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@ -0,0 +1,224 @@ |
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--- |
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title: Release 1.1.0 |
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short-description: Release notes for 1.1.0 |
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... |
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|
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# New features |
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|
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Meson 1.1.0 was released on 10 April 2023 |
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## `clang-cl` now accepts `cpp_std=c++20` |
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|
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Requires `clang-cl` 13 or later. |
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|
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## coercing values in the option() function is deprecated |
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|
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Currently code such as: |
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```meson |
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option('foo', type : 'boolean', value : 'false') |
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``` |
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works, because Meson coerces `'false'` to `false`. |
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|
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This should be avoided, and will now result in a deprecation warning. |
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|
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## New `declare_dependency(objects: )` argument |
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|
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A new argument to `declare_dependency` makes it possible to add objects |
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directly to executables that use an internal dependency, without going |
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for example through `link_whole`. |
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|
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## Dump devenv into file and select format |
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|
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`meson devenv --dump [<filename>]` command now takes an optional filename argument |
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to write the environment into a file instead of printing to stdout. |
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|
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A new `--dump-format` argument has been added to select which shell format |
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should be used. There are currently 3 formats supported: |
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- `sh`: Lines are in the format `VAR=/prepend:$VAR:/append`. |
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- `export`: Same as `sh` but with extra `export VAR` lines. |
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- `vscode`: Same as `sh` but without `$VAR` substitution because they do not |
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seems to be properly supported by vscode. |
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|
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## Feature objects now have an enable_auto_if method |
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|
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This performs the opposite task of the disable_auto_if method, enabling the |
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feature if the condition is true. |
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|
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## Add a FeatureOption.enable_if and .disable_if |
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|
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These are useful when features need to be constrained to pass to [[dependency]], |
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as the behavior of an `auto` and `disabled` or `enabled` feature is markedly |
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different. consider the following case: |
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|
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```meson |
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opt = get_option('feature').disable_auto_if(not foo) |
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if opt.enabled() and not foo |
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error('Cannot enable feat when foo is not also enabled') |
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endif |
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dep = dependency('foo', required : opt) |
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``` |
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|
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This could be simplified to |
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```meson |
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opt = get_option('feature').disable_if(not foo, error_message : 'Cannot enable feature when foo is not also enabled') |
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dep = dependency('foo', required : opt) |
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``` |
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|
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For a real life example, here is some code in mesa: |
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```meson |
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_llvm = get_option('llvm') |
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dep_llvm = null_dep |
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with_llvm = false |
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if _llvm.allowed() |
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dep_llvm = dependency( |
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'llvm', |
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version : _llvm_version, |
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modules : llvm_modules, |
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optional_modules : llvm_optional_modules, |
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required : ( |
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with_amd_vk or with_gallium_radeonsi or with_gallium_opencl or with_clc |
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or _llvm.enabled() |
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), |
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static : not _shared_llvm, |
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fallback : ['llvm', 'dep_llvm'], |
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include_type : 'system', |
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) |
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with_llvm = dep_llvm.found() |
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endif |
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if with_llvm |
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... |
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elif with_amd_vk and with_aco_tests |
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error('ACO tests require LLVM, but LLVM is disabled.') |
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elif with_gallium_radeonsi or with_swrast_vk |
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error('The following drivers require LLVM: RadeonSI, SWR, Lavapipe. One of these is enabled, but LLVM is disabled.') |
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elif with_gallium_opencl |
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error('The OpenCL "Clover" state tracker requires LLVM, but LLVM is disabled.') |
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elif with_clc |
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error('The CLC compiler requires LLVM, but LLVM is disabled.') |
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else |
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draw_with_llvm = false |
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endif |
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``` |
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|
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simplified to: |
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```meson |
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_llvm = get_option('llvm') \ |
