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我正在尝试构建一个依赖于 GraphicsMagick C++ 库的小实用程序，但在链接到该库时出现以下错误：

make  all-recursive
make[1]: Entering directory `/home/ale/sample'
Making all in src
make[2]: Entering directory `/home/ale/sample/src'
g++  -g -O2   -o mysample mysample-a.o -L/usr/local/lib -lexiv2   -L/usr/local/lib -lGraphicsMagick++ -lGraphicsMagick    
/usr/local/lib/libGraphicsMagick.a(magick_libGraphicsMagick_la-png.o): In function `png_put_data':
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:1171: undefined reference to `png_get_io_ptr'
/usr/local/lib/libGraphicsMagick.a(magick_libGraphicsMagick_la-png.o): In function `PNGWarningHandler':
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:1357: undefined reference to `png_error'
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:1361: undefined reference to `png_get_error_ptr'
/usr/local/lib/libGraphicsMagick.a(magick_libGraphicsMagick_la-png.o): In function `PNGErrorHandler':
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:1338: undefined reference to `png_get_error_ptr'
/usr/local/lib/libGraphicsMagick.a(magick_libGraphicsMagick_la-png.o): In function `png_get_data':
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:1060: undefined reference to `png_get_io_ptr'
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:1076: undefined reference to `png_warning'
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:1077: undefined reference to `png_error'
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:1067: undefined reference to `png_warning'
/usr/local/lib/libGraphicsMagick.a(magick_libGraphicsMagick_la-png.o): In function `png_write_raw_profile':
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:6243: undefined reference to `png_malloc'
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:6253: undefined reference to `png_malloc'
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:6254: undefined reference to `png_malloc'
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:6281: undefined reference to `png_set_text'
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:6282: undefined reference to `png_free'
/home/ale/Downloads/GraphicsMagick-1.3.18/coders/png.c:6283: undefined reference to `png_free'

为什么 /usr/local/lib 中的库引用 GraphicsMagick 源代码（我已经构建和安装）？

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1 回答 1

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错误说您也需要与 libpng 链接。

您有非常描述性的源代码相关错误，因为您已经使用调试符号构建了 graphicsmagick。在发布版本中（或者如果您将调试符号从调试版本中删除），您将只看到未定义的函数名称，而没有使用它们的源代码引用。

于 2013-10-10T05:05:59.993 回答