cargo test -p pyproject-fmt fails on PowerPC with linking errors

[mgorny]

Honestly, I don't know what to make of this.

$ uname -a
Linux ppc32-testing 6.1.60-gentoo-dist-hardened #1 SMP Fri Dec  1 22:10:49 UTC 2023 ppc POWER9 (architected), altivec supported CHRP IBM pSeries (emulated by qemu) GNU/Linux
$ git rev-parse HEAD
01f098973225bfe394bf00d801bc1d6b3115b6b8
$ cargo --version
cargo 1.82.0 (8f40fc59f 2024-08-21)
$ python --version
Python 3.12.7
$ cargo test -p common
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.11s
     Running unittests src/lib.rs (target/debug/deps/common-c9a272beab265181)

running 18 tests
test tests::array_tests::test_normalize_requirement::case_2_strip_micro_keep ... ok
test tests::array_tests::test_normalize_requirement::case_1_strip_micro_no_keep ... ok
test tests::array_tests::test_normalize_requirement::case_4_ignore_non_string ... ok
test tests::array_tests::test_normalize_requirement::case_3_no_change ... ok
test tests::array_tests::test_order_array::case_1_empty ... ok
test tests::array_tests::test_normalize_requirement::case_5_has_double_quote ... ok
test tests::array_tests::test_order_array::case_2_single ... ok
test tests::array_tests::test_order_array::case_4_newline_single_comment ... ok
test tests::array_tests::test_order_array::case_5_double ... ok
test tests::pep508_tests::test_format_requirement::case_1_strip_version ... ok
test tests::pep508_tests::test_format_requirement::case_3_do_not_strip_tilda ... ok
test tests::array_tests::test_reorder_no_trailing_comma::case_1_reorder_no_trailing_comma ... ok
test tests::pep508_tests::test_format_requirement::case_2_keep_version ... ok
test tests::array_tests::test_order_array::case_3_newline_single ... ok
test tests::pep508_tests::test_get_canonic_requirement_name::case_1_lowercase ... ok
test tests::pep508_tests::test_get_canonic_requirement_name::case_2_replace_dot_with_dash ... ok
test tests::array_tests::test_order_array::case_6_increasing ... ok
test tests::pep508_tests::test_format_requirement::case_4_url ... ok

