Use the AR command to delete the. o file that was repeatedly compiled by the iOS static library

About Xcode introducing third-party static class libraries duplicate symbol _objc_xxx repeating compilation errors

Look at this http://www.cnblogs.com/cocoajin/p/3917709.html.

Two ways were mentioned before;

One is to modify the Xcode compilation option; one is to remove a party while packaging;

There is a third way today;

Remove the specified duplicate compiled. o file directly in one of the packages using the AR command;

The following scenario demonstrates

Static library libtaobao.a with CEO.M file and CEO method

Static library libbaidu.a compiled with CEO.M files and has CEO method

Then when the above two static libraries appear in the same project, and the other link flag is-all_load, there will be a duplicate compilation error!

From what we can see is ceo.o this file is compiled repeatedly, then from the above two libraries any one of them can be removed

This time to solve the idea:

1. Use Lipo to split. A separately

2. Use the AR command to delete one of the. a conflicts. O

3. Merging with Lipo

The following demo,

Cocoapro:lib-taobao cocoajin$lsLibTaobao.acocoaPro:lib-taobao cocoajin$ Lipo-InfoLIBTAOBAO.A ArchitecturesinchThe Fatfile: libtaobao.a are:armv7 arm64 cocoapro:lib-taobao cocoajin$ Lipo Libtaobao.a-thin ARMV7-Output Tbv7.acocoaPro:lib-taobao cocoajin$ Lipo Libtaobao.a-thin arm64-Output Tb64.acocoaPro:lib-taobao cocoajin$lslibtaobao.a tb64.a tbv7.acocoaPro:lib-taobao cocoajin$ Lipo-Infotb*inputfileTB64.A is not a fatfileinputfileTBV7.A is not a fatfileNon-fatfile: tb64.a is Architecture:arm64non-fatfile: tbv7.a is Architecture:armv7cocoaPro:lib-taobao cocoajin$ar-d tbv7.a CEO.ococoaPro:lib-taobao cocoajin$ar-d tb64.a CEO.ococoaPro:lib-taobao cocoajin$ lipo-create tbv7.a tb64.a-Output LibTaobao.acocoaPro:lib-taobao cocoajin$ Lipo-InfoLIBTAOBAO.A ArchitecturesinchThe Fatfile: libtaobao.a are:armv7 arm64 cocoapro:lib-taobao cocoajin$

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After finally replacing the library that removed CEO.O, the project compiles through and runs normally!

Use the AR command to delete the. o file that the iOS static library repeatedly compiles