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CHANGES.rst

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    Cython Changelog

    0.29.21 (2020-0?-??)

    Bugs fixed

    • Fix a regression in 0.29.20 where __div__ failed to be found in extension types. (Github issue #3688)
    • exec() did not allow recent Python syntax features in Py3.8+ due to https://bugs.python.org/issue35975. (Github issue #3695)
    • Binding staticmethods of Cython functions were not behaving like Python methods in Py3. Patch by Jeroen Demeyer and Michał Górny. (Github issue #3106)
    • The deprecated C-API function PyUnicode_FromUnicode() is no longer used. Original patch by Inada Naoki. (Github issue #3677)

    0.29.20 (2020-06-10)

    Bugs fixed

    • Nested try-except statements with multiple return statements could crash due to incorrect deletion of the except as target variable. (Github issue #3666)
    • The @classmethod decorator no longer rejects unknown input from other decorators. Patch by David Woods. (Github issue #3660)
    • Fused types could leak into unrelated usages. Patch by David Woods. (Github issue #3642)
    • Now uses Py_SET_SIZE() and Py_SET_REFCNT() in Py3.9+ to avoid low-level write access to these object fields. Patch by Victor Stinner. (Github issue #3639)
    • The built-in abs() function could lead to undefined behaviour when used on the negative-most value of a signed C integer type. Patch by Serge Guelton. (Github issue #1911)
    • Usages of sizeof() and typeid() on uninitialised variables no longer produce a warning. Patch by Celelibi. (Github issue #3575)
    • The C++ typeid() function was allowed in C mode. Patch by Celelibi. (Github issue #3637)
    • The error position reported for errors found in f-strings was misleading. (Github issue #3674)
    • The new c_api_binop_methods directive was added for forward compatibility, but can only be set to True (the current default value). It can be disabled in Cython 3.0.

    0.29.19 (2020-05-20)

    Bugs fixed

    • A typo in Windows specific code in 0.29.18 was fixed that broke "libc.math". (Github issue #3622)
    • A platform specific test failure in 0.29.18 was fixed. Patch by smutch. (Github issue #3620)

    0.29.18 (2020-05-18)

    Bugs fixed

    • Exception position reporting could run into race conditions on threaded code. It now uses function-local variables again.
    • Error handling early in the module init code could lead to a crash.
    • Error handling in cython.array creation was improved to avoid calling C-API functions with an error held.
    • A memory corruption was fixed when garbage collection was triggered during calls to PyType_Ready() of extension type subclasses. (Github issue #3603)
    • Memory view slicing generated unused error handling code which could negatively impact the C compiler optimisations for parallel OpenMP code etc. Also, it is now helped by static branch hints. (Github issue #2987)
    • Cython's built-in OpenMP functions were not translated inside of call arguments. Original patch by Celelibi and David Woods. (Github issue #3594)
    • Complex buffer item types of structs of arrays could fail to validate. Patch by Leo and smutch. (Github issue #1407)
    • Decorators were not allowed on nested async def functions. (Github issue #1462)
    • C-tuples could use invalid C struct casting. Patch by MegaIng. (Github issue #3038)
    • Optimised %d string formatting into f-strings failed on float values. (Github issue #3092)
    • Optimised aligned string formatting (%05s, %-5s) failed. (Github issue #3476)
    • When importing the old Cython build_ext integration with distutils, the additional command line arguments leaked into the regular command. Patch by Kamekameha. (Github issue #2209)
    • When using the CYTHON_NO_PYINIT_EXPORT option in C++, the module init function was not declared as extern "C". (Github issue #3414)
    • Three missing timedelta access macros were added in cpython.datetime.
    • The signature of the NumPy C-API function PyArray_SearchSorted() was fixed. Patch by Brock Mendel. (Github issue #3606)

    0.29.17 (2020-04-26)

    Features added

    • std::move() is now available from libcpp.utility. Patch by Omer Ozarslan. (Github issue #2169)
    • The @cython.binding decorator is available in Python code. (Github issue #3505)

    Bugs fixed

    • Creating an empty unicode slice with large bounds could crash. Patch by Sam Sneddon. (Github issue #3531)
    • Decoding an empty bytes/char* slice with large bounds could crash. Patch by Sam Sneddon. (Github issue #3534)
    • Re-importing a Cython extension no longer raises the error "__reduce_cython__ not found". (Github issue #3545)
    • Unused C-tuples could generate incorrect code in 0.29.16. Patch by Kirk Meyer. (Github issue #3543)
    • Creating a fused function attached it to the garbage collector before it was fully initialised, thus risking crashes in rare failure cases. Original patch by achernomorov. (Github issue #3215)
    • Temporary buffer indexing variables were not released and could show up in C compiler warnings, e.g. in generators. Patch by David Woods. (Github issues #3430, #3522)
    • The compilation cache in cython.inline("…") failed to take the language level into account. Patch by will-ca. (Github issue #3419)
    • The deprecated PyUnicode_GET_SIZE() function is no longer used in Py3.

