addr2line - convert addresses into file names and line numbers.
       ar - create, modify, and extract from archives
       as - the portable GNU assembler.
       gcc - GNU project C and C++ compiler
       cpp - The C Preprocessor
       gcov - coverage testing tool
       gdb - The GNU Debugger
       gprof -- display call graph profile data
       ld - Using LD, the GNU linker
       nm - list symbols from object files
       objdump - display information from object files.
       objcopy - copy and translate object files
       ranlib - generate index to archive.
       readelf - Displays information about ELF files.
       size - list section sizes and total size.
       strings - print the strings of printable characters in files.
       strip - Discard symbols from object files.

------解决方案--------------------
加入你用arm-linux-gcc创建了.o文件,难道准备用ar来建.a文件?

其余用法相同道理

------解决方案--------------------
想知道命令的含义？

举个例子，其余类推，呵呵

在Bash下键入命令：man gcc 【回车】

就可以看到详细解释。

接分哟！~~

------解决方案--------------------
google或者man一下就知道了

2楼的英文解释翻译一下也能了解大概