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rust/compiler/rustc_llvm/llvm-wrapper
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Matthias Krüger b1d1e99c22
Rollup merge of #113780 - dtolnay:printkindpath, r=b-naber 
Support `--print KIND=PATH` command line syntax

As is already done for `--emit KIND=PATH` and `-L KIND=PATH`.

In the discussion of #110785, it was pointed out that `--print KIND=PATH` is nicer than trying to apply the single global `-o` path to `--print`'s output, because in general there can be multiple print requests within a single rustc invocation, and anyway `-o` would already be used for a different meaning in the case of `link-args` and `native-static-libs`.

I am interested in using `--print cfg=PATH` in Buck2. Currently Buck2 works around the lack of support for `--print KIND=PATH` by [indirecting through a Python wrapper script](d43cf3a51a/prelude/rust/tools/get_rustc_cfg.py) to redirect rustc's stdout into the location dictated by the build system.

From skimming Cargo's usages of `--print`, it definitely seems like it would benefit from `--print KIND=PATH` too. Currently it is working around the lack of this by inserting `--crate-name=___ --print=crate-name` so that it can look for a line containing `___` as a delimiter between the 2 other `--print` informations it actually cares about. This is commented as a "HACK" and "abuse". 31eda6f7c3/src/cargo/core/compiler/build_context/target_info.rs (L242) (FYI `@weihanglo` as you dealt with this recently in https://github.com/rust-lang/cargo/pull/11633.)

Mentioning reviewers active in #110785: `@fee1-dead` `@jyn514` `@bjorn3`
2023-07-21 06:52:28 +02:00
..
.editorconfig Move rustllvm into rustc_llvm 2020-09-09 23:05:43 +03:00
ArchiveWrapper.cpp Recognize AIX style archive kind 2023-04-19 11:10:47 +08:00
CoverageMappingWrapper.cpp Remove LLVMRustCoverageHashCString 2023-07-13 11:31:15 +10:00
Linker.cpp Move rustllvm into rustc_llvm 2020-09-09 23:05:43 +03:00
LLVMWrapper.h Add SafeStack support to rustc 2023-05-26 15:18:54 -04:00
PassWrapper.cpp Implement printing to file in PassWrapper 2023-07-20 11:04:31 -07:00
README Move rustllvm into rustc_llvm 2020-09-09 23:05:43 +03:00
RustWrapper.cpp address feedback from nikic and oli-obk https://github.com/rust-lang/rust/pull/113723/files 2023-07-20 16:53:06 +09:00
SymbolWrapper.cpp llvm-wrapper: update for LLVM API change 2023-07-14 12:10:29 +00:00

README 

This directory currently contains some LLVM support code. This will generally
be sent upstream to LLVM in time; for now it lives here.

NOTE: the LLVM C++ ABI is subject to between-version breakage and must *never*
be exposed to Rust. To allow for easy auditing of that, all Rust-exposed types
must be typedef-ed as "LLVMXyz", or "LLVMRustXyz" if they were defined here.

Functions that return a failure status and leave the error in
the LLVM last error should return an LLVMRustResult rather than an
int or anything to avoid confusion.

When translating enums, add a single `Other` variant as the first
one to allow for new variants to be added. It should abort when used
as an input.

All other types must not be typedef-ed as such.