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---
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short-description: Built-in options to configure project properties
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...
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# Built-in options
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Meson provides two kinds of options: [build options provided by the
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build files](Build-options.md) and built-in options that are either
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universal options, base options, compiler options.
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## Universal options
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A list of these options can be found by running `meson --help`. All
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these can be set by passing to `meson` (aka `meson setup`) in any of
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these ways: `--option=value`, `--option value`, `-Doption=value`, or
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by setting them inside `default_options` of `project()` in your `meson.build`.
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For legacy reasons `--warnlevel` is the cli argument for the `warning_level` option.
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They can also be edited after setup using `meson configure`.
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Installation options are all relative to the prefix, except:
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* When the prefix is `/usr`: `sysconfdir` defaults to `/etc`, `localstatedir` defaults to `/var`, and `sharedstatedir` defaults to `/var/lib`
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* When the prefix is `/usr/local`: `localstatedir` defaults to `/var/local`, and `sharedstatedir` defaults to `/var/local/lib`
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### Directories
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| Option | Default value | Description |
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| ------ | ------------- | ----------- |
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| prefix | see below | Installation prefix |
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| bindir | bin | Executable directory |
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| datadir | share | Data file directory |
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| includedir | include | Header file directory |
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| infodir | share/info | Info page directory |
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| libdir | see below | Library directory |
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| libexecdir | libexec | Library executable directory |
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| localedir | share/locale | Locale data directory |
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| localstatedir | var | Localstate data directory |
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| mandir | share/man | Manual page directory |
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| sbindir | sbin | System executable directory |
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| sharedstatedir | com | Architecture-independent data directory |
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| sysconfdir | etc | Sysconf data directory |
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`prefix` defaults to `C:/` on Windows, and `/usr/local` otherwise. You should always
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override this value.
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`libdir` is automatically detected based on your platform, it should be
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correct when doing "native" (build machine == host machine) compilation. For
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cross compiles meson will try to guess the correct libdir, but it may not be
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accurate, especially on Linux where different distributions have different
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defaults. Using a [cross file](Cross-compilation.md#defining-the-environment),
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particularly the paths section may be necessary.
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### Core options
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Options that are labeled "per machine" in the table are set per machine. See
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the [specifying options per machine](#Specifying-options-per-machine) section
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for details.
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| Option | Default value | Description | Is per machine | Is per subproject |
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| ------ | ------------- | ----------- | -------------- | ----------------- |
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| auto_features {enabled, disabled, auto} | auto | Override value of all 'auto' features | no | no |
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| backend {ninja, vs,<br>vs2010, vs2015, vs2017, vs2019, xcode} | ninja | Backend to use | no | no |
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| buildtype {plain, debug,<br>debugoptimized, release, minsize, custom} | debug | Build type to use | no | no |
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| debug | true | Debug | no | no |
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| default_library {shared, static, both} | shared | Default library type | no | yes |
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| errorlogs | true | Whether to print the logs from failing tests. | no | no |
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| install_umask {preserve, 0000-0777} | 022 | Default umask to apply on permissions of installed files | no | no |
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| layout {mirror,flat} | mirror | Build directory layout | no | no |
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| optimization {0, g, 1, 2, 3, s} | 0 | Optimization level | no | no |
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| pkg_config_path {OS separated path} | '' | Additional paths for pkg-config to search before builtin paths | yes | no |
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| cmake_prefix_path | [] | Additional prefixes for cmake to search before builtin paths | yes | no |
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| stdsplit | true | Split stdout and stderr in test logs | no | no |
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| strip | false | Strip targets on install | no | no |
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| unity {on, off, subprojects} | off | Unity build | no | no |
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| unity_size {>=2} | 4 | Unity file block size | no | no |
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| warning_level {0, 1, 2, 3} | 1 | Set the warning level. From 0 = none to 3 = highest | no | yes |
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| werror | false | Treat warnings as errors | no | yes |
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| wrap_mode {default, nofallback,<br>nodownload, forcefallback} | default | Wrap mode to use | no | no |
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| force_fallback_for | [] | Force fallback for those dependencies | no | no |
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<a name="build-type-options"></a>
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For setting optimization levels and toggling debug, you can either set the
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`buildtype` option, or you can set the `optimization` and `debug` options which
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give finer control over the same. Whichever you decide to use, the other will
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be deduced from it. For example, `-Dbuildtype=debugoptimized` is the same as
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`-Ddebug=true -Doptimization=2` and vice-versa. This table documents the
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two-way mapping:
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| buildtype | debug | optimization |
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| --------- | ----- | ------------ |
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| plain | false | 0 |
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| debug | true | 0 |
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| debugoptimized | true | 2 |
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| release | false | 3 |
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| minsize | true | s |
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All other combinations of `debug` and `optimization` set `buildtype` to `'custom'`.
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## Base options
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These are set in the same way as universal options, but cannot be shown in the
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output of `meson --help` because they depend on both the current platform and
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the compiler that will be selected. The only way to see them is to setup
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a builddir and then run `meson configure` on it with no options.
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The following options are available. Note that they may not be available on all
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platforms or with all compilers:
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| Option | Default value | Possible values | Description |
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| ----------- | ------------- | --------------- | ----------- |
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| b_asneeded | true | true, false | Use -Wl,--as-needed when linking |
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| b_bitcode | false | true, false | Embed Apple bitcode, see below |
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| b_colorout | always | auto, always, never | Use colored output |
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| b_coverage | false | true, false | Enable coverage tracking |
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| b_lundef | true | true, false | Don't allow undefined symbols when linking |
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| b_lto | false | true, false | Use link time optimization |
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| b_ndebug | false | true, false, if-release | Disable asserts |
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| b_pch | true | true, false | Use precompiled headers |
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| b_pgo | off | off, generate, use | Use profile guided optimization |
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| b_sanitize | none | see below | Code sanitizer to use |
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| b_staticpic | true | true, false | Build static libraries as position independent |
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| b_pie | false | true, false | Build position-independent executables (since 0.49.0)|
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| b_vscrt | from_buildtype| none, md, mdd, mt, mtd, from_buildtype | VS runtime library to use (since 0.48.0) |
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The value of `b_sanitize` can be one of: `none`, `address`, `thread`,
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`undefined`, `memory`, `address,undefined`.
