From 93a540d74c654819ad04d72fcdcf827d0e259999 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Fri, 26 Nov 2021 17:23:41 +0100
Subject: bpo-45866: pegen strips directory of "generated from" header
 (GH-29777) (GH-29792) (GH-29797)

"make regen-all" now produces the same output when run from a
directory other than the source tree: when building Python out of the
source tree.

(cherry picked from commit 253b7a0a9fef1d72a4cb87b837885576e68e917c)
(cherry picked from commit b6defde2afe656db830d6fedf74ca5f6225f5928)
---
 Misc/NEWS.d/next/Build/2021-11-25-13-53-36.bpo-45866.ZH1W8N.rst | 4 ++++
 Parser/pegen/parse.c                                            | 2 +-
 Tools/peg_generator/pegen/c_generator.py                        | 4 +++-
 Tools/peg_generator/pegen/grammar_parser.py                     | 2 +-
 Tools/peg_generator/pegen/python_generator.py                   | 4 +++-
 5 files changed, 12 insertions(+), 4 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Build/2021-11-25-13-53-36.bpo-45866.ZH1W8N.rst

diff --git a/Misc/NEWS.d/next/Build/2021-11-25-13-53-36.bpo-45866.ZH1W8N.rst b/Misc/NEWS.d/next/Build/2021-11-25-13-53-36.bpo-45866.ZH1W8N.rst
new file mode 100644
index 0000000..efa046d
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2021-11-25-13-53-36.bpo-45866.ZH1W8N.rst
@@ -0,0 +1,4 @@
+``make regen-all`` now produces the same output when run from a directory
+other than the source tree: when building Python out of the source tree.
+pegen now strips directory of the "generated by pygen from <FILENAME" header
+Patch by Victor Stinner.
diff --git a/Parser/pegen/parse.c b/Parser/pegen/parse.c
index 611257d..b80e27f 100644
--- a/Parser/pegen/parse.c
+++ b/Parser/pegen/parse.c
@@ -1,4 +1,4 @@
-// @generated by pegen.py from ./Grammar/python.gram
+// @generated by pegen.py from python.gram
 #include "pegen.h"
 
 #if defined(Py_DEBUG) && defined(Py_BUILD_CORE)
diff --git a/Tools/peg_generator/pegen/c_generator.py b/Tools/peg_generator/pegen/c_generator.py
index b5836f6..fe79717 100644
--- a/Tools/peg_generator/pegen/c_generator.py
+++ b/Tools/peg_generator/pegen/c_generator.py
@@ -1,5 +1,6 @@
 import ast
 from dataclasses import field, dataclass
+import os.path
 import re
 from typing import Any, Dict, IO, Optional, List, Text, Tuple, Set
 from enum import Enum
@@ -379,7 +380,8 @@ class CParserGenerator(ParserGenerator, GrammarVisitor):
 
     def generate(self, filename: str) -> None:
         self.collect_todo()
-        self.print(f"// @generated by pegen.py from {filename}")
+        basename = os.path.basename(filename)
+        self.print(f"// @generated by pegen.py from {basename}")
         header = self.grammar.metas.get("header", EXTENSION_PREFIX)
         if header:
             self.print(header.rstrip("\n"))
diff --git a/Tools/peg_generator/pegen/grammar_parser.py b/Tools/peg_generator/pegen/grammar_parser.py
index c784cfd..50a2153 100644
--- a/Tools/peg_generator/pegen/grammar_parser.py
+++ b/Tools/peg_generator/pegen/grammar_parser.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3.8
-# @generated by pegen from ./Tools/peg_generator/pegen/metagrammar.gram
+# @generated by pegen from metagrammar.gram
 
 import ast
 import sys
diff --git a/Tools/peg_generator/pegen/python_generator.py b/Tools/peg_generator/pegen/python_generator.py
index b786de7..530cf11 100644
--- a/Tools/peg_generator/pegen/python_generator.py
+++ b/Tools/peg_generator/pegen/python_generator.py
@@ -1,3 +1,4 @@
+import os.path
 import token
 from typing import Any, Dict, Optional, IO, Text, Tuple
 
@@ -142,7 +143,8 @@ class PythonParserGenerator(ParserGenerator, GrammarVisitor):
     def generate(self, filename: str) -> None:
         header = self.grammar.metas.get("header", MODULE_PREFIX)
         if header is not None:
-            self.print(header.rstrip("\n").format(filename=filename))
+            basename = os.path.basename(filename)
+            self.print(header.rstrip("\n").format(filename=basename))
         subheader = self.grammar.metas.get("subheader", "")
         if subheader:
             self.print(subheader.format(filename=filename))
-- 
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