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-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
Prefix-dependent defaults for sysconfdir, localstatedir and sharedstatedir
These options now default in a way consistent with FHS and common usage.
If prefix is
/usr, default sysconfdir to
/etc, localstatedir to
If prefix is
/usr/local (the default), default localstatedir to
and sharedstatedir to
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.
option('array_opt', type : 'array', choices : ['one', 'two', 'three'], value : ['one'])
These can be overwritten on the command line,
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.
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
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:
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:
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
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.
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.
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