test result: ok. 18 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s

   Doc-tests common

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
$ cargo test -p pyproject-fmt 
   Compiling pyproject-fmt v2.5.0 (/home/mgorny/toml-fmt/pyproject-fmt)
error: linking with `cc` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH="/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/bin:/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/bin:/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/opt/bin" VSLANG="1033" "cc" "-m32" "/tmp/rustc2FjwHp/symbols.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.0024z31hq9gqljp4k5e1bmims.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.02ju393wghzwyglansjy4cwf1.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.04x52a3juphnfn6fry338d7zd.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.04xvcl76d8o3jgazj04jexldb.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.0b047k45k9dol4dctu2v01a9o.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.0dlv2iom951zik2r4c7kand8z.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.0eh4hxbhff92mi0aiajl3c8do.rcgu.o" 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"/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.ceycgjmvft5k08pvjuwuhkmjp.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.chsbxfk778ay049ch87h4cb40.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.cku5gr1zbxoib6ydfcu47w3ai.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.ctbe4pn7klhwx97fxx6tdzsyt.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.cuq204g7k3klimlznhtwugknm.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.d4mjuq2d8c7qijxht89rgrk7d.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.d6pvgglssp96goyna8obl0ls0.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.dcn1dkx8g1gggnlayrtyow865.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.dkddifs92m66qg78so117tq0g.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.dmw4rv9oh72us38r1pqdwg6os.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.do6gwomtoh80x0cg59gf9ryuw.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.dq286htmmpe0kl51r2yajt4ux.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.dso2t7bkf3lw99t0j57z0dacx.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.dt95dfkdst69q3n1bvekiiaoy.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.dvjx01ja55l7t9pyxsr80fb0r.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.e1dgb7hwifolj7yl4dzt6h15g.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.e4lx40ftil1g7ws8rmcnddoo5.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.eaunyl966jg0577qvum5omolx.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.epgp6cckjdba149ron1gw949o.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.esoswtpkmyn5bkjdkpvtcmevt.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.ewop5pyubw7hsb4j6f6ngzw39.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.eyvp7n6nefidp66sxrg9p5el6.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.ezmvfml9k8t34pjocexf349vj.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.f1b3kevyrboegef7qxci04flh.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.f2mmc4pa4ysryuxkt4dezasgh.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.f2o0zhd2kp6omh63oyehqqh4m.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.f4bjqxwfxy3nd8dqgkdjdh8cw.rcgu.o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.ekce17kqwmhxwlac0r1pw892q.rcgu.o" "-Wl,--as-needed" "-Wl,-Bstatic" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libtest-b3bbbe4c100bc2d9.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libgetopts-304fc4d1d6eb2f84.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libunicode_width-5d5ed60b3e551b68.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/librustc_std_workspace_std-03ce40875f84a3a8.rlib" "/home/mgorny/toml-fmt/target/debug/deps/librstest-f88a874192c7b054.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libfutures_timer-2d8d2a6c10ca4965.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libfutures-07421c7c4c2435e1.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libfutures_executor-9562df14c36925c7.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libfutures_util-e9e2f8dec1baaa91.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libfutures_io-6a7b1b5b876aecd4.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libslab-a6d208d09189e8e6.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libfutures_channel-cb4ee675e0997638.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libfutures_sink-40684e43fc7f62cd.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libfutures_task-70c5146d98217cd4.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libpin_utils-04444e5444605822.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libfutures_core-13fa3d4a8b2c85ab.rlib" "/home/mgorny/toml-fmt/target/debug/deps/liblexical_sort-fea71b660376f1cc.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libany_ascii-fd35d1d777718ffd.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libpyo3-d4c1d281d7693850.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libmemoffset-f95a17a93e647e77.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libpyo3_ffi-9135a91b7ecb43f8.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libunindent-b339d77cfeb6fcf7.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libcommon-d01c85f6a100b6c4.