py-pythran: customize headers attribute (#33242)

var/spack/repos/builtin/packages/py-pythran/package.py

@@ -5,6 +5,8 @@
 
 import sys
 
+import llnl.util.filesystem as fs
+
 from spack.package import *
 
 
@@ -54,6 +56,13 @@ class PyPythran(PythonPackage):
     # https://github.com/serge-sans-paille/pythran/issues/1937
     conflicts("%apple-clang@13:", when="@:0.10")
 
+    @property
+    def headers(self):
+        # Pythran is mainly meant to be used as a compiler, so return no headers to
+        # avoid issue https://github.com/spack/spack/issues/33237 This can be refined
+        # later to allow using pythran also as a library.
+        return fs.HeaderList([])
+
     def patch(self):
         # Compiler is used at run-time to determine name of OpenMP library to search for
         cfg_file = join_path("pythran", "pythran-{0}.cfg".format(sys.platform))