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--- |
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title: Release 0.58.0 |
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short-description: Release notes for 0.58.0 |
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... |
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|
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# New features |
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|
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## New `meson.global_build_root()` and `meson.global_source_root()` methods |
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|
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Returns the root source and build directory of the main project. |
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|
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Those are direct replacement for `meson.build_root()` and `meson.source_root()` |
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that have been deprecated since 0.56.0. In some rare occasions they could not be |
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replaced by `meson.project_source_root()` or `meson.current_source_dir()`, in |
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which case the new methods can now be used instead. Old methods are still |
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deprecated because their names are not explicit enough and created many issues |
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when a project is being used as a subproject. |
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|
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## Developer environment |
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|
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New method `meson.add_devenv()` adds an [`environment()`](#environment) object |
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to the list of environments that will be applied when using `meson devenv` |
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command line. This is useful for developpers who wish to use the project without |
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installing it, it is often needed to set for example the path to plugins |
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directory, etc. Alternatively, a list or dictionary can be passed as first |
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argument. |
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|
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``` meson |
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devenv = environment() |
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devenv.set('PLUGINS_PATH', meson.current_build_dir()) |
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... |
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meson.add_devenv(devenv) |
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``` |
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|
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New command line has been added: `meson devenv -C builddir [<command>]`. |
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It runs a command, or open interactive shell if no command is provided, with |
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environment setup to run project from the build directory, without installation. |
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|
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These variables are set in environment in addition to those set using `meson.add_devenv()`: |
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- `MESON_DEVENV` is defined to `'1'`. |
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- `MESON_PROJECT_NAME` is defined to the main project's name. |
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- `PKG_CONFIG_PATH` includes the directory where Meson generates `-uninstalled.pc` |
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files. |
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- `PATH` includes every directory where there is an executable that would be |
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installed into `bindir`. On windows it also includes every directory where there |
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is a DLL needed to run those executables. |
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- `LD_LIBRARY_PATH` includes every directory where there is a shared library that |
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would be installed into `libdir`. This allows to run system application using |
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custom build of some libraries. For example running system GEdit when building |
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GTK from git. On OSX the environment variable is `DYLD_LIBRARY_PATH` and |
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`PATH` on Windows. |
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- `GI_TYPELIB_PATH` includes every directory where a GObject Introspection |
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typelib is built. This is automatically set when using `gnome.generate_gir()`. |
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|
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## `-pipe` no longer used by default |
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|
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Meson used to add the `-pipe` command line argument to all compilers |
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that supported it, but no longer does. If you need this, then you can |
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add it manually. However note that you should not do this unless you |
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have actually measured that it provides performance improvements. In |
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our tests we could not find a case where adding `-pipe` made |
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compilation faster and using `-pipe` [can cause sporadic build |
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failures in certain |
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cases](https://github.com/mesonbuild/meson/issues/8508). |
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|
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## `meson.add_dist_script()` allowd in subprojects |
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|
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`meson.add_dist_script()` can now be invoked from a subproject, it was a hard |
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error in earlier versions. Subproject dist scripts will only be executed |
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when running `meson dist --include-subprojects`. `MESON_PROJECT_SOURCE_ROOT`, |
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`MESON_PROJECT_BUILD_ROOT` and `MESON_PROJECT_DIST_ROOT` environment variables |
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are set when dist scripts are run. They are identical to `MESON_SOURCE_ROOT`, |
