|
|
|
|
---
|
|
|
|
|
short-description: Built-in options to configure project properties
|
|
|
|
|
...
|
|
|
|
|
|
|
|
|
|
# Built-in options
|
|
|
|
|
|
|
|
|
|
Meson provides two kinds of options: [build options provided by the
|
|
|
|
|
build files](Build-options.md) and built-in options that are either
|
|
|
|
|
universal options, base options, compiler options.
|
|
|
|
|
|
|
|
|
|
## Universal options
|
|
|
|
|
|
|
|
|
|
A list of these options can be found by running `meson --help`. All
|
|
|
|
|
these can be set by passing `-Doption=value` to `meson` (aka `meson
|
|
|
|
|
setup`), or by setting them inside `default_options` of `project()` in
|
|
|
|
|
your `meson.build`. Some options can also be set by `--option=value`,
|
|
|
|
|
or `--option value`--- a list is shown by running `meson setup
|
|
|
|
|
--help`.
|
|
|
|
|
|
|
|
|
|
For legacy reasons `--warnlevel` is the cli argument for the
|
|
|
|
|
`warning_level` option.
|
|
|
|
|
|
|
|
|
|
They can also be edited after setup using `meson configure
|
|
|
|
|
-Doption=value`.
|
|
|
|
|
|
|
|
|
|
Installation options are all relative to the prefix, except:
|
|
|
|
|
|
|
|
|
|
* When the prefix is `/usr`: `sysconfdir` defaults to `/etc`,
|
|
|
|
|
* `localstatedir` defaults to `/var`, and `sharedstatedir` defaults to
|
|
|
|
|
* `/var/lib` When the prefix is `/usr/local`: `localstatedir` defaults
|
|
|
|
|
* to `/var/local`, and `sharedstatedir` defaults to `/var/local/lib`
|
|
|
|
|
|
|
|
|
|
### Directories
|
|
|
|
|
|
|
|
|
|
| Option | Default value | Description |
|
|
|
|
|
| ------ | ------------- | ----------- |
|
|
|
|
|
| prefix | see below | Installation prefix |
|
|
|
|
|
| bindir | bin | Executable directory |
|
|
|
|
|
| datadir | share | Data file directory |
|
|
|
|
|
| includedir | include | Header file directory |
|
|
|
|
|
| infodir | share/info | Info page directory |
|
|
|
|
|
| libdir | see below | Library directory |
|
|
|
|
|
| libexecdir | libexec | Library executable directory |
|
|
|
|
|
| localedir | share/locale | Locale data directory |
|
|
|
|
|
| localstatedir | var | Localstate data directory |
|
|
|
|
|
| mandir | share/man | Manual page directory |
|
|
|
|
|
| sbindir | sbin | System executable directory |
|
|
|
|
|
| sharedstatedir | com | Architecture-independent data directory |
|
|
|
|
|
| sysconfdir | etc | Sysconf data directory |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
`prefix` defaults to `C:/` on Windows, and `/usr/local` otherwise. You
|
|
|
|
|
should always override this value.
|
|
|
|
|
|
|
|
|
|
`libdir` is automatically detected based on your platform, it should
|
|
|
|
|
be correct when doing "native" (build machine == host machine)
|
|
|
|
|
compilation. For cross compiles Meson will try to guess the correct
|
|
|
|
|
libdir, but it may not be accurate, especially on Linux where
|
|
|
|
|
different distributions have different defaults. Using a [cross
|
|
|
|
|
file](Cross-compilation.md#defining-the-environment), particularly the
|
|
|
|
|
paths section may be necessary.
|
|
|
|
|
|
|
|
|
|
### Core options
|
|
|
|
|
|
|
|
|
|
Options that are labeled "per machine" in the table are set per
|
|
|
|
|
machine. See the [specifying options per
|
|
|
|
|
machine](#specifying-options-per-machine) section for details.
