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Release-notes-for-1-8-0.html
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<h1 id="new-features-in-development">New features (in development)</h1>
<h2 id="new-argument-android_exe_type-for-executables">New argument <code>android_exe_type</code> for executables</h2>
<p>Android application executables actually need to be linked
as a shared object, which is loaded from a pre-warmed JVM.
Meson projects can now specify a new argument <code>android_exe_type</code>
and set it to <code>application</code>, in order produce such a shared library
only on Android targets.</p>
<p>This makes it possible to use the same <code>meson.build</code> file
for both Android and non-Android systems.</p>
<h2 id="changes-to-the-b_sanitize-option">Changes to the b_sanitize option</h2>
<p>Before 1.8 the <code>b_sanitize</code> option was a combo option, which is an enumerated
set of values. In 1.8 this was changed to a free-form array of options where
available sanitizers are not hardcoded anymore but instead verified via a
compiler check.</p>
<p>This solves a number of longstanding issues such as:</p>
<ul>
<li>Sanitizers may be supported by a compiler, but not on a specific platform
(OpenBSD).</li>
<li>New sanitizers are not recognized by Meson.</li>
<li>Using sanitizers in previously-unsupported combinations.</li>
</ul>
<p>To not break backwards compatibility, calling <code>get_option('b_sanitize')</code>
continues to return the configured value as a string, with a guarantee that
<code>address,undefined</code> remains ordered.</p>
<h2 id="new-c-standard-c2y-and-gnu2y">New C standard <code>c2y</code> (and <code>gnu2y</code>)</h2>
<p>The <code>c2y`` standard and its companion</code>gnu2y` are now supported
when using either Clang 19.0.0 or newer, or GCC 15.0.0 or newer.</p>
<h2 id="i18n-module-xgettext">i18n module xgettext</h2>
<p>There is a new <code>xgettext</code> function in <code>i18n</code> module that acts as a
wrapper around <code>xgettext</code>. It allows to extract strings to translate from
source files.</p>
<p>This function is convenient, because:</p>
<ul>
<li>It can find the sources files from a build target;</li>
<li>It will use an intermediate file when the number of source files is too
big to be handled directly from the command line;</li>
<li>It is able to get strings to translate from the dependencies of the given
targets.</li>
</ul>
<h2 id="version_compare-now-accept-multiple-compare-strings">
<code>version_compare</code> now accept multiple compare strings</h2>
<p>Is it now possible to compare version against multiple values, to check for
a range of version for instance.</p>
<pre><code class="language-meson">'1.5'.version_compare('>=1', '<2')
</code></pre>
<h2 id="improvements-to-objectivec-and-objectivec">Improvements to Objective-C and Objective-C++</h2>
<p>Meson does not assume anymore that gcc/g++ always support
Objective-C and Objective-C++, and instead checks that they
can actually do a basic compile.</p>
<p>Furthermore, Objective-C and Objective-C++ now support the
same language standards as C and C++ respectively.</p>
<h2 id="per-project-subproject-options-rewrite">Per project subproject options rewrite</h2>
<p>You can now define per-subproject values for all shared configuration
options. As an example you might want to enable optimizations on only
one subproject:</p>
<pre><code>meson configure -Dnumbercruncher:optimization=3
</code></pre>
<p>Subproject specific values can be removed with -U</p>
<pre><code>meson configure -Unumbercruncher:optimization
</code></pre>
<p>This is a major change in how options are handled, and the
implementation will evolve over the next few releases of Meson. If
this change causes an error in your builds, please <a href="https://github.com/mesonbuild/meson/issues/new">report an issue on
GitHub</a>.</p>
<p>We have tried to keep backwards compatibility as much as possible, but
this may lead to some build breakage.</p>
<h2 id="objects-added-correctly-to-rust-executables">
<code>objects</code> added correctly to Rust executables</h2>
<p>Any objects included in a Rust executable were previously ignored. They
are now added correctly.</p>
<h2 id="rusttest-now-supports-link_whole">
<code>rust.test</code> now supports <code>link_whole</code>
</h2>
<p>The <code>test</code> function in the <code>rust</code> module now supports the <code>link_whole</code>
keyword argument in addition to <code>link_with</code> and <code>dependencies</code>.</p>
<h2 id="meson-can-run-rustdoc-on-rust-projects">Meson can run "rustdoc" on Rust projects</h2>
<p>Meson now defines a <code>rustdoc</code> target if the project
uses the Rust programming language. The target runs rustdoc on all Rust
sources, using the <code>rustdoc</code> program from the same Rust toolchain as the
<code>rustc</code> compiler.</p>
<h2 id="the-wayland-module-is-stable">The Wayland module is stable</h2>
<p>The Wayland module has been tested in several projects and had the
last breaking change in Meson 0.64.0; it is now marked as stable.</p>
<h2 id="new-swift_std-compiler-option">New <code>swift_std</code> compiler option</h2>
<p>A new compiler option allows to set the language version that is passed
to swiftc (<code>none</code>, <code>4</code>, <code>4.2</code>, <code>5</code> or <code>6</code>).</p>
<h2 id="new-option-to-execute-a-slice-of-tests">New option to execute a slice of tests</h2>
<p>When tests take a long time to run a common strategy is to slice up the tests
into multiple sets, where each set is executed on a separate machine. You can
now use the <code>--slice i/n</code> argument for <code>meson test</code> to create <code>n</code> slices and
execute the <code>ith</code> slice.</p>
<h2 id="valgrind-now-fails-tests-if-errors-are-found">Valgrind now fails tests if errors are found</h2>
<p>Valgrind does not reflect an error in its exit code by default, meaning
a test may silently pass despite memory errors. Meson now exports
<code>VALGRIND_OPTS</code> such that Valgrind will exit with status 1 to indicate
an error if <code>VALGRIND_OPTS</code> is not set in the environment.</p>
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