mirror of https://github.com/python/cpython
47 lines
1.2 KiB
Plaintext
47 lines
1.2 KiB
Plaintext
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About
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=====
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_decimal.c is a wrapper for the libmpdec library. libmpdec is a fast C
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library for correctly-rounded arbitrary precision decimal floating point
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arithmetic. It is a complete implementation of Mike Cowlishaw/IBM's
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General Decimal Arithmetic Specification.
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Build process for the module
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============================
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As usual, the build process for _decimal.so is driven by setup.py in the top
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level directory. setup.py autodetects the following build configurations:
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1) x64 - 64-bit Python, x86_64 processor (AMD, Intel)
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2) uint128 - 64-bit Python, compiler provides __uint128_t (gcc)
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3) ansi64 - 64-bit Python, ANSI C
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4) ppro - 32-bit Python, x86 CPU, PentiumPro or later
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5) ansi32 - 32-bit Python, ANSI C
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6) ansi-legacy - 32-bit Python, compiler without uint64_t
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7) universal - Mac OS only (multi-arch)
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It is possible to override autodetection by exporting:
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PYTHON_DECIMAL_WITH_MACHINE=value, where value is one of the above options.
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NOTE
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====
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decimal.so is not built from a static libmpdec.a since doing so led to
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failures on AIX (user report) and Windows (mixing static and dynamic CRTs
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causes locale problems and more).
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