iPhone-设备-链接器错误 [英] Iphone - device - linker error

问题描述

我已将libpng添加到我的应用程序中.如果我为模拟器构建，一切正常.当我为设备构建应用程序时，出现链接器错误:

I have added libpng to my application. If I build for simulator, everything is OK. When I build application for device, I got linker error:

    Undefined symbols for architecture armv7: "_png_init_filter_functions_neon", referenced from: _png_read_filter_row in libpng-arm7-release.a(pngrutil.o)

我已经从源代码手动构建了libpng，对于模拟器和设备也是如此(仅在更改了编译目标的情况下).我试图找到此问题，但似乎没有人发布有关此问题的任何信息.

I have build libpng manually from source, same way for simulator and device (only with changed target of compilation). I have tried to find this problem, but noone seems to post anything about this problem.

推荐答案

我通过替换libpng的pngpriv.h中的第117-121行来解决"此问题:

I "solved" this by replacing lines 117-121 in libpng's pngpriv.h:

#  ifdef __ARM_NEON__
#     define PNG_ARM_NEON_OPT 2
#  else
#     define PNG_ARM_NEON_OPT 0
#  endif

作者

#define PNG_ARM_NEON_OPT 0

这将禁用ARM的NEON优化，这似乎是问题的原因.

This disables ARM's NEON optimizations, which seems to be the cause of the problem.

这只是一种解决方法，我没有时间进一步研究问题的真正原因.

This is merely a workaround though, I didn't have time to investigate the real cause of the problem further.

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