cexp makefile

[Till Straumann]

There is a tool 'ldep' that generates the built-in symbol table
in source form ('.c' file) as a by-product of library dependency
analysis.

I use rules (allsyms.c is my symbol table; note that rules in this message
are simplified)

# -lxxx -lyyy  -> o-optimize/libxxx.nm o-optimize/libyyy.nm
NMFILES=$(patsubst %.a,$(ARCH)/%.nm,$(sort $(patsubst -l%,lib%.a,$(filter -l%,$(ALL_LIBS)))))

# analyze library interdependencies and remove unwanted pieces;
# generate (-C) C file containing a symbol table definition for inclusion
# with cexp. The references from this code will trigger linkage of the
# desired library pieces...
$(ARCH)/allsyms.c: $(NMFILES)
	$(LDEP) -C -F $(addprefix -o,$(NMFILES)) $(addprefix -x,$(EXCLUDE_LISTS))

# generate 'nm' file from library for input to ldep 
$(ARCH)/%.nm: %.a
	$(NM) -g -fposix $^ >$@

The idea is that you list all libraries you want to incorporate
into your application in 'ALL_LIBS'.

ldep then analyzes the library interdependencies and recursively
removes
  a) 'dangling' unresolved symbol references
  b) pieces you want to exclude from your application explicitely
     (as specified in EXCLUDE_LISTS).

More information about LDEP, it's source code and a full RTEMS Makefile
is distributed with GeSys (generic system application) available from

http://www.slac.stanford.edu/~strauman/rtems/software.html

HTH
-- Till

On Mon, 2006-08-07 at 15:21 -0700, Allan Hessenflow wrote:
> Are there any example makefiles that use the RTEMS application makefile
> framework for building an application including cexp with a built-in
>  symbol table?  I can build an app that works with some manual steps,
>  but am having trouble seeing how to fit the symbol table build into
>  the RTEMS application makefiles in a reasonably clean manner.
> 
> allan
>