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