boehmgc: explain+refine test-disablement on darwin#199980
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Commit 172f9cf disabled the checks for boehmgc on darwin-x86_64 with the comment "`gctest` fails under emulation on aarch64-darwin". Presumably this is because the test does not work under Apple's Rosetta binary translator, which is used to execute x86_64 binaries on aarch64 hosts. The `check` phase would only use this translator if a narrower condition is met: ``` stdenv.isDarwin && stdenv.buildPlatform.isAarch64 && stdenv.hostPlatform.isx86_64 ``` Let's use that condition instead, mainly as documentation so people don't think that the boehm-gc test suite is unreliable (this happened already in #198591). The boehm-gc test suite is actually quite good, and it is extremely important to run the tests for this particular package because of the number of advanced conservative-collector techniques it uses. Malfunctions here can cause use-after-`free()` bugs that don't correspond to any particular invocation of `free()` the way they would in a C/C++ program. They are incredibly difficult to track down.
Member
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No, that won't work. The rosetta builds don't trigger |
Member
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If you want a narrower approach, disabling just the single test might be relatively easy. |
Author
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@vcunat I completely forgot that, as staging captain, your pre-release crunch period starts a month earlier. This can absolutely wait until after 22.11. PS, thanks for explaining how Rosetta is used in nixpkgs; that totally makes sense. |
Member
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It's not really in nixpkgs... but on Hydra, as x86 Apple HW would be less cost-effective. |
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Description of changes
Commit 172f9cf disabled the checks for boehmgc on darwin-x86_64 with the comment "
gctestfails under emulation on aarch64-darwin".Presumably this is because the test does not work under Apple's Rosetta binary translator, which is used to execute x86_64 binaries on aarch64 hosts. The
checkphase would only use this translator if a narrower condition is met:Let's use that condition instead, mainly as documentation so people don't think that the boehm-gc test suite is unreliable (this happened already in #198591). The boehm-gc test suite is actually quite good, and it is extremely important to run the tests for this particular package because of the number of advanced conservative-collector techniques it uses. Malfunctions here can cause use-after-
free()bugs that don't correspond to any particular invocation offree()the way they would in a C/C++ program. They are incredibly difficult to track down.CC: @zowoq @vcunat
#191339 (comment)
Things done
sandbox = trueset innix.conf? (See Nix manual)nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage./result/bin/)nixos/doc/manual/md-to-db.shto update generated release notes