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`MESON_BUILD_ROOT` and `MESON_DIST_ROOT` for main project scripts, but for |
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subproject scripts they have the path to the root of the subproject appended, |
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usually `subprojects/<subproject-name>`. |
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|
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Note that existing dist scripts likely need to be modified to use those new |
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environment variables instead of `MESON_DIST_ROOT` to work properly when used |
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from a subproject. |
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|
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## Do not add custom target dir to header path if `implicit_include_directories` is `false` |
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|
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If you do the following: |
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|
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```meson |
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# in some subdirectory |
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gen_h = custom_target(...) |
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# in some other directory |
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executable('foo', 'foo.c', gen_h) |
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``` |
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|
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then the output directory of the custom target is automatically added |
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to the header search path. This is convenient, but sometimes it can |
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lead to problems. Starting with this version, the directory will no |
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longer be put in the search path if the target has |
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`implicit_include_directories: false`. In these cases you need to set |
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up the path manually with `include_directories`. |
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|
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## Multiple append() and prepend() in `environment()` object |
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|
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`append()` and `prepend()` methods can now be called multiple times |
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on the same `varname`. Earlier Meson versions would warn and only the last |
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opperation was taking effect. |
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|
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```meson |
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env = environment() |
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|
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# MY_PATH will be '0:1:2:3' |
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env.set('MY_PATH', '1') |
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env.append('MY_PATH', '2') |
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env.append('MY_PATH', '3') |
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env.prepend('MY_PATH', '0') |
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``` |
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|
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|
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## `dep.get_variable(varname)` |
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|
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`dep.get_variable()` now has `varname` as first positional argument. |
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It is used as default value for `cmake`, `pkgconfig`, `configtool` and `internal` |
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keyword arguments. It is useful in the common case where `pkgconfig` and `internal` |
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use the same variable name, in which case it's easier to write `dep.get_variable('foo')` |
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instead of `dep.get_variable(pkgconfig: 'foo', internal: 'foo')`. |
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|
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|
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## clang-format include and ignore lists |
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|
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When clang-format is installed and a `.clang-format` file is found at the main |
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project's root source directory, Meson automatically adds a `clang-format` target |
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that reformat all C and C++ files. |
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|
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It is now possible to restrict files to be reformatted with optional |
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`.clang-format-include` and `.clang-format-ignore` files. |
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|
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The file `.clang-format-include` contains a list of patterns matching the files |
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that will be reformatted. The `**` pattern matches this directory and all |
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subdirectories recursively. Empty lines and lines starting with `#` are ignored. |
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If `.clang-format-include` is not found, the pattern defaults to `**/*` which |
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means all files recursively in the source directory but has the disadvantage to |
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walk the whole source tree which could be slow in the case it contains lots of |
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files. |
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|
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Example of `.clang-format-include` file: |
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``` |
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# All files in src/ and its subdirectories |
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src/**/* |
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|
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# All files in include/ but not its subdirectories |
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include/* |
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``` |
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|
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The file `.clang-format-ignore` contains a list of patterns matching the files |