|
|
|
|
|
|
|
|
|
|
| Option | Default value | Description | Is per machine | Is per subproject |
|
|
|
|
|
| ------ | ------------- | ----------- | -------------- | ----------------- |
|
|
|
|
|
| auto_features {enabled, disabled, auto} | auto | Override value of all 'auto' features | no | no |
|
|
|
|
|
| backend {ninja, vs,<br>vs2010, vs2015, vs2017, vs2019, xcode} | ninja | Backend to use | no | no |
|
|
|
|
|
| buildtype {plain, debug,<br>debugoptimized, release, minsize, custom} | debug | Build type to use | no | no |
|
|
|
|
|
| debug | true | Debug | no | no |
|
|
|
|
|
| default_library {shared, static, both} | shared | Default library type | no | yes |
|
|
|
|
|
| errorlogs | true | Whether to print the logs from failing tests. | no | no |
|
|
|
|
|
| install_umask {preserve, 0000-0777} | 022 | Default umask to apply on permissions of installed files | no | no |
|
|
|
|
|
| layout {mirror,flat} | mirror | Build directory layout | no | no |
|
|
|
|
|
| optimization {0, g, 1, 2, 3, s} | 0 | Optimization level | no | no |
|
|
|
|
|
| pkg_config_path {OS separated path} | '' | Additional paths for pkg-config to search before builtin paths | yes | no |
|
|
|
|
|
| cmake_prefix_path | [] | Additional prefixes for cmake to search before builtin paths | yes | no |
|
|
|
|
|
| stdsplit | true | Split stdout and stderr in test logs | no | no |
|
|
|
|
|
| strip | false | Strip targets on install | no | no |
|
|
|
|
|
| unity {on, off, subprojects} | off | Unity build | no | no |
|
|
|
|
|
| unity_size {>=2} | 4 | Unity file block size | no | no |
|
|
|
|
|
| warning_level {0, 1, 2, 3} | 1 | Set the warning level. From 0 = none to 3 = highest | no | yes |
|
|
|
|
|
| werror | false | Treat warnings as errors | no | yes |
|
|
|
|
|
| wrap_mode {default, nofallback,<br>nodownload, forcefallback, nopromote} | default | Wrap mode to use | no | no |
|
|
|
|
|
| force_fallback_for | [] | Force fallback for those dependencies | no | no |
|
|
|
|
|
|
|
|
|
|
<a name="build-type-options"></a> For setting optimization levels and
|
|
|
|
|
toggling debug, you can either set the `buildtype` option, or you can
|
|
|
|
|
set the `optimization` and `debug` options which give finer control
|
|
|
|
|
over the same. Whichever you decide to use, the other will be deduced
|
|
|
|
|
from it. For example, `-Dbuildtype=debugoptimized` is the same as
|
|
|
|
|
`-Ddebug=true -Doptimization=2` and vice-versa. This table documents
|
|
|
|
|
the two-way mapping:
|
|
|
|
|
|
|
|
|
|
| buildtype | debug | optimization |
|
|
|
|
|
| --------- | ----- | ------------ |
|
|
|
|
|
| plain | false | 0 |
|
|
|
|
|
| debug | true | 0 |
|
|
|
|
|
| debugoptimized | true | 2 |
|
|
|
|
|
| release | false | 3 |
|
|
|
|
|
| minsize | true | s |
|
|
|
|
|
|
|
|
|
|
All other combinations of `debug` and `optimization` set `buildtype` to `'custom'`.
|
|
|
|
|
|
|
|
|
|
## Base options
|
|
|
|
|
|
|
|
|
|
These are set in the same way as universal options, either by
|
|
|
|
|
`-Doption=value`, or by setting them inside `default_options` of
|
|
|
|
|
`project()` in your `meson.build`. However, they cannot be shown in
|
|
|
|
|
the output of `meson --help` because they depend on both the current
|
|
|
|
|
platform and the compiler that will be selected. The only way to see
|
|
|
|
|
them is to setup a builddir and then run `meson configure` on it with
|
|
|
|
|
no options.
|
|
|
|
|
|
|
|
|
|
The following options are available. Note that they may not be
|
|
|
|
|
available on all platforms or with all compilers:
|
|
|
|
|
|
|
|
|
|
| Option | Default value | Possible values | Description |
|
|
|
|
|
|---------------|----------------|------------------------------------------------------------------|-------------------------------------------------------------------------------|
|
|
|
|
|
| b_asneeded | true | true, false | Use -Wl,--as-needed when linking |
|
|
|
|
|
| b_bitcode | false | true, false | Embed Apple bitcode, see below |
|
|
|
|
|
| b_colorout | always | auto, always, never | Use colored output |
|
|
|
|
|
| b_coverage | false | true, false | Enable coverage tracking |
|
|
|
|
|
| b_lundef | true | true, false | Don't allow undefined symbols when linking |
|
|
|
|
|
| b_lto | false | true, false | Use link time optimization |
|
|
|
|
|
| b_lto_threads | 0 | Any integer* | Use multiple threads for lto. *(Added in 0.57.0)* |
|
|
|
|
|
| b_lto_mode | default | default, thin | Select between lto modes, thin and default. *(Added in 0.57.0)* |
|
|
|
|
|
| b_ndebug | false | true, false, if-release | Disable asserts |
|
|
|
|
|
| b_pch | true | true, false | Use precompiled headers |
|
|
|
|
|
| b_pgo | off | off, generate, use | Use profile guided optimization |
|
|
|
|
|
| b_sanitize | none | see below | Code sanitizer to use |
|
|
|
|
|
| b_staticpic | true | true, false | Build static libraries as position independent |
|
|
|
|
|
| b_pie | false | true, false | Build position-independent executables (since 0.49.0) |
|
|
|
|
|
| b_vscrt | from_buildtype | none, md, mdd, mt, mtd, from_buildtype, static_from_buildtype | VS runtime library to use (since 0.48.0) (static_from_buildtype since 0.56.0) |
|
|
|
|
|
|
|
|
|
|
The value of `b_sanitize` can be one of: `none`, `address`, `thread`,
|
|
|
|
|
`undefined`, `memory`, `address,undefined`.
