Is there a tool to remove the C source code in an Undefined Macro?

Question

I am reading linux kernel source code recently.

The source code use too many Macros to divide files, functions, variables.

But a lot of these Macro are ignored by me. The files, functions, variables depend on the Macro I ignore create too much disturbance.

Is there any method to remove all these files, functions, variables depend on Undefined Macros in the source project?

Thanks a lot.

Why do you want to remove all this... The source code contains them for a good reason (make the kernel working in all configurations). If you want to do some static analysis of the kernel consider also http://coccinelle.lip6.fr/ & http://gcc-melt.org/ — Basile Starynkevitch, Aug 15 '13 at 03:47
Possible [duplicate](http://stackoverflow.com/questions/3916979/gcc-preprocessor) — Eddy_Em, Aug 15 '13 at 04:33

wenjianhn · Accepted Answer · 2018-05-16T02:00:35.437

0

make dir/file.i  - Build the form of preprocessed source code only

e.g.

make kernel/locking/spinlock.i
cat kernel/locking/spinlock.i

edited May 16 '18 at 02:00

answered May 11 '18 at 07:00

wenjianhn

Could you describe what your answer does? – F_SO_K May 11 '18 at 08:44
Out of pure curiosity: Do you have a source for this syntax? I have not seen it in the man page of make. – user7427029 Oct 31 '22 at 10:28
@user7427029 the feature is supported by the kernel project instead of make – wenjianhn Nov 01 '22 at 12:14

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