Re: Patch: automatic dependencies for gcc

[Basile STARYNKEVITCH <basile@starynkevitch.net>]

Tom Tromey wrote:
>>>>>> "Richard" == Richard Guenther <richard.guenther@gmail.com> writes:
> 
> Richard> It seems that changes in builtins.def or builtin-types.def do
> Richard> not cause re-builds of their dependencies.
> 
> A while back I was thinking, "I wish I got more response to my patches".
> I'm kind of regretting that now.


Back to the subject of automatic dependencies for GCC my MELT branch
http://gcc.gnu.org/wiki/MiddleEndLispTranslator has similar needs.

See http://gcc.gnu.org/ml/gcc/2008-03/msg00839.html
http://gcc.gnu.org/ml/gcc/2008-03/msg00810.html
http://gcc.gnu.org/ml/gcc/2008-03/msg00668.html
http://gcc.gnu.org/ml/gcc/2008-03/msg00549.html
http://gcc.gnu.org/ml/gcc/2008-03/msg00524.html
http://gcc.gnu.org/ml/gcc/2008-03/msg00152.html
http://gcc.gnu.org/ml/gcc/2008-02/msg00682.html
http://gcc.gnu.org/ml/gcc/2008-02/msg00632.html
http://gcc.gnu.org/ml/gcc/2008-02/msg00419.html
and other messages in the referenced threads

MELT is able to generate C code and to tldl_dlopenext (almost like 
dlopen-ing a dynamic library) the binary dynamically loadable stuff (a 
*.so ELF shared object on Linux & Solaris...) obtained from the 
generated code. Notice that this code generation and dynamic loading may 
happen within cc1 (for some peculiar long-lasting passes and compile flags).

Each such generated C code needs include files internal to GCC. They are 
all wrapped in one particular include gcc/run-basilys.h which is the 
only #include in such generated C code.

So I need to copy all the files needed by this gcc/run-basilys.h in a 
suitable place. At the moment I have the following (near the end of) my 
gcc/Makefile.in (in MELT branch):

#########################
# we want to generate all the direct (non system) dependencies of 
#run-basilys.h
# the following should work if $(CC) is some recent version of GCC 
#(probably >= 4.x)

# we first generate the make-dependencies using -MMD
# this should write into run-basilys.d some stuff like
## run-basilys-deps: srcdir.../gcc/run-basilys.h  config.h auto-host.h ....
# with the srcdir... replaced by the source directory
# however, there are also config/ files in the dependency list
# config/ files should be handled specially since they are the only 
#include-d files
# which are not flat, ie in a subdirectory, like 
srcdir.../gcc/config/i386/x86-64.h
# there is also a dependency on tm.h (in objdir) which contains stuff 
like #include "config/i386/x86-64.h"
run-basilys.d: run-basilys.h \
    $(CONFIG_H) $(SYSTEM_H) $(TIMEVAR_H) $(TM_H)  $(TREE_H)  $(GGC_H)  \
    tree-pass.h basilys.h gt-basilys.h
## perhaps this should really use depcomp, because this works only if
## CC is some gcc 4.x since it use the precompiled headers feature
	$(CC) -MT run-basilys-deps -MMD -MF $@ $(ALL_CFLAGS) $(ALL_CPPFLAGS) $< 
-o run-basilys.h.gch

.PHONY: run-basilys-deps
## the include below defines the dependencies of run-basilys-deps
## included file run-basilys.d is generated above
-include run-basilys.d


## copy all the file in the dependency of run-basilys-deps into 
#$(melt_build_include_dir)
## but handle the $(srcdir)/config/ files specially by copying them 
#within a config/ directory
run-basilys-deps:
#	echo '***' IN run-basilys-deps TARGET '***'
	$(mkinstalldirs) $(melt_build_include_dir); \
	for f in $^ ; do \
	  cf=`echo $$f | sed 
"s:$(srcdir)/config/:$(melt_build_include_dir)/config/:"`; \
	  if [ "x$$f" != "x$$cf" ] ;  then  \
	    $(mkinstalldirs) `dirname $$cf` ; \
	    cp -p $$f $$cf ; \
	  else  \
	    cp -p $$f $(melt_build_include_dir)/ ; \
		fi; \
	done
########################

it sort of works on my Debian system, but it is definitely not 
satisfactory (it probably should break on any non Linux/Gcc system). 
Maybe using depcomp could help, but I don't know how.

Comments and suggestions (or even patches in to the latest of MELT 
branch) are appreciated.

Regards


-- 
Basile STARYNKEVITCH         http://starynkevitch.net/Basile/
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