想目中不免会引入一些静态库，可是有时加入'.a'文件后编译便会报以下错误
ld: warning: ignoring file ”…/XXX.a”, file was built ld:
阅读背景：
静态库引入引起的错误解决方案，ld: warning: ignoring file ”…/XXX.a”, file was built for archive which is not the architecture being linked (armv7): “…/XXX.a” Undefined symbols for architecture armv7: "_OBJC_CLASS_$
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