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On Wed, 15 Mar 2000, Thunder Scientific Corporation wrote: > My stochastic sojourn in cross-compiler land. > > I would like to thank all the readers of this list for their kind help and > multiple suggestions to get me out of my trouble here. For several weeks > now I've been trying to build a cross compiler for an i486 architecture > which would use newlib for its run time library as opposed to the standard > libc. Alas, nothing has worked. I have come to the conclusion that, > seemingly for this case alone, the GNU build scripts are seriously broken. > Download RTEMS from http://www.rtems.com. It has built scripts which work and you cna use it as an example. I would also suppose using RTEMS as RTOS on your project - it is in reasonably good shape. Thanks, Aleksey > Many readers have responded to me asking why I would even try something on > this order when the gcc which comes with Red Hat Linux 6.1 (my freshly > installed system) will produce executable code for this target without > requiring a cross compiler to be built at all. As I responded to one > questioner: Why am I trying to build a cross development environment from > ia32-elf to itself? I have a purely commercial goal: We manufacture > humidity test chambers here and I want to run an PC/104 i486DX board with a > FLASH rom image of compiled "C" code as a slave controller for one. We do > not want to distribute our proprietary source code along with each packaged > environmental chamber we sell, which the GNU general license would seem to > require. Thus I need to sidestep GNU libc and substitute a library > appropriate for our needs. > > So do I misunderstand something here? If I'm doing something stupid in > either project definition or implementation I would DEFINITELY want to know! > I started out following virtually exactly the four-tree example from the > CrossGCC FAQ. (All right, so I used "prefix = /cross" instead of "prefix = > /bar". Maybe that's my problem. :-) The make for gcc failed on libgcc2.c, > bombing out with file not found errors on "#include <stdlib.h>" and > "#include <unistd.h>". It seems the source tree didn't include those files > in the directory specified in the -I option. So I got around this with > specifying "--with-headers=/(path to newlib-1.8.2)/newlib/libc/include", > which subdirectory did include the needed headers. > > But this was only the start of my build troubles. I don't want to go on > with exhaustive details about all I tried. But everything failed, and > always with some form of file not found error. Inescapably, the conclusion > dawned that existing build scripts were flawed and didn't provide for the > needed files. Altogether, I eventually sent in four separate bug reports to > bug-gcc@gnu.org. > > Many people offered suggestions, usually of the form "if only you had done > so and so . . ." But "so and so . . ." never worked. I've been > systematically trying everything suggested, and my last hope seems to be > RTEMS. I'm working on that, but I've had problems getting all the source > code. I think I've found a source for egcs-1.1b on a mirror site, so I may > get to try it after all. > > But whether I ever get RTEMS to work or never do, I'm pretty sure that the > build scripts for CrossGCC are badly broken for an i486 target. Has anyone > here ever built a cross compiler for an i[3456]86? Or am I the only one > crazy enough to even try this? > > Your thoughts, comments, or brickbats would be most welcome. Thanks again, > everyone. > > Richard Bowser > Engineer > Thunder Scientific Corporation > > email: richardb@thunderscientific.com > > > > > ------ > Want more information? See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/ > Want to unsubscribe? Send a note to crossgcc-unsubscribe@sourceware.cygnus.com > ------ Want more information? See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/ Want to unsubscribe? Send a note to crossgcc-unsubscribe@sourceware.cygnus.com
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