New package: Taskflow (#19138)

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

@@ -0,0 +1,35 @@
+# Copyright 2013-2020 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 import *
+from spack.compiler import UnsupportedCompilerFlag
+
+
+class Taskflow(CMakePackage):
+    """Taskflow helps you quickly write parallel tasks programs in
+    modern C++."""
+
+    homepage = "https://github.com/taskflow/taskflow"
+    url      = "https://github.com/taskflow/taskflow/archive/v2.7.0.tar.gz"
+    git      = "https://github.com/taskflow/taskflow.git"
+
+    version('master', branch='master')
+    version('2.7.0', sha256='bc2227dcabec86abeba1fee56bb357d9d3c0ef0184f7c2275d7008e8758dfc3e')
+
+    # Compiler must offer C++14 support
+    conflicts('%gcc@:4.8')
+    conflicts('%clang@:3.5')
+    conflicts('%apple-clang@:8.0.0')
+    # untested: conflicts('%intel@:15')
+    # untested: conflicts('%pgi@:14')
+
+    def cmake_args(self):
+        try:
+            self.compiler.cxx14_flag
+        except UnsupportedCompilerFlag:
+            InstallError('Taskflow requires a C++14-compliant C++ compiler')
+
+        args = []
+        return args