arm-none-eabi-g++: error: nano.specs: No such file or directory

最近想使用eclipse+Sourcery对STM32的工程进行编译，使用GNU的新建STM32模板工程，bulid是出现如下错误：

17:00:48 **** Incremental Build of configuration Release for project STM32 ****cs-make all 'Building target: STM32.elf''Invoking: Cross ARM C++ Linker'arm-none-eabi-g++ -mcpu=cortex-m3 -mthumb -Os -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -Wall -Wextra  -g -T mem.ld -T libs.ld -T sections.ld -nostartfiles -Xlinker --gc-sections -L"../ldscripts" -Wl,-Map,"STM32.map" --specs=nano.specs -o "STM32.elf"  ./system/src/stm32f1-stdperiph/misc.o ./system/src/stm32f1-stdperiph/stm32f10x_gpio.o ./system/src/stm32f1-stdperiph/stm32f10x_rcc.o  ./system/src/newlib/_cxx.o ./system/src/newlib/_exit.o ./system/src/newlib/_sbrk.o ./system/src/newlib/_startup.o ./system/src/newlib/_syscalls.o ./system/src/newlib/assert.o  ./system/src/diag/Trace.o ./system/src/diag/trace_impl.o  ./system/src/cortexm/_initialize_hardware.o ./system/src/cortexm/_reset_hardware.o ./system/src/cortexm/exception_handlers.o  ./system/src/cmsis/system_stm32f10x.o ./system/src/cmsis/vectors_stm32f10x.o  ./src/BlinkLed.o ./src/Timer.o ./src/_write.o ./src/main.o   arm-none-eabi-g++: error: nano.specs: No such file or directorycs-make: *** [STM32.elf] Error 117:00:54 Build Finished (took 5s.875ms)

搜索这一问题的原因，结果如下：

**** C Libraries usage+ This toolchain is released with two prebuilt C libraries based on newlib: one is the standard newlib and the other is newlib-nano for code size.+ To distinguish them, we rename the size optimized libraries as:  #+BEGIN_EXAMPLE  libc.a --> libc_s.a  libg.a --> libg_s.a  #+END_EXAMPLE  + To use newlib-nano, users should provide additional gcc link time option:  #+BEGIN_EXAMPLE  --specs=nano.specs  #+END_EXAMPLE  + Nano.specs also handles two additional gcc libraries: libstdc++_s.a and libsupc++_s.a, which are optimized for code size.  + For example:    #+BEGIN_SRC sh      arm-none-eabi-gcc src.c --specs=nano.specs $(OTHER_OPTIONS)    #+END_SRC  + This option can also work together with other specs options like    #+BEGIN_EXAMPLE    --specs=rdimon.specs    #+END_EXAMPLE+ Please be noticed that --specs=nano.specs is a linker option. Be sure to include in linker option if compiling and linking are separated.***** additional newlib-nano libraries usageNewlib-nano is different from newlib in addition to the libraries' name.Formatted input/output of floating-point number are implemented as weak symbol.If you want to use %f, you have to pull in the symbol by explicitly specifying"-u" command option.     -u _scanf_float  -u _printf_floate.g. to output a float, the command line is like: $ arm-none-eabi-gcc --specs=nano.specs -u _printf_float $(OTHER_OPTIONS)For more about the difference and usage, please refer the README.nano in thesource package.

还是没有给出解决的方法，后来发现可在工程设置里面把nano禁止，禁止以后，编译正常。