dev-python/mpmath: Backport upstream fix for gmpy2 test failures

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/mpmath/files/mpmath-1.4.0_alpha5-valueerror.patch

@@ -0,0 +1,50 @@
+From 9ad6a13925922711ca004686194daf8f110feaea Mon Sep 17 00:00:00 2001
+From: Sergey B Kirpichev <skirpichev@gmail.com>
+Date: Mon, 9 Jun 2025 05:07:00 +0300
+Subject: [PATCH] Fix from_man_exp to correctly reject non-integral mantissa
+
+This partially reverts 25506567
+---
+ mpmath/ctx_mp_python.py        | 2 +-
+ mpmath/libmp/libmpf.py         | 7 +++++--
+ mpmath/tests/test_basic_ops.py | 5 +++++
+ 3 files changed, 11 insertions(+), 3 deletions(-)
+
+diff --git a/mpmath/ctx_mp_python.py b/mpmath/ctx_mp_python.py
+index d9e9f64f..72b81278 100644
+--- a/mpmath/ctx_mp_python.py
++++ b/mpmath/ctx_mp_python.py
+@@ -64,7 +64,7 @@ def __new__(cls, val=fzero, **kwargs):
+             if len(val) == 4:
+                 val = val[0], MPZ(val[1]), *val[2:]
+             elif len(val) == 2:
+-                v._mpf_ = from_man_exp(MPZ(val[0]), val[1], prec, rounding)
++                v._mpf_ = from_man_exp(val[0], val[1], prec, rounding)
+                 return v
+             else:
+                 raise ValueError
+diff --git a/mpmath/libmp/libmpf.py b/mpmath/libmp/libmpf.py
+index af61879e..266ee394 100644
+--- a/mpmath/libmp/libmpf.py
++++ b/mpmath/libmp/libmpf.py
+@@ -8,7 +8,7 @@
+ import sys
+ import warnings
+ 
+-from .backend import BACKEND, MPZ, MPZ_FIVE, MPZ_ONE, MPZ_ZERO, gmpy
++from .backend import BACKEND, MPZ, MPZ_FIVE, MPZ_ONE, MPZ_ZERO, gmpy, int_types
+ from .libintmath import (bctable, bin_to_radix, isqrt, numeral, sqrtrem,
+                          stddigits, trailtable)
+ 
+@@ -204,7 +204,10 @@ def normalize(sign, man, exp, bc, prec, rnd):
+ def from_man_exp(man, exp, prec=0, rnd=round_fast):
+     """Create raw mpf from (man, exp) pair. The mantissa may be signed.
+     If no precision is specified, the mantissa is stored exactly."""
+-    man = MPZ(man)
++    if isinstance(man, int_types):
++        man = MPZ(man)
++    else:
++        raise TypeError("man expected to be an integer")
+     sign = 0
+     if man < 0:
+         sign = 1

dev-python/mpmath/mpmath-1.4.0_alpha5-r1.ebuild

@@ -0,0 +1,64 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DISTUTILS_USE_PEP517=setuptools
+PYTHON_COMPAT=( pypy3 pypy3_11 python3_{10..13} )
+
+inherit distutils-r1 optfeature pypi
+
+DESCRIPTION="Python library for arbitrary-precision floating-point arithmetic"
+HOMEPAGE="
+	https://mpmath.org/
+	https://github.com/mpmath/mpmath/
+	https://pypi.org/project/mpmath/
+"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="~amd64 ~arm ~arm64 ~hppa ~loong ~mips ~ppc ~ppc64 ~riscv ~sparc ~x86 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos"
+IUSE="test-full"
+
+BDEPEND="
+	dev-python/setuptools-scm[${PYTHON_USEDEP}]
+	test? (
+		dev-python/hypothesis[${PYTHON_USEDEP}]
+		dev-python/numpy[${PYTHON_USEDEP}]
+		dev-python/packaging[${PYTHON_USEDEP}]
+		dev-python/pexpect[${PYTHON_USEDEP}]
+		dev-python/pytest-rerunfailures[${PYTHON_USEDEP}]
+		dev-python/pytest-timeout[${PYTHON_USEDEP}]
+		$(python_gen_cond_dep '
+			dev-python/gmpy2[${PYTHON_USEDEP}]
+		' 'python3*')
+		test-full? (
+			dev-python/matplotlib[${PYTHON_USEDEP}]
+		)
+	)
+"
+
+EPYTEST_XDIST=1
+distutils_enable_tests pytest
+
+PATCHES=(
+	# https://github.com/aleaxit/gmpy/pull/566
+	# https://github.com/mpmath/mpmath/pull/969/commits/9ad6a13925922711ca004686194daf8f110feaea
+	"${FILESDIR}/${P}-valueerror.patch"
+)
+
+python_test() {
+	local EPYTEST_DESELECT=()
+
+	# CLI crashes otherwise, sigh (not a regression)
+	# https://github.com/mpmath/mpmath/issues/907
+	> "${HOME}/.python_history" || die
+
+	local -x PYTEST_DISABLE_PLUGIN_AUTOLOAD=1
+	epytest -p rerunfailures --reruns=5 -p timeout
+}
+
+pkg_postinst() {
+	optfeature "gmp support" dev-python/gmpy2
+	optfeature "matplotlib support" dev-python/matplotlib
+}