[New-bugs-announce] [issue41302] _decimal failed to build with system libmpdec 2.5

[Felix Yan]

New submission from Felix Yan <felixonmars at archlinux.org>:

In bpo-40874, mpdecimal.h in the vendored libmpdec has defines of UNUSED while the standalone released version of mpdecimal 2.5.0 doesn't. This breaks _decimal module build with system libmpdec due to UNUSED is undefined.

Errors are like:

cpython/Modules/_decimal/_decimal.c:277:36: error: expected ‘;’, ‘,’ or ‘)’ before ‘UNUSED’
  277 | dec_traphandler(mpd_context_t *ctx UNUSED) /* GCOV_NOT_REACHED */
      |                                    ^~~~~~

Reproducible in both 3.8 branch and master (didn't test 3.9, but should be affected too).

----------
components: Extension Modules
messages: 373676
nosy: felixonmars, skrah
priority: normal
severity: normal
status: open
title: _decimal failed to build with system libmpdec 2.5
type: compile error
versions: Python 3.10, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41302>
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