compiletest/codegen-llvm: automatically add needs-target-std if needed
#150672
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When running the codegen-llvm test suite, the "needs-target-std" directive is automatically added if and only if the "#![no_std]" line is not seen and the "needs-target-std" directive was not already seen. This is a best-effort utility to make running the codegen-llvm test suite for targets that do not support std slightly easier.
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…=Zalathar compiletest: add implied `needs-target-std` for `codegen` mode tests unless annotated with `#![no_std]`/`#![no_core]` A `codegen` mode test (such as `codegen-llvm` test suite) will now by default have an implied `//@ needs-target-std` directive, *unless* the test explicitly has an `#![no_std]`/`#![no_core]` attribute which disables this behavior. - When a test has both `#![no_std]`/`#![no_core]` and `//@ needs-target-std`, the explicit `//@ needs-target-std` directive will cause the test to be ignored for targets that do not support std still. This is to make it easier to test out-of-tree targets / custom targets (and targets not tested in r-l/r CI) without requiring target maintainers to do a bunch of manual `//@ needs-target-std` busywork. Context: [#t-compiler/help > &rust-lang#96;compiletest&rust-lang#96; cannot find &rust-lang#96;core&rust-lang#96; library for target != host](https://rust-lang.zulipchat.com/#narrow/channel/182449-t-compiler.2Fhelp/topic/.60compiletest.60.20cannot.20find.20.60core.60.20library.20for.20target.20!.3D.20host/with/568652419) ## Implementation remarks This is an alternative version of rust-lang#150672, with some differences: - *This* PR applies this implied-`needs-target-std` behavior to all `codegen` test mode tests. - *This* PR does the synthetic directive injection in the same place as implied-`codegen-run` directives. Both are of course hacks, but at least they're together next to each other.
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Rollup merge of #151294 - jieyouxu:infer-needs-target-std, r=Zalathar compiletest: add implied `needs-target-std` for `codegen` mode tests unless annotated with `#![no_std]`/`#![no_core]` A `codegen` mode test (such as `codegen-llvm` test suite) will now by default have an implied `//@ needs-target-std` directive, *unless* the test explicitly has an `#![no_std]`/`#![no_core]` attribute which disables this behavior. - When a test has both `#![no_std]`/`#![no_core]` and `//@ needs-target-std`, the explicit `//@ needs-target-std` directive will cause the test to be ignored for targets that do not support std still. This is to make it easier to test out-of-tree targets / custom targets (and targets not tested in r-l/r CI) without requiring target maintainers to do a bunch of manual `//@ needs-target-std` busywork. Context: [#t-compiler/help > `compiletest` cannot find `core` library for target != host](https://rust-lang.zulipchat.com/#narrow/channel/182449-t-compiler.2Fhelp/topic/.60compiletest.60.20cannot.20find.20.60core.60.20library.20for.20target.20!.3D.20host/with/568652419) ## Implementation remarks This is an alternative version of #150672, with some differences: - *This* PR applies this implied-`needs-target-std` behavior to all `codegen` test mode tests. - *This* PR does the synthetic directive injection in the same place as implied-`codegen-run` directives. Both are of course hacks, but at least they're together next to each other.
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☔ The latest upstream changes (presumably #151667) made this pull request unmergeable. Please resolve the merge conflicts. |
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compiletest: add implied `needs-target-std` for `codegen` mode tests unless annotated with `#![no_std]`/`#![no_core]` A `codegen` mode test (such as `codegen-llvm` test suite) will now by default have an implied `//@ needs-target-std` directive, *unless* the test explicitly has an `#![no_std]`/`#![no_core]` attribute which disables this behavior. - When a test has both `#![no_std]`/`#![no_core]` and `//@ needs-target-std`, the explicit `//@ needs-target-std` directive will cause the test to be ignored for targets that do not support std still. This is to make it easier to test out-of-tree targets / custom targets (and targets not tested in r-l/r CI) without requiring target maintainers to do a bunch of manual `//@ needs-target-std` busywork. Context: [#t-compiler/help > `compiletest` cannot find `core` library for target != host](https://rust-lang.zulipchat.com/#narrow/channel/182449-t-compiler.2Fhelp/topic/.60compiletest.60.20cannot.20find.20.60core.60.20library.20for.20target.20!.3D.20host/with/568652419) ## Implementation remarks This is an alternative version of rust-lang/rust#150672, with some differences: - *This* PR applies this implied-`needs-target-std` behavior to all `codegen` test mode tests. - *This* PR does the synthetic directive injection in the same place as implied-`codegen-run` directives. Both are of course hacks, but at least they're together next to each other.
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When running the codegen-llvm test suite, the
needs-target-stddirective is automatically added if and only if the#![no_std]line is not seen and theneeds-target-stddirective was not already seen.This is a best-effort help to make running the codegen-llvm test suite for targets that do not support std slightly easier. Ideally, with time, the tests that aren't marked as no_std but in fact only use types from core/alloc will be patched to reflect this, so that they can be reused for targets without std.
For an explanation of this patch instead of a patch that marks all the tests that aren't
#![no_std]withneeds-target-std, see this Zulip thread. Let me know if, instead, a patch adding theneeds-target-stdis preferred.A simple test of the introduced behaviour is
./x test tests/codegen-llvm/align-fn.rs --target=riscv32e-unknown-none-elf --force-rerun -v. The test does not have theneeds-target-stddirective, but it is ignored with this message: