Изменение исходного файла расширения с .m на .mm сбой в Xcode 9.3 для проекта заставки

Сегодня я решил, что хочу закодировать Screen Saver, используя Xcode для моего Mac, и хотел сделать большую часть тяжелой работы в C ++. Исходя из моего предыдущего опыта смешивания C ++ и Objective-C ++, вам просто нужно изменить расширение исходных файлов .m на .mm, если вы хотите включить туда немного C ++.

Я сталкиваюсь с раздражающей проблемой, как бы то ни было. Если я делаю проект Xcode Screen Saver и ничего не делаю, кроме переименования исходного TestScreenSaverView.m подать в TestScreenSaverView.mmСкринсейвер переходит от компиляции и связывания в порядке к компиляции и возникают проблемы с компоновкой. Обратите внимание, что кроме изменения расширения файлов, я не добавил никакого нового кода. Вот вывод журнала:

Showing Recent Issues
Check dependencies

Write auxiliary files

write-file /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/TestScreensaver.hmap
write-file /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/TestScreensaver-generated-files.hmap
write-file /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/TestScreensaver-all-target-headers.hmap
write-file /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/TestScreensaver-own-target-headers.hmap
write-file /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/TestScreensaver-project-headers.hmap
write-file /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/TestScreensaver-all-non-framework-target-headers.hmap
/bin/mkdir -p /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/Objects-normal/x86_64
write-file /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/Objects-normal/x86_64/TestScreensaver.LinkFileList

Create product structure

/bin/mkdir -p /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Products/Debug/TestScreensaver.saver/Contents
/bin/mkdir -p /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Products/Debug/TestScreensaver.saver/Contents/MacOS

ProcessInfoPlistFile /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Products/Debug/TestScreensaver.saver/Contents/Info.plist TestScreensaver/Info.plist
cd /Users/cjh/Documents/code/swift/TestScreensaver
builtin-infoPlistUtility /Users/cjh/Documents/code/swift/TestScreensaver/TestScreensaver/Info.plist -expandbuildsettings -platform macosx -o /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Products/Debug/TestScreensaver.saver/Contents/Info.plist

CompileC /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/Objects-normal/x86_64/TestScreensaverView.o TestScreensaver/TestScreensaverView.mm normal x86_64 objective-c++ com.apple.compilers.llvm.clang.1_0.compiler
cd /Users/cjh/Documents/code/swift/TestScreensaver
export LANG=en_US.US-ASCII
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x objective-c++ -arch x86_64 -fmessage-length=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit=0 -std=gnu++14 -stdlib=libc++ -fobjc-arc -fobjc-weak -fmodules -gmodules -fmodules-cache-path=/Users/cjh/Library/Developer/Xcode/DerivedData/ModuleCache.noindex -fmodules-prune-interval=86400 -fmodules-prune-after=345600 -fbuild-session-file=/Users/cjh/Library/Developer/Xcode/DerivedData/ModuleCache.noindex/Session.modulevalidation -fmodules-validate-once-per-build-session -Wnon-modular-include-in-framework-module -Werror=non-modular-include-in-framework-module -Wno-trigraphs -fpascal-strings -O0 -fno-common -Wno-missing-field-initializers -Wno-missing-prototypes -Werror=return-type -Wdocumentation -Wunreachable-code -Wno-implicit-atomic-properties -Werror=deprecated-objc-isa-usage -Werror=objc-root-class -Wno-arc-repeated-use-of-weak -Wimplicit-retain-self -Wno-non-virtual-dtor -Wno-overloaded-virtual -Wno-exit-time-destructors -Wduplicate-method-match -Wno-missing-braces -Wparentheses -Wswitch -Wunused-function -Wno-unused-label -Wno-unused-parameter -Wunused-variable -Wunused-value -Wempty-body -Wuninitialized -Wconditional-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wconstant-conversion -Wint-conversion -Wbool-conversion -Wenum-conversion -Wno-float-conversion -Wnon-literal-null-conversion -Wobjc-literal-conversion -Wshorten-64-to-32 -Wno-newline-eof -Wno-selector -Wno-strict-selector-match -Wundeclared-selector -Wdeprecated-implementations -Wno-c++11-extensions -DDEBUG=1 -DOBJC_OLD_DISPATCH_PROTOTYPES=0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -fasm-blocks -fstrict-aliasing -Wprotocol -Wdeprecated-declarations -Winvalid-offsetof -mmacosx-version-min=10.13 -g -fvisibility-inlines-hidden -Wno-sign-conversion -Winfinite-recursion -Wmove -Wcomma -Wblock-capture-autoreleasing -Wstrict-prototypes -Wrange-loop-analysis -Wunguarded-availability -index-store-path /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Index/DataStore -iquote /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/TestScreensaver-generated-files.hmap -I/Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/TestScreensaver-own-target-headers.hmap -I/Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/TestScreensaver-all-target-headers.hmap -iquote /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/TestScreensaver-project-headers.hmap -I/Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Products/Debug/include -I/Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/DerivedSources/x86_64 -I/Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/DerivedSources -F/Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Products/Debug -MMD -MT dependencies -MF /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/Objects-normal/x86_64/TestScreensaverView.d --serialize-diagnostics /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/Objects-normal/x86_64/TestScreensaverView.dia -c /Users/cjh/Documents/code/swift/TestScreensaver/TestScreensaver/TestScreensaverView.mm -o /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/Objects-normal/x86_64/TestScreensaverView.o

