关于pkg-config和LD_LIBRARY_PATH的区别
[英]Difference about pkg-config and LD_LIBRARY_PATH
问题描述
I am trying to understand the compile and link process in C++ on Ubuntu. 
我试图了解Ubuntu上C ++中的编译和链接过程。
From what I've learned, pkg-config is usually used to extract metadata defined in .pc file through PKG_CONFIG_PATH , then to locate the include and library file needed when compiling and linking. 据我了解， pkg-config通常用于通过PKG_CONFIG_PATH提取.pc文件中定义的元数据，然后找到编译和链接时所需的包含和库文件。
My question is since we already have pkg-config , why do we bother using LD_LIBRARY_PATH and ld.so.conf ? 我的问题是，因为我们已经有了pkg-config ，为什么还要麻烦使用LD_LIBRARY_PATH和ld.so.conf ？ Does pkg-config and LD_LIBRARY_PATH have different use (I know LD_LIBRARY_PATH has a higher priority than ld.so.conf ), or is LD_LIBRARY_PATH used for the situation when there is no .pc file, or is it just this priority thing? pkg-config和LD_LIBRARY_PATH用法是否有所不同（我知道LD_LIBRARY_PATH的优先级高于ld.so.conf ），或者在没有.pc文件的情况下使用LD_LIBRARY_PATH还是仅仅是此优先级？
1 个解决方案
解决方案1
0 已采纳 2019-07-15 07:30:56
LD_LIBRARY_PATH and ld.so.conf are used to locate shared libraries at run time, when program is started by the loader ( ld.so ). 当加载程序（ ld.so ）启动程序时，使用LD_LIBRARY_PATH和ld.so.conf在运行时定位共享库。 pkg-config files instead contain compiler/linker flags ( -I , -L , -l , etc.) needed to build program that uses particular library (eg locate linked shlibs via -Lpath ). pkg-config文件而是包含编译器/链接器标志（ -I ， -L ， -l等），用于构建使用特定库的程序（例如，通过-Lpath找到链接的-Lpath ）。
Also note that many libraries lack .pc configs. 另请注意，许多库缺少.pc配置。
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