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123 lines
3.8 KiB
123 lines
3.8 KiB
--- |
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title: Release 0.38 |
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short-description: Release notes for 0.38 |
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... |
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## Uninstall target |
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Meson allows you to uninstall an install step by invoking the |
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uninstall target. This will remove all files installed as part of |
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install. Note that this does not restore the original files. This also |
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does not undo changes done by custom install scripts (because they can |
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do arbitrary install operations). |
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## Support for arbitrary test setups |
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Sometimes you need to run unit tests with special settings. For |
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example under Valgrind. Usually this requires extra command line |
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options for the tool. This is supported with the new *test setup* |
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feature. For example to set up a test run with Valgrind, you'd write |
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this in a `meson.build` file: |
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```meson |
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add_test_setup('valgrind', |
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exe_wrapper : [vg, '--error-exitcode=1', '--leak-check=full'], |
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timeout_multiplier : 100) |
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``` |
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This tells Meson to run tests with Valgrind using the given options |
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and multiplying the test timeout values by 100. To run this test setup |
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simply issue the following command: |
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```console |
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$ mesontest --setup=valgrind |
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``` |
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## Intel C/C++ compiler support |
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As usual, just set `CC=icc CXX=icpc` and Meson will use it as the |
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C/C++ compiler. Currently only Linux is supported. |
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## Get values from configuration data objects |
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Now it is possible to query values stored in configuration data |
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objects. |
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```meson |
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cdata.set('key', 'value') |
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cdata.get('key') # returns 'value' |
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cdata.get('nokey', 'default') # returns 'default' |
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cdata.get('nokey') # halts with an error |
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``` |
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## Python 3 module support |
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Building Python 3 extension modules has always been possible, but it |
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is now even easier: |
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```meson |
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py3_mod = import('python3') |
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pylib = py3_mod.extension_module('modname', |
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'modsource.c', |
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dependencies : py3_dep) |
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``` |
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## Default options to subprojects |
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Projects can specify overriding values for subprojects' |
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`default_options` when invoking a subproject: |
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```meson |
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subproject('foo', default_options : ['optname=overridevalue']) |
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dependency('some-dep', fallback : ['some_subproject', 'some_dep'], default_options : ['optname=overridevalue']) |
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``` |
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The effect is the same as if the default options were written in the |
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subproject's `project` call. |
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## Set targets to be built (or not) by default |
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Build targets got a new keyword `build_by_default` which tells whether |
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the target should be built by default when running e.g. `ninja`. |
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Custom targets are not built by default but other targets are. Any |
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target that is tagged as installed or to be built always is also built |
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by default, regardless of the value of this keyword. |
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## Add option to mesonconf to wipe cached data. |
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Meson caches the results of dependency lookups. Sometimes these may |
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get out of sync with the system state. Mesonconf now has a |
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`--clearcache` option to clear these values so they will be |
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re-searched from the system upon next compile. |
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## Can specify file permissions and owner when installing data |
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The new `install_mode` keyword argument can be used to specify file |
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permissions and uid/gid of files when doing the install. This allows |
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you to, for example, install suid root scripts. |
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## `has_header()` checks are now faster |
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When using compilers that implement the [`__has_include()` |
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preprocessor |
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macro](https://clang.llvm.org/docs/LanguageExtensions.html#include-file-checking-macros), |
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the check is now ~40% faster. |
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## Array indexing now supports fallback values |
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The second argument to the array |
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[[list.get]] function is now returned |
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if the specified index could not be found |
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```meson |
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array = [10, 11, 12, 13] |
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array.get(0) # this will return `10` |
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array.get(4) # this will give an error about invalid index |
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array.get(4, 0) # this will return `0` |
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``` |
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## Silent mode for Mesontest |
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The Meson test executor got a new argument `-q` (and `--quiet`) that |
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suppresses all output of successful tests. This makes interactive |
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usage nicer because only errors are printed.
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