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Compile error in 4.6.1: "PCH file built from a different branch"
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Compile error in 4.6.1: "PCH file built from a different branch"

  • Subject: Compile error in 4.6.1: "PCH file built from a different branch"
  • From: Jens Alfke <email@hidden>
  • Date: Thu, 21 Mar 2013 14:44:36 -0700
Since upgrading from Xcode 4.6 to 4.6.1, I’m getting intermittent-but-frequent compiler errors building one specific target:

error: PCH file built from a different branch ((clang-425.0.24)) than the compiler ((clang-425.0.27))

I thought this might be due to a dependency problem with leftover precompiled headers; but clean builds don’t make it go away, nor does deleting the project’s build folder.

Then I thought the command-line tools were out of date, but they don’t seem to be:
$ clang --version
Apple LLVM version 4.2 (clang-425.0.27) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.3.0
Thread model: posix

(Although this is apparently the native clang, whereas the target that gets these errors is for iOS.)

Below is the build command and output in case it helps.

—Jens

CompileC "build/CouchbaseLite.build/Debug-iphonesimulator/Listener iOS Library.build/Objects-normal/i386/HTTPAuthenticationRequest.o" vendor/CocoaHTTPServer/Core/HTTPAuthenticationRequest.m normal i386 objective-c com.apple.compilers.llvm.clang.1_0.compiler
    cd /Couchbase/CouchbaseLite
    setenv LANG en_US.US-ASCII
    setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin:/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/libexec:/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/local/bin:/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/usr/bin:/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/usr/local/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/local/bin:/Applications/Xcode.app/Contents/Developer/Tools:/usr/bin:/bin:/usr/sbin:/sbin"
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x objective-c -arch i386 -fmessage-length=0 -std=gnu99 -fobjc-arc -Wno-trigraphs -fpascal-strings -O0 -Werror -Wno-missing-field-initializers -Wmissing-prototypes -Wreturn-type -Wno-implicit-atomic-properties -Wobjc-missing-property-synthesis -Wno-receiver-is-weak -Wduplicate-method-match -Wformat -Wno-missing-braces -Wparentheses -Wswitch -Wunused-function -Wno-unused-label -Wno-unused-parameter -Wunused-variable -Wunused-value -Wno-empty-body -Wuninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wno-constant-conversion -Wno-int-conversion -Wno-enum-conversion -Wshorten-64-to-32 -Wpointer-sign -Wno-newline-eof -Wno-selector -Wno-strict-selector-match -Wundeclared-selector -Wno-deprecated-implementations -DDEBUG=1 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk -fexceptions -fasm-blocks -fstrict-aliasing -Wprotocol -Wdeprecated-declarations -g -Wno-sign-conversion -fobjc-abi-version=2 -fobjc-legacy-dispatch -mios-simulator-version-min=5.0 -iquote "/Couchbase/CouchbaseLite/build/CouchbaseLite.build/Debug-iphonesimulator/Listener iOS Library.build/CouchbaseLiteListener-generated-files.hmap" "-I/Couchbase/CouchbaseLite/build/CouchbaseLite.build/Debug-iphonesimulator/Listener iOS Library.build/CouchbaseLiteListener-own-target-headers.hmap" "-I/Couchbase/CouchbaseLite/build/CouchbaseLite.build/Debug-iphonesimulator/Listener iOS Library.build/CouchbaseLiteListener-all-target-headers.hmap" -iquote "/Couchbase/CouchbaseLite/build/CouchbaseLite.build/Debug-iphonesimulator/Listener iOS Library.build/CouchbaseLiteListener-project-headers.hmap" -I/Couchbase/CouchbaseLite/build/CouchbaseLite/Build/Products/Debug-iphonesimulator/include -I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include -I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include -I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include "-I/Couchbase/CouchbaseLite/build/CouchbaseLite.build/Debug-iphonesimulator/Listener iOS Library.build/DerivedSources/i386" "-I/Couchbase/CouchbaseLite/build/CouchbaseLite.build/Debug-iphonesimulator/Listener iOS Library.build/DerivedSources" -Wall -Wformat-security -Wshorten-64-to-32 -Wmissing-declarations -F/Couchbase/CouchbaseLite/build/CouchbaseLite/Build/Products/Debug-iphonesimulator -include /var/folders/4f/mvdftm3d5ss0ystm0m2q8q3m0000gn/C/com.apple.Xcode.501/SharedPrecompiledHeaders/CouchbaseLitePrefix-alacozqkwfsxiufumtuzemcdtdlb/CouchbaseLitePrefix.h -MMD -MT dependencies -MF "/Couchbase/CouchbaseLite/build/CouchbaseLite.build/Debug-iphonesimulator/Listener iOS Library.build/Objects-normal/i386/HTTPAuthenticationRequest.d" --serialize-diagnostics "/Couchbase/CouchbaseLite/build/CouchbaseLite.build/Debug-iphonesimulator/Listener iOS Library.build/Objects-normal/i386/HTTPAuthenticationRequest.dia" -c /Couchbase/CouchbaseLite/vendor/CocoaHTTPServer/Core/HTTPAuthenticationRequest.m -o "/Couchbase/CouchbaseLite/build/CouchbaseLite.build/Debug-iphonesimulator/Listener iOS Library.build/Objects-normal/i386/HTTPAuthenticationRequest.o"
error: PCH file built from a different branch ((clang-425.0.24)) than the compiler ((clang-425.0.27))
1 error generated.

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