMMAND echo Configuring LibUring && cd ${LIBURING_DIR} && ./configure --nolibc --cc=${CMAKE_C_COMPILER} --cxx=${CMAKE_CXX_COMPILER};
+      BUILD_COMMAND cd ${LIBURING_DIR} && make;
+      INSTALL_COMMAND ""
+      UPDATE_COMMAND ""
+  )
+  add_library(liburing_internal STATIC IMPORTED GLOBAL)
+  add_dependencies(liburing_internal JensAxboeLibUring)
+  set_property(TARGET liburing_internal
+      PROPERTY IMPORTED_LOCATION
+      ${LIBURING_DIR}/src/liburing.a
+  )
+  set_property(TARGET liburing_internal
+    PROPERTY INTERFACE_INCLUDE_DIRECTORIES
+    ${LIBURING_DIR}/src/include
+  )
+endif()
+
 # ------------------------------------------------------------------------------
 # Main Executable
 # ------------------------------------------------------------------------------
@@ -219,13 +261,18 @@ target_link_libraries(less_slow
     range-v3
     cppcoro
     unifex
+    asio
     stringzilla
     yyjson
     ctre
     # There is no `absl` shortcut:
     # https://github.com/abseil/abseil-cpp/blob/master/CMake/README.md#available-abseil-cmake-public-targets
     absl::flat_hash_map
     nlohmann_json::nlohmann_json
-    $<$<STREQUAL:${CMAKE_SYSTEM_NAME},Linux>:TBB::tbb>
-    $<$<STREQUAL:${CMAKE_SYSTEM_NAME},Linux>:OpenMP::OpenMP_CXX>
-)
+)
+
+if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  target_link_libraries(less_slow PRIVATE TBB::tbb)
+  target_link_libraries(less_slow PRIVATE OpenMP::OpenMP_CXX)
+  target_link_libraries(less_slow PRIVATE liburing_internal)
+endif()

README.md

@@ -59,6 +59,8 @@ The build will pull and compile several third-party dependencies from the source
 - Yaoyuan Guo's [yyjson](https://github.com/ibireme/yyjson) for faster JSON processing.
 - Google's [Abseil](https://github.com/abseil/abseil-cpp) replaces STL's associative containers.
 - Lewis Baker's [cppcoro](https://github.com/lewissbaker/cppcoro) implements C++20 coroutines.
+- Jens Axboe's [liburing](https://github.com/axboe/liburing) to simplify Linux kernel-bypass.
+- Chris Kohlhoff's [ASIO](https://github.com/chriskohlhoff/asio) as a [networking TS](https://en.cppreference.com/w/cpp/experimental/networking) extension.
 
 To control the output or run specific benchmarks, use the following flags:
 

less_slow.cpp

@@ -3908,8 +3908,16 @@ BENCHMARK(logging<log_fmt_t>)->Name("log_fmt")->MinTime(2);
  */
 #pragma region ASIO
 
+#include <asio.hpp>
+
 #pragma endregion // ASIO
 
+#pragma region IO Uring
+
+#include <liburing.h> // `liburing`
+
+#pragma endregion // IO Uring
+
 #pragma endregion // - Networking and Databases
 
 /**