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## New method to preprocess source files
Compiler object has a new `preprocess()` method. It is supported by all C/C++
compilers. It preprocess sources without compiling them.
The preprocessor will receive the same arguments (include directories, defines,
etc) as with normal compilation. That includes for example args added with
`add_project_arguments()`, or on the command line with `-Dc_args=-DFOO`.
```meson
cc = meson.get_compiler('c')
pp_files = cc.preprocess('foo.c', 'bar.c', output: '@PLAINNAME@')
exe = executable('app', pp_files)
```
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