vdt: add simd variant (#12188)

1. add simd variant and check target.
2. build on source directory before 0.3.8.

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

@@ -4,6 +4,7 @@
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
 from spack import *
+from spack.spec import ConflictsInSpecError
 
 
 class Vdt(CMakePackage):
@@ -18,3 +19,64 @@ class Vdt(CMakePackage):
     version('0.3.8', '25b07c72510aaa95fffc11e33579061c')
     version('0.3.7', 'd2621d4c489894fd1fe8e056d9a0a67c')
     version('0.3.6', '6eaff3bbbd5175332ccbd66cd71a741d')
+
+    simd_x86 = ('sse', 'avx', 'avx2', 'fma')
+    simd_all = ('sse', 'avx', 'avx2', 'fma', 'neon')
+    variant(
+        'simd',
+        default='None',
+        values=simd_all,
+        description='USE simd instruction set',
+        multi=True
+    )
+
+    def flag_handler(self, name, flags):
+        arch = ''
+        spec = self.spec
+        if (spec.satisfies("platform=cray")):
+            # FIXME; It is assumed that cray is x86_64.
+            # If you support arm on cray, you need to fix it.
+            arch = 'x86_64'
+        if (arch != 'x86_64' and not spec.satisfies("target=x86_64")):
+            for s in self.simd_x86:
+                if (spec.satisfies("simd={0}".format(s))):
+                    raise ConflictsInSpecError(
+                        spec,
+                        [(
+                            spec,
+                            spec.architecture.target,
+                            spec.variants['simd'],
+                            'simd=sse,avx,avx2 and fma are valid'
+                            ' only on x86_64'
+                        )]
+                    )
+        # FIXME: It is assumed that arm 32 bit target is arm.
+        if (arch != 'arm' and not spec.satisfies("target=arm")):
+            if (spec.satisfies("simd=neon")):
+                raise ConflictsInSpecError(
+                    spec,
+                    [(
+                        spec,
+                        spec.architecture.target,
+                        spec.variants['simd'],
+                        'simd=neon is valid only on arm 32 bit'
+                    )]
+                )
+        return (flags, None, None)
+
+    @property
+    def build_directory(self):
+        d = join_path(self.stage.path, 'spack-build')
+        if self.spec.satisfies('@:0.3.8'):
+            d = self.stage.source_path
+        return d
+
+    def cmake_args(self):
+        options = []
+
+        for s in self.simd_all:
+            options.append(
+                "-D{0}=".format(s.upper()) +
+                ("ON" if (s in self.spec.variants['simd'].value) else "OFF")
+            )
+        return options