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that will be excluded. Files matching the include list (see above) that match |
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one of the ignore pattern will not be reformatted. Unlike include patters, ignore |
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patterns does not support `**` and a single `*` match any characters including |
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path separators. Empty lines and lines starting with `#` are ignored. |
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|
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The build directory and file without a well known C or C++ suffix are always |
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ignored. |
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|
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Example of `.clang-format-ignore` file: |
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``` |
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# Skip C++ files in src/ directory |
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src/*.cpp |
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``` |
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|
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A new target `clang-format-check` has been added. It returns an error code if |
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any file needs to be reformatted. This is intended to be used by CI. |
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|
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## Introducing format strings to the Meson language |
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|
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In addition to the conventional `'A string @0@ to be formatted @1@'.format(n, m)` |
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method of formatting strings in the Meson language, there's now the additional |
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`f'A string @n@ to be formatted @m@'` notation that provides a non-positional |
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and clearer alternative. Meson's format strings are currently restricted to |
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identity-expressions, meaning `f'format @'m' + 'e'@'` will not parse. |
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|
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## Skip subprojects installation |
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|
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It is now possible to skip installation of some or all subprojects. This is |
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useful when subprojects are internal dependencies static linked into the main |
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project. |
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|
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By default all subprojects are still installed. |
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- `meson install -C builddir --skip-subprojects` installs only the main project. |
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- `meson install -C builddir --skip-subprojects foo,bar` installs the main project |
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and all subprojects except for subprojects `foo` and `bar` if they are used. |
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|
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## String `.replace()` |
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|
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String objects now have a method called replace for replacing all instances of a |
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substring in a string with another. |
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|
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```meson |
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s = 'aaabbb' |
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s = s.replace('aaa', 'bbb') |
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# 's' is now 'bbbbbb' |
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``` |
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|
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## `meson.get_cross_property()` has been deprecated |
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|
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It's a pure subset of `meson.get_external_property`, and works strangely in |
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host == build configurations, since it would be more accurately described as |
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`get_host_property`. |
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|
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## New `range()` function |
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|
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``` meson |
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rangeobject range(stop) |
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rangeobject range(start, stop[, step]) |
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``` |
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|
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Return an opaque object that can be only be used in `foreach` statements. |
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- `start` must be integer greater or equal to 0. Defaults to 0. |
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- `stop` must be integer greater or equal to `start`. |
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- `step` must be integer greater or equal to 1. Defaults to 1. |
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|
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It cause the `foreach` loop to be called with the value from `start` included |
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to `stop` excluded with an increment of `step` after each loop. |
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|
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```meson |
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# Loop 15 times with i from 0 to 14 included. |
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foreach i : range(15) |
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... |
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endforeach |
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``` |
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|
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The range object can also be assigned to a variable and indexed. |
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```meson |
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r = range(5, 10, 2) |
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assert(r[2] == 9) |
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``` |
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|
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|
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## Xcode improvements |
