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# Reference tables
## Compiler ids
These are return values of the `get_id` method in a compiler object.
| Value | Compiler family |
| ----- | ---------------- |
| gcc | The GNU Compiler Collection |
| clang | The Clang compiler |
| msvc | Microsoft Visual Studio |
| intel | Intel compiler |
| llvm | LLVM-based compiler (Swift, D) |
| mono | Xamarin C# compiler |
| dmd | D lang reference compiler |
| rustc | Rust compiler |
| valac | Vala compiler |
| pathscale | The Pathscale Fortran compiler |
| pgi | The Portland Fortran compiler |
| sun | Sun Fortran compiler |
| g95 | The G95 Fortran compiler |
| open64 | The Open64 Fortran Compiler |
| nagfor | The NAG Fortran compiler |
## Script environment variables
| Value | Comment |
| ----- | ------- |
| MESON_SOURCE_ROOT | Absolute path to the source dir |
| MESON_BUILD_ROOT | Absolute path to the build dir |
| MESONINTROSPECT | Command to run to run the introspection command, may be of the form `python /path/to/meson introspect`, user is responsible for splitting the path if necessary. |
| MESON_SUBDIR | Current subdirectory, only set for `run_command` |
## CPU families
These are returned by the `cpu_family` method of `build_machine`,
`host_machine` and `target_machine`. For cross compilation they are
set in the cross file.
| Value | Comment |
| ----- | ------- |
| x86 | 32 bit x86 processor |
| x86_64 | 64 bit x86 processor |
| arm | 32 bit ARM processor |
Any cpu family not listed in the above list is not guaranteed to
remain stable in future releases.
## Operating system names
These are provided by the `.system()` method call.
| Value | Comment |
| ----- | ------- |
| linux | |
| darwin | Either OSX or iOS |
| windows | Any version of Windows |
| cygwin | The Cygwin environment for Windows |
Any string not listed above is not guaranteed to remain stable in
future releases.
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