|
|
|
|
|
|
|
|
|
|
* < 0 means disable, == 0 means automatic selection, > 0 sets a specific number to use
|
|
|
|
|
|
|
|
|
|
LLVM supports `thin` lto, for more discussion see [LLVM's documentation](https://clang.llvm.org/docs/ThinLTO.html)
|
|
|
|
|
|
|
|
|
|
<a name="b_vscrt-from_buildtype"></a>
|
|
|
|
|
The default value of `b_vscrt` is `from_buildtype`. The following table is
|
|
|
|
|
used internally to pick the CRT compiler arguments for `from_buildtype` or
|
|
|
|
|
`static_from_buildtype` *(since 0.56)* based on the value of the `buildtype`
|
|
|
|
|
option:
|
|
|
|
|
|
|
|
|
|
| buildtype | from_buildtype | static_from_buildtype |
|
|
|
|
|
| -------- | -------------- | --------------------- |
|
|
|
|
|
| debug | `/MDd` | `/MTd` |
|
|
|
|
|
| debugoptimized | `/MD` | `/MT` |
|
|
|
|
|
| release | `/MD` | `/MT` |
|
|
|
|
|
| minsize | `/MD` | `/MT` |
|
|
|
|
|
| custom | error! | error! |
|
|
|
|
|
|
|
|
|
|
### Notes about Apple Bitcode support
|
|
|
|
|
|
|
|
|
|
`b_bitcode` will pass `-fembed-bitcode` while compiling and will pass
|
|
|
|
|
`-Wl,-bitcode_bundle` while linking. These options are incompatible
|
|
|
|
|
with `b_asneeded`, so that option will be silently disabled.
|
|
|
|
|
|
|
|
|
|
[Shared modules](Reference-manual.md#shared_module) will not have
|
|
|
|
|
bitcode embedded because `-Wl,-bitcode_bundle` is incompatible with
|
|
|
|
|
both `-bundle` and `-Wl,-undefined,dynamic_lookup` which are necessary
|
|
|
|
|
for shared modules to work.
|
|
|
|
|
|
|
|
|
|
## Compiler options
|
|
|
|
|
|
|
|
|
|
Same caveats as base options above.
|
|
|
|
|
|
|
|
|
|
The following options are available. They can be set by passing
|
|
|
|
|
`-Doption=value` to `meson`. Note that both the options themselves and
|
|
|
|
|
the possible values they can take will depend on the target platform
|
|
|
|
|
or compiler being used:
|
|
|
|
|
|
|
|
|
|
| Option | Default value | Possible values | Description |
|
|
|
|
|
| ------ | ------------- | --------------- | ----------- |
|
|
|
|
|
| c_args | | free-form comma-separated list | C compile arguments to use |
|
|
|
|
|
| c_link_args | | free-form comma-separated list | C link arguments to use |
|
|
|
|
|
| c_std | none | none, c89, c99, c11, c17, c18, c2x, gnu89, gnu99, gnu11, gnu17, gnu18, gnu2x | C language standard to use |
|
|
|
|
|
| c_winlibs | see below | free-form comma-separated list | Standard Windows libs to link against |
|
|
|
|
|
| c_thread_count | 4 | integer value ≥ 0 | Number of threads to use with emcc when using threads |
|
|
|
|
|
| cpp_args | | free-form comma-separated list | C++ compile arguments to use |
|
|
|
|
|
| cpp_link_args | | free-form comma-separated list | C++ link arguments to use |
|
|
|
|
|
| cpp_std | none | none, c++98, c++03, c++11, c++14, c++17, c++20 <br/>c++2a, c++1z, gnu++03, gnu++11, gnu++14, gnu++17, gnu++1z, <br/> gnu++2a, gnu++20, vc++14, vc++17, vc++latest | C++ language standard to use |
|
|
|
|
|
| cpp_debugstl | false | true, false | C++ STL debug mode |
|
|
|
|
|
| cpp_eh | default | none, default, a, s, sc | C++ exception handling type |
|
|
|
|
|
| cpp_rtti | true | true, false | Whether to enable RTTI (runtime type identification) |
|
|
|
|
|
| cpp_thread_count | 4 | integer value ≥ 0 | Number of threads to use with emcc when using threads |
|
|
|
|
|
| cpp_winlibs | see below | free-form comma-separated list | Standard Windows libs to link against |
|
|
|
|
|
| fortran_std | none | [none, legacy, f95, f2003, f2008, f2018] | Fortran language standard to use |
|
|
|
|
|
| cuda_ccbindir | | filesystem path | CUDA non-default toolchain directory to use (-ccbin) *(Added in 0.57.1)* |
|
|
|
|
|
|
|
|
|
|
The default values of `c_winlibs` and `cpp_winlibs` are in
|
|
|
|
|
compiler-specific argument forms, but the libraries are: kernel32,
|
|
|
|
|
user32, gdi32, winspool, shell32, ole32, oleaut32, uuid, comdlg32,
|
|
|
|
|
advapi32.
