Extract std::libc to its own crate#13315
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These wrappers are bound to a specific libc, and they don't need to be part of libstd.
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This was quite a curious bug on windows, and the details can be found in the comment I added to src/librustc/back/link.rs
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Rebasing of #12526 with a very obscure bug fixed on windows.
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… r=alexcrichton Drop long-section-names linker workaround for windows-gnu If we can trust objdump Rust doesn't emit sections loaded at runtime longer than 8 characters on windows-gnu (but still does on linux-gnu), debug sections are not affected by that limit. I've ran tests and built few crates using exactly the same mingw-w64 version as Rusts CI just fine using **x86_64** toolchain. The motivation for this change is making LLD work (it doesn't support `--enable-long-section-names`) with this target without hacks. Bit of history: The behaviour of LD changed in Binutils 2.20 released on 2009-10-16 and `--enable-long-section-names` was added to return to the old non conformant behaviour. Looking at the comment I can only guess there was a bug fixed in newer versions. This workaround was added in rust-lang#13315 half a decade ago.
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Rebasing of #12526 with a very obscure bug fixed on windows.