Re: Preventing compilation of a C file

Magnus Therning wrote:

> I have run into some interesting behaviour I think. I have a rule like
> this:
> 
>  opcodes.h : vdbe.c
>          :print /* Automatically generated file.  Do not edit */ >!  $(target)
> 	 :sys grep '^case OP_' vdbe.c | \
> 	   sed -e 's/://' | \
>            awk '{printf "#define %-30s %3d\n", $$2, ++cnt}' >> $(target)
> 
> The result of running aap on this is:
> 
>  Aap: Creating directory "/home/magnus/prog/tmp/sqlite/src/build-Linux2_6_7_1_k7"
>  Aap:  cc       -MM vdbe.c > build-Linux2_6_7_1_k7/vdbe.c.aap
>  In file included from vdbe.c:48:
>  sqliteInt.h:19:20: config.h: No such file or directory
>  sqliteInt.h:20:21: sqlite3.h: No such file or directory
>  sqliteInt.h:22:19: parse.h: No such file or directory
>  Aap: Error in recipe "/usr/lib/aap/default.aap" line 161: :update failed for "config.h"
> 
> Why does aap insist on compiling vdbe.c?
> How do I prevent it from doing so?

It is not compiling the file, but it does go through the preprocessor.
This is required to find dependencies on included files.

However, you appear to use "vdbe.c" by itself, thus it should not matter
what files are included.  In that case you can disable the dependency
check:

   opcodes.h : vdbe.c {autodepend = off}

This is explained at the start of Chapter 29.

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