The Meson Build System
http://mesonbuild.com/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
154 lines
4.7 KiB
154 lines
4.7 KiB
--- |
|
title: Release 0.44 |
|
short-description: Release notes for 0.44 |
|
... |
|
|
|
# New features |
|
|
|
## Added warning function |
|
|
|
This function prints its argument to the console prefixed by |
|
"WARNING:" in yellow color. A simple example: |
|
|
|
warning('foo is deprecated, please use bar instead') |
|
|
|
|
|
## 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. |
|
|
|
```meson |
|
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: |
|
|
|
```meson |
|
myprog = find_program('myscript.py') |
|
``` |
|
|
|
Then Meson will run the script with its internal Python version if necessary. |
|
|
|
## Libwmf dependency now supports libwmf-config |
|
|
|
Earlier, `dependency('libwmf')` could only detect the library with |
|
pkg-config files. Now, if pkg-config files are not found, Meson will |
|
look for `libwmf-config` and if it's found, will use that to find the |
|
library.
|
|
|