On Sunday 20 March 2005 16:03, Gerd Knorr wrote: > > 1) how the user must choose what he wants (SUBARCH=i386 can be useful, > > maybe a Kconfig option would be nice - we need to choose the default > > depending on the host arch). > > That one is easy -- just use "linux32 make ...". That will switch the > personality and "uname" will return "i686" instead of "x86_64" then ;) linux32 is a SuSE specific alias like the "i386" for Fedora, right (they both alias setarch, IIRC)? > > 2) using the proper options for the tools (addressed partially by the > > patch below) > > Probably still needed. Maybe not any more with gcc4, I remember there > was some discussion among the gcc folks to make gcc default to -m64 / > -m32 depending on the current personalily. In that case the linux32 > thingy mentioned above should catch that one as well. Not sure that > actually happened. We're not going to wait gcc4, especially if it is still so memory hungry... > > 3) using the proper headers (asm-i386 instead of asm-x86_64)... Fedora > > linux32 should fix that one as well. > > > +AFLAGS += -m32 > > +CFLAGS += -m32 > > I think that can also be fixed on the make command line, with a small > wrapper script -- named make32 for example -- doing something like this: > > #!/bin/sh > exec linux32 make CC="gcc -m32" AS="as -m32" ... "$@" > > Last time I tried I ran into the problem that the glibc headers of the > x86_64 biarch compiler slightly different from the ones on a real i386 > machine, thus some #ifdefs in uml userspace code didn't work as expected > and broke the build. > > > +HOSTCFLAGS += -m32 > > +HOSTLDFLAGS += -m32 > > Not needed I think. Thats used for kconfig and other stuff which runs > on the _host_ machine (for cross compiles), thus it doesn't hurt if it > is 64 bit. I'm not sure, but that's probably needed for the userspace utilities that print out some headers (with offsets inside host proc. specific structs). -- Paolo Giarrusso, aka Blaisorblade Linux registered user n. 292729 http://www.user-mode-linux.org/~blaisorblade
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