git squash commit for update_libcxx_imp.

e0c4b64
git squash commit for update_libcxx_imp.

3971b55
add top level headers starting from __ in libcxx.imp

3dcc3b7
underscore

0ac78d7
fmt

Author: atetubou

libcxx/utils/libcxx/header_information.py

@@ -192,25 +192,27 @@ def is_modulemap_header(header):
 assert libcxx_root.exists()
 
 all_headers = sorted(
-    p.relative_to(include).as_posix() for p in include.rglob("[a-z]*") if is_header(p)
+    p.relative_to(include).as_posix() for p in include.rglob("[_a-z]*") if is_header(p)
 )
 toplevel_headers = sorted(
-    p.relative_to(include).as_posix() for p in include.glob("[a-z]*") if is_header(p)
+    p.relative_to(include).as_posix() for p in include.glob("[_a-z]*") if is_header(p)
 )
 experimental_headers = sorted(
     p.relative_to(include).as_posix()
     for p in include.glob("experimental/[a-z]*")
     if is_header(p)
 )
-public_headers = toplevel_headers + experimental_headers
+public_headers = list(
+    filter(lambda x: not x.startswith("__"), toplevel_headers + experimental_headers)
+)
 
 # The headers used in the std and std.compat modules.
 #
 # This is the set of all C++23-and-later headers, excluding C compatibility headers.
 module_headers = [
     header
     for header in toplevel_headers
-    if not header.endswith(".h")
+    if not header.endswith(".h") and not header.startswith("__")
     # These headers have been removed in C++20 so are never part of a module.
     and not header in ["ccomplex", "ciso646", "cstdbool", "ctgmath"]
 ]