Hi!

On 2022-12-13T14:40:36+0100, Arthur Cohen <arthur.cohen@embecosm.com> wrote:
> We've also added one more commit, which only affects files inside the
> Rust front-end folder. This commit adds an experimental flag, which
> blocks the compilation of Rust code when not used.

(That's commit r13-4675-gb07ef39ffbf4e77a586605019c64e2e070915ac3
"gccrs: Add fatal_error when experimental flag is not present".)

I noticed that GCC/Rust recently lost all LTO variants in torture
testing -- due to this commit.  :-O

OK to push the attached
"Make '-frust-incomplete-and-experimental-compiler-do-not-use' a 'Common' option",
or should this be done differently?

With that, we get back:

     PASS: rust/compile/torture/all_doc_comment_line_blocks.rs   -O0  (test for excess errors)
     PASS: rust/compile/torture/all_doc_comment_line_blocks.rs   -O1  (test for excess errors)
     PASS: rust/compile/torture/all_doc_comment_line_blocks.rs   -O2  (test for excess errors)
    +PASS: rust/compile/torture/all_doc_comment_line_blocks.rs   -O2 -flto -fno-use-linker-plugin -flto-partition=none  (test for excess errors)
    +PASS: rust/compile/torture/all_doc_comment_line_blocks.rs   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  (test for excess errors)
     PASS: rust/compile/torture/all_doc_comment_line_blocks.rs   -O3 -g  (test for excess errors)
     PASS: rust/compile/torture/all_doc_comment_line_blocks.rs   -Os  (test for excess errors)

Etc., and in total:

                    === rust Summary for unix ===

    # of expected passes            [-4990-]{+6718+}
    # of expected failures          [-39-]{+51+}


Grüße
 Thomas


> We hope this helps
> indicate to users that the compiler is not yet ready, but can still be
> experimented with :)
>
> We plan on removing that flag as soon as possible, but in the meantime,
> we think it will help not creating divide within the Rust ecosystem, as
> well as not waste Rust crate maintainers' time.


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