xcode 使/usr/local/lib 成为mac os x 上ld 的默认库搜索路径？
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Make /usr/local/lib a default library search path for ld on mac os x?
提问by armando.sano
I have XCode installed, but for some reason, /usr/local/lib is not amongst the default library search paths:
我安装了 XCode，但由于某种原因，/usr/local/lib 不在默认库搜索路径中：
gcc -Xlinker -v
gives me:
给我：
@(#)PROGRAM:ld PROJECT:ld64-224.1
configured to support archs: armv6 armv7 armv7s arm64 i386 x86_64 armv6m armv7m armv7em
Library search paths:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib
Framework search paths:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/
This is unfortunate since /usr/local/libis a fairly canonical location for installed libraries and and there is no /etc/ld.so.conf+ldconfigon mac os xto modify the default library search paths. So without using -L/usr/local/libthis results in a linker error. Is there any other, non-runtime option than setting the environment variable DYLD_LIBRARY_PATH?
这是不幸的，因为它/usr/local/lib是已安装库的相当规范的位置，并且没有/etc/ld.so.conf+ ldconfigonmac os x来修改默认库搜索路径。所以不使用-L/usr/local/lib它会导致链接器错误。除了设置环境变量之外，还有其他非运行时选项DYLD_LIBRARY_PATH吗？
EDIT: Setting the DYLD_LIBRARY_PATHenv variable did nothing for me. I had to set the LIBRARY_PATHenv variable instead to be able to link libraries installed under /usr/local/libwith gcc.
编辑：设置DYLD_LIBRARY_PATHenv 变量对我没有任何作用。我必须设置LIBRARY_PATH环境变量，而不是要能下安装链接库/usr/local/lib用gcc。
Was there an option about this when installing XCode? (it's a work computer, haven't installed it myself)
安装时有没有关于这个的选项XCode？（是工作电脑，自己没装过）
回答by Francisco Aguilera
To add a temporary library to my project using Xcode I did the following:
要使用 Xcode 向我的项目添加临时库，我执行了以下操作：
To add a temporary include path to my XCode library search paths I had to do the following:
要将临时包含路径添加到我的 XCode 库搜索路径，我必须执行以下操作：
If you want to add default include and search pathsyou need to use:
如果要添加默认包含和搜索路径，则需要使用：
For include paths:
对于包含路径：
CPATH
C_INCLUDE_PATH
CPLUS_INCLUDE_PATH
OBJC_INCLUDE_PATH
And for library paths:
对于库路径：
LIBRARY_PATH
In order for Xcode and other GUI applications in OS X (tested on 10.10) to be able to access these environment variables, you need to set variables using:
为了让 OS X 中的 Xcode 和其他 GUI 应用程序（在 10.10 上测试）能够访问这些环境变量，您需要使用以下方法设置变量：
/bin/launchctl setenv LIBRARY_PATH /usr/local/lib
/bin/launchctl setenv CPATH /usr/local/include
But these are not permanent. In order to have these variables across restarts, you need to create a startup script. See this page for an example.
但这些都不是永久性的。为了在重新启动时使用这些变量，您需要创建一个启动脚本。有关示例，请参阅此页面。
