[Bug rust/124233] [16 Regression] MinGW-w64 gcc/rust build issues due to missing open_memstream() since r16-2986

[cohenarthur at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124233

Arthur Cohen <cohenarthur at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |cohenarthur at gcc dot gnu.org

--- Comment #8 from Arthur Cohen <cohenarthur at gcc dot gnu.org> ---
Hi Brecht,

The core library should be supported by the end of the summer, around
September. You can check in our testsuite for instances of `printf` as you can
bind to libc functions and use that for prints/debug prints. Furthermore, the
`println!` macro is only available in `std`, which `core` is a subset of -
support for `std` is not yet on the cards as we are focusing on other
milestones for now.

Regarding the patch (thank you Andrew!) I'll try and get it integrated shortly.

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