1 files changed, 87 insertions, 0 deletions
diff --git a/mesonbuild/dependencies/coarrays.py b/mesonbuild/dependencies/coarrays.py
new file mode 100644
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+++ b/mesonbuild/dependencies/coarrays.py
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+# Copyright 2013-2019 The Meson development team
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from __future__ import annotations
+
+import functools
+import typing as T
+
+from .base import DependencyMethods, detect_compiler, SystemDependency
+from .cmake import CMakeDependency
+from .pkgconfig import PkgConfigDependency
+from .factory import factory_methods
+
+if T.TYPE_CHECKING:
+    from . factory import DependencyGenerator
+    from ..environment import Environment, MachineChoice
+
+
+@factory_methods({DependencyMethods.PKGCONFIG, DependencyMethods.CMAKE, DependencyMethods.SYSTEM})
+def coarray_factory(env: 'Environment',
+                    for_machine: 'MachineChoice',
+                    kwargs: T.Dict[str, T.Any],
+                    methods: T.List[DependencyMethods]) -> T.List['DependencyGenerator']:
+    fcid = detect_compiler('coarray', env, for_machine, 'fortran').get_id()
+    candidates: T.List['DependencyGenerator'] = []
+
+    if fcid == 'gcc':
+        # OpenCoarrays is the most commonly used method for Fortran Coarray with GCC
+        if DependencyMethods.PKGCONFIG in methods:
+            for pkg in ['caf-openmpi', 'caf']:
+                candidates.append(functools.partial(
+                    PkgConfigDependency, pkg, env, kwargs, language='fortran'))
+
+        if DependencyMethods.CMAKE in methods:
+            if 'modules' not in kwargs:
+                kwargs['modules'] = 'OpenCoarrays::caf_mpi'
+            candidates.append(functools.partial(
+                CMakeDependency, 'OpenCoarrays', env, kwargs, language='fortran'))
+
+    if DependencyMethods.SYSTEM in methods:
+        candidates.append(functools.partial(CoarrayDependency, env, kwargs))
+
+    return candidates
+
+
+class CoarrayDependency(SystemDependency):
+    """
+    Coarrays are a Fortran 2008 feature.
+
+    Coarrays are sometimes implemented via external library (GCC+OpenCoarrays),
+    while other compilers just build in support (Cray, IBM, Intel, NAG).
+    Coarrays may be thought of as a high-level language abstraction of
+    low-level MPI calls.
+    """
+    def __init__(self, environment: 'Environment', kwargs: T.Dict[str, T.Any]) -> None:
+        super().__init__('coarray', environment, kwargs, language='fortran')
+        kwargs['required'] = False
+        kwargs['silent'] = True
+
+        cid = self.get_compiler().get_id()
+        if cid == 'gcc':
+            # Fallback to single image
+            self.compile_args = ['-fcoarray=single']
+            self.version = 'single image (fallback)'
+            self.is_found = True
+        elif cid == 'intel':
+            # Coarrays are built into Intel compilers, no external library needed
+            self.is_found = True
+            self.link_args = ['-coarray=shared']
+            self.compile_args = self.link_args
+        elif cid == 'intel-cl':
+            # Coarrays are built into Intel compilers, no external library needed
+            self.is_found = True
+            self.compile_args = ['/Qcoarray:shared']
+        elif cid == 'nagfor':
+            # NAG doesn't require any special arguments for Coarray
+            self.is_found = True