unifex: add recipe

libunifex is a library for enabling C++ "Unified Executors" in C++20,
based on current standards work being proposed for C++23 (P2300)[1].
This library provides C++20 support for async and co-routines.

1. https://isocpp.org/files/papers/P2300R3.html

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/unifex/unifex_git.bb

@@ -0,0 +1,24 @@
+DESCRIPTION = "C++ Unified Executors library"
+HOMEPAGE = "https://github.com/facebookexperimental/libunifex"
+SECTION = "libs"
+LICENSE = "Apache-2.0-with-LLVM-exception"
+LIC_FILES_CHKSUM = "file://LICENSE.txt;md5=5b86506074cb3cdc493b4f96b73b2909"
+
+SRC_URI = "git://github.com/facebookexperimental/libunifex.git;branch=main;protocol=https"
+SRCREV = "9df21c58d34ce8a1cd3b15c3a7347495e29417a0"
+
+S = "${WORKDIR}/git"
+
+inherit cmake pkgconfig
+
+PACKAGECONFIG ??= "liburing"
+PACKAGECONFIG[liburing] = ",,liburing"
+
+EXTRA_OECMAKE += " \
+    -DBUILD_SHARED_LIBS=ON \
+    -DBUILD_TESTING=OFF \
+    -DCMAKE_CXX_STANDARD=20 \
+    -DUNIFEX_BUILD_EXAMPLES=OFF \
+    "
+
+BBCLASSEXTEND = "native nativesdk"