building linux kernel on cygwin (and MacOSX) (was: crosstools cygwinwoes)

[Dan Kegel <dank at kegel dot com>]

bertrand marquis wrote:
> > My failure from 3.3.3 is slightly different.
> >
> > $ make menuconfig
> >  HOSTCC  scripts/basic/fixdep
> >  HOSTCC  scripts/basic/split-include
> >  HOSTCC  scripts/basic/docproc
> >  HOSTLD  scripts/kconfig/mconf
> > collect2: ld terminated with signal 11 [Segmentation fault], core dumped
> > scripts/kconfig/libkconfig.so(.text+0x0):crtstuff.c: multiple 
> > definition of
> > `___do_sjlj_init'
> > /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/crtbegin.o(.text+0x0):crtstuff.c:
> > first defined here
> > make[1]: *** [scripts/kconfig/mconf] Error 1
> > make: *** [menuconfig] Error 2
>
>    I had the same problem last week. It seems that mconf is linked using 
> a .so file. I had to change this to link mconf with the .o file. I also 
> had problems because to compile the kconfg_elk or something like that 
> program in script/, we need elf.h header. I solve that using the libelf 
> to have a elf.h under cygwin.

I assume you mean the one linked to from http://www.gnu.org/directory/libs/misc/libelf.html
(the one in elfutils from http://people.redhat.com/drepper/
is problematic because (a) the author provides no source tarball,
(b) doesn't release the whole package under a free license.)

Maybe you could package up libelf as a cygwin package and contribute it to the cygwin project.
That would be quite helpful.

> here is what i'm using:
>
> gcc 3.2.3
> glibc 2.3.2
> binutils 2.14
> kernel 2.6.7 (but the patch is also good for 2.6.6)
>
> here is the patch i'm trying to use now, i'm still under progress for 
> kernel 2.6.7 so i don't know if everything else will work:
>
> --- linux-x86-2.6.7/scripts/kconfig/Makefile    2004-06-16 
> 07:20:26.000000000 +0200
> +++ linux-x86-2.6.7.cyg/linux-x86-2.6.7/scripts/kconfig/Makefile    
> 2004-06-24 10:39:18.824400000 +0200
> @@ -68,8 +68,8 @@
> libkconfig-objs := zconf.tab.o
>
> host-progs    := conf mconf qconf gconf
> -conf-objs    := conf.o  libkconfig.so
> -mconf-objs    := mconf.o libkconfig.so
> +conf-objs    := conf.o  libkconfig.o
> +mconf-objs    := mconf.o zconf.tab.o
>
> ifeq ($(MAKECMDGOALS),xconfig)
>     qconf-target := 1
> @@ -89,11 +89,12 @@
> endif
>
> clean-files    := libkconfig.so lkc_defs.h qconf.moc .tmp_qtcheck \
> -           .tmp_gtkcheck zconf.tab.c zconf.tab.h lex.zconf.c
> +           .tmp_gtkcheck zconf.tab.c zconf.tab.h lex.zconf.c libkconfig.o
>
> # generated files seem to need this to find local include files
> HOSTCFLAGS_lex.zconf.o    := -I$(src)
> HOSTCFLAGS_zconf.tab.o    := -I$(src)
> +HOSTCFLAGS_libkconfig.o    := -I$(src)
>
> HOSTLOADLIBES_qconf    = -L$(QTLIBPATH) -Wl,-rpath,$(QTLIBPATH) 
> -l$(QTLIB) -ldl
> HOSTCXXFLAGS_qconf.o    = -I$(QTDIR)/include
> @@ -101,6 +102,9 @@
> HOSTLOADLIBES_gconf    = `pkg-config gtk+-2.0 gmodule-2.0 libglade-2.0 
> --libs`
> HOSTCFLAGS_gconf.o    = `pkg-config gtk+-2.0 gmodule-2.0 libglade-2.0 
> --cflags`
>
> +$(obj)/libkconfig.c: $(obj)/zconf.tab.c $(obj)/lex.zconf.c
> +    cp $< $@
> +
> $(obj)/conf.o $(obj)/mconf.o $(obj)/qconf.o $(obj)/gconf.o: 
> $(obj)/zconf.tab.h
>
> $(obj)/qconf.o: $(obj)/.tmp_qtcheck

I can't try that myself at the moment, but it looks reasonable,
and non-cygwin-specific.
Maybe someone could verify this helps Mac OS X build the linux
kernel, and doesn't hurt building it on Linux?
- Dan

--
My technical stuff: http://kegel.com
My politics: see http://www.misleader.org for examples of why I'm for regime change

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