octave: add support for MKL (#25952)

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

@@ -3,6 +3,7 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 import os.path
+import re
 import shutil
 import sys
 import tempfile
@@ -160,10 +161,19 @@ def configure_args(self):
         config_args = []
 
         # Required dependencies
-        config_args.extend([
-            "--with-blas=%s" % spec['blas'].libs.ld_flags,
-            "--with-lapack=%s" % spec['lapack'].libs.ld_flags
-        ])
+        if '^mkl' in spec and 'gfortran' in self.compiler.fc:
+            mkl_re = re.compile(r'(mkl_)intel(_i?lp64\b)')
+            config_args.extend([
+                mkl_re.sub(r'\g<1>gf\g<2>',
+                           '--with-blas={0}'.format(
+                               spec['blas'].libs.ld_flags)),
+                '--with-lapack'
+            ])
+        else:
+            config_args.extend([
+                '--with-blas={0}'.format(spec['blas'].libs.ld_flags),
+                '--with-lapack={0}'.format(spec['lapack'].libs.ld_flags)
+            ])
 
         # Strongly recommended dependencies
         if '+readline' in spec: