[CMake] how to add capability to generate preprocessed and not-yet-compiled files ?

[Alexander Neundorf]

-------- Original-Nachricht --------
Von: Brad King <brad.king at kitware.com>

> Alexander Neundorf wrote:
> > Hi,
> > 
> > it would be nice if it would be possible to have for each object file
> also a target which only preprocesses the file and one which
> preprocesses and compiles, but not assembles the file (so that you get
> the assembler code).
> > 
> > Is there a way to do this with macros ? 
> > I almost think this would have to be done in cmake itself. Probably
> somewhere where the object rules are created additionally for each object the
> same rule but with "-E" instead of "-c" would have to be created. It
> wouldn't be required to be executed on all, just on direct invocation:
> > make foo.o/pre
> > make foo.o/as
> > 
> > 
> > What do you think about this ?
> > Would you accept a patch ?
> 
> Look in Modules/CMakeCInformation.cmake for the variable 
> CMAKE_C_COMPILE_OBJECT.  Other modules in the Platform directory set it 
> also.  Just duplicate the variable with one called 
> CMAKE_C_PREPROCESS_OBJECT and then setup 
> cmLocalUnixMakefileGenerator3.cxx to create rules with ".E" extensions 
> instead of ".o".  You should be able to locate places that lookup 
> *_COMPILE_OBJECT vars.  See Modules/CMakeCXXInformation.cmake for the 
> C++ version.

Ok, yesterday I had a look at it and managed to get the rules for preprocessed files produced.
It ended up in cmMakefileTargetGenerator::WriteObjectBuildFile().
Problem: the rule was created in builddir/CMakeFiles/target.dir/build.make, but not in builddir/Makefile, so I had to enter "make -f CMakeFiles/target.dir/build.make main.o.E".
What do I have to do to have this rule also appear in the Makefile in the build dir ?

Bye
Alex

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