有时我的 Pebble watchapp 拒绝构建，给出不友好的错误消息：
$ pebble build
[...]
[ 9/13] cprogram: build/src/project_lift.c.7.o build/appinfo.auto.c.7.o -> build/pebble-app.elf
/Users/Pavlo/pebble-dev/PebbleSDK-2.0.1/arm-cs-tools/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/lib/thumb2/libc.a(lib_a-sbrkr.o): In function `_sbrk_r':
/Users/thomas/work/arm-eabi-toolchain/build/newlib/arm-none-eabi/thumb2/newlib/libc/reent/../../../../../../../newlib-2012.09/newlib/libc/reent/sbrkr.c:60: undefined reference to `_sbrk'
collect2: error: ld returned 1 exit status
sbrkr.c我与直接无关。我发现这是由我的应用程序中的特定代码行引起的。我可以获得更简洁的错误消息（可能是调用堆栈）吗？