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diff --git a/docs/markdown/Release-notes-for-0.44.0.md b/docs/markdown/Release-notes-for-0.44.0.md index 0df2e97..93e224d 100644 --- a/docs/markdown/Release-notes-for-0.44.0.md +++ b/docs/markdown/Release-notes-for-0.44.0.md @@ -1,16 +1,143 @@ --- title: Release 0.44 -short-description: Release notes for 0.44 (preliminary) +short-description: Release notes for 0.44 ... # New features -This page is a placeholder for the eventual release notes. +## Added warning function -Notable new features should come with release note updates. This is -done by creating a file snippet called `snippets/featurename.md` and -whose contents should look like this: +This function prints its argument to the console prefixed by "WARNING:" in +yellow color. A simple example: - # Feature name +warning('foo is deprecated, please use bar instead') - A short description explaining the new feature and how it should be used. + +## Adds support for additional Qt5-Module keyword `moc_extra_arguments` + +When `moc`-ing sources, the `moc` tool does not know about any +preprocessor macros. The generated code might not match the input +files when the linking with the moc input sources happens. + +This amendment allows to specify a a list of additional arguments +passed to the `moc` tool. They are called `moc_extra_arguments`. + + +## Prefix-dependent defaults for sysconfdir, localstatedir and sharedstatedir + +These options now default in a way consistent with +[FHS](http://refspecs.linuxfoundation.org/fhs.shtml) and common usage. + +If prefix is `/usr`, default sysconfdir to `/etc`, localstatedir to `/var` and +sharedstatedir to `/var/lib`. + +If prefix is `/usr/local` (the default), default localstatedir to `/var/local` +and sharedstatedir to `/var/local/lib`. + + +## An array type for user options + +Previously to have an option that took more than one value a string +value would have to be created and split, but validating this was +difficult. A new array type has been added to the meson_options.txt +for this case. It works like a 'combo', but allows more than one +option to be passed. The values can optionally be validated against a +list of valid values. When used on the command line (with -D), values +are passed as a comma separated list. + +```meson +option('array_opt', type : 'array', choices : ['one', 'two', 'three'], value : ['one']) +``` + +These can be overwritten on the command line, + +```meson +meson _build -Darray_opt=two,three +``` + +## LLVM dependency supports both dynamic and static linking + +The LLVM dependency has been improved to consistently use dynamic linking. +Previously recent version (>= 3.9) would link dynamically while older versions +would link statically. + +Now LLVM also accepts the `static` keyword to enable statically linking to LLVM +modules instead of dynamically linking. + + +## Added `if_found` to subdir + +Added a new keyword argument to the `subdir` command. It is given a +list of dependency objects and the function will only recurse in the +subdirectory if they are all found. Typical usage goes like this. + + d1 = dependency('foo') # This is found + d2 = dependency('bar') # This is not found + + subdir('somedir', if_found : [d1, d2]) + +In this case the subdirectory would not be entered since `d2` could +not be found. + +## `get_unquoted()` method for the `configuration` data object + +New convenience method that allows reusing a variable value +defined quoted. Useful in C for config.h strings for example. + + +## Added disabler object + +A disabler object is a new kind of object that has very specific +semantics. If it is used as part of any other operation such as an +argument to a function call, logical operations etc, it will cause the +operation to not be evaluated. Instead the return value of said +operation will also be the disabler object. + +For example if you have an setup like this: + +```meson +dep = dependency('foo') +lib = shared_library('mylib', 'mylib.c', + dependencies : dep) +exe = executable('mytest', 'mytest.c', + link_with : lib) +test('mytest', exe) +``` + +If you replace the dependency with a disabler object like this: + +```meson +dep = disabler() +lib = shared_library('mylib', 'mylib.c', + dependencies : dep) +exe = executable('mytest', 'mytest.c', + link_with : lib) +test('mytest', exe) +``` + +Then the shared library, executable and unit test are not +created. This is a handy mechanism to cut down on the number of `if` +statements. + + +## Config-Tool based dependencies gained a method to get arbitrary options + +A number of dependencies (CUPS, LLVM, pcap, WxWidgets, GnuStep) use a config +tool instead of pkg-config. As of this version they now have a +`get_configtool_variable` method, which is analogous to the +`get_pkgconfig_variable` for pkg config. + +```meson +dep_llvm = dependency('LLVM') +llvm_inc_dir = dep_llvm.get_configtool_variable('includedir') +``` + +## Embedded Python in Windows MSI packages + +Meson now ships an internal version of Python in the MSI installer packages. +This means that it can run Python scripts that are part of your build +transparently. That is, if you do the following: + + myprog = find_program('myscript.py') + +Then Meson will run the script with its internal Python version if necessary. |