ENH patch data for fftw

recipe/gen_patch_json.py

@@ -417,11 +417,13 @@ def _gen_new_index(repodata, subdir):
         if subdir == "osx-64":
             _fix_libgfortran(fn, record)
             _fix_libcxx(fn, record)
-
             full_pkg_name = fn.replace('.tar.bz2', '')
             if full_pkg_name in OSX_SDK_FIXES:
                 _set_osx_virt_min(fn, record, OSX_SDK_FIXES[full_pkg_name])
 
+        # make sure fftw is bounded properly
+        _fix_fftw_3x_pins(fn, record)
+
     return index
 
 
@@ -439,6 +441,30 @@ def _rename_dependency(fn, record, old_name, new_name):
         record['depends'] = depends
 
 
+def _fix_fftw_3x_pins(fn, record):
+    """For fftw 3, we should add an upper bound of <4.0.0.a0"""
+    depends = record.get("depends", ())
+    dep_idx = next(
+        (q for q, dep in enumerate(depends)
+         if dep.split(' ')[0] == "fftw"),
+        None
+    )
+    if dep_idx is not None:
+        if depends[dep_idx] == 'fftw':
+            # this case is ambiguous so pass on fixing
+            pass
+        elif '>=3' not in depends[dep_idx]:
+            # here we have some other version so pass again
+            pass
+        elif '<4' in depends[dep_idx]:
+            # already has an upper bound so pass again
+            pass
+        else:
+            # by here, we have a dep of fftw with >=3 in it and <4 not
+            depends[dep_idx] = depends[dep_idx] + ",<4.0.0.a0"
+            record['depends'] = depends
+
+
 def _fix_libgfortran(fn, record):
     depends = record.get("depends", ())
     dep_idx = next(