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---
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title: Release 0.42
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short-description: Release notes for 0.42 (preliminary)
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...
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**Preliminary, 0.42.0 has not been released yet.**
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# New features
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## Distribution tarballs from Mercurial repositories
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Creating distribution tarballs can now be made out of projects based on
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Mercurial. As before, this remains possible only with the Ninja backend.
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## Keyword argument verification
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Meson will now check the keyword arguments used when calling any function
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and print a warning if any of the keyword arguments is not known. In the
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future this will become a hard error.
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## Add support for Genie to Vala compiler
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The Vala compiler has an alternative syntax, Genie, that uses the `.gs`
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file extension. Meson now recognises and uses Genie files.
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## Pkgconfig support for additional cflags
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The Pkgconfig module object can add arbitrary extra cflags to the Cflags
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value in the .pc file, using the "extra_cflags" keyword:
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```meson
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pkg.generate(libraries : libs,
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subdirs : h,
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version : '1.0',
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name : 'libsimple',
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filebase : 'simple',
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description : 'A simple demo library.',
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extra_cflags : '-Dfoo' )
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```
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## Allow crate type configuration for Rust compiler
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Rust targets now take an optional `rust_crate_type` keyword, allowing
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you to set the crate type of the resulting artifact. Valid crate types
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are `dylib` or `cdylib` for shared libraries, and `rlib` or
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`staticlib` for static libraries. For more, see
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Rust's [linkage reference][rust-linkage].
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[rust-linkage]: https://doc.rust-lang.org/reference/linkage.html
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