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76 lines
2.5 KiB
76 lines
2.5 KiB
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short-description: Setting up native compilation |
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# Persistent native environments |
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New in 0.49.0 |
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Meson has [cross files for describing cross compilation environments](Cross-compilation.md), |
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for describing native environments it has equivalent "native files". |
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Natives describe the *build machine*, and can be used to override properties of |
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non-cross builds, as well as properties that are marked as "native" in a cross |
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build. |
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There are a couple of reasons you might want to use a native file to keep a |
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persistent environment: |
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* To build with a non-default native tool chain (such as clang instead of gcc) |
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* To use a non-default version of another binary, such as yacc, or llvm-config |
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## Changing native file settings |
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All of the rules about cross files and changed settings apply to native files |
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as well, see [here](Cross-compilation.md#Changing-cross-file-settings) |
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## Defining the environment |
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### Binaries |
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Currently the only use of native files is to override native binaries. This |
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includes the compilers and binaries collected with `find_program`, and those |
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used by dependencies that use a config-tool instead of pkgconfig for detection, |
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like `llvm-config` |
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```ini |
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[binaries] |
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c = '/usr/local/bin/clang' |
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cpp = '/usr/local/bin/clang++' |
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rust = '/usr/local/bin/rust' |
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llvm-config = '/usr/local/llvm-svn/bin/llvm-config' |
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``` |
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## Loading multiple native files |
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Unlike cross file, native files allow layering. More than one native file can be |
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loaded, with values from a previous file being overridden by the next. The |
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intention of this is not overriding, but to allow composing native files. |
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For example, if there is a project using C and C++, python 3.4-3.7, and LLVM |
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5-7, and it needs to build with clang 5, 6, and 7, and gcc 5.x, 6.x, and 7.x; |
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expressing all of these configurations in monolithic configurations would |
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result in 81 different native files. By layering them, it can be expressed by |
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just 12 native files. |
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## Native file locations |
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Like cross files, native files may be installed to user or system wide |
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locations, defined as: |
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- $XDG_DATA_DIRS/meson/native |
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(/usr/local/share/meson/native:/usr/share/meson/native if $XDG_DATA_DIRS is |
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undefined) |
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- $XDG_DATA_HOME/meson/native ($HOME/.local/share/meson/native if |
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$XDG_DATA_HOME is undefined) |
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The order of locations tried is as follows: |
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- A file relative to the local dir |
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- The user local location |
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- The system wide locations in order |
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These files are not intended to be shipped by distributions, unless they are |
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specifically for distribution packaging, they are mainly intended for |
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developers.
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