问题：
- /opt/gcc-arm-none-eabi/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/lib/armv7e-m/fpu/libc.a(lib_a-writer.o): In function `_write_r':
- writer.c:(.text._write_r+0x12): undefined reference to `_write'
- /opt/gcc-arm-none-eabi/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/lib/armv7e-m/fpu/libc.a(lib_a-closer.o): In function `_close_r':
- closer.c:(.text._close_r+0xc): undefined reference to `_close'
- /opt/gcc-arm-none-eabi/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/lib/armv7e-m/fpu/libc.a(lib_a-lseekr.o): In function `_lseek_r':
- lseekr.c:(.text._lseek_r+0x12): undefined reference to `_lseek'
- /opt/gcc-arm-none-eabi/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/lib/armv7e-m/fpu/libc.a(lib_a-readr.o): In function `_read_r':
- readr.c:(.text._read_r+0x12): undefined reference to `_read'
- /opt/gcc-arm-none-eabi/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/lib/armv7e-m/fpu/libc.a(lib_a-sbrkr.o): In function `_sbrk_r':
- sbrkr.c:(.text._sbrk_r+0xc): undefined reference to `_sbrk'
- /opt/gcc-arm-none-eabi/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/lib/armv7e-m/fpu/libc.a(lib_a-fstatr.o): In function `_fstat_r':
- fstatr.c:(.text._fstat_r+0x10): undefined reference to `_fstat'
- /opt/gcc-arm-none-eabi/bin/../lib/gcc/arm-none-eabi/5.4.1/../../../../arm-none-eabi/lib/armv7e-m/fpu/libc.a(lib_a-isattyr.o): In function `_isatty_r':
- isattyr.c:(.text._isatty_r+0xc): undefined reference to `_isatty'
- collect2: error: ld returned 1 exit status
- Makefile:219: recipe for target 'all' failed
- make: *** [all] Error 1
| 
楼主
