[3.13] GH-115869: Make jit_stencils.h reproducible (GH-127166) (#154988)

https://github.com/python/cpython/commit/9b670079496f3824b5d58da320734ae30f26a355
commit: 9b670079496f3824b5d58da320734ae30f26a355
branch: 3.13
author: Bernhard M. Wiedemann <[email protected]>
committer: Yhg1s <[email protected]>
date: 2026-08-04T10:59:51+02:00
summary:

[3.13] GH-115869: Make jit_stencils.h reproducible (GH-127166) (#154988)

Keep the build tmpdir out of jit_stencils.h

llvm-objdump prints the path of the object file it disassembles, and the
JIT builds every stencil in a fresh tempfile.TemporaryDirectory().  That
random path ended up verbatim in the disassembly comments of the
generated jit_stencils.h, so two builds of the same source never produced
the same header:

     // /tmp/tmp164olvmi/_BINARY_OP.o:  file format elf64-x86-64
    +// /tmp/tmpmufvewt2/_BINARY_OP.o:  file format elf64-x86-64

Replace the full path with the bare file name.

Only the _parse() hunk of that commit is taken here; the rest of it
depends on refactorings that are not in 3.13.

(cherry picked from commit 17c16aea66b606d66f71ae9af381bc34d0ef3f5f)

Co-authored-by: Brandt Bucher <[email protected]>

files:
A Misc/NEWS.d/next/Build/2024-11-22-08-46-46.gh-issue-115869.UVLSKd.rst
M Tools/jit/_targets.py

diff --git a/Misc/NEWS.d/next/Build/2024-11-22-08-46-46.gh-issue-115869.UVLSKd.rst b/Misc/NEWS.d/next/Build/2024-11-22-08-46-46.gh-issue-115869.UVLSKd.rst
new file mode 100644
index 000000000000000..9e8a078983f20b5
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2024-11-22-08-46-46.gh-issue-115869.UVLSKd.rst
@@ -0,0 +1 @@
+Make ``jit_stencils.h`` (which is produced during JIT builds) reproducible.
diff --git a/Tools/jit/_targets.py b/Tools/jit/_targets.py
index c50bd63545c2fe4..55f2332136cba92 100644
--- a/Tools/jit/_targets.py
+++ b/Tools/jit/_targets.py
@@ -65,8 +65,10 @@ async def _parse(self, path: pathlib.Path) -> _stencils.StencilGroup:
         args = ["--disassemble", "--reloc", f"{path}"]
         output = await _llvm.maybe_run("llvm-objdump", args, echo=self.verbose)
         if output is not None:
+            # Make sure that full paths don't leak out (for reproducibility):
+            long, short = str(path), str(path.name)
             group.code.disassembly.extend(
-                line.expandtabs().strip()
+                line.expandtabs().strip().replace(long, short)
                 for line in output.splitlines()
                 if not line.isspace()
             )

_______________________________________________
Python-checkins mailing list -- [email protected]
To unsubscribe send an email to [email protected]
https://mail.python.org/mailman3//lists/python-checkins.python.org
Member address: [email protected]