Subject: [bug#54376] [PATCH] gnu: python-mypy: Fix test errors on i686-linux.

From: itd <[email-masked]>
Date: Sun, 13 Mar 2022 21:08:03 +0100

>From a8de61a3f6ca50bf4a68222532029e8e9e84c510 Mon Sep 17 00:00:00 2001

* gnu/packages/patches/python-mypy-12332.patch: New patch.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/python-check.scm (python-mypy)[source]<origin>: Use patch
"python-mypy-12332.patch" to avoid overflow issues resulting in test failures.
---
Hi,

currently, python-mypy on i686-linux does not build [0] due to test
errors [1].  To my knowledge, the merged fix [2] is not part of a
release yet.  But, it [2] fixes the python-mypy build for me.  Please
consider applying it.  Thanks!

[0]: https://ci.guix.gnu.org/build/484670/details
[1]: https://github.com/python/mypy/issues/11148
[2]: https://github.com/python/mypy/pull/12332

Regards
itd

 gnu/local.mk                                 |  1 +
 gnu/packages/patches/python-mypy-12332.patch | 68 ++++++++++++++++++++
 gnu/packages/python-check.scm                |  4 +-
 3 files changed, 72 insertions(+), 1 deletion(-)
 create mode 100644 gnu/packages/patches/python-mypy-12332.patch

diff --git a/gnu/local.mk b/gnu/local.mk
index 484757b207..05d01c858f 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1716,6 +1716,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/python-versioneer-guix-support.patch	\
   %D%/packages/patches/python-waitress-fix-tests.patch		\
   %D%/packages/patches/python-werkzeug-tests.patch		\
+  %D%/packages/patches/python-mypy-12332.patch			\
   %D%/packages/patches/qemu-build-info-manual.patch		\
   %D%/packages/patches/qemu-glibc-2.27.patch 			\
   %D%/packages/patches/qemu-glibc-2.30.patch 			\
diff --git a/gnu/packages/patches/python-mypy-12332.patch b/gnu/packages/patches/python-mypy-12332.patch
new file mode 100644
index 0000000000..d43cf42ed1
--- /dev/null
+++ b/gnu/packages/patches/python-mypy-12332.patch
@@ -0,0 +1,68 @@
+From 518c864805dd93e62d59439e665a0ce9d6778419 Mon Sep 17 00:00:00 2001
+From: Ekin Dursun <[email-masked]>
+Date: Thu, 10 Mar 2022 22:06:48 +0300
+Subject: [PATCH] mypyc: Fix overflow in id function (CPyTagged_Id)
+
+In CPython, the id of an object is its address. It's computed by
+converting the pointer to an unsigned integer (PyLong_FromVoidPtr). A
+similar logic is present here, pointer is converted to a Py_ssize_t and
+CPyTagged_FromSsize_t is called with that integer.
+
+There is a problem with that approach: Py_ssize_t cannot hold every
+pointer value. Sometimes overflow happens and CPyTagged_FromSsize_t is
+called with a negative integer.
+
+With the new approach, the number is checked: If it fits in a
+Py_ssize_t, CPyTagged_FromSsize_t is called. If not, it is directly
+converted to a PyObject using PyLong_FromVoidPtr.
+---
+ mypyc/lib-rt/CPy.h      | 1 +
+ mypyc/lib-rt/int_ops.c  | 9 +++++++++
+ mypyc/lib-rt/misc_ops.c | 2 +-
+ 3 files changed, 11 insertions(+), 1 deletion(-)
+
+diff --git a/mypyc/lib-rt/CPy.h b/mypyc/lib-rt/CPy.h
+index 987819154ab..9f5ae52d4e4 100644
+--- a/mypyc/lib-rt/CPy.h
++++ b/mypyc/lib-rt/CPy.h
+@@ -121,6 +121,7 @@ static inline size_t CPy_FindAttrOffset(PyTypeObject *trait, CPyVTableItem *vtab
+ 
+ 
+ CPyTagged CPyTagged_FromSsize_t(Py_ssize_t value);
++CPyTagged CPyTagged_FromVoidPtr(void *ptr);
+ CPyTagged CPyTagged_FromObject(PyObject *object);
+ CPyTagged CPyTagged_StealFromObject(PyObject *object);
+ CPyTagged CPyTagged_BorrowFromObject(PyObject *object);
+diff --git a/mypyc/lib-rt/int_ops.c b/mypyc/lib-rt/int_ops.c
+index 1275f2c1057..edf06314161 100644
+--- a/mypyc/lib-rt/int_ops.c
++++ b/mypyc/lib-rt/int_ops.c
+@@ -26,6 +26,15 @@ CPyTagged CPyTagged_FromSsize_t(Py_ssize_t value) {
+     }
+ }
+ 
++CPyTagged CPyTagged_FromVoidPtr(void *ptr) {
++    if ((uintptr_t)ptr > PY_SSIZE_T_MAX) {
++        PyObject *object = PyLong_FromVoidPtr(ptr);
++        return ((CPyTagged)object) | CPY_INT_TAG;
++    } else {
++        return CPyTagged_FromSsize_t((Py_ssize_t)ptr);
++    }
++}
++
+ CPyTagged CPyTagged_FromObject(PyObject *object) {
+     int overflow;
+     // The overflow check knows about CPyTagged's width
+diff --git a/mypyc/lib-rt/misc_ops.c b/mypyc/lib-rt/misc_ops.c
+index cebd1cf997f..dcce89d9072 100644
+--- a/mypyc/lib-rt/misc_ops.c
++++ b/mypyc/lib-rt/misc_ops.c
+@@ -437,7 +437,7 @@ CPyPickle_GetState(PyObject *obj)
+ }
+ 
+ CPyTagged CPyTagged_Id(PyObject *o) {
+-    return CPyTagged_FromSsize_t((Py_ssize_t)o);
++    return CPyTagged_FromVoidPtr(o);
+ }
+ 
+ #define MAX_INT_CHARS 22
diff --git a/gnu/packages/python-check.scm b/gnu/packages/python-check.scm
index 05a378601f..5bbe544113 100644
--- a/gnu/packages/python-check.scm
+++ b/gnu/packages/python-check.scm
@@ -1658,7 +1658,9 @@ supported by the MyPy typechecker.")
        (file-name (git-file-name name version))
        (sha256
         (base32
-         "1v83flrdxh8grcp40qw04q4hzjflih9xwib64078vsxv2w36f817"))))
+         "1v83flrdxh8grcp40qw04q4hzjflih9xwib64078vsxv2w36f817"))
+       (patches
+        (search-patches "python-mypy-12332.patch"))))
     (build-system python-build-system)
     (arguments
      `(#:phases
-- 
2.30.2