compiletest/codegen-llvm: automatically add needs-target-std if needed
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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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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: