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Update Vala Preprocessor section in documentation. Closes: #8040 [skip ci]

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Jerry Casiano 2020-11-29 16:51:47 -05:00 committed by GitHub
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@ -252,7 +252,13 @@ keyword added to include the project VAPI directory. This is not added
automatically by `add_project_arguments()`.
### Working with the Vala Preprocessor
Passing arguments to [Vala's preprocessor](https://wiki.gnome.org/Projects/Vala/Manual/Preprocessor) requires specifying the language as `c`. For example, the following statement sets the preprocessor symbol `FUSE_USE_VERSION` to the value `26`:
Passing arguments to [Vala's preprocessor](https://wiki.gnome.org/Projects/Vala/Manual/Preprocessor) requires specifying the language as `vala`. For example, the following statement sets the preprocessor symbol `USE_FUSE`:
```meson
add_project_arguments('-D', 'USE_FUSE', language: 'vala')
```
If you need to pass an argument to the C pre-processor then specify the language as c. For example to set FUSE_USE_VERSION to 26 use:
```meson
add_project_arguments('-DFUSE_USE_VERSION=26', language: 'c')