From c960837b8fd83074bab5148236f3d0595468cea4 Mon Sep 17 00:00:00 2001
From: Alexander Kanavin <alex.kanavin@gmail.com>
Date: Thu, 16 Jan 2020 12:34:20 +0100
Subject: [PATCH] Makefile: do not compile .pyc in parallel

This was found to lock up builds, break reproducibility, and produce strange file ownership
races.

The upstream commit introducing the change was:
https://github.com/python/cpython/commit/1a2dd82f56bd813aacc570e172cefe55a8a41504

The build lock up issue is reported here:
https://bugs.python.org/issue45945

The repro failures are documented here:
https://autobuilder.yocto.io/pub/repro-fail/oe-reproducible-20211130-yr_o1a8d/packages/diff-html/

Upstream-Status: Inappropriate [see issues above]
Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>

---
 Makefile.pre.in | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/Makefile.pre.in b/Makefile.pre.in
index edd70d4..5e13ba2 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1601,30 +1601,30 @@ libinstall:	build_all $(srcdir)/Modules/xxmodule.c
 	fi
 	-PYTHONPATH=$(DESTDIR)$(LIBDEST)  $(RUNSHARED) \
 		$(PYTHON_FOR_BUILD) -Wi $(DESTDIR)$(LIBDEST)/compileall.py \
-		-j0 -d $(LIBDEST) -f \
+		-d $(LIBDEST) -f \
 		-x 'bad_coding|badsyntax|site-packages|lib2to3/tests/data' \
 		$(DESTDIR)$(LIBDEST)
 	-PYTHONPATH=$(DESTDIR)$(LIBDEST) $(RUNSHARED) \
 		$(PYTHON_FOR_BUILD) -Wi -O $(DESTDIR)$(LIBDEST)/compileall.py \
-		-j0 -d $(LIBDEST) -f \
+		-d $(LIBDEST) -f \
 		-x 'bad_coding|badsyntax|site-packages|lib2to3/tests/data' \
 		$(DESTDIR)$(LIBDEST)
 	-PYTHONPATH=$(DESTDIR)$(LIBDEST) $(RUNSHARED) \
 		$(PYTHON_FOR_BUILD) -Wi -OO $(DESTDIR)$(LIBDEST)/compileall.py \
-		-j0 -d $(LIBDEST) -f \
+		-d $(LIBDEST) -f \
 		-x 'bad_coding|badsyntax|site-packages|lib2to3/tests/data' \
 		$(DESTDIR)$(LIBDEST)
 	-PYTHONPATH=$(DESTDIR)$(LIBDEST) $(RUNSHARED) \
 		$(PYTHON_FOR_BUILD) -Wi $(DESTDIR)$(LIBDEST)/compileall.py \
-		-j0 -d $(LIBDEST)/site-packages -f \
+		-d $(LIBDEST)/site-packages -f \
 		-x badsyntax $(DESTDIR)$(LIBDEST)/site-packages
 	-PYTHONPATH=$(DESTDIR)$(LIBDEST) $(RUNSHARED) \
 		$(PYTHON_FOR_BUILD) -Wi -O $(DESTDIR)$(LIBDEST)/compileall.py \
-		-j0 -d $(LIBDEST)/site-packages -f \
+		-d $(LIBDEST)/site-packages -f \
 		-x badsyntax $(DESTDIR)$(LIBDEST)/site-packages
 	-PYTHONPATH=$(DESTDIR)$(LIBDEST) $(RUNSHARED) \
 		$(PYTHON_FOR_BUILD) -Wi -OO $(DESTDIR)$(LIBDEST)/compileall.py \
-		-j0 -d $(LIBDEST)/site-packages -f \
+		-d $(LIBDEST)/site-packages -f \
 		-x badsyntax $(DESTDIR)$(LIBDEST)/site-packages
 	-PYTHONPATH=$(DESTDIR)$(LIBDEST) $(RUNSHARED) \
 		$(PYTHON_FOR_BUILD) -m lib2to3.pgen2.driver $(DESTDIR)$(LIBDEST)/lib2to3/Grammar.txt