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|
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The Xcode backend has been much improved and should now we usable |
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enough for day to day development. |
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|
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## Use fallback from wrap file when force fallback |
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|
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Optional dependency like below will now fallback to the subproject |
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defined in the wrap file in the case `wrap_mode` is set to `forcefallback` |
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or `force_fallback_for` contains the subproject. |
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|
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```meson |
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# required is false because we could fallback to cc.find_library(), but in the |
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# forcefallback case this now configure the subproject. |
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dep = dependency('foo-1.0', required: false) |
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if not dep.found() |
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dep = cc.find_library('foo', has_headers: 'foo.h') |
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endif |
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``` |
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|
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```ini |
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[wrap-file] |
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... |
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[provide] |
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dependency_names = foo-1.0 |
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``` |
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|
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## `error()` with multiple arguments |
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|
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Just like `warning()` and `message()`, `error()` can now take more than one |
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argument that will be separated by space. |
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|
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## Specify man page locale during installation |
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|
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Locale directories can now be passed to `install_man`: |
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|
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```meson |
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# instead of |
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# install_data('foo.fr.1', install_dir: join_paths(get_option('mandir'), 'fr', 'man1'), rename: 'foo.1')` |
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install_man('foo.fr.1', locale: 'fr') |
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``` |
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|
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## Passing `custom_target()` output to `pkg.generate()` |
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|
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It is now allowed to pass libraries generated by a `custom_target()` to |
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pkg-config file generator. The output filename must have a known library extension |
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such as `.a`, `.so`, etc. |
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|
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## JDK System Dependency |
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|
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When building projects such as those interacting with the JNI, you need access |
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to a few header files located in a Java installation. This system dependency |
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will add the correct include paths to your target. It assumes that either |
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`JAVA_HOME` will be set to a valid Java installation, or the default `javac` on |
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your system is a located in the `bin` directory of a Java installation. Note: |
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symlinks are resolved. |
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|
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```meson |
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jdk = dependency('jdk', version : '>=1.8') |
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``` |
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|
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Currently this system dependency only works on `linux`, `win32`, and `darwin`. |
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This can easily be extended given the correct information about your compiler |
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and platform in an issue. |
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|
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## `meson subprojects update --reset` now re-extract tarballs |
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|
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When using `--reset` option, the source tree of `[wrap-file]` subprojects is now |
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deleted and re-extracted from cached tarballs, or re-downloaded. This is because |
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Meson has no way to know if the source tree or the wrap file has been modified, |
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and `--reset` should guarantee that latest code is being used on next reconfigure. |
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|
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Use `--reset` with caution if you do local changes on non-git subprojects. |
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|
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## Allow using generator with CustomTaget or Index of CustomTarget. |
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|
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Calling `generator.process()` with either a CustomTaget or Index of CustomTarget |
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as files is now permitted. |
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|
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## Qt Dependency uses a Factory |
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|
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This separates the Pkg-config and QMake based discovery methods into two |
