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buildRustPackage: support setting test-threads

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This commit is contained in:
zowoq 2020-09-09 21:39:23 +10:00
parent a4d05ec30c
commit e4c71e6c6c
2 changed files with 16 additions and 1 deletions
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12
doc/languages-frameworks/rust.section.md
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@ -119,6 +119,18 @@ The above are just guidelines, and exceptions may be granted on a case-by-case b
However, please check if it's possible to disable a problematic subset of the
test suite and leave a comment explaining your reasoning.
#### Setting `test-threads`
`buildRustPackage` will use parallel test threads by default,
sometimes it may be necessary to disable this so the tests run consecutively.
```nix
rustPlatform.buildRustPackage {
/* ... */
cargoParallelTestThreads = false;
}
```
### Building a package in `debug` mode
By default, `buildRustPackage` will use `release` mode for builds. If a package

5
pkgs/build-support/rust/default.nix
View file

@ -30,6 +30,8 @@
, cargoVendorDir ? null
, checkType ? buildType
, depsExtraArgs ? {}
, cargoParallelTestThreads ? true
# Needed to `pushd`/`popd` into a subdir of a tarball if this subdir
# contains a Cargo.toml, but isn't part of a workspace (which is e.g. the
# case for `rustfmt`/etc from the `rust-sources).
@ -204,11 +206,12 @@ stdenv.mkDerivation ((removeAttrs args ["depsExtraArgs"]) // {
checkPhase = args.checkPhase or (let
argstr = "${stdenv.lib.optionalString (checkType == "release") "--release"} --target ${rustTarget} --frozen";
threads = if cargoParallelTestThreads then "$NIX_BUILD_CORES" else "1";
in ''
${stdenv.lib.optionalString (buildAndTestSubdir != null) "pushd ${buildAndTestSubdir}"}
runHook preCheck
echo "Running cargo test ${argstr} -- ''${checkFlags} ''${checkFlagsArray+''${checkFlagsArray[@]}}"
cargo test -j $NIX_BUILD_CORES ${argstr} -- --test-threads=$NIX_BUILD_CORES ''${checkFlags} ''${checkFlagsArray+"''${checkFlagsArray[@]}"}
cargo test -j $NIX_BUILD_CORES ${argstr} -- --test-threads=${threads} ''${checkFlags} ''${checkFlagsArray+"''${checkFlagsArray[@]}"}
runHook postCheck
${stdenv.lib.optionalString (buildAndTestSubdir != null) "popd"}
'');