Xcode 4：项目不支持工作区中的 $(inherited) 构建设置？
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Xcode 4: Project does not honor $(inherited) Build Setting in Workspace?
提问by jww
Today is my day to suffer through Xcode 4, Workspaces, and Projects.
今天是我饱受 Xcode 4、工作区和项目困扰的一天。
I have a workspacewith a few open source libraries (openssl, sqlcipher, and a couple of others). Within the workspace there is one "Main" projectwhich produces an EXE as a target. The open source projects are "subprojects" or "child projects" to the "Main" project. It looks similar to below:
我有一个工作区的几个开源库（OpenSSL的，sqlcipher，和其他几个）。在工作区中有一个“主”项目，它生成一个 EXE 作为目标。开源项目是“主”项目的“子项目”或“子项目”。它看起来类似于下图：
Main Project
+- OpenSSL Project
+- SqlCipher Project
...
In the "Main" project, under "Project" (rather than "Target"), I set preprocessor and warning flags build settings. For example, the debug preprocessor macros are "DEBUG=1 SQLITE_DEBUG=1 SQLITE_HAS_CODEC=1" (without the quotes). Conversely, release preprocessor macros is set to "NDEBUG=1 NS_BLOCK_ASSERTIONS=1 SQLITE_HAS_CODEC=1".
在“主”项目中，在“项目”（而不是“目标”）下，我设置了预处理器和警告标志构建设置。例如，调试预处理器宏是“DEBUG=1 SQLITE_DEBUG=1 SQLITE_HAS_CODEC=1”（不带引号）。相反，发布预处理器宏设置为“NDEBUG=1 NS_BLOCK_ASSERTIONS=1 SQLITE_HAS_CODEC=1”。
In the Main "Target" (not "Project") and all subprojects (both "Project" and "Targets"), I ensure there are no project-specific build setting overrides (by highlighting "Preprocessor Macros" and pressing COMMAND+DELETE). I then ensure the field is set to "$(inherited)" (without the quotes).
在主“目标”（不是“项目”）和所有子项目（“项目”和“目标”）中，我确保没有特定于项目的构建设置覆盖（通过突出显示“预处理器宏”并按 COMMAND+DELETE） . 然后我确保该字段设置为“$(inherited)”（不带引号）。
Lo and behold, the child projects do not honor "$(inherited)". When I look at the command line issued by Xcode, nothing is present that should be present from GCC_PREPROCESSOR_DEFINITIONS. For example, the SqlCipher's project files are not compiled with the inherited build settings from Main.
瞧，子项目不尊重“$（继承）”。当我查看 Xcode 发出的命令行时，GCC_PREPROCESSOR_DEFINITIONS 中不存在任何应该存在的内容。例如，SqlCipher 的项目文件不是使用从 Main 继承的构建设置编译的。
I thought the problem might be similar to Preprocessor Macros ignored in XCode's project settings, but not target settings, but I can't seem to get the same [positive] results.
我认为问题可能类似于在 XCode 的项目设置中忽略的预处理器宏，但不是目标设置，但我似乎无法获得相同的 [positive] 结果。
Could anyone explain to me how to get child projects to honor "$(inherited)"? As I try to read through Apple's documentation, I only get more confused by what I read and the behavior I observe. Please explain it as if you were talking to a child.
谁能向我解释如何让子项目兑现“$（继承）”？当我尝试通读 Apple 的文档时，我只会对我阅读的内容和我观察到的行为感到更加困惑。请像在和孩子说话一样解释它。
回答by justin
These settings don't cross project boundaries. I recommend you configure your targets using .xcconfigfiles instead (these may be referenced by multiple projects).
这些设置不会跨越项目边界。我建议您使用.xcconfig文件来配置目标（这些文件可能会被多个项目引用）。
Update/Explanation:Using your example setup: The build settings for Main Project may affect any of Main Project's targets, but they won't cross over to OpenSSL Project's targets.
更新/说明：使用您的示例设置：主项目的构建设置可能会影响主项目的任何目标，但它们不会跨越 OpenSSL 项目的目标。
