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