在連接錯誤「的插件符號」

Question

所以，我做了一件愚蠢的，並給自己買了一個鏈接錯誤：

CMakeFiles/pipeline.dir/src/pipeline/pipelineElements/tracker/ObjectTracker.cpp.o (symbol from plugin): In function `ObjectTracker::process(long)': 
(.text+0x0): multiple definition of `BackgroundSubtract::OptionTypes<(BackgroundSubtractOptionID)0>::type PipelineConfiguration::getOption<BackgroundSubtract, (BackgroundSubtractOptionID)0>(BackgroundSubtract const&) const' 
CMakeFiles/pipeline.dir/src/pipeline/pipelineElements/RegionFinder.cpp.o (symbol from plugin):(.text+0x0): first defined here 
CMakeFiles/pipeline.dir/src/pipeline/pipelineElements/tracker/ObjectTracker.cpp.o (symbol from plugin): In function `ObjectTracker::process(long)': 

我很好奇「從插件符號」的部分是什麼意思？我從來沒有見過，在我的各種冒險鏈接器錯誤之前。在這種情況下什麼是「插件」？

Answer 1

這是指提高優化質量的鏈接器插件;大概這個版本是使用國旗-fuse-linker-plugin。

When supported by the linker, the linker plugin (see -fuse-linker-plugin) passes information to the compiler about used and externally visible symbols.

[...]

This information specifies what symbols can be accessed externally (by non-LTO object or during dynamic linking).

http://gcc.gnu.org/onlinedocs/gcc-4.6.4/gcc/Optimize-Options.html