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).
24cb7de15d