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Comment by klodolph | Hacker News Reader

Plenty of assembly files do not use the C preprocessor. It turns out that assemblers have their own macro system.

Large projects like the Linux kernel, which are mostly C, use the preprocessor in .S files quite heavily.

Linux has hardly any .s files.

  ~/linux$ find . -name '*.s'
  ./arch/x86/kernel/asm-offsets.s
  ./kernel/bounds.s
  ./scripts/mod/devicetable-offsets.s

But there are plenty of .S files with #includes

  ~/linux$ $ find . -name '*.S' | xargs grep -l '#include' | wc -l
  1217

Edit: simplify command as suggested

FYI, `grep -l` will print just the matching filenames, no need for the sed/sort -u. `git grep` and `rg` also support this option. (I say this because I also used to overcomplicate this in my typical usage.)

Many such cases.

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