    0.29.16 (2020-03-24)

    Bugs fixed

    • Temporary internal variables in nested prange loops could leak into other threads. Patch by Frank Schlimbach. (Github issue #3348)
    • Default arguments on fused functions could crash. Patch by David Woods. (Github issue #3370)
    • C-tuples declared in .pxd files could generate incomplete C code. Patch by Kirk Meyer. (Github issue #1427)
    • Fused functions were not always detected and optimised as Cython implemented functions. Patch by David Woods. (Github issue #3384)
    • Valid Python object concatenation of (iterable) strings to non-strings could fail with an exception. Patch by David Woods. (Github issue #3433)
    • Using C functions as temporary values lead to invalid C code. Original patch by David Woods. (Github issue #3418)
    • Fix an unhandled C++ exception in comparisons. Patch by David Woods. (Github issue #3361)
    • Fix deprecated import of "imp" module. Patch by Matti Picus. (Github issue #3350)
    • Fix compatibility with Pythran 0.9.6 and later. Patch by Serge Guelton. (Github issue #3308)
    • The _Py_PyAtExit() function in cpython.pylifecycle was misdeclared. Patch by Zackery Spytz. (Github issue #3382)
    • Several missing declarations in cpython.* were added. Patches by Zackery Spytz. (Github issue #3452, #3421, #3411, #3402)
    • A declaration for libc.math.fpclassify() was added. Patch by Zackery Spytz. (Github issue #2514)
    • Avoid "undeclared" warning about automatically generated pickle methods. Patch by David Woods. (Github issue #3353)
    • Avoid C compiler warning about unreachable code in prange().
    • Some C compiler warnings in PyPy were resolved. Patch by Matti Picus. (Github issue #3437)

    0.29.15 (2020-02-06)

    Bugs fixed

    • Crash when returning a temporary Python object from an async-def function. (Github issue #3337)
    • Crash when using **kwargs in generators. Patch by David Woods. (Github issue #3265)
    • Double reference free in __class__ cell handling for super() calls. (Github issue #3246)
    • Compile error when using *args as Python class bases. (Github issue #3338)
    • Import failure in IPython 7.11. (Github issue #3297)
    • Fixed C name collision in the auto-pickle code. Patch by ThePrez. (Github issue #3238)
    • Deprecated import failed in Python 3.9. (Github issue #3266)

    0.29.14 (2019-11-01)

    Bugs fixed

    • The generated code failed to initialise the tp_print slot in CPython 3.8. Patches by Pablo Galindo and Orivej Desh. (Github issues #3171, #3201)
    • ? for bool was missing from the supported NumPy dtypes. Patch by Max Klein. (Github issue #2675)
    • await was not allowed inside of f-strings. Patch by Dmitro Getz. (Github issue #2877)
    • Coverage analysis failed for projects where the code resides in separate source sub-directories. Patch by Antonio Valentino. (Github issue #1985)
    • An incorrect compiler warning was fixed in automatic C++ string conversions. Patch by Gerion Entrup. (Github issue #3108)
    • Error reports in the Jupyter notebook showed unhelpful stack traces. Patch by Matthew Edwards (Github issue #3196).
    • Python.h is now also included explicitly from public header files. (Github issue #3133).
    • Distutils builds with --parallel did not work when using Cython's deprecated build_ext command. Patch by Alphadelta14 (Github issue #3187).

    Other changes

    • The PyMemoryView_*() C-API is available in cpython.memoryview. Patch by Nathan Manville. (Github issue #2541)

    0.29.13 (2019-07-26)

    Bugs fixed

    • A reference leak for None was fixed when converting a memoryview to a Python object. (Github issue #3023)
    • The declaration of PyGILState_STATE in cpython.pystate was unusable. Patch by Kirill Smelkov. (Github issue #2997)

    Other changes

    • The declarations in posix.mman were extended. Patches by Kirill Smelkov. (Github issues #2893, #2894, #3012)