p2300: add wg21 p2300 std_execution as a package (#32531)

var/spack/repos/builtin/packages/p2300/package.py

@@ -0,0 +1,21 @@
+# Copyright 2013-2022 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack.package import *
+
+
+class P2300(CMakePackage):
+    """The proposed C++ framework for asynchronous and parallel programming."""
+
+    homepage = "https://github.com/brycelelbach/wg21_p2300_std_execution"
+    git = "https://github.com/brycelelbach/wg21_p2300_std_execution.git"
+    maintainers = ["msimberg", "aurianer"]
+
+    version("main", branch="main")
+
+    depends_on("cmake@3.22.1:", type="build")
+
+    conflicts("%gcc@:10")
+    conflicts("%clang@:13")