duplicate symbols for architecture i386

在xcode上链接静态库出现的的问题：

duplicate symbol ___sputc in:
    /Users/****/main_trunk/lib/mac/x86/debug/xxxxx.1.a(graphics_controller.o)
    /Users/****/main_trunk/lib/mac/x86/debug/xxxxx.1.a(mpls_parse.o)
duplicate symbol ___sputc in:
    /Users/****/main_trunk/lib/mac/x86/debug/xxxxx.1.a(graphics_controller.o)
    /Users/****/main_trunk/lib/mac/x86/debug/xxxxx.1.a(graphics_processor.o)
duplicate symbol ___sputc in:
    /Users/****/main_trunk/lib/mac/x86/debug/xxxxx.1.a(graphics_controller.o)
    /Users/****/main_trunk/lib/mac/x86/debug/xxxxx.1.a(ig_decode.o)
ld: 3 duplicate symbols for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

网上有说的解决方法是库或者文件重复添加原因，但是我检查过没发现问题，最后找到的解决法：
在工程设置中收搜OTHER_CFLAGS，并设置置为 “-fgnu89-inline”，再编译工程就ok了

有大神做了详细介绍，感谢@功名半纸
http://blog.youkuaiyun.com/force_eagle/article/details/11106571