Work around an apparent inflooping bug in MPFR on 32-bit systems.

python-gmpy2-factorial-32bit.patch

@@ -0,0 +1,11 @@
+--- a/test/test_gmpy2_math.txt
++++ b/test/test_gmpy2_math.txt
+@@ -233,8 +233,6 @@ TypeError: factorial() requires non-nega
+ mpfr('1.2146304367025329e+205')
+ >>> gmpy2.factorial(123456)
+ mpfr('2.6040699049291379e+574964')
+->>> gmpy2.factorial(123456789)
+-mpfr('inf')
+ >>> gmpy2.factorial(1234567899999999999999)
+ Traceback (most recent call last):
+   File "<stdin>", line 1, in <module>

python-gmpy2.spec

@@ -9,6 +9,8 @@ Summary:        Python interface to GMP, MPFR, and MPC
 License:        LGPLv3+
 URL:            https://pypi.python.org/pypi/gmpy2
 Source0:        https://github.com/aleaxit/gmpy/archive/%{srcname}-%{version}%{?prerelease}.tar.gz
+# Work around an apparent inflooping bug in MPFR on 32-bit systems
+Patch0:         %{name}-factorial-32bit.patch
 
 BuildRequires:  gcc
 BuildRequires:  gmp-devel
@@ -42,7 +44,10 @@ Provides:       bundled(jquery)
 %{common_desc}
 
 %prep
-%autosetup -n gmpy-%{srcname}-%{version}%{?prerelease}
+%autosetup -N -n gmpy-%{srcname}-%{version}%{?prerelease}
+%if 0%{__isa_bits} == 32
+%patch0 -p1
+%endif
 
 # Update the sphinx theme name
 sed -i "s/'default'/'classic'/" docs/conf.py