cpython

History

Felix Yan 16eea45fbd [3.8] bpo-41302: Support system libmpdec 2.5 for Python 3.8 (GH-21488) Define UNUSED only when mpdecimal.h doesn't define it. This would support building with system libmpdec 2.5 while retaining compatibility with system libmpdec 2.4 or the vendored copy. Tested to build fine with either system libmpdec or the vendored one.		2020-07-15 22:22:23 +02:00
..
libmpdec	[3.8] Revert bpo-39576: Prevent memory error for overly optimistic precisions (GH-20747)	2020-06-09 01:57:11 +02:00
tests	[3.8] Revert bpo-39576: Prevent memory error for overly optimistic precisions (GH-20747)	2020-06-09 01:57:11 +02:00
README.txt	Remove trailing whitespace.	2013-01-16 15:16:10 +01:00
_decimal.c	[3.8] bpo-41302: Support system libmpdec 2.5 for Python 3.8 (GH-21488)	2020-07-15 22:22:23 +02:00
docstrings.h	Issue #25928 : Add Decimal.as_integer_ratio(). Python parts and docs by	2015-12-28 23:02:02 +01:00

README.txt


About
=====

_decimal.c is a wrapper for the libmpdec library. libmpdec is a fast C
library for correctly-rounded arbitrary precision decimal floating point
arithmetic. It is a complete implementation of Mike Cowlishaw/IBM's
General Decimal Arithmetic Specification.


Build process for the module
============================

As usual, the build process for _decimal.so is driven by setup.py in the top
level directory. setup.py autodetects the following build configurations:

   1) x64         - 64-bit Python, x86_64 processor (AMD, Intel)

   2) uint128     - 64-bit Python, compiler provides __uint128_t (gcc)

   3) ansi64      - 64-bit Python, ANSI C

   4) ppro        - 32-bit Python, x86 CPU, PentiumPro or later

   5) ansi32      - 32-bit Python, ANSI C

   6) ansi-legacy - 32-bit Python, compiler without uint64_t

   7) universal   - Mac OS only (multi-arch)


It is possible to override autodetection by exporting:

   PYTHON_DECIMAL_WITH_MACHINE=value, where value is one of the above options.


NOTE
====

decimal.so is not built from a static libmpdec.a since doing so led to
failures on AIX (user report) and Windows (mixing static and dynamic CRTs
causes locale problems and more).