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185 lines
6.8 KiB
185 lines
6.8 KiB
--- |
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title: Release 0.64.0 |
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short-description: Release notes for 0.64.0 |
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# New features |
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## Add `optimization` `plain` option |
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The `optimization` built-in option now accepts `plain` value, |
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which will not set any optimization flags. This is now the default |
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value of the flag for `buildtype=plain`, which is useful for distros, |
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that set the optimization and hardening flags by other means. |
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If you are using the value of `get_option('optimization')` in your |
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Meson scripts, make sure you are not making assumptions about it, |
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such as that the value can be passed to a compiler in `-O` flag. |
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## New languages: `nasm` and `masm` |
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When the `nasm` language is added to the project, `.asm` files are |
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automatically compiled with NASM. This is only supported for x86 and x86_64 CPU |
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family. `yasm` is used as fallback if `nasm` command is not found. |
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When the `masm` language is added to the project, `.masm` files are |
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automatically compiled with Microsoft's Macro Assembler. This is only supported |
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for x86, x86_64, ARM and AARCH64 CPU families. |
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Note that GNU Assembly files usually have `.s` or `.S` extension and were already |
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built using C compiler such as GCC or CLANG. |
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```meson |
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project('test', 'nasm') |
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exe = executable('hello', 'hello.asm') |
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test('hello', exe) |
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``` |
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## Pager and colors for `meson configure` output |
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The output of `meson configure`, printing all options, is now more readable by |
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automatically using a pager (`less` by default) and colors. The pager used can |
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be controlled by setting `PAGER` environment variable, or `--no-pager` command |
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line option. |
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## various `install_*` functions no longer handle the sticky bit |
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It is not possible to portably grant the sticky bit to a file, and where |
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possible, it doesn't do anything. It is not expected that any users are using |
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this functionality. |
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Variously: |
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- on Linux, it has no meaningful effect |
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- on Solaris, attempting to set the permission bit is silently ignored by the OS |
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- on FreeBSD, attempting to set the permission bit is an error |
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Attempting to set this permission bit in the `install_mode:` kwarg to any |
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function other than [[install_emptydir]] will now result in a warning, and the |
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permission bit being ignored. |
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## `fs.copyfile` to replace `configure_file(copy : true)` |
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A new method has been added to the `fs` module, `copyfile`. This method replaces |
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`configure_file(copy : true)`, but only copies files. Unlike `configure_file()` |
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it runs at build time, and the output name is optional defaulting to the |
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filename without paths of the input if unset: |
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```meson |
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fs.copyfile('src/file.txt') |
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``` |
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Will create a file in the current build directory called `file.txt` |
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```meson |
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fs.copyfile('file.txt', 'outfile.txt') |
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``` |
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Will create a copy renamed to `outfile.txt` |
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## Added `update_mime_database` to `gnome.post_install()` |
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Applications that install a `.xml` file containing a `mime-type` need to update |
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the cache upon installation. Most applications do that using a custom script, |
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but it can now be done by Meson directly. |
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## Added preserve_path arg to install_data |
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The [[install_data]] function now has an optional argument `preserve_path` |
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that allows installing multi-directory data file structures that live |
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alongside source code with a single command. |
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This is also available in the specialized `py_installation.install_sources` |
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method. |
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## BSD support for the `jni` dependency |
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This system dependency now supports all BSD systems that Meson currently |
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supports, including FreeBSD, NetBSD, OpenBSD, and DragonflyBSD. |
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## Credentials from `~/.netrc` for `https` URLs |
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When a subproject is downloaded using an `https://` URL, credentials from |
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`~/.netrc` are now used. This avoids hardcoding login and password in plain |
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text in the URL itself. |
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## Basic support for oneAPI compilers on Linux and Windows |
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To use on Linux: |
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``` |
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source /opt/intel/oneapi/setvars.sh |
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CC=icx CXX=icpx FC=ifx meson setup builddir |
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``` |
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## New method to preprocess source files |
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Compiler object has a new `preprocess()` method. It is supported by all C/C++ |
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compilers. It preprocess sources without compiling them. |
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The preprocessor will receive the same arguments (include directories, defines, |
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etc) as with normal compilation. That includes for example args added with |
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`add_project_arguments()`, or on the command line with `-Dc_args=-DFOO`. |
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```meson |
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cc = meson.get_compiler('c') |
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pp_files = cc.preprocess('foo.c', 'bar.c', output: '@PLAINNAME@') |
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exe = executable('app', pp_files) |
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``` |
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## python.find_installation() now accepts pure argument |
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The default value of `pure:` for `py.install_sources()` and |
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`py.get_install_dir()` can now be changed by explicitly passing a `pure:` kwarg |
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to `find_installation()`. |
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This can be used to ensure that multiple `install_sources()` invocations do not |
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forget to specify the kwarg each time. |
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## Generates rust-project.json when there are Rust targets |
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This is a format similar to compile_commands.json, but specifically used by the |
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official rust LSP, rust-analyzer. It is generated automatically if there are |
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Rust targets, and is placed in the build directory. |
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## `summary()` accepts disablers |
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Disabler options can be passed to `summary()` as the value to be printed. |
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## Option to allow meson test to fail fast after the first failing testcase |
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`meson test --maxfail=1` will now cause all pending or in-progress tests to be |
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canceled or interrupted after 1 test is marked as failing. This can be used for |
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example to quit a CI run and avoid burning additional time as soon as it is |
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known that the overall return status will be failing. |
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## Incremental ThinLTO with `b_thinlto_cache` |
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[Incremental ThinLTO](https://clang.llvm.org/docs/ThinLTO.html#incremental) can now be enabled by passing |
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`-Db_thinlto_cache=true` during setup. The use of caching speeds up incremental builds significantly while retaining all |
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the runtime performance benefits of ThinLTO. |
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The cache location defaults to a Meson-managed directory inside the build folder, but can be customized with |
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`b_thinlto_cache_dir`. |
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## Update all wraps from WrapDB with `meson wrap update` command |
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The command `meson wrap update`, with no extra argument, will now update all wraps |
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that comes from WrapDB to the latest version. The extra `--force` argument will |
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also replace wraps that do not come from WrapDB if one is available. |
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The command `meson subprojects update` will not download new wrap files from |
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WrapDB any more. |
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## Added `include_core_only` arg to wayland.scan_xml. |
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The `scan_xml` function from the wayland module now has an optional bool |
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argument `include_core_only`, so that headers generated by wayland-scanner now |
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only include `wayland-client-core.h` instead of `wayland-client.h`. |
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## Automatic fallback using WrapDB |
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A new command has been added: `meson wrap update-db`. It downloads the list of |
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wraps available in [WrapDB](https://wrapdb.mesonbuild.com) and stores it locally in |
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`subprojects/wrapdb.json`. When that file exists and a dependency is not found |
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on the system but is available in WrapDB, Meson will automatically download it. |
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