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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)
+```