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The basic idea is to replace
gcc ... file.c ...
with
gcc -E ... file.c ... -o preproc.c
dietc preproc.c > diet.c
pass1 diet.c > diet.c
pass2 diet.c > diet.c
...
gcc ... diet.c ...
To assist with this, we provide `scripts/dietcc`, which provides a drop-in
replacement for `gcc` that can run your patches. In your build scripts, simply
replace `gcc` with the path of `dietcc`.
You can insert your own compilation pass into dietcc; read its Python source
for examples.
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