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Write text output files to stdout if options like -o - or --emit asm=- are provided #431
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T-compilerAdd this label so rfcbot knows to poll the compiler teamAdd this label so rfcbot knows to poll the compiler teamdisposition-mergeThe FCP starter wants to merge thisThe FCP starter wants to merge thisfinished-final-comment-periodThe FCP has finished, action upon the disposition label needs to be takenThe FCP has finished, action upon the disposition label needs to be takenmajor-changeA proposal to make a major change to rustcA proposal to make a major change to rustcmajor-change-acceptedA major change proposal that was acceptedA major change proposal that was accepted
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T-compilerAdd this label so rfcbot knows to poll the compiler teamAdd this label so rfcbot knows to poll the compiler teamdisposition-mergeThe FCP starter wants to merge thisThe FCP starter wants to merge thisfinished-final-comment-periodThe FCP has finished, action upon the disposition label needs to be takenThe FCP has finished, action upon the disposition label needs to be takenmajor-changeA proposal to make a major change to rustcA proposal to make a major change to rustcmajor-change-acceptedA major change proposal that was acceptedA major change proposal that was accepted
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Proposal
Currently, rustc writes output to files, even if options like
-o -or--emit asm=-are specified. But sometimes it would be convenient if rustc writes text output (asm,dep-info,llvm-irandmir) to stdout if the user explicitly asks for it, so that the output could be easily read or piped to consumer programs. For example I could write a simple name demangler and pipe the assembly output to it to make a poor man's command-line compiler explorer.There are a few open issues where people proposed the same thing, like rust-lang/rust#47112 and rust-lang/rust#26719.
For gcc and clang, when
-o -is provided, assembly output (produced via-S) will be written to stdout instead of a<source_file_name>.sfile. Dependency information (produced via-MD) will still be written to a file called-.d. Preprocessor output (produced via-E) will always be written to stdout.Mentors or Reviewers
I'm not sure who to include here.
Process
The main points of the Major Change Process are as follows:
@rustbot second.-C flag, then full team check-off is required.@rfcbot fcp mergeon either the MCP or the PR.You can read more about Major Change Proposals on forge.
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This issue is not meant to be used for technical discussion. There is a Zulip stream for that. Use this issue to leave procedural comments, such as volunteering to review, indicating that you second the proposal (or third, etc), or raising a concern that you would like to be addressed.