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.enable_if(with_amd_vk and with_aco_tests, error_message : 'ACO tests requires LLVM') \ |
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.enable_if(with_gallium_radeonsi, error_message : 'RadeonSI requires LLVM') \ |
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.enable_if(with_swrast_vk, error_message : 'Vulkan SWRAST requires LLVM') \ |
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.enable_if(with_gallium_opencl, error_message : 'The OpenCL Clover state trackers requires LLVM') \ |
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.enable_if(with_clc, error_message : 'CLC library requires LLVM') |
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|
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dep_llvm = dependency( |
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'llvm', |
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version : _llvm_version, |
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modules : llvm_modules, |
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optional_modules : llvm_optional_modules, |
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required : _llvm, |
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static : not _shared_llvm, |
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fallback : ['llvm', 'dep_llvm'], |
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include_type : 'system', |
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) |
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with_llvm = dep_llvm.found() |
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``` |
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|
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## Generated objects can be passed in the `objects:` keyword argument |
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|
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In previous versions of Meson, generated objects could only be |
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passed as sources of a build target. This was confusing, therefore |
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generated objects can now be passed in the `objects:` keyword |
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argument as well. |
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|
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## The project function now supports setting the project license files |
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|
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This goes together with the license name. The license files can be |
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automatically installed via [[meson.install_dependency_manifest]], |
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or queried via [[meson.project_license_files]]. |
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|
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## A new core directory option "licensedir" is available |
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|
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This will install a dependency manifest to the specified directory, if none |
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is is explicitly set. |
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|
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## `sudo meson install` now drops privileges when rebuilding targets |
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|
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It is common to install projects using sudo, which should not affect build |
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outputs but simply install the results. Unfortunately, since the ninja backend |
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updates a state file when run, it's not safe to run ninja as root at all. |
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|
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It has always been possible to carefully build with: |
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|
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``` |
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ninja && sudo meson install --no-rebuild |
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``` |
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|
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Meson now tries to be extra safe as a general solution. `sudo meson install` |
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will attempt to rebuild, but has learned to run `ninja` as the original |
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(pre-sudo or pre-doas) user, ensuring that build outputs are generated/compiled |
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as non-root. |
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|
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## `meson install` now supports user-preferred root elevation tools |
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|
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Previously, when installing a project, if any files could not be installed due |
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to insufficient permissions the install process was automatically re-run using |
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polkit. Now it prompts to ask whether that is desirable, and checks for |
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CLI-based tools such as sudo or opendoas or `$MESON_ROOT_CMD`, first. |
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|
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Meson will no longer attempt privilege elevation at all, when not running |
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interactively. |
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|
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## Support for reading options from meson.options |
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|
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Support has been added for reading options from `meson.options` instead of |
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`meson_options.txt`. These are equivalent, but not using the `.txt` extension |
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for a build file has a few advantages, chief among them many tools and text |
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editors expect a file with the `.txt` extension to be plain text files, not |
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build scripts. |
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|
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## Redirect introspection outputs to stderr |
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|
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`meson introspect` used to disable logging to `stdout` to not interfere with generated json. |
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It now redirect outputs to `stderr` to allow printing warnings to the console |
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while keeping `stdout` clean for json outputs. |
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|
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## New "none" backend |
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|
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The `--backend=none` option has been added, to configure a project that has no |
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build rules, only install rules. This avoids depending on ninja. |
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|
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## compiler.preprocess() |
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|
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Dependencies keyword argument can now be passed to `compiler.preprocess()` to |
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add include directories or compiler arguments. |
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|
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Generated sources such as custom targets are now allowed too. |
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|
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## New pybind11 custom dependency |
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|
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`dependency('pybind11')` works with pkg-config and cmake without any special |
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support, but did not handle the `pybind11-config` script. |
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|
