Disabling reent support for a new target

[Jeff Johnston]

Nikolaos,

   Please read the header of /libc/include/reent.h  There is information 
about various ways to set up your syscalls.  The code in libc/reent are 
stubs that map the _r function calls internal to newlib to the syscalls 
you ultimately provide in your libgloss library.  If you want, you can 
start by using the libnosys library (-lnosys) which is a set of syscall 
stubs.  You will need to create a crt0 startup file if you haven't done 
so already.

-- Jeff J.

Nikolaos Kavvadias wrote:
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> Hello newlib'ers
> 
> i'm currently in the process of adding support for a small RISC
> (s'thing like DLX) processor in the newlib-1.14.0 source tree. I
> believe i'm mostly done. One of the last problems regards support for
> reentering functions (stuff that goes under /libc/reent/ i suppose).
> What i would like to do (as a first hack) is to disable the support
> for reents.
> 
> Is this possible (e.g. by setting an appropriate configuration)?
> Anyway, this is how a typical make behaves for the targeted
> processor/system (it will run on a simulator were most OS calls are
> supported by being intercepted and serviced by the host system).
> Please have a look below for the error messages produced by "make"
> when run on a single-file MiBench application (a routing algorithm,
> subbed "dijkstra").
> 
> risc-elf-gcc -specs=archc -O3 -fno-optimize-sibling-calls
> - -fomit-frame-pointer dijkstra_small.c -o dijkstra_small.risc
> /l/archc/compilers/risc/lib/gcc/risc-elf/3.4.1/../../../../risc-elf/lib/libc.a(openr.o):
> In function `_open_r':
> ../../../../../newlib-1.14.0/newlib/libc/reent/openr.c:59: undefined
> reference to `_open'
> /l/archc/compilers/risc/lib/gcc/risc-elf/3.4.1/../../../../risc-elf/lib/libc.a(sbrkr.o):
> In function `_sbrk_r':
> ../../../../../newlib-1.14.0/newlib/libc/reent/sbrkr.c:60: undefined
> reference to `_sbrk'
> /l/archc/compilers/risc/lib/gcc/risc-elf/3.4.1/../../../../risc-elf/lib/libc.a(readr.o):
> In function `_read_r':
> ../../../../../newlib-1.14.0/newlib/libc/reent/readr.c:58: undefined
> reference to `_read'
> /l/archc/compilers/risc/lib/gcc/risc-elf/3.4.1/../../../../risc-elf/lib/libc.a(writer.o):
> In function `_write_r':
> ../../../../../newlib-1.14.0/newlib/libc/reent/writer.c:58: undefined
> reference to `_write'
> /l/archc/compilers/risc/lib/gcc/risc-elf/3.4.1/../../../../risc-elf/lib/libc.a(lseekr.o):
> In function `_lseek_r':
> ../../../../../newlib-1.14.0/newlib/libc/reent/lseekr.c:58: undefined
> reference to `_lseek'
> /l/archc/compilers/risc/lib/gcc/risc-elf/3.4.1/../../../../risc-elf/lib/libc.a(closer.o):
> In function `_close_r':
> ../../../../../newlib-1.14.0/newlib/libc/reent/closer.c:53: undefined
> reference to `_close'
> /l/archc/compilers/risc/lib/gcc/risc-elf/3.4.1/../../../../risc-elf/lib/libc.a(fstatr.o):
> In function `_fstat_r':
> ../../../../../newlib-1.14.0/newlib/libc/reent/fstatr.c:62: undefined
> reference to `_fstat'
> collect2: ld returned 1 exit status
> make: *** [dijkstra_small.risc] Error 1
> 
> Thank you in advance
> 
> Kind regards
> Nikolaos Kavvadias
> 
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