Cmake链接到共享库无法找到库 [英] Cmake linking to shared library cannot find library

问题描述

在Ubuntu上，我有两个目录： build 和 src 。在 src 中，我的 CMakeLists.txt 文件具有以下行：

On Ubuntu, I have two directories: build and src. In src, my CMakeLists.txt file has the lines:

add_executable(Test main.cpp)

target_link_libraries(Test libCamera.so)

在构建目录（ cmake ../ src ）中运行cmake后，然后复制我的库文件 libCamera.so 导入构建目录。运行make后， main.cpp.o 文件成功编译，但在连接期间收到以下错误：

After running cmake in the build directory (cmake ../src), I then copy my library file libCamera.so into the build directory. After running make, the main.cpp.o file compiles successfully, but I receive the following error during linking:

/usr/bin/ld: cannot find -lCamera

为什么是这样？共享库在我正在建立的同一个目录...和同样的事情发生，如果我将该库复制到 / usr / bin ...

Why is this? The shared library is in the same directory that I am building in... and the same thing happens if I copy the library to /usr/bin...

推荐答案

您不应该将前缀 lib 和后缀。所以的库，所以只需使用：

You should not put prefix lib and suffix .so of the library, so just use:

target_link_libraries(Test Camera)

如果您的库找不到，您可能需要添加目录，其中库位于：

if your library not found you may need to add directory, where library is located:

link_directories( /home/user/blah ) # for specific path
link_directories( ${CMAKE_CURRENT_BINARY_DIR} ) # if you put library where binary is generated

注意：您将lib复制到 / usr / bin 但不像Windows中的dll文件与可执行文件存储，在Linux中不是这样，所以它会是 / usr / lib ，而不是 / usr / bin 。此外，您可以更改 LD_LIBRARY_PATH 变量，使您的程序在自定义位置中查找库。

Note: you copied lib to /usr/bin but unlike Windows where dll files stored with executables, in Linux that is not the case, so it would be /usr/lib, not /usr/bin. Also you may change LD_LIBRARY_PATH variable to make your program to find a library in a custom location.

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