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Dan Kegel <dank@kegel.com> wrote: > Aitor Garcia wrote: > > What's the difference between arm-linux and arm-elf > > targets ?. > > I think that arm-linux is to be used with glibc > > libraries and arm-elf is to be used with newlib. > > Is this correct ?. > > Yes. There is one basical difference which is that Linux/ARM is for only CPUs with a FPU (hard-float), the Linux kernel has always a FPU-emulator, so everything will be compiled as if there would be a FPU-unit. The situation is quite similar or worse with the 'i386' target: Even the embedded 'i386-elf' target expects a '387' being present, or being emulated, no support for '-msoft-float' as is the case with other CPUs, in the FSF sources. The '-msoft-float' (with triggering the '-mno-fp-ret-in-387') can be enabled though, but why every embedded i386EX, i486SX etc. based system is assumed to have a '387/487SX' is still odd... Another difference of course between the '*-linux' and '*-elf' targets is that Linux uses also shared libs when the embedded targets use only statically linked executables. A statically linked Linux executable (against glibc) would be 10 or so times bigger than an 'elf' executable (linked against newlib), all the 'i386-elf' and 'i386-linux' target toolchain owners are free to check this... I checked the situation with the ARM using gcc-3.2.3 etc. : /home1/kai/test/hello > arm-linux-gnu-size hi_arm-*.x text data bss dec hex filename 11156 2292 228 13676 356c hi_arm-elf.x 392448 3496 4340 400284 61b9c hi_arm-linux.x A statically linked executable with a code size of 392+ kbytes instead of 11+ kilobytes tells why glibc wouldn't very good in any embedded work... Cheers, Kai ------ Want more information? See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/ Want to unsubscribe? Send a note to crossgcc-unsubscribe@sources.redhat.com
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