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---
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title: Release 1.0.0
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short-description: Release notes for 1.0.0
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...
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# New features
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Meson 1.0.0 was released on 23 December 2022
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## Compiler check functions `prefix` kwargs accepts arrays
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The `prefix` kwarg that most compiler check functions support
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now accepts an array in addition to a string. The elements of the
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array will be concatenated separated by a newline.
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This makes it more readable to write checks that need multiple headers
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to be included:
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```meson
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cc.check_header('GL/wglew.h', prefix : ['#include <windows.h>', '#include <GL/glew.h>'])
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```
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instead of
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```meson
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cc.check_header('GL/wglew.h', prefix : '#include <windows.h>\n#include <GL/glew.h>'])
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```
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## Flags removed from cpp/objcpp warning level 1
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`-Wnon-virtual-dtor` is no longer implied by `meson setup -Dwarning_level=1`.
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## Developer environment improvements
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When cross compiling, the developer environment now sets all environment
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variables for the HOST machine. It now also sets `QEMU_LD_PREFIX` to the
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`sys_root` value from cross file if property is defined. That means that cross
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compiled executables can often be run transparently on the build machine, for
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example when cross compiling for aarch64 linux from x86_64 linux.
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A new argument `--workdir` has been added, by default it is set to build
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directory. For example, `meson devenv -C builddir --workdir .` can be used to
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remain in the current dir (often source dir) instead.
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`--dump` now prints shell commands like `FOO="/prepend/path:$FOO:/append/path"`,
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using the literal `$FOO` instead of current value of `FOO` from environment.
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This makes easier to evaluate those expressions in a different environment.
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## Deprecate `java.generate_native_headers`, rename to `java.native_headers`
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The functions operate in the exact same way. The new name matches more with
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Meson function name styling.
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## rust.bindgen accepts a dependency argument
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The `bindgen` method of the `rust` module now accepts a dependencies argument.
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Any include paths in these dependencies will be passed to the underlying call to
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`clang`, and the call to `bindgen` will correctly depend on any generated sources.
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## String arguments to the rust.bindgen include_directories argument
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Most other cases of include_directories accept strings as well as
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`IncludeDirectory` objects, so lets do that here too for consistency.
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## The Rust module is stable
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Mesa is using the rust module in production, so it's time to mark it as stable.
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## `in` operator for strings
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`in` and `not in` operators now works on strings, in addition to arrays and
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dictionaries.
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```
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fs = import('fs')
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if 'something' in fs.read('somefile')
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# True
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endif
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```
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## `warning-level=everything` option
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The new `everything` value for the built-in `warning_level` enables roughly all applicable compiler warnings.
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For clang and MSVC, this simply enables `-Weverything` or `/Wall`, respectively.
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For GCC, meson enables warnings approximately equivalent to `-Weverything` from clang.
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