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<a name="b_vscrt-from_buildtype"></a>
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The default value of `b_vscrt` is `from_buildtype`. In that case, the following
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table is used internally to pick the CRT compiler arguments based on the value
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of the `buildtype` option:
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| buildtype | Visual Studio CRT |
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| -------- | ----------------- |
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| debug | `/MDd` |
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| debugoptimized | `/MD` |
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| release | `/MD` |
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| minsize | `/MD` |
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| custom | error! |
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### Notes about Apple Bitcode support
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`b_bitcode` will pass `-fembed-bitcode` while compiling and will pass
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`-Wl,-bitcode_bundle` while linking. These options are incompatible with
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`b_asneeded`, so that option will be silently disabled.
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[Shared modules](Reference-manual.md#shared_module) will not have bitcode
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embedded because `-Wl,-bitcode_bundle` is incompatible with both `-bundle` and
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`-Wl,-undefined,dynamic_lookup` which are necessary for shared modules to work.
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## Compiler options
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Same caveats as base options above.
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The following options are available. Note that both the options themselves and
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the possible values they can take will depend on the target platform or
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compiler being used:
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| Option | Default value | Possible values | Description |
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| ------ | ------------- | --------------- | ----------- |
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| c_args | | free-form comma-separated list | C compile arguments to use |
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| c_link_args | | free-form comma-separated list | C link arguments to use |
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| c_std | none | none, c89, c99, c11, c17, c18, gnu89, gnu99, gnu11, gnu17, gnu18 | C language standard to use |
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| c_winlibs | see below | free-form comma-separated list | Standard Windows libs to link against |
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| c_thread_count | 4 | integer value ≥ 0 | Number of threads to use with emcc when using threads |
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| cpp_args | | free-form comma-separated list | C++ compile arguments to use |
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| cpp_link_args | | free-form comma-separated list | C++ link arguments to use |
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| cpp_std | none | none, c++98, c++03, c++11, c++14, c++17, <br/>c++1z, gnu++03, gnu++11, gnu++14, gnu++17, gnu++1z, <br/> vc++14, vc++17, vc++latest | C++ language standard to use |
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| cpp_debugstl | false | true, false | C++ STL debug mode |
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| cpp_eh | default | none, default, a, s, sc | C++ exception handling type |
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| cpp_rtti | true | true, false | Whether to enable RTTI (runtime type identification) |
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| cpp_thread_count | 4 | integer value ≥ 0 | Number of threads to use with emcc when using threads |
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| cpp_winlibs | see below | free-form comma-separated list | Standard Windows libs to link against |
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| fortran_std | none | [none, legacy, f95, f2003, f2008, f2018] | Fortran language standard to use |
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The default values of `c_winlibs` and `cpp_winlibs` are in compiler-specific
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argument forms, but the libraries are: kernel32, user32, gdi32, winspool,
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shell32, ole32, oleaut32, uuid, comdlg32, advapi32.
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All these `<lang>_*` options are specified per machine. See below in the
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[specifying options per machine](#Specifying-options-per-machine) section on
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how to do this in cross builds.
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When using MSVC, `cpp_eh=none` will result in no exception flags being passed,
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while the `cpp_eh=[value]` will result in `/EH[value]`.
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Since *0.51.0* `cpp_eh=default` will result in `/EHsc` on MSVC. When using
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gcc-style compilers, nothing is passed (allowing exceptions to work), while
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`cpp_eh=none` passes `-fno-exceptions`.
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Since *0.54.0* The `<lang>_thread_count` option can be used to control the
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value passed to `-s PTHREAD_POOL_SIZE` when using emcc. No other c/c++
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compiler supports this option.
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## Specifying options per machine
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Since *0.51.0*, some options are specified per machine rather than globally for
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all machine configurations. Prefixing the option with `build.` just affects the
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build machine configuration, while unprefixed just affects the host machine
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configuration, respectively. For example:
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- `build.pkg_config_path` controls the paths pkg-config will search for just
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`native: true` dependencies (build machine).
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- `pkg_config_path` controls the paths pkg-config will search for just
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`native: false` dependencies (host machine).
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This is useful for cross builds. In the native builds, build = host, and the
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unprefixed option alone will suffice.
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Prior to *0.51.0*, these options just effected native builds when specified on
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the command line, as there was no `build.` prefix. Similarly named fields in
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the `[properties]` section of the cross file would effect cross compilers, but
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the code paths were fairly different allowing differences in behavior to crop
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out.
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## Specifying options per subproject
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Since *0.54.0* `default_library` and `werror` built-in options can be defined
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per subproject. This is useful for example when building shared libraries in the
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main project, but static link a subproject, or when the main project must build
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with no warnings but some subprojects cannot.
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Most of the time this would be used either by the parent project by setting
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subproject's default_options (e.g. `subproject('foo', default_options: 'default_library=static')`),
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or by the user using the command line `-Dfoo:default_library=static`.
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The value is overriden in this order:
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- Value from parent project
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- Value from subproject's default_options if set
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- Value from subproject() default_options if set
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- Value from command line if set
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Since 0.56.0 `warning_level` can also be defined per subproject.
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