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distinct classes in the backend. This allows using |
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`dependency.get_variable()` and `dependency.get_pkg_config_variable()`, as |
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well as being a cleaner implementation. |
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|
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## Purge subprojects folder |
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|
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It is now possible to purge a subprojects folder of artifacts created |
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from wrap-based subprojects including anything in `packagecache`. This is useful |
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when you want to return to a completely clean source tree or busting caches with |
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stale patch directories or caches. By default the command will only print out |
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what it is removing. You need to pass `--confirm` to the command for actual |
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artifacts to be purged. |
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|
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By default all wrap-based subprojects will be purged. |
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|
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- `meson subprojects purge` prints non-cache wrap artifacts which will be |
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purged. |
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- `meson subprojects purge --confirm` purges non-cache wrap artifacts. |
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- `meson subprojects purge --confirm --include-cache` also removes the cache |
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artifacts. |
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- `meson subprojects purge --confirm subproj1 subproj2` removes non-cache wrap |
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artifacts associated with the listed subprojects. |
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|
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## Check if native or cross-file properties exist |
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|
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It is now possible to check whether a native property or a cross-file property |
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exists with `meson.has_external_property('foo')`. This is useful if the |
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property in question is a boolean and one wants to distinguish between |
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"set" and "not provided" which can't be done the usual way by passing a |
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fallback parameter to `meson.get_external_property()` in this particular case. |
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|
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## `summary()` accepts features |
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|
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Build feature options can be passed to `summary()` as the value to be printed. |
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|
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## Address sanitizer support for Visual Studio |
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|
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The `b_sanitize` option for enabling Address sanitizer now works with |
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the Visual Studio compilers. This requires [a sufficiently new version |
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of Visual |
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Studio](https://devblogs.microsoft.com/cppblog/address-sanitizer-for-msvc-now-generally-available/). |
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|
@ -1,43 +0,0 @@ |
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## clang-format include and ignore lists |
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|
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When clang-format is installed and a `.clang-format` file is found at the main |
||||
project's root source directory, Meson automatically adds a `clang-format` target |
||||
that reformat all C and C++ files. |
||||
|
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It is now possible to restrict files to be reformatted with optional |
||||
`.clang-format-include` and `.clang-format-ignore` files. |
||||
|
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The file `.clang-format-include` contains a list of patterns matching the files |
||||
that will be reformatted. The `**` pattern matches this directory and all |
||||
subdirectories recursively. Empty lines and lines starting with `#` are ignored. |
||||
If `.clang-format-include` is not found, the pattern defaults to `**/*` which |
||||
means all files recursively in the source directory but has the disadvantage to |
||||
walk the whole source tree which could be slow in the case it contains lots of |
||||
files. |
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|
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Example of `.clang-format-include` file: |
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``` |
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# All files in src/ and its subdirectories |
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src/**/* |
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|
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# All files in include/ but not its subdirectories |
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include/* |
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``` |
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|
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The file `.clang-format-ignore` contains a list of patterns matching the files |
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that will be excluded. Files matching the include list (see above) that match |
||||
one of the ignore pattern will not be reformatted. Unlike include patters, ignore |
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patterns does not support `**` and a single `*` match any characters including |
||||
path separators. Empty lines and lines starting with `#` are ignored. |
||||
|
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The build directory and file without a well known C or C++ suffix are always |
||||
ignored. |
||||
|
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Example of `.clang-format-ignore` file: |
||||
``` |
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# Skip C++ files in src/ directory |
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src/*.cpp |
||||
``` |
||||
|
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A new target `clang-format-check` has been added. It returns an error code if |
||||
any file needs to be reformatted. This is intended to be used by CI. |