|
|
|
|
|
|
|
|
|
|
All these `<lang>_*` options are specified per machine. See below in
|
|
|
|
|
the [specifying options per machine](#specifying-options-per-machine)
|
|
|
|
|
section on how to do this in cross builds.
|
|
|
|
|
|
|
|
|
|
When using MSVC, `cpp_eh=none` will result in no exception flags being
|
|
|
|
|
passed, while the `cpp_eh=[value]` will result in `/EH[value]`. Since
|
|
|
|
|
*0.51.0* `cpp_eh=default` will result in `/EHsc` on MSVC. When using
|
|
|
|
|
gcc-style compilers, nothing is passed (allowing exceptions to work),
|
|
|
|
|
while `cpp_eh=none` passes `-fno-exceptions`.
|
|
|
|
|
|
|
|
|
|
Since *0.54.0* The `<lang>_thread_count` option can be used to control
|
|
|
|
|
the value passed to `-s PTHREAD_POOL_SIZE` when using emcc. No other
|
|
|
|
|
c/c++ compiler supports this option.
|
|
|
|
|
|
|
|
|
|
## Specifying options per machine
|
|
|
|
|
|
|
|
|
|
Since *0.51.0*, some options are specified per machine rather than
|
|
|
|
|
globally for all machine configurations. Prefixing the option with
|
|
|
|
|
`build.` just affects the build machine configuration, while
|
|
|
|
|
unprefixed just affects the host machine configuration, respectively.
|
|
|
|
|
For example:
|
|
|
|
|
|
|
|
|
|
- `build.pkg_config_path` controls the paths pkg-config will search
|
|
|
|
|
for just `native: true` dependencies (build machine).
|
|
|
|
|
|
|
|
|
|
- `pkg_config_path` controls the paths pkg-config will search for
|
|
|
|
|
just `native: false` dependencies (host machine).
|
|
|
|
|
|
|
|
|
|
This is useful for cross builds. In the native builds, build = host,
|
|
|
|
|
and the unprefixed option alone will suffice.
|
|
|
|
|
|
|
|
|
|
Prior to *0.51.0*, these options just effected native builds when
|
|
|
|
|
specified on the command line, as there was no `build.` prefix.
|
|
|
|
|
Similarly named fields in the `[properties]` section of the cross file
|
|
|
|
|
would effect cross compilers, but the code paths were fairly different
|
|
|
|
|
allowing differences in behavior to crop out.
|
|
|
|
|
|
|
|
|
|
## Specifying options per subproject
|
|
|
|
|
|
|
|
|
|
Since *0.54.0* `default_library` and `werror` built-in options can be
|
|
|
|
|
defined per subproject. This is useful for example when building
|
|
|
|
|
shared libraries in the main project, but static link a subproject, or
|
|
|
|
|
when the main project must build with no warnings but some subprojects
|
|
|
|
|
cannot.
|
|
|
|
|
|
|
|
|
|
Most of the time this would be used either by the parent project by
|
|
|
|
|
setting subproject's default_options (e.g. `subproject('foo',
|
|
|
|
|
default_options: 'default_library=static')`), or by the user using the
|
|
|
|
|
command line `-Dfoo:default_library=static`.
|
|
|
|
|
|
|
|
|
|
The value is overridden in this order:
|
|
|
|
|
- Value from parent project
|
|
|
|
|
- Value from subproject's default_options if set
|
|
|
|
|
- Value from subproject() default_options if set
|
|
|
|
|
- Value from command line if set
|
|
|
|
|
|
|
|
|
|
Since 0.56.0 `warning_level` can also be defined per subproject.
|
