xcode -isysroot 或 SDKROOT 问题
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-isysroot or SDKROOT problem
提问by Raviprakash
I am a newbie to libhistory, so I was looking at the sample found with readline library. Compiled it on command prompt using:
我是 libhistory 的新手，所以我正在查看使用 readline 库找到的示例。使用以下命令在命令提示符下编译它：
gcc -o ./a.out /usr/local/share/readline/histexamp.c -lreadline -L/usr/local/lib/Then crated a xcode project with the same file and linked against readline library it compiles fine. But when I run , it won't maintain history and crashing while enumeration of history entries. After some trials i found that -isysroot argument is the cause for this problem:
然后用相同的文件创建一个 xcode 项目并链接到它编译良好的 readline 库。但是当我运行时，它不会在枚举历史条目时保持历史和崩溃。经过一些试验，我发现 -isysroot 参数是导致此问题的原因：
-isysroot /Developer/SDKs/MacOSX10.6.sdkWhy the same program behaves differently with this option?
为什么同一个程序使用这个选项会有不同的表现？
回答by Paul R
-isysroot is used to define the SDK that you build with. If you build with the 10.6 SDK and then try and run on OS X 10.5 then you will probably fail. You should build with whichever SDK corresponds to the minimum required OS for your program (for maximum backward-compatibility).
-isysroot 用于定义您构建时使用的 SDK。如果您使用 10.6 SDK 构建，然后尝试在 OS X 10.5 上运行，那么您可能会失败。您应该使用与您的程序所需的最低操作系统相对应的任何 SDK 进行构建（以获得最大的向后兼容性）。
回答by yushen
-isysroot /Developer/SDKs/MacOSX10.6.sdk
the sysroot will overwrite the system path /usr/local etc.
sysroot 将覆盖系统路径 /usr/local 等。
In my opinion, it is a problematic way to use the SDK path by XCode. It will result in a non-existent path like /Developer/SDKs/MacOSX10.6.sdk/usr/local/lib/ if you want to search in the user link -L/usr/local/lib/
在我看来，通过 XCode 使用 SDK 路径是一种有问题的方式。如果你想在用户链接 -L/usr/local/lib/ 中搜索，它会导致一个不存在的路径，比如 /Developer/SDKs/MacOSX10.6.sdk/usr/local/lib/
I don't think it is a good idea at all to change sysroot just in order to use SDK
我认为仅仅为了使用 SDK 而改变 sysroot 根本不是一个好主意