@ -1,17 +0,0 @@ |
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## Do not add custom target dir to header path if `implicit_include_directories` is `false` |
||||
|
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If you do the following: |
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|
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```meson |
||||
# in some subdirectory |
||||
gen_h = custom_target(...) |
||||
# in some other directory |
||||
executable('foo', 'foo.c', gen_h) |
||||
``` |
||||
|
||||
then the output directory of the custom target is automatically added |
||||
to the header search path. This is convenient, but sometimes it can |
||||
lead to problems. Starting with this version, the directory will no |
||||
longer be put in the search path if the target has |
||||
`implicit_include_directories: false`. In these cases you need to set |
||||
up the path manually with `include_directories`. |
@ -1,8 +0,0 @@ |
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## `dep.get_variable(varname)` |
||||
|
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`dep.get_variable()` now has `varname` as first positional argument. |
||||
It is used as default value for `cmake`, `pkgconfig`, `configtool` and `internal` |
||||
keyword arguments. It is useful in the common case where `pkgconfig` and `internal` |
||||
use the same variable name, in which case it's easier to write `dep.get_variable('foo')` |
||||
instead of `dep.get_variable(pkgconfig: 'foo', internal: 'foo')`. |
||||
|
@ -1,5 +0,0 @@ |
||||
## `meson.get_cross_property()` has been deprecated |
||||
|
||||
It's a pure subset of `meson.get_external_property`, and works strangely in |
||||
host == build configurations, since it would be more accurately described as |
||||
`get_host_property`. |
@ -1,35 +0,0 @@ |
||||
## Developer environment |
||||
|
||||
New method `meson.add_devenv()` adds an [`environment()`](#environment) object |
||||
to the list of environments that will be applied when using `meson devenv` |
||||
command line. This is useful for developpers who wish to use the project without |
||||
installing it, it is often needed to set for example the path to plugins |
||||
directory, etc. Alternatively, a list or dictionary can be passed as first |
||||
argument. |
||||
|
||||
``` meson |
||||
devenv = environment() |
||||
devenv.set('PLUGINS_PATH', meson.current_build_dir()) |
||||
... |
||||
meson.add_devenv(devenv) |
||||
``` |
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|
||||
New command line has been added: `meson devenv -C builddir [<command>]`. |
||||
It runs a command, or open interactive shell if no command is provided, with |
||||
environment setup to run project from the build directory, without installation. |
||||
|
||||
These variables are set in environment in addition to those set using `meson.add_devenv()`: |
||||
- `MESON_DEVENV` is defined to `'1'`. |
||||
- `MESON_PROJECT_NAME` is defined to the main project's name. |
||||
- `PKG_CONFIG_PATH` includes the directory where Meson generates `-uninstalled.pc` |
||||
files. |
||||
- `PATH` includes every directory where there is an executable that would be |
||||
installed into `bindir`. On windows it also includes every directory where there |
||||
is a DLL needed to run those executables. |
||||
- `LD_LIBRARY_PATH` includes every directory where there is a shared library that |
||||
would be installed into `libdir`. This allows to run system application using |
||||
custom build of some libraries. For example running system GEdit when building |
||||
GTK from git. On OSX the environment variable is `DYLD_LIBRARY_PATH` and |
||||
`PATH` on Windows. |
||||
- `GI_TYPELIB_PATH` includes every directory where a GObject Introspection |
||||
typelib is built. This is automatically set when using `gnome.generate_gir()`. |
@ -1,14 +0,0 @@ |
||||
## `meson.add_dist_script()` allowd in subprojects |
||||
|
||||
`meson.add_dist_script()` can now be invoked from a subproject, it was a hard |
||||
error in earlier versions. Subproject dist scripts will only be executed |
||||
when running `meson dist --include-subprojects`. `MESON_PROJECT_SOURCE_ROOT`, |
||||
`MESON_PROJECT_BUILD_ROOT` and `MESON_PROJECT_DIST_ROOT` environment variables |
||||
are set when dist scripts are run. They are identical to `MESON_SOURCE_ROOT`, |
||||
`MESON_BUILD_ROOT` and `MESON_DIST_ROOT` for main project scripts, but for |
||||
subproject scripts they have the path to the root of the subproject appended, |
||||
usually `subprojects/<subproject-name>`. |
||||
|
||||
Note that existing dist scripts likely need to be modified to use those new |
||||
environment variables instead of `MESON_DIST_ROOT` to work properly when used |
||||
from a subproject. |
@ -1,16 +0,0 @@ |
||||
## Multiple append() and prepend() in `environment()` object |
||||
|
||||
`append()` and `prepend()` methods can now be called multiple times |
||||
on the same `varname`. Earlier Meson versions would warn and only the last |
||||
opperation was taking effect. |
||||
|
||||
```meson |
||||
env = environment() |
||||
|
||||
# MY_PATH will be '0:1:2:3' |
||||
env.set('MY_PATH', '1') |
||||
env.append('MY_PATH', '2') |
||||
env.append('MY_PATH', '3') |
||||
env.prepend('MY_PATH', '0') |
||||
``` |
||||
|
@ -1,4 +0,0 @@ |
||||
## `error()` with multiple arguments |
||||
|
||||
Just like `warning()` and `message()`, `error()` can now take more than one |
||||
argument that will be separated by space. |
@ -1,21 +0,0 @@ |
||||
## Use fallback from wrap file when force fallback |
||||
|
||||
Optional dependency like below will now fallback to the subproject |
||||
defined in the wrap file in the case `wrap_mode` is set to `forcefallback` |
||||
or `force_fallback_for` contains the subproject. |
||||
|
||||
```meson |
||||
# required is false because we could fallback to cc.find_library(), but in the |
||||
# forcefallback case this now configure the subproject. |
||||
dep = dependency('foo-1.0', required: false) |
||||
if not dep.found() |
||||
dep = cc.find_library('foo', has_headers: 'foo.h') |
||||
endif |
||||
``` |
||||
|
||||
```ini |
||||
[wrap-file] |
||||
... |
||||
[provide] |
||||
dependency_names = foo-1.0 |
||||
``` |
@ -1,7 +0,0 @@ |
||||
## Introducing format strings to the Meson language |
||||
|
||||
In addition to the conventional `'A string @0@ to be formatted @1@'.format(n, m)` |
||||
method of formatting strings in the Meson language, there's now the additional |
||||
`f'A string @n@ to be formatted @m@'` notation that provides a non-positional |
||||
and clearer alternative. Meson's format strings are currently restricted to |
||||
identity-expressions, meaning `f'format @'m' + 'e'@'` will not parse. |
@ -1,10 +0,0 @@ |
||||
## New `meson.global_build_root()` and `meson.global_source_root()` methods |
||||
|
||||
Returns the root source and build directory of the main project. |
||||
|
||||
Those are direct replacement for `meson.build_root()` and `meson.source_root()` |
||||
that have been deprecated since 0.56.0. In some rare occasions they could not be |
||||
replaced by `meson.project_source_root()` or `meson.current_source_dir()`, in |
||||
which case the new methods can now be used instead. Old methods are still |
