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148 lines
5.1 KiB
148 lines
5.1 KiB
--- |
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title: Release 0.42 |
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short-description: Release notes for 0.42 |
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... |
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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 |
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on Mercurial. As before, this remains possible only with the Ninja |
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backend. |
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## Keyword argument verification |
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Meson will now check the keyword arguments used when calling any |
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function and print a warning if any of the keyword arguments is not |
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known. In the 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 |
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`.gs` 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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## Base options accessible via get_option() |
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Base options are now accessible via the get_option() function. |
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```meson |
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uses_lto = get_option('b_lto') |
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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 Rust's [linkage |
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reference][rust-linkage]. |
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[rust-linkage]: https://doc.rust-lang.org/reference/linkage.html |
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## Simultaneous use of Address- and Undefined Behavior Sanitizers |
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Both the address- and undefined behavior sanitizers can now be used |
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simultaneously by passing `-Db_sanitize=address,undefined` to Meson. |
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## Unstable SIMD module |
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A new experimental module to compile code with many different SIMD |
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instruction sets and selecting the best one at runtime. This module |
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is unstable, meaning its API is subject to change in later releases. |
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It might also be removed altogether. |
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## Import libraries for executables on Windows |
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The new keyword `implib` to `executable()` allows generation of an import |
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library for the executable. |
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## Added build_rpath keyword argument |
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You can specify `build_rpath : '/foo/bar'` in build targets and the |
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given path will get added to the target's rpath in the build tree. It |
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is removed during the install step. |
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Meson will print a warning when the user tries to add an rpath linker |
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flag manually, e.g. via `link_args` to a target. This is not |
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recommended because having multiple rpath causes them to stomp on each |
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other. This warning will become a hard error in some future release. |
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## Vulkan dependency module |
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Vulkan can now be used as native dependency. The dependency module |
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will detect the VULKAN_SDK environment variable or otherwise try to |
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receive the vulkan library and header via pkgconfig or from the |
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system. |
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## Limiting the maximum number of linker processes |
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With the Ninja backend it is now possible to limit the maximum number of |
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concurrent linker processes. This is usually only needed for projects |
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that have many large link steps that cause the system to run out of |
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memory if they are run in parallel. This limit can be set with the |
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new `backend_max_links` option. |
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## Disable implicit include directories |
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By default Meson adds the current source and build directories to the |
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header search path. On some rare occasions this is not desired. Setting |
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the `implicit_include_directories` keyword argument to `false` these |
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directories are not used. |
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## Support for MPI dependency |
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MPI is now supported as a dependency. Because dependencies are |
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language-specific, you must specify the requested language with the |
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`language` keyword, i.e., `dependency('mpi', language='c')` will |
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request the C MPI headers and libraries. See [the MPI |
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dependency](Dependencies.md#mpi) for more information. |
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## Allow excluding files or directories from `install_subdir` |
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The [[install_subdir]] command |
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accepts the new `exclude_files` and `exclude_directories` keyword |
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arguments that allow specified files or directories to be excluded |
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from the installed subdirectory. |
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## Make all Meson functionality invocable via the main executable |
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Previously Meson had multiple executables such as `mesonintrospect` |
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and `mesontest`. They are now invocable via the main Meson executable |
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like this: |
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meson configure <arguments> # equivalent to mesonconf <options> |
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meson test <arguments> # equivalent to mesontest <arguments> |
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The old commands are still available but they are deprecated |
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and will be removed in some future release. |
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## Pcap dependency detector |
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Meson will automatically obtain dependency information for pcap |
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using the `pcap-config` tool. It is used like any other dependency: |
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```meson |
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pcap_dep = dependency('pcap', version : '>=1.0') |
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``` |
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## GNOME module mkenums_simple() addition |
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Most libraries and applications use the same standard templates for |
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glib-mkenums. There is now a new `mkenums_simple()` convenience method |
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that passes those default templates to glib-mkenums and allows some tweaks |
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such as optional function decorators or leading underscores.
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