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libpep508_rs-7dc02ec5bb2f63b0.rlib" "/home/mgorny/toml-fmt/target/debug/deps/liburlencoding-11a1f11d00c2b2ef.rlib" "/home/mgorny/toml-fmt/target/debug/deps/liburl-b151adc34b0d9f99.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libidna-9b56a78d66fc3e27.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libunicode_normalization-1a910976de8a8f50.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libtinyvec-ebe7e46d992058b5.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libtinyvec_macros-df42c7bda644fb23.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libunicode_bidi-71821274968e3231.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libform_urlencoded-52594c20904c833d.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libpercent_encoding-91bcca1e920c6f77.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libregex-ce47197419746b9f.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libpep440_rs-1a2bb2e5280872d0.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libunscanny-b33eea79a139fa17.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libunicode_width-5a8d23c19b553687.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libtaplo-a91230155273e2c7.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libahash-da9d5e2d3d5a7388.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libgetrandom-8f4e3bcd7f20c415.rlib" "/home/mgorny/toml-fmt/target/debug/deps/liblibc-1c076573afa1ffae.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libcfg_if-fd471b523dd0f950.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libzerocopy-762ec818f1f886ba.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libglobset-f32f6346b1b247e6.rlib" "/home/mgorny/toml-fmt/target/debug/deps/liblog-9ee29fed4d5c0de1.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libregex_automata-b580b72252612dbb.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libregex_syntax-92180693acaf8b35.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libbstr-371c4f7bf1f7de3e.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libaho_corasick-989da6a246e03034.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libmemchr-f4197ae936d3d48f.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libtracing-863d57d2eac72d87.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libpin_project_lite-8ff5a8d13fbe5955.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libtracing_core-62d4431d88805257.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libarc_swap-db5c9dba66ce0798.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libitertools-c99267b75e872b13.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libtime-a7e777c5d7044a5d.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libitoa-c95aaab88b1361bf.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libtime_core-ab3d44b3122cd8b2.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libnum_conv-2dd85c586f698754.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libderanged-fa2c7943f5de0e62.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libpowerfmt-ac49f1b12091513f.rlib" "/home/mgorny/toml-fmt/target/debug/deps/librowan-40e61b5c01eba0c2.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libtext_size-791b8fcdb963612d.rlib" "/home/mgorny/toml-fmt/target/debug/deps/librustc_hash-437871eb81b520a5.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libhashbrown-d56826999d395d77.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libcountme-f8bdd621bd09a475.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libonce_cell-c22971bd60850a9d.rlib" "/home/mgorny/toml-fmt/target/debug/deps/liblogos-cbfaab1e321ae833.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libthiserror-dffdf9c5a456bcd6.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libeither-16761ccd947028c6.rlib" "/home/mgorny/toml-fmt/target/debug/deps/libserde-dfbcba69c02a3f9b.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libstd-fa29e90d1be71724.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libpanic_unwind-c3e3a6f99c1fa0d8.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libobject-29494c8f37580d01.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libmemchr-527992e40fa99d2e.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libaddr2line-d8f75f56f78be55c.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libgimli-99594de865c780ad.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/librustc_demangle-30df8e4b82ef5ba3.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libstd_detect-39123d87d51332a8.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libhashbrown-9f581fe76e52229c.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/librustc_std_workspace_alloc-86760c7283ecd95b.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libminiz_oxide-136cc93626b768f4.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libadler-524b58ea187acedb.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libunwind-1be2b81c9556c8ac.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libcfg_if-1fc871ca362c2b1a.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/liblibc-c247b329acc74a9e.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/liballoc-9187c0c6053916fa.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/librustc_std_workspace_core-73b25e83e12ad807.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libcore-c4d2b508846c2f20.rlib" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib/libcompiler_builtins-f73103a9e313087d.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/opt/rust-bin-1.82.0/lib/rustlib/powerpc-unknown-linux-gnu/lib" "-o" "/home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
