On 32-bit, run tests in serial and skip those that exhaust memory

pythran.spec

@@ -49,8 +49,15 @@ BuildRequires:  python3-scipy
 
 # these packages are not included in RHEL
 %if %{undefined rhel}
+# Running tests in serial makes memory errors, which occur in some tests on
+# 32-bit architectures, more reproducible, and makes the output when they occur
+# less confusing: we tend to get individual test failures rather than a pytest
+# INTERNALERROR.
+%if 0%{?__isa_bits} != 32
 # this is used for supporting -n auto in %%pytest
 BuildRequires:  python3-pytest-xdist
+%global use_pytest_xdist 1
+%endif
 # this is only used to test integration with ipython
 BuildRequires:  /usr/bin/ipython
 %endif
@@ -123,6 +130,17 @@ k="not test_numpy_negative_binomial"
 # https://github.com/serge-sans-paille/pythran/pull/1946#issuecomment-992458379
 k="$k and not test_interp_6c"
 %endif
+%if 0%{?__isa_bits} == 32
+# These tests cause memory (address space) exhaustion; see discussion in
+# https://src.fedoraproject.org/rpms/pythran/pull-request/28.
+for t in test_fftn_{8,17,20,22} \
+    test_{h,ih,ir}fft_{8,14} \
+    test_{,i}fft_3d{,_axis,f64_axis,int64_axis} \
+    test_numpy_random_bytes1
+do
+  k="$k and not ${t}"
+done
+%endif
 %ifarch aarch64
 # the test is so flaky it makes the build fail almost all the time
 k="$k and not test_interp_8"
@@ -140,7 +158,8 @@ k="$k and not test_loadext_and_run"
 k="$k and not test_setup_bdist_install3"
 k="$k and not test_setup_build3"
 k="$k and not test_setup_sdist_install3"
-%pytest %{?!rhel:-n auto} -k "$k"
+
+%pytest %{?use_pytest_xdist:-n auto} -k "$k"
 
 
 %files -f %{pyproject_files}
@@ -156,6 +175,7 @@ k="$k and not test_setup_sdist_install3"
 %changelog
 * Thu Oct 05 2023 Benjamin A. Beasley <code@musicinmybrain.net> - 0.14.0-2
 - Fix FTBFS: skip tests that need numpy.distutils
+- On 32-bit, run tests in serial and skip those that exhaust memory
 
 * Thu Sep 07 2023 Miro Hrončok <mhroncok@redhat.com> - 0.14.0-1
 - Update to 0.14.0