I just spent sometime with Xcode 5 Developer Preview, and looks like Apple has changes this extension to '.pch' instead.

Is there a way to support both .pch and .pth in order to support the latest version and be back-compatible at the same time?

FYI, I copied this section from the xcodebuild.log of a client project. 

```
ProcessPCH /Users/lqi/Library/Developer/Xcode/DerivedData/ProjectName-cvncefyloqlfqlamzkxkzajraozj/Build/Intermediates/PrecompiledHeaders/ProjectName-Prefix-girwpdnhrqegmscnnegahagvdfdm/ProjectName-Prefix.pch.pch ProjectName/ProjectName-Prefix.pch normal armv7 objective-c com.apple.compilers.llvm.clang.1_0.compiler
    cd /Users/lqi/Projects/ClientName/ProjectName-ios
    setenv LANG en_US.US-ASCII
    setenv PATH "/Applications/Xcode5-DP.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode5-DP.app/Contents/Developer/usr/bin:/Users/lqi/Tools/apache-ant-1.9.0/bin:/Users/lqi/Tools/groovy-2.1.1/bin:/Users/lqi/Tools/gradle-1.4/bin:/Users/lqi/Tools/scala-2.10.1/bin:/Users/lqi/Tools/apache-maven-3.0.5/bin:/Users/lqi/Projects/LQRDG/oclint/build/oclint-release/bin:/Users/lqi/.rvm/gems/ruby-1.9.3-p327/bin:/Users/lqi/.rvm/gems/ruby-1.9.3-p327@global/bin:/Users/lqi/.rvm/rubies/ruby-1.9.3-p327/bin:/Users/lqi/.rvm/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin"
    /Applications/Xcode5-DP.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x objective-c-header -arch armv7 -fmessage-length=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit=0 -std=gnu99 -fobjc-arc -Wno-trigraphs -fpascal-strings -O0 -Wno-missing-field-initializers -Wno-missing-prototypes -Wno-implicit-atomic-properties -Wno-receiver-is-weak -Wno-arc-repeated-use-of-weak -Wduplicate-method-match -Wno-missing-braces -Wparentheses -Wswitch -Wno-unused-function -Wno-unused-label -Wno-unused-parameter -Wunused-variable -Wunused-value -Wempty-body -Wuninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wno-constant-conversion -Wno-int-conversion -Wno-bool-conversion -Wno-enum-conversion -Wno-shorten-64-to-32 -Wpointer-sign -Wno-newline-eof -Wno-selector -Wno-strict-selector-match -Wno-undeclared-selector -Wno-deprecated-implementations -DDEBUG=1 -isysroot /Applications/Xcode5-DP.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -fstrict-aliasing -Wprotocol -Wdeprecated-declarations -g -Wno-sign-conversion -miphoneos-version-min=6.0 -I/Users/lqi/Library/Developer/Xcode/DerivedData/ProjectName-cvncefyloqlfqlamzkxkzajraozj/Build/Intermediates/ProjectName.build/Debug-iphoneos/ProjectName.build/ProjectName.hmap -I/Users/lqi/Library/Developer/Xcode/DerivedData/ProjectName-cvncefyloqlfqlamzkxkzajraozj/Build/Products/Debug-iphoneos/include -I/Users/lqi/Projects/ClientName/ProjectName-ios/Pods/Headers -I/Users/lqi/Projects/ClientName/ProjectName-ios/Pods/Headers/AFNetworking -I/Users/lqi/Projects/ClientName/ProjectName-ios/Pods/Headers/SVProgressHUD -I/Users/lqi/Library/Developer/Xcode/DerivedData/ProjectName-cvncefyloqlfqlamzkxkzajraozj/Build/Intermediates/ProjectName.build/Debug-iphoneos/ProjectName.build/DerivedSources/armv7 -I/Users/lqi/Library/Developer/Xcode/DerivedData/ProjectName-cvncefyloqlfqlamzkxkzajraozj/Build/Intermediates/ProjectName.build/Debug-iphoneos/ProjectName.build/DerivedSources -F/Users/lqi/Library/Developer/Xcode/DerivedData/ProjectName-cvncefyloqlfqlamzkxkzajraozj/Build/Products/Debug-iphoneos --serialize-diagnostics /Users/lqi/Library/Developer/Xcode/DerivedData/ProjectName-cvncefyloqlfqlamzkxkzajraozj/Build/Intermediates/PrecompiledHeaders/ProjectName-Prefix-girwpdnhrqegmscnnegahagvdfdm/ProjectName-Prefix.pch.dia -MMD -MT dependencies -MF /Users/lqi/Library/Developer/Xcode/DerivedData/ProjectName-cvncefyloqlfqlamzkxkzajraozj/Build/Intermediates/PrecompiledHeaders/ProjectName-Prefix-girwpdnhrqegmscnnegahagvdfdm/ProjectName-Prefix.pch.d -c /Users/lqi/Projects/ClientName/ProjectName-ios/ProjectName/ProjectName-Prefix.pch -o /Users/lqi/Library/Developer/Xcode/DerivedData/ProjectName-cvncefyloqlfqlamzkxkzajraozj/Build/Intermediates/PrecompiledHeaders/ProjectName-Prefix-girwpdnhrqegmscnnegahagvdfdm/ProjectName-Prefix.pch.pch
```