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Re: m68k: conflicting types for 'read'

On Aug 3, 2014, at 17:08, Joel Sherrill wrote:
> On August 3, 2014 5:48:24 AM CDT, Anders Montonen <> wrote:
>> Hi,
>> When trying to compile newlib 2.1.0 for a m68k-unknown-elf target using
>> GCC 4.9.1 (same behaviour with GCC 4.8.3), the build fails with an
>> error about conflicting types for the read function. Newlib 2.0.0
>> compiles without errors.
>> /Users/anders/work/toolchain/gcc/4.9.1/m68k-elf/./gcc/xgcc
>> -B/Users/anders/work/toolchain/gcc/4.9.1/m68k-elf/./gcc/ -nostdinc
>> -B/Users/anders/work/toolchain/gcc/4.9.1/m68k-elf/m68k-elf/newlib/
>> -isystem
>> /Users/anders/work/toolchain/gcc/4.9.1/m68k-elf/m68k-elf/newlib/targ-include
>> -isystem
>> /Users/anders/work/toolchain/gcc/4.9.1/gcc-4.9.1/newlib/libc/include
>> -B/Users/anders/work/toolchain/gcc/4.9.1/m68k-elf/m68k-elf/libgloss/m68k
>> -L/Users/anders/work/toolchain/gcc/4.9.1/m68k-elf/m68k-elf/libgloss/libnosys
>> -L/Users/anders/work/toolchain/gcc/4.9.1/gcc-4.9.1/libgloss/m68k
>> -B/Users/anders/local/m68k-elf/bin/ -B/Users/anders/local/m68k-elf/lib/
>> -isystem /Users/anders/local/m68k-elf/include -isystem
>> /Users/anders/local/m68k-elf/sys-include    -g -O2 -g -O2  -mcpu=51qe
>> -DHOSTED=1 -I. -I../../../../../gcc-4.9.1/libgloss/m68k/.. -c
>> ../../../../../gcc-4.9.1/libgloss/m68k/io-read.c -o hosted-read.o
>> ../../../../../gcc-4.9.1/libgloss/m68k/io-read.c:33:9: error:
>> conflicting types for 'read'
>> ssize_t read (int fd, void *buf, size_t count)
>>        ^
>> In file included from
>> /Users/anders/work/toolchain/gcc/4.9.1/gcc-4.9.1/newlib/libc/include/sys/unistd.h:8:0,
>> from
>> /Users/anders/work/toolchain/gcc/4.9.1/gcc-4.9.1/newlib/libc/include/unistd.h:4,
>>             from ../../../../../gcc-4.9.1/libgloss/m68k/io-read.c:17:
>> /Users/anders/work/toolchain/gcc/4.9.1/gcc-4.9.1/newlib/libc/include/sys/unistd.h:144:25:
>> note: previous declaration of 'read' was here
>> _READ_WRITE_RETURN_TYPE _EXFUN(read, (int __fd, void *__buf, size_t
>> __nbyte ));
> What is _READ_WRITE_RETURN_TYPE defined to for this target? I recall that ssize_t is correct because -1 can be returned.

If I'm reading the sources right, it falls under the default 'int' case in sys/config.h. This has not changed between 2.0.0 and 2.1.0. However, I suspect that in sys/_types.h, _ssize_t is now typedef'd from GCC's __SIZE_TYPE__ instead of int as before.

Anders Montonen

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