libunifex: add package (#5485)

* libunifex: add package

* Fix missing dep: cmake

* Include "v" prefix in version

* Drop Windows support

* Patch missing header `<cstring>` for `std::memset`

* Require C++20 with coroutine support

* Recover Windows support

* Require VS 2022 on Windows

* Reformat

* Fix incorrect config

* fix bsd and windows shared

* Update xmake.lua

---------

Co-authored-by: star9029 <hengxings783@gmail.com>
Co-authored-by: ruki <waruqi@gmail.com>

packages/l/libunifex/patches/v0.4.0/std-memset.patch

@@ -0,0 +1,13 @@
+diff --git a/source/win32/low_latency_iocp_context.cpp b/source/win32/low_latency_iocp_context.cpp
+index 3941c87..db8c293 100644
+--- a/source/win32/low_latency_iocp_context.cpp
++++ b/source/win32/low_latency_iocp_context.cpp
+@@ -19,6 +19,7 @@
+ #include <unifex/scope_guard.hpp>
+ #include <unifex/exception.hpp>
+ 
++#include <cstring>
+ #include <atomic>
+ #include <random>
+ #include <system_error>
+ 

packages/l/libunifex/xmake.lua

@@ -0,0 +1,59 @@
+package("libunifex")
+    set_homepage("https://github.com/facebookexperimental/libunifex")
+    set_description("The 'libunifex' project is a prototype implementation of the C++ sender/receiver async programming model that is currently being considered for standardisation.")
+    set_license("Apache-2.0")
+
+    add_urls("https://github.com/facebookexperimental/libunifex/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/facebookexperimental/libunifex.git")
+
+    add_versions("v0.4.0", "d5ce3b616e166da31e6b4284764a1feeba52aade868bcbffa94cfd86b402716e")
+
+    add_patches("v0.4.0", "patches/v0.4.0/std-memset.patch", "8108bf13b8071cff16e6d96bf97399ed3e657f59d6a843a078e42e4b3318def4")
+
+    if is_plat("linux", "bsd") then
+        add_syslinks("pthread")
+    end
+
+    add_deps("cmake")
+
+    if on_check then
+        on_check(function (package)
+            if package:is_plat("windows") then
+                local vs_toolset = package:toolchain("msvc"):config("vs_toolset")
+                if vs_toolset then
+                    local vs_toolset_ver = import("core.base.semver").new(vs_toolset)
+                    local minor = vs_toolset_ver:minor()
+                    assert(minor and minor >= 30, "package(libunifex) require vs_toolset >= 14.3")
+                end
+            end
+            assert(package:has_cxxincludes("coroutine", {configs = {languages = "c++20"}}), "package(libunifex) require C++20 with coroutine support")
+        end)
+    end
+
+    on_install(function (package)
+        local configs = {"-DBUILD_TESTING=OFF", "-DUNIFEX_BUILD_EXAMPLES=OFF", "-DCMAKE_CXX_STANDARD=20"}
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:is_debug() and "Debug" or "Release"))
+        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+        if package:is_plat("windows") then
+            table.insert(configs, "-DCMAKE_COMPILE_PDB_OUTPUT_DIRECTORY=''")
+            if package:config("shared") then
+                table.insert(configs, "-DCMAKE_WINDOWS_EXPORT_ALL_SYMBOLS=ON")
+            end
+        end
+        import("package.tools.cmake").install(package, configs)
+
+        if package:is_plat("windows") and package:is_debug() then
+            local dir = package:installdir(package:config("shared") and "bin" or "lib")
+            os.vcp(path.join(package:buildir(), "source/**.pdb"), dir)
+        end
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            using namespace unifex;
+            using namespace std::chrono;
+            auto delay(milliseconds ms) {
+                return schedule_after(current_scheduler, ms);
+            }
+        ]]}, {configs = {languages = "c++20"}, includes = {"chrono", "unifex/on.hpp", "unifex/scheduler_concepts.hpp"}}))
+    end)