  = note: /usr/lib/gcc/powerpc-unknown-linux-gnu/14/../../../../powerpc-unknown-linux-gnu/bin/ld: bss-plt forced due to /home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.04x52a3juphnfn6fry338d7zd.rcgu.o
          /usr/lib/gcc/powerpc-unknown-linux-gnu/14/../../../../powerpc-unknown-linux-gnu/bin/ld: /home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.0mp3z3clhhtbj3awx09j38nhf.rcgu.o: in function `pyo3_ffi::object::Py_DECREF':
          /home/mgorny/.cargo/registry/src/index.crates.io-9850fa1df3136423/pyo3-ffi-0.22.5/src/object.rs:578:(.text._ZN72_$LT$pyo3..instance..Bound$LT$T$GT$$u20$as$u20$core..ops..drop..Drop$GT$4drop17heba6ef691f20f3bdE+0x18): undefined reference to `Py_DecRef'
          /usr/lib/gcc/powerpc-unknown-linux-gnu/14/../../../../powerpc-unknown-linux-gnu/bin/ld: /home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.2dn2wqod56dlghivpnd981atb.rcgu.o:(.got2+0x0): undefined reference to `PyBaseObject_Type'
          /usr/lib/gcc/powerpc-unknown-linux-gnu/14/../../../../powerpc-unknown-linux-gnu/bin/ld: /home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.48i27l19c60qep2andhszywkb.rcgu.o: in function `pyo3::err::PyErr::write_unraisable_bound':
          /home/mgorny/.cargo/registry/src/index.crates.io-9850fa1df3136423/pyo3-0.22.5/src/err/mod.rs:709:(.text._ZN4pyo33err5PyErr22write_unraisable_bound17he4d36a045297b063E+0x2c): undefined reference to `PyErr_WriteUnraisable'
          /usr/lib/gcc/powerpc-unknown-linux-gnu/14/../../../../powerpc-unknown-linux-gnu/bin/ld: /home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.6w2h5ije6sgvcbck84gqm4rvm.rcgu.o: in function `<pyo3::internal::get_slot::Slot<_> as pyo3::internal::get_slot::GetSlotImpl>::get_slot':
          /home/mgorny/.cargo/registry/src/index.crates.io-9850fa1df3136423/pyo3-0.22.5/src/internal/get_slot.rs:115:(.text._ZN97_$LT$pyo3..internal..get_slot..Slot$LT$_$GT$$u20$as$u20$pyo3..internal..get_slot..GetSlotImpl$GT$8get_slot17h989998c98d71cebaE+0x5c): undefined reference to `PyType_GetSlot'
          /usr/lib/gcc/powerpc-unknown-linux-gnu/14/../../../../powerpc-unknown-linux-gnu/bin/ld: /home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.6wx0te2vknc8t1fe45rwehuda.rcgu.o:(.got2+0x0): undefined reference to `_Py_TrueStruct'
          /usr/lib/gcc/powerpc-unknown-linux-gnu/14/../../../../powerpc-unknown-linux-gnu/bin/ld: /home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.6wx0te2vknc8t1fe45rwehuda.rcgu.o:(.got2+0x4): undefined reference to `_Py_FalseStruct'
          /usr/lib/gcc/powerpc-unknown-linux-gnu/14/../../../../powerpc-unknown-linux-gnu/bin/ld: /home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.7gezn6qbmqnwkdubw8gz101lj.rcgu.o:(.got2+0x0): undefined reference to `PyBaseObject_Type'
          /usr/lib/gcc/powerpc-unknown-linux-gnu/14/../../../../powerpc-unknown-linux-gnu/bin/ld: /home/mgorny/toml-fmt/target/debug/deps/_lib-87ce8d8c02ed3199.9hluxc7y6w5apnwni6t80f9m0.rcgu.o: in function `pyo3::conversions::std::num::<impl pyo3::conversion::IntoPy<pyo3::instance::Py<pyo3::types::any::PyAny>> for u64>::into_py':
          /home/mgorny/.cargo/registry/src/index.crates.io-9850fa1df3136423/pyo3-0.22.5/src/conversions/std/num.rs:85:(.text._ZN4pyo311conversions3std3num115_$LT$impl$u20$pyo3..conversion..IntoPy$LT$pyo3..instance..Py$LT$pyo3..types..any..PyAny$GT$$GT$$u20$for$u20$u64$GT$7into_py17hca3c5fc3ad88cdeeE+0x2c): undefined reference to `PyLong_FromUnsignedLongLong'
[…]

Full output from the second cargo test call (80 KiB): full-output.txt

The same tests pass on all other architectures I've tried. I'm filing a bug here since this is the package I'm seeing it with. CC @davidhewitt from PyO3.

[mgorny]

Okay, apparently it is caused by:

default = ["extension-module"]

FWICS it causes PyO3 to assume it's compiling a Python extension and therefore not link to libpython*.so explicitly — which means the Python symbols PyO3 is trying to use doesn't get resolved.

The true mystery is why it doesn't fail on amd64. My educated guess is that some optimization pass removes all Python library calls there, while they still do happen on PPC.

[davidhewitt]

Thanks for the ping - yes, the extension-module feature is a longstanding pain because while it makes for technically correct extension module builds it breaks all executables and tests as part of the same project. I have an idea for an alternative which would be much more user friendly which I hope I might land in the next version of PyO3.

As for why the link failures are architecture specific, that's a surprise to me too. Possibly some cargo config which overrides the linking?

[mgorny]

As for why the link failures are architecture specific, that's a surprise to me too. Possibly some cargo config which overrides the linking?

If you're referring to project-specific or system-specific config, then no. The project is as simple as it gets, and the system is pretty much vanilla. If anything, it would have to be something upstream in the Rust distribution itself.