Xcode环境变量

约定1：

~=当前账户的HOME目录，例如“/Users/crazy”

约定2：

build构建基础路径：

BUILD_PATH = ~/Library/Developer/Xcode/DerivedData/Build。

可通过“File->Project Settings”查看Derived Data Location。

或者

Xcode ->Preferences->Locations->Derived Data  来设置

以下背景结构：

XCSDKDemoWorkspace目录：此目录下面有.xcworkspace文件，

同时还有XCSDKDemo目录：此目录下面有.xcodeproj文件

和XCSDK目录

现在以XCSDKDemo目录下面的XCSDKDemo.xcodeproj来讨论

build构建基础路径：
/Users/crazy/Desktop/XCSDKDemoWorkspace/XCSDKDemo/DerivedData/Build/

SYMROOT = /Users/crazy/Desktop/XCSDKDemoWorkspace/XCSDKDemo/DerivedData/Build/Products

#####XCSDKDemo.xcodeproj所在的目录
SRCROOT = /Users/crazy/Desktop/XCSDKDemoWorkspace/XCSDKDemo

CONFIGURATION_BUILD_DIR = /Users/crazy/Desktop/XCSDKDemoWorkspace/XCSDKDemo/DerivedData/Build/Products/Debug-iphoneos

BUILD_DIR = /Users/crazy/Desktop/XCSDKDemoWorkspace/XCSDKDemo/DerivedData/Build/Products

 BUILD_ROOT = /Users/crazy/Desktop/XCSDKDemoWorkspace/XCSDKDemo/DerivedData/Build/Products

约定3：环境变量宏（Build Setting Macros）引用格式：${MACRO}，同Build Phases Run Script中的语法。

(b) PROJECT & SOURCE

PROJECT = XMPayAndRedeemSDKDemo

PROJECT_DIR = /Users/crazy/Desktop/XCSDKDemoWorkspace/XCSDKDemo

PROJECT_FILE_PATH =${PROJECT_DIR}/XCSDKDemo.xcodeproj

PROJECT_NAME = XCSDKDemo

SOURCE_ROOT =${PROJECT_DIR}

SRCROOT =${PROJECT_DIR}

(c) BUILD & CONFIGURATION

BUILD_PATH = /Users/crazy/Desktop/XCSDKDemoWorkspace/XCSDKDemo/DerivedData/Build/

BUILD_DIR = BUILD_PATH/Products

BUILD_ROOT = BUILD_PATH/Products

BUILT_PRODUCTS_DIR = BUILD_PATH/Products/Debug-iphoneos

CONFIGURATION = Debug

CONFIGURATION_BUILD_DIR =BUILD_PATH/Products/Debug

(d) PRODUCT & TARGET

PRODUCT_NAME = XCSDKDemo

PRODUCT_TYPE = com.apple.product-type.tool// Project Template: Command Line Tool

TARGET_BUILD_DIR =BUILD_PATH/Products/Debug

TARGET_NAME = XCSDKDemo

5）构建输出目录（Preferences->Locations->Locations）
当选择为Default时，Derived Data的目录为~/Library/Developer/Xcode/DerivedData。

当选择为Relative时，Derived Data的目录为当前.xcodeproj所在的目录。

当选择为Custom时，Derived Data的目录需自定义。

不建议使用绝对路径，因为写死之后，换环境或换平台，又要重新修改路径，建议使用相对路径（Relative）。

1）查看环境变量宏

命令行进入HelloWorld工程目录，执行xcodebuild命令并带上“-showBuildSettings”参数：
$ xcodebuild -project HelloWorld.xcodeproj -target HelloWorld -configuration Debug -showBuildSettings > xcodebuild_showBuildSettings.txt

则xcodebuild_showBuildSettings.txt中保存了Build settings for action build and target "HelloWorld”，其中dump了所有的环境变量。

参考：

http://www.cocoachina.com/ios/20141225/10761.html