Subject: Bug#1139593: python3.14: Please build with -fno-thread-jumps instead of -O1 on m68k

Source: python3.14
Version: 3.14.5-1
Severity: normal
Tags: patch
X-Debbugs-Cc: debian-68k@lists.debian.org
User: debian-68k@lists.debian.org
Usertags: m68k
Hello,
after lots of testing, it was discovered that the lockup problem of CPython
on m68k is caused by the -fthread-jumps optimization. [1]
Thus, it's therefore not necessary to build the whole interpretor with -O1, it's enough to turn that optimization off with -fno-thread-jumps.
Could you just pass -fno-thread-jumps in debian/rules to CFLAGS instead of
-O1?
--- debian/rules.orig 2026-05-11 03:38:08.000000000 +0200
+++ debian/rules 2026-06-10 00:40:31.672179962 +0200
@@ -204,8 +204,8 @@
endif

ifneq (,$(filter $(DEB_HOST_ARCH), m68k))
- OPT_CFLAGS += $(filter-out -O%,$(DPKG_CFLAGS)) -O1
- OPT_PIE_CFLAGS += $(filter-out -O%,$(DPKG_PIE_CFLAGS)) -O1
+ OPT_CFLAGS += -fno-thread-jumps
+ OPT_PIE_CFLAGS += -fno-thread-jumps
endif

ifeq ($(DEB_HOST_GNU_TYPE),$(DEB_BUILD_GNU_TYPE))
Thanks,
Adrian
--
.''`. John Paul Adrian Glaubitz
: :' : Debian Developer
`. `' Physicist
`- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913

--- debian/rules.orig 2026-05-11 03:38:08.000000000 +0200
+++ debian/rules 2026-06-10 00:40:31.672179962 +0200
@@ -204,8 +204,8 @@
endif

ifneq (,$(filter $(DEB_HOST_ARCH), m68k))
- OPT_CFLAGS += $(filter-out -O%,$(DPKG_CFLAGS)) -O1
- OPT_PIE_CFLAGS += $(filter-out -O%,$(DPKG_PIE_CFLAGS)) -O1
+ OPT_CFLAGS += -fno-thread-jumps
+ OPT_PIE_CFLAGS += -fno-thread-jumps
endif

ifeq ($(DEB_HOST_GNU_TYPE),$(DEB_BUILD_GNU_TYPE))


--- PyGate Linux v1.5.15
* Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)