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Fix the libmpdec note for Python 3.15 in the build instructions - #1951
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Python 3.15 removed the implicit fallback to the bundled copy of libmpdec (gh-115119). Without libmpdec-dev, a default 3.15 build does not use the bundled copy: configure warns, _decimal is not built, and the decimal module uses its pure-Python implementation. The bundled copy is only used with --without-system-libmpdec, as the configure documentation for 3.15 says. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GwUvhmzgfkiZ6vo4uGyesN
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The Debian/Ubuntu note in the build instructions says that a build of Python 3.15 and older uses a bundled libmpdec when
libmpdec-devis missing. That is wrong for 3.15: it no longer falls back to the bundled copy implicitly (gh-115119). Withoutlibmpdec-dev,configurewarns,_decimalisn't built, anddecimaluses its pure-Python implementation. The bundled copy is only used with--without-system-libmpdec, as the 3.15configuredocumentation says. I saw this on GitHub's Ubuntu 3.15.2 build, which has no C_decimal.This changes the note to: 3.14 and older use the bundled copy; 3.15 uses it only with
--without-system-libmpdec; otherwise, and for 3.16 and newer,decimalfalls back to the pure-Python implementation.AI assistance (Claude Code) was used to find the cause and draft this text and the change; I checked it against the 3.15 sources and a 3.15.0 build.
🤖 Generated with Claude Code
https://claude.ai/code/session_01GwUvhmzgfkiZ6vo4uGyesN