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This is useful because the config-tool will work out of the box when pybind11 |
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is installed, but the pkg-config and cmake files are shoved into python's |
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site-packages, which makes it impossible to use in an out of the box manner. |
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|
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|
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## Allow --reconfigure and --wipe of empty builddir |
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|
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`meson setup --reconfigure builddir` and `meson setup --wipe builddir` are now |
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accepting `builddir/` to be empty or containing a previously failed setup attempt. |
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Note that in that case previously passed command line options must be repeated |
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as only a successful build saves configured options. |
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|
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This is useful for example with scripts that always repeat all options, |
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`meson setup builddir --wipe -Dfoo=bar` will always work regardless whether |
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it is a first invocation or not. |
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|
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## Allow custom install scripts to run with `--dry-run` option |
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|
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An new `dry_run` keyword is added to `meson.add_install_script()` |
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to allow a custom install script to run when meson is invoked |
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with `meson install --dry-run`. |
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|
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In dry run mode, the `MESON_INSTALL_DRY_RUN` environment variable |
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is set. |
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|
@ -1,3 +0,0 @@ |
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## `clang-cl` now accepts `cpp_std=c++20` |
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|
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Requires `clang-cl` 13 or later. |
@ -1,9 +0,0 @@ |
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## coercing values in the option() function is deprecated |
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|
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Currently code such as: |
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```meson |
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option('foo', type : 'boolean', value : 'false') |
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``` |
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works, because Meson coerces `'false'` to `false`. |
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|
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This should be avoided, and will now result in a deprecation warning. |
@ -1,5 +0,0 @@ |
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## New `declare_dependency(objects: )` argument |
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|
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A new argument to `declare_dependency` makes it possible to add objects |
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directly to executables that use an internal dependency, without going |
||||
for example through `link_whole`. |
@ -1,11 +0,0 @@ |
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## Dump devenv into file and select format |
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|
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`meson devenv --dump [<filename>]` command now takes an optional filename argument |
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to write the environment into a file instead of printing to stdout. |
||||
|
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A new `--dump-format` argument has been added to select which shell format |
||||
should be used. There are currently 3 formats supported: |
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- `sh`: Lines are in the format `VAR=/prepend:$VAR:/append`. |
||||
- `export`: Same as `sh` but with extra `export VAR` lines. |
||||
- `vscode`: Same as `sh` but without `$VAR` substitution because they do not |
||||
seems to be properly supported by vscode. |
@ -1,4 +0,0 @@ |
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## Feature objects now have an enable_auto_if method |
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|
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This performs the opposite task of the disable_auto_if method, enabling the |
||||
feature if the condition is true. |
@ -1,77 +0,0 @@ |
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## Add a FeatureOption.enable_if and .disable_if |
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|
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These are useful when features need to be constrained to pass to [[dependency]], |
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as the behavior of an `auto` and `disabled` or `enabled` feature is markedly |
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different. consider the following case: |
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|
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```meson |
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opt = get_option('feature').disable_auto_if(not foo) |
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if opt.enabled() and not foo |
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error('Cannot enable feat when foo is not also enabled') |
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endif |
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dep = dependency('foo', required : opt) |
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``` |
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|
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This could be simplified to |
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```meson |
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opt = get_option('feature').disable_if(not foo, error_message : 'Cannot enable feature when foo is not also enabled') |
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dep = dependency('foo', required : opt) |
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``` |
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|
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For a real life example, here is some code in mesa: |
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```meson |
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_llvm = get_option('llvm') |
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dep_llvm = null_dep |
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with_llvm = false |
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if _llvm.allowed() |
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dep_llvm = dependency( |
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'llvm', |
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version : _llvm_version, |
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modules : llvm_modules, |
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optional_modules : llvm_optional_modules, |
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required : ( |
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with_amd_vk or with_gallium_radeonsi or with_gallium_opencl or with_clc |
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or _llvm.enabled() |
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), |
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static : not _shared_llvm, |
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fallback : ['llvm', 'dep_llvm'], |
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include_type : 'system', |
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) |
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with_llvm = dep_llvm.found() |
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endif |
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if with_llvm |
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... |
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elif with_amd_vk and with_aco_tests |
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error('ACO tests require LLVM, but LLVM is disabled.') |
