如何在不指定RPATH的情况下直接在自定义路径中链接共享库? [英] How to link shared libraries in custom path directly without specifying RPATH?

问题描述

我在Ubuntu 16.04上，并且我需要使用外部库( MCR ).它将所有共享库放在MATLAB/bin/glnxa64/文件夹中.我只需要libmx.so，但那里的库名称与/usr/lib中的库名称完全相同，但实际上它们是不同的(因为文件大小不同)，例如libtiff.so.5.

I am on Ubuntu 16.04, and I am required to use an external library (MCR). It puts all of it's shared libraries inside the MATLAB/bin/glnxa64/ folder. I only need the libmx.so in there but there are libraries in there that has the exact same name as the ones in /usr/lib but they are actually different (because the file size is different), for example libtiff.so.5.

这成为一个问题，因为当我在CMake中使用find_library函数将MATLAB/bin/glnxa64/添加到RPATH中以链接到我的应用程序的libmx.so时，因为我的应用程序还依赖于另一个外部库(OpenCV)，在构建时已链接到/usr/lib中的libtiff.so.5，当我编译我的应用程序时，它显示出编译错误

This becomes a problem because when I use the find_library function in CMake to add MATLAB/bin/glnxa64/ into RPATH in order to link to libmx.so for my application, since my application also depends on another external library (OpenCV) that was linked to the libtiff.so.5 in /usr/lib when it was built, when I compile my application it shows an compilation error of

/usr/lib/libopencv_imgcodecs.so.3.3.0:未定义的引用 `TIFFReadDirectory@LIBTIFF_4.0'

/usr/lib/libopencv_imgcodecs.so.3.3.0: undefined reference to `TIFFReadDirectory@LIBTIFF_4.0'

这是因为我的应用程序试图链接到MATLAB/bin/glnxa64/中的libtiff.so.5而不是/usr/lib，因为RPATH的优先级高于默认目录.解决此问题的最佳方法是什么?

It is because my application is trying to link to the libtiff.so.5 in MATLAB/bin/glnxa64/ instead of /usr/lib because RPATH has a higher priority than the default directories. What is the best way to solve this?

我尝试将MATLAB/bin/glnxa64/中的libtiff.so.5重命名为类似libtiff_old.so.5的名称.这可以解决，但是非常难看.

I tried renaming the libtiff.so.5 in MATLAB/bin/glnxa64/ to something like libtiff_old.so.5. This solves it but is very ugly.

无论如何，我是否可以更改搜索优先级，以使RPATH遵循默认目录?还是我可以在CMake中做些什么，以便我的应用程序可以直接链接到libmx.so，而不必在RPATH中添加MATLAB/bin/glnxa64/来弄乱事情?

Is there anyway I can alternate the search priority so RPATH goes after the default directories? Or is there something I can do in CMake so my application can directly link to libmx.so without having to add MATLAB/bin/glnxa64/ into RPATH to mess things up?

推荐答案

嗯，首先很高兴看到您的cmake文件，但是but.

Well, first it would be good to see your cmake file, but alas..

您可以尝试使用它，< ...>是MATLAB安装的基本目录，它可能是/usr/local/或/opt.

You can try using this, the <...> is your base directory for the MATLAB install, which might be /usr/local/ or /opt.

find_library (MATLAB_RUNTIME libmx 
    PATHS <...>/MATLAB/bin/glnxa64/
    NO_DEFAULT_PATH )

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