I have a meta-compiler I build w/ the kernel using a HOSTCC. This
meta-compiler parses template files and outputs c code -- this process
needs to be called from a user_command block in several directories in
the kernel. I need to pass in a -I<linux_dir> to the meta-compiler
where <linux_dir> is the path to the $(TOPDIR)/include linux headers.
In kbuild 2.4, it was really straight forward. I would use the syntax:
MY_INCLUDE := -I$(TOPDIR)/include
mycode.c: mycode.template
$(TOPDIR)/path/to/meta-compiler $(MY_INCLUDE) mycode.template
In kbuild 2.5, $(TOPDIR) is gone and AFAIK, nothing replaced it. I have
come up with a mechanism to get around this in kbuild 2.5, but it is an
ugly hack. I use the src_includelist macro, but need to strip off the
directories past the toplevel linux directory to get the right path.
Here is what I use:
MY_INCLUDE := $(shell echo $(src_includelist include) | sed -e
"s|path/to/sourcedir/||")
user_command(mycode.c
($(srcfile mycode.template) $(objfile /path/to/meta-compiler))
(set -e; $(objfile /path/to/meta-compiler) -o $(objdir) $(MY_INCLUDE)
$(srcfile mycode.template))
()
)
so, $(src_includelist include) will return the source path to the
directory I am compiling w/ include appended. and then I strip out that
sourcedir to go from /path/to/linux/source/path/to/sourcedir/include to
/path/to/linux/source/include.
Of course, I have to change the path/to/sourcedir/ in the MY_INCLUDE for
each directory's Makefile.in I am doing to reflect that directory's path
-- ugly!
there has got to be a better way to do this in kbuild 2.5...any ideas?
thanks,
-tduffy
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