linker command failed with exit code 1 (use -v to see invocation)问题

    cd /Users/kong/Desktop/SearchTest    export IPHONEOS_DEPLOYMENT_TARGET=8.1    export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.1.sdk -L/Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator -F/Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator -filelist /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/SearchTest.LinkFileList -Xlinker -rpath -Xlinker @executable_path/Frameworks -mios-simulator-version-min=8.1 -Xlinker -objc_abi_version -Xlinker 2 -ObjC -lFMDB -lMBProgressHUD -lOnboard -lsqlite3 -framework CoreGraphics -fobjc-arc -fobjc-link-runtime -lPods -Xlinker -dependency_info -Xlinker /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/SearchTest_dependency_info.dat -o /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/SearchTest.app/SearchTestduplicate symbol _OBJC_IVAR_$_FMStatement._query in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMDatabase._checkedOut in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMDatabase._isExecutingStatement in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_CLASS_$_FMStatement in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_METACLASS_$_FMStatement in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMDatabase._dateFormat in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMDatabase._shouldCacheStatements in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMDatabase._cachedStatements in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMDatabase._openResultSets in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMDatabase._logsErrors in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMDatabase._crashOnErrors in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMDatabase._openFunctions in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMDatabase._traceExecution in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_METACLASS_$_FMDatabase in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMStatement._inUse in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMDatabase._startBusyRetryTime in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)duplicate symbol _OBJC_IVAR_$_FMDatabase._db in:    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Intermediates/SearchTest.build/Debug-iphonesimulator/SearchTest.build/Objects-normal/x86_64/FMDatabase.o    /Users/kong/Library/Developer/Xcode/DerivedData/SearchTest-faigphimlzmhvngrdhmoblsxfvcr/Build/Products/Debug-iphonesimulator/libFMDB.a(FMDatabase.o)ld: 25 duplicate symbols for architecture x86_64clang: error: linker command failed with exit code 1 (use -v to see invocation)

检测原因就是FMDatabase重复导入的问题，删除一个即可