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elif with_gallium_radeonsi or with_swrast_vk |
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error('The following drivers require LLVM: RadeonSI, SWR, Lavapipe. One of these is enabled, but LLVM is disabled.') |
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elif with_gallium_opencl |
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error('The OpenCL "Clover" state tracker requires LLVM, but LLVM is disabled.') |
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elif with_clc |
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error('The CLC compiler requires LLVM, but LLVM is disabled.') |
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else |
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draw_with_llvm = false |
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endif |
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``` |
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|
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simplified to: |
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```meson |
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_llvm = get_option('llvm') \ |
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.enable_if(with_amd_vk and with_aco_tests, error_message : 'ACO tests requires LLVM') \ |
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.enable_if(with_gallium_radeonsi, error_message : 'RadeonSI requires LLVM') \ |
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.enable_if(with_swrast_vk, error_message : 'Vulkan SWRAST requires LLVM') \ |
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.enable_if(with_gallium_opencl, error_message : 'The OpenCL Clover state trackers requires LLVM') \ |
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.enable_if(with_clc, error_message : 'CLC library requires LLVM') |
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|
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dep_llvm = dependency( |
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'llvm', |
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version : _llvm_version, |
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modules : llvm_modules, |
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optional_modules : llvm_optional_modules, |
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required : _llvm, |
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static : not _shared_llvm, |
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fallback : ['llvm', 'dep_llvm'], |
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include_type : 'system', |
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) |
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with_llvm = dep_llvm.found() |
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``` |
@ -1,6 +0,0 @@ |
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## Generated objects can be passed in the `objects:` keyword argument |
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|
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In previous versions of Meson, generated objects could only be |
||||
passed as sources of a build target. This was confusing, therefore |
||||
generated objects can now be passed in the `objects:` keyword |
||||
argument as well. |
@ -1,5 +0,0 @@ |
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## The project function now supports setting the project license files |
||||
|
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This goes together with the license name. The license files can be |
||||
automatically installed via [[meson.install_dependency_manifest]], |
||||
or queried via [[meson.project_license_files]]. |
@ -1,4 +0,0 @@ |
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## A new core directory option "licensedir" is available |
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|
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This will install a dependency manifest to the specified directory, if none |
||||
is is explicitly set. |
@ -1,16 +0,0 @@ |
||||
## `sudo meson install` now drops privileges when rebuilding targets |
||||
|
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It is common to install projects using sudo, which should not affect build |
||||
outputs but simply install the results. Unfortunately, since the ninja backend |
||||
updates a state file when run, it's not safe to run ninja as root at all. |
||||
|
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It has always been possible to carefully build with: |
||||
|
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``` |
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ninja && sudo meson install --no-rebuild |
||||
``` |
||||
|
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Meson now tries to be extra safe as a general solution. `sudo meson install` |
||||
will attempt to rebuild, but has learned to run `ninja` as the original |
||||
(pre-sudo or pre-doas) user, ensuring that build outputs are generated/compiled |
||||
as non-root. |
@ -1,9 +0,0 @@ |
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## `meson install` now supports user-preferred root elevation tools |
||||
|
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Previously, when installing a project, if any files could not be installed due |
||||
to insufficient permissions the install process was automatically re-run using |
||||
polkit. Now it prompts to ask whether that is desirable, and checks for |
||||
CLI-based tools such as sudo or opendoas or `$MESON_ROOT_CMD`, first. |
||||
|
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Meson will no longer attempt privilege elevation at all, when not running |
||||
interactively. |
@ -1,7 +0,0 @@ |
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## Support for reading options from meson.options |
||||
|
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Support has been added for reading options from `meson.options` instead of |
||||
`meson_options.txt`. These are equivalent, but not using the `.txt` extension |
||||
for a build file has a few advantages, chief among them many tools and text |
||||
editors expect a file with the `.txt` extension to be plain text files, not |
||||
build scripts. |
@ -1,5 +0,0 @@ |
||||
## Redirect introspection outputs to stderr |
||||
|
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`meson introspect` used to disable logging to `stdout` to not interfere with generated json. |
||||
It now redirect outputs to `stderr` to allow printing warnings to the console |
||||
while keeping `stdout` clean for json outputs. |
@ -1,4 +0,0 @@ |
||||
## New "none" backend |
||||
|
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The `--backend=none` option has been added, to configure a project that has no |
||||
build rules, only install rules. This avoids depending on ninja. |
@ -1,6 +0,0 @@ |
||||
## compiler.preprocess() |
||||
|
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Dependencies keyword argument can now be passed to `compiler.preprocess()` to |
||||
add include directories or compiler arguments. |
||||
|
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Generated sources such as custom targets are now allowed too. |
@ -1,9 +0,0 @@ |
||||
## New pybind11 custom dependency |
||||
|
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`dependency('pybind11')` works with pkg-config and cmake without any special |
||||
support, but did not handle the `pybind11-config` script. |
||||
|
||||
This is useful because the config-tool will work out of the box when pybind11 |
||||
is installed, but the pkg-config and cmake files are shoved into python's |
||||
site-packages, which makes it impossible to use in an out of the box manner. |
||||
|
@ -1,10 +0,0 @@ |
||||
## Allow --reconfigure and --wipe of empty builddir |
||||
|
||||
`meson setup --reconfigure builddir` and `meson setup --wipe builddir` are now |
||||
accepting `builddir/` to be empty or containing a previously failed setup attempt. |
||||
Note that in that case previously passed command line options must be repeated |
||||
as only a successful build saves configured options. |
||||
|
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This is useful for example with scripts that always repeat all options, |
||||
`meson setup builddir --wipe -Dfoo=bar` will always work regardless whether |
||||
it is a first invocation or not. |
@ -1,8 +0,0 @@ |
||||
## Allow custom install scripts to run with `--dry-run` option |
||||
|
||||
An new `dry_run` keyword is added to `meson.add_install_script()` |
||||
to allow a custom install script to run when meson is invoked |
||||
with `meson install --dry-run`. |
||||
|
||||
In dry run mode, the `MESON_INSTALL_DRY_RUN` environment variable |
||||
is set. |
Loading…
Reference in new issue