diff options
| -rw-r--r-- | Include/objimpl.h | 6 | ||||
| -rw-r--r-- | Misc/NEWS.d/next/Core and Builtins/2019-05-15-18-28-43.bpo-27987.FaxuLy.rst | 2 |
2 files changed, 7 insertions, 1 deletions
diff --git a/Include/objimpl.h b/Include/objimpl.h index 057bb50cbd..0436ba7899 100644 --- a/Include/objimpl.h +++ b/Include/objimpl.h @@ -255,7 +255,11 @@ typedef union _gc_head { union _gc_head *gc_prev; Py_ssize_t gc_refs; } gc; - double dummy; /* force worst-case alignment */ + long double dummy; /* force worst-case alignment */ + // malloc returns memory block aligned for any built-in types and + // long double is the largest standard C type. + // On amd64 linux, long double requires 16 byte alignment. + // See bpo-27987 for more discussion. } PyGC_Head; extern PyGC_Head *_PyGC_generation0; diff --git a/Misc/NEWS.d/next/Core and Builtins/2019-05-15-18-28-43.bpo-27987.FaxuLy.rst b/Misc/NEWS.d/next/Core and Builtins/2019-05-15-18-28-43.bpo-27987.FaxuLy.rst new file mode 100644 index 0000000000..97ca37b262 --- /dev/null +++ b/Misc/NEWS.d/next/Core and Builtins/2019-05-15-18-28-43.bpo-27987.FaxuLy.rst @@ -0,0 +1,2 @@ +``PyGC_Head`` structure is aligned to ``long double``. This is needed to +GC-ed objects are aligned properly. Patch by Inada Naoki. |