||||
deprecated because their names are not explicit enough and created many issues |
||||
when a project is being used as a subproject. |
@ -1,7 +0,0 @@ |
||||
## Check if native or cross-file properties exist |
||||
|
||||
It is now possible to check whether a native property or a cross-file property |
||||
exists with `meson.has_external_property('foo')`. This is useful if the |
||||
property in question is a boolean and one wants to distinguish between |
||||
"set" and "not provided" which can't be done the usual way by passing a |
||||
fallback parameter to `meson.get_external_property()` in this particular case. |
@ -1,9 +0,0 @@ |
||||
## Specify man page locale during installation |
||||
|
||||
Locale directories can now be passed to `install_man`: |
||||
|
||||
```meson |
||||
# instead of |
||||
# install_data('foo.fr.1', install_dir: join_paths(get_option('mandir'), 'fr', 'man1'), rename: 'foo.1')` |
||||
install_man('foo.fr.1', locale: 'fr') |
||||
``` |
@ -1,10 +0,0 @@ |
||||
## Skip subprojects installation |
||||
|
||||
It is now possible to skip installation of some or all subprojects. This is |
||||
useful when subprojects are internal dependencies static linked into the main |
||||
project. |
||||
|
||||
By default all subprojects are still installed. |
||||
- `meson install -C builddir --skip-subprojects` installs only the main project. |
||||
- `meson install -C builddir --skip-subprojects foo,bar` installs the main project |
||||
and all subprojects except for subprojects `foo` and `bar` if they are used. |
@ -1,16 +0,0 @@ |
||||
## JDK System Dependency |
||||
|
||||
When building projects such as those interacting with the JNI, you need access |
||||
to a few header files located in a Java installation. This system dependency |
||||
will add the correct include paths to your target. It assumes that either |
||||
`JAVA_HOME` will be set to a valid Java installation, or the default `javac` on |
||||
your system is a located in the `bin` directory of a Java installation. Note: |
||||
symlinks are resolved. |
||||
|
||||
```meson |
||||
jdk = dependency('jdk', version : '>=1.8') |
||||
``` |
||||
|
||||
Currently this system dependency only works on `linux`, `win32`, and `darwin`. |
||||
This can easily be extended given the correct information about your compiler |
||||
and platform in an issue. |
@ -1,10 +0,0 @@ |
||||
## `-pipe` no longer used by default |
||||
|
||||
Meson used to add the `-pipe` command line argument to all compilers |
||||
that supported it, but no longer does. If you need this, then you can |
||||
add it manually. However note that you should not do this unless you |
||||
have actually measured that it provides performance improvements. In |
||||
our tests we could not find a case where adding `-pipe` made |
||||
compilation faster and using `-pipe` [can cause sporadic build |
||||
failures in certain |
||||
cases](https://github.com/mesonbuild/meson/issues/8508). |
@ -1,4 +0,0 @@ |
||||
## Allow using generator with CustomTaget or Index of CustomTarget. |
||||
|
||||
Calling `generator.process()` with either a CustomTaget or Index of CustomTarget |
||||
as files is now permitted. |
@ -1,5 +0,0 @@ |
||||
## Passing `custom_target()` output to `pkg.generate()` |
||||
|
||||
It is now allowed to pass libraries generated by a `custom_target()` to |
||||
pkg-config file generator. The output filename must have a known library extension |
||||
such as `.a`, `.so`, etc. |
@ -1,6 +0,0 @@ |
||||
## Qt Dependency uses a Factory |
||||
|
||||
This separates the Pkg-config and QMake based discovery methods into two |
||||
distinct classes in the backend. This allows using |
||||
`dependency.get_variable()` and `dependency.get_pkg_config_variable()`, as |
||||
well as being a cleaner implementation. |
@ -1,28 +0,0 @@ |
||||
## New `range()` function |
||||
|
||||
``` meson |
||||
rangeobject range(stop) |
||||
rangeobject range(start, stop[, step]) |
||||
``` |
||||
|
||||
Return an opaque object that can be only be used in `foreach` statements. |
||||
- `start` must be integer greater or equal to 0. Defaults to 0. |
||||
- `stop` must be integer greater or equal to `start`. |
||||
- `step` must be integer greater or equal to 1. Defaults to 1. |
||||
|
||||
It cause the `foreach` loop to be called with the value from `start` included |
||||
to `stop` excluded with an increment of `step` after each loop. |
||||
|
||||
```meson |
||||
# Loop 15 times with i from 0 to 14 included. |
||||
foreach i : range(15) |
||||
... |
||||
endforeach |
||||
``` |
||||
|
||||
The range object can also be assigned to a variable and indexed. |
||||
```meson |
||||
r = range(5, 10, 2) |
||||
assert(r[2] == 9) |
||||
``` |
||||
|
@ -1,10 +0,0 @@ |
||||
## String `.replace()` |
||||
|
||||
String objects now have a method called replace for replacing all instances of a |
||||
substring in a string with another. |
||||
|
||||
```meson |
||||
s = 'aaabbb' |
||||
s = s.replace('aaa', 'bbb') |
||||
# 's' is now 'bbbbbb' |
||||
``` |
@ -1,18 +0,0 @@ |
||||
## Purge subprojects folder |
||||
|
||||
It is now possible to purge a subprojects folder of artifacts created |
||||
from wrap-based subprojects including anything in `packagecache`. This is useful |
||||
when you want to return to a completely clean source tree or busting caches with |
||||
stale patch directories or caches. By default the command will only print out |
||||
what it is removing. You need to pass `--confirm` to the command for actual |
||||
artifacts to be purged. |
||||
|
||||
By default all wrap-based subprojects will be purged. |
||||
|
||||
- `meson subprojects purge` prints non-cache wrap artifacts which will be |
||||
purged. |
||||
- `meson subprojects purge --confirm` purges non-cache wrap artifacts. |
||||
- `meson subprojects purge --confirm --include-cache` also removes the cache |
||||
artifacts. |
||||
- `meson subprojects purge --confirm subproj1 subproj2` removes non-cache wrap |
||||
artifacts associated with the listed subprojects. |
@ -1,8 +0,0 @@ |
||||
## `meson subprojects update --reset` now re-extract tarballs |
||||
|
||||
When using `--reset` option, the source tree of `[wrap-file]` subprojects is now |
||||
deleted and re-extracted from cached tarballs, or re-downloaded. This is because |
||||
Meson has no way to know if the source tree or the wrap file has been modified, |
||||
and `--reset` should guarantee that latest code is being used on next reconfigure. |
||||
|
||||
Use `--reset` with caution if you do local changes on non-git subprojects. |
@ -1,3 +0,0 @@ |
||||
## `summary()` accepts features |
||||
|
||||
Build feature options can be passed to `summary()` as the value to be printed. |
@ -1,6 +0,0 @@ |
||||
## Address sanitizer support for Visual Studio |
||||
|
||||
The `b_sanitize` option for enabling Address sanitizer now works with |
||||
the Visual Studio compilers. This requires [a sufficiently new version |
||||
of Visual |
||||
Studio](https://devblogs.microsoft.com/cppblog/address-sanitizer-for-msvc-now-generally-available/). |
@ -1,4 +0,0 @@ |
||||
## Xcode improvements |
||||
|
||||
The Xcode backend has been much improved and should now we usable |
||||
enough for day to day development. |
Loading…
Reference in new issue