This is to give some idea about how XCode runs the compiler -------------- LANG=en_US.US-ASCII CC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang Warning options: ----------- -Wnon-modular-include-in-framework-module -Werror=non-modular-include-in-framework-module -Wno-trigraphs -Wno-missing-field-initializers -Wno-missing-prototypes -Werror=return-type -Wdocumentation -Wunreachable-code -Werror=deprecated-objc-isa-usage -Werror=objc-root-class -Wno-non-virtual-dtor -Wno-overloaded-virtual -Wno-exit-time-destructors -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-c++11-extensions -Wdeprecated-declarations -Winvalid-offsetof -Wno-sign-conversion -Winfinite-recursion -Wmove -Wcomma -Wblock-capture-autoreleasing -Wstrict-prototypes -Wrange-loop-analysis -Wunguarded-availability Might as well just do -Wall Flags ----- FLAGS=\ -fmessage-length=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit=0 \ -fmodules -gmodules -fmodules-cache-path=/Users/jryland/Library/Developer/Xcode/DerivedData/ModuleCache \ -fmodules-prune-interval=86400 -fmodules-prune-after=345600 -fvisibility-inlines-hidden \ -fbuild-session-file=/Users/jryland/Library/Developer/Xcode/DerivedData/ModuleCache/Session.modulevalidation \ -fmodules-validate-once-per-build-session -fpascal-strings -fno-common -fasm-blocks -fstrict-aliasing $(CC) -x c++ -arch x86_64 -Wall $(FLAGS) -O0 -std=gnu++14 -stdlib=libc++ -DDEBUG=1 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -mmacosx-version-min=10.13 -g -index-store-path $(DEST)/Index/DataStore -iquote $(DEST)/Build/Intermediates.noindex/UiToolkitTest.build/Debug/UiToolkitTest.build/UiToolkitTest-generated-files.hmap -I$(DEST)/Build/Intermediates.noindex/UiToolkitTest.build/Debug/UiToolkitTest.build/UiToolkitTest-own-target-headers.hmap -I$(DEST)/Build/Intermediates.noindex/UiToolkitTest.build/Debug/UiToolkitTest.build/UiToolkitTest-all-target-headers.hmap -iquote $(DEST)/Build/Intermediates.noindex/UiToolkitTest.build/Debug/UiToolkitTest.build/UiToolkitTest-project-headers.hmap -I$(DEST)/Build/Products/Debug/include -I../include -I$(DEST)/Build/Intermediates.noindex/UiToolkitTest.build/Debug/UiToolkitTest.build/DerivedSources/x86_64 -I$(DEST)/Build/Intermediates.noindex/UiToolkitTest.build/Debug/UiToolkitTest.build/DerivedSources -F$(DEST)/Build/Products/Debug -MMD -MT dependencies -MF $(DEST)/Build/Intermediates.noindex/UiToolkitTest.build/Debug/UiToolkitTest.build/Objects-normal/x86_64/Window.d --serialize-diagnostics $(DEST)/Build/Intermediates.noindex/UiToolkitTest.build/Debug/UiToolkitTest.build/Objects-normal/x86_64/Window.dia -c /Users/jryland/Code/Working/research/ui/toolkit/src/Window.cpp -o $(DEST)/Build/Intermediates.noindex/UiToolkitTest.build/Debug/UiToolkitTest.build/Objects-normal/x86_64/Window.o