Ld /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Products/Debug/TestScreensaver.saver/Contents/MacOS/TestScreensaver normal x86_64
cd /Users/cjh/Documents/code/swift/TestScreensaver
export MACOSX_DEPLOYMENT_TARGET=10.13
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -bundle -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -L/Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Products/Debug -F/Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Products/Debug -filelist /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/Objects-normal/x86_64/TestScreensaver.LinkFileList -mmacosx-version-min=10.13 -Xlinker -object_path_lto -Xlinker /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/Objects-normal/x86_64/TestScreensaver_lto.o -Xlinker -export_dynamic -Xlinker -no_deduplicate -stdlib=libc++ -fobjc-arc -fobjc-link-runtime -ObjC -lc++ -Xlinker -dependency_info -Xlinker /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Intermediates.noindex/TestScreensaver.build/Debug/TestScreensaver.build/Objects-normal/x86_64/TestScreensaver_dependency_info.dat -o /Users/cjh/Library/Developer/Xcode/DerivedData/TestScreensaver-dufowvmnhdeakfekvozrelyhhccq/Build/Products/Debug/TestScreensaver.saver/Contents/MacOS/TestScreensaver

Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_ScreenSaverView", referenced from:
_OBJC_CLASS_$_TestScreensaverView in TestScreensaverView.o
"_OBJC_METACLASS_$_ScreenSaverView", referenced from:
_OBJC_METACLASS_$_TestScreensaverView in TestScreensaverView.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)Activity Log Complete    6/4/18, 2:06 PM

Не совсем уверен, в чем проблема, потому что у меня никогда не было проблем раньше. У кого-нибудь есть подсказка, в чем может быть проблема?

Для полноты ниже приведен код, который инициализирует проект:

TestScreensaverView.h

//
//  TestScreensaverView.h
//  TestScreensaver
//
//  Created by C. Howard on 6/4/18.
//  Copyright © 2018 C. Howard. All rights reserved.
//

#import <ScreenSaver/ScreenSaver.h>

@interface TestScreensaverView : ScreenSaverView

@end

TestScreensaverView.mm (первоначально TestScreensaverView.m)

//
//  TestScreensaverView.m
//  TestScreensaver
//
//  Created by C. Howard on 6/4/18.
//  Copyright © 2018 C. Howard. All rights reserved.
//

#import "TestScreensaverView.h"
@implementation TestScreensaverView

- (instancetype)initWithFrame:(NSRect)frame isPreview:(BOOL)isPreview
{
self = [super initWithFrame:frame isPreview:isPreview];
if (self) {
[self setAnimationTimeInterval:1/30.0];
}
return self;
}

- (void)startAnimation
{
[super startAnimation];
}

- (void)stopAnimation
{
[super stopAnimation];
}

- (void)drawRect:(NSRect)rect
{
[super drawRect:rect];
}

- (void)animateOneFrame
{
return;
}

- (BOOL)hasConfigureSheet
{
return NO;
}

- (NSWindow*)configureSheet
{
return nil;
}

@end