This is the mail archive of the mailing list for the crossgcc project.

See the CrossGCC FAQ for lots more information.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

What functions to define for ARM newlib w/o "monitor" support?

I've built an arm-coff compiler where I've tried to disable newlib's lowlevel I/O routines, since these assume debug monitors my system doesn't have. Now, when I link my app with these, I get

/usr/src/redhat/BUILD/cross-gcc-arm-coff-2.95.3/build-newlib/arm-coff/be/newlib/libc/reent/../../../../../../newlib-1.11.0/newlib/libc/reent/sbrkr.c:60: undefined reference to `_sbrk'
/usr/src/redhat/BUILD/cross-gcc-arm-coff-2.95.3/build-newlib/arm-coff/be/newlib/libc/reent/../../../../../../newlib-1.11.0/newlib/libc/reent/readr.c:58: undefined reference to `_read'

etc. This is sort of what I expect since I obviously need to write my own sbrk, read, write etc. However, it seems like that in order to resolve the references, I have to define _sbrk(), _read(), _write() etc., while earlier when I did the same thing for m68k, those functions were called sbrk(), read(), write() and so on, i.e. the function names had no initial '_'.

Why this difference? Is this something I should expect, or does it mean that I've disabled the wrong code section in newlib?

BTW, as I mentioned once several months ago: The arm build uses special defines/-D flags to control its debug monitor setup; two different monitors are supported, and the setup has an "enable" macro for each of these. However, some sections of the code will enable one of the monitors even if neither is defined. Isn't that somewhat inconsistent? I'd say that as long as there are separate flags for the monitors, the code should be built with support for none of them if no flag is set. Alternatively, you could have just one flag and *always* assume the "other" monitors when it's not defined.

- Toralf

Want more information?  See the CrossGCC FAQ,
Want to unsubscribe? Send a note to

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]