Hi, I am new to both gnuarm and newlib. I download the toolchain provided by Darrik Spaude from gnuarm.org, and I am trying to build my hello_world.c, but I got the following error: /usr/local/arm/bin/../lib/gcc/arm-elf/4.2.0/../../../../arm-elf/lib/libc .a(lib_a-freer.o): In function `_malloc_trim_r': ../../../.././newlib/libc/stdlib/mallocr.c:3326: undefined reference to `_sbrk_r' ../../../.././newlib/libc/stdlib/mallocr.c:3335: undefined reference to `_sbrk_r' ../../../.././newlib/libc/stdlib/mallocr.c:3340: undefined reference to `_sbrk_r' /usr/local/arm/bin/../lib/gcc/arm-elf/4.2.0/../../../../arm-elf/lib/libc .a(lib_a-makebuf.o): In function `__smakebuf': ../../../.././newlib/libc/stdio/makebuf.c:54: undefined reference to `_fstat_r' /usr/local/arm/bin/../lib/gcc/arm-elf/4.2.0/../../../../arm-elf/lib/libc .a(lib_a-mallocr.o): In function `malloc_extend_top': ../../../.././newlib/libc/stdlib/mallocr.c:2160: undefined reference to `_sbrk_r' ../../../.././newlib/libc/stdlib/mallocr.c:2197: undefined reference to `_sbrk_r' /usr/local/arm/bin/../lib/gcc/arm-elf/4.2.0/../../../../arm-elf/lib/libc .a(lib_a-stdio.o): In function `__sclose': ../../../.././newlib/libc/stdio/stdio.c:120: undefined reference to `_close_r' /usr/local/arm/bin/../lib/gcc/arm-elf/4.2.0/../../../../arm-elf/lib/libc .a(lib_a-stdio.o): In function `__sseek': ../../../.././newlib/libc/stdio/stdio.c:103: undefined reference to `_lseek_r' /usr/local/arm/bin/../lib/gcc/arm-elf/4.2.0/../../../../arm-elf/lib/libc .a(lib_a-stdio.o): In function `__swrite': ../../../.././newlib/libc/stdio/stdio.c:76: undefined reference to `_lseek_r' ../../../.././newlib/libc/stdio/stdio.c:84: undefined reference to `_write_r' /usr/local/arm/bin/../lib/gcc/arm-elf/4.2.0/../../../../arm-elf/lib/libc .a(lib_a-stdio.o): In function `__sread': ../../../.././newlib/libc/stdio/stdio.c:47: undefined reference to `_read_r' I searched the web, and I think this is caused by missing stub implementations. My host machine is Intel MAC and the target is At91sam9260 based board running linux 2.6.22.1. I found that in the toolchain it already contians a libgloss-linux.a, then I tried to compile with -lgloss-linux，but I got the same error. Is there an available newlib stub implementation for arm-linux? Or maybe I misused the libgloss-linux.a? I checked with: arm-elf-nm libgloss-linux.a|grep sbrk 000000ac T _sbrk 000000ac T sbrk it seems the _sbrk_r is missing.
Thanks for posting here, Fan. I was going to do the same. Any suggestions are greatly appreciated. I have a request to GNUARM about the same issue and will post back here if I find any solution. If I find a solution, then I will also generate a new toolchain. Darrik
Darrik Spaude wrote: > Thanks for posting here, Fan. I was going to do the same. > > Any suggestions are greatly appreciated. I have a request to GNUARM > about the same issue and will post back here if I find any solution. If > I find a solution, then I will also generate a new toolchain. > > Darrik Thanks for the quick reply. I really appreciate for your contribution about GNUARM. :)
Just to follow up, the Mac versions of the toolchain I built include reentrancy, so the undefined references in question need to be defined by the source being compiled and linked. For example, in an embedded system a printf() could mean output is sent to a UART or USB or some other device, so the implementation needs to define which device is the default target for a write. Thanks goes to Pablo at GNU ARM for his input.
Watch this topic
Disable multi-page viewPlease log in before posting. Registration is free and takes only a minute.
Existing account
Do you have a Google/GoogleMail account? No registration required!
Log in with Google account
Log in with Google account
No account? Register here.