Encountered an error while building from source code on macOS 10.14 with Xcode 11.3.1

[hao-lh]

Building environment:
Xcode: Version 11.3.1 (11C505)
macOS Mojave 10.14.6 (18G9323)

Building details:

xcodebuild -target SwitchAudioSource
note: Using new build system
note: Planning build
note: Constructing build description
CreateBuildDirectory ~/Code/switchaudio-osx/build (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx
    builtin-create-build-directory ~/Code/switchaudio-osx/build

WriteAuxiliaryFile ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/DerivedSources/Entitlements.plist (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx
    write-file ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/DerivedSources/Entitlements.plist

ProcessProductPackaging "" ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource.xcent (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx


Entitlements:

{
    "com.apple.security.get-task-allow" = 1;
}


    builtin-productPackagingUtility -entitlements -format xml -o ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource.xcent

WriteAuxiliaryFile ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource.hmap (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx
    write-file ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource.hmap

WriteAuxiliaryFile ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-project-headers.hmap (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx
    write-file ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-project-headers.hmap

WriteAuxiliaryFile ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/all-product-headers.yaml (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx
    write-file ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/all-product-headers.yaml

WriteAuxiliaryFile ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-own-target-headers.hmap (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx
    write-file ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-own-target-headers.hmap

WriteAuxiliaryFile ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-generated-files.hmap (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx
    write-file ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-generated-files.hmap

WriteAuxiliaryFile ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-all-target-headers.hmap (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx
    write-file ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-all-target-headers.hmap

WriteAuxiliaryFile ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-all-non-framework-target-headers.hmap (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx
    write-file ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-all-non-framework-target-headers.hmap

CompileC ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/Objects-normal/x86_64/audio_switch.o ~/Code/switchaudio-osx/audio_switch.c normal x86_64 c com.apple.compilers.llvm.clang.1_0.compiler (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx
    export LANG=en_US.US-ASCII
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x c -target x86_64-apple-macos10.6 -fmessage-length=179 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit=0 -fcolor-diagnostics -std=c99 -Wno-trigraphs -fpascal-strings -Os -fno-common -Wno-missing-field-initializers -Wno-missing-prototypes -Wunreachable-code -Wno-missing-braces -Wparentheses -Wswitch -Wunused-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 -Wconstant-conversion -Wint-conversion -Wbool-conversion -Wenum-conversion -Wno-float-conversion -Wnon-literal-null-conversion -Wobjc-literal-conversion -Wshorten-64-to-32 -Wpointer-sign -Wno-newline-eof -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -fasm-blocks -fstrict-aliasing -Wdeprecated-declarations -g -fvisibility=hidden -Wno-sign-conversion -Winfinite-recursion -Wcomma -Wblock-capture-autoreleasing -Wstrict-prototypes -Wno-semicolon-before-method-body -iquote ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-generated-files.hmap -I~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-own-target-headers.hmap -I~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-all-target-headers.hmap -iquote ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-project-headers.hmap -I~/Code/switchaudio-osx/build/Release/include -I~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/DerivedSources-normal/x86_64 -I~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/DerivedSources/x86_64 -I~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/DerivedSources -F~/Code/switchaudio-osx/build/Release -MMD -MT dependencies -MF ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/Objects-normal/x86_64/audio_switch.d --serialize-diagnostics ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/Objects-normal/x86_64/audio_switch.dia -c ~/Code/switchaudio-osx/audio_switch.c -o ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/Objects-normal/x86_64/audio_switch.o
~/Code/switchaudio-osx/audio_switch.c:210:16: warning: enumeration value 'kAudioTypeUnknown' not handled in switch [-Wswitch]
        switch(typeRequested) {
               ^
~/Code/switchaudio-osx/audio_switch.c:210:16: note: add missing switch cases
        switch(typeRequested) {
               ^
~/Code/switchaudio-osx/audio_switch.c:286:43: warning: passing 'const char *' to parameter of type 'char *' discards qualifiers
      [-Wincompatible-pointer-types-discards-qualifiers]
        if (CFStringGetCString(deviceUID, deviceUID_string, maxSize, kCFStringEncodingUTF8)) {
                                          ^~~~~~~~~~~~~~~~
In file included from ~/Code/switchaudio-osx/audio_switch.c:30:
In file included from ~/Code/switchaudio-osx/audio_switch.h:33:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreServices.framework/Headers/CoreServices.h:19:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:49:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CFCalendar.h:16:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CFTimeZone.h:18:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CFString.h:333:57: note:
      passing argument to parameter 'buffer' here
Boolean CFStringGetCString(CFStringRef theString, char *buffer, CFIndex bufferSize, CFStringEncoding encoding);
                                                        ^
~/Code/switchaudio-osx/audio_switch.c:417:113: warning: incompatible integer to pointer conversion passing 'int' to parameter of type 'const void * _Nullable'
      [-Wint-conversion]
    OSStatus result = AudioObjectGetPropertyDataSize(deviceID, &propertyAddress, sizeof(AudioClassDescription), kAudioDevicePropertyScopeInput, &dataSize);
                                                                                                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ~/Code/switchaudio-osx/audio_switch.c:30:
In file included from ~/Code/switchaudio-osx/audio_switch.h:34:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreAudio.framework/Headers/CoreAudio.h:18:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreAudio.framework/Headers/AudioHardware.h:263:69: note:
      passing argument to parameter 'inQualifierData' here
                                const void* __nullable              inQualifierData,
                                                                    ^
~/Code/switchaudio-osx/audio_switch.c:601:21: warning: comparison between pointer and integer ('AudioDeviceID' (aka 'unsigned int') and 'void *')
    if (newDeviceID != nil) {
        ~~~~~~~~~~~ ^  ~~~
~/Code/switchaudio-osx/audio_switch.c:612:21: warning: comparison between pointer and integer ('AudioDeviceID' (aka 'unsigned int') and 'void *')
    if (newDeviceID != nil) {
        ~~~~~~~~~~~ ^  ~~~
~/Code/switchaudio-osx/audio_switch.c:623:21: warning: comparison between pointer and integer ('AudioDeviceID' (aka 'unsigned int') and 'void *')
    if (newDeviceID != nil) {
        ~~~~~~~~~~~ ^  ~~~
~/Code/switchaudio-osx/audio_switch.c:703:12: warning: enumeration values 'kAudioTypeUnknown' and 'kAudioTypeAll' not handled in switch [-Wswitch]
    switch(typeRequested) {
           ^
~/Code/switchaudio-osx/audio_switch.c:703:12: note: add missing switch cases
    switch(typeRequested) {
           ^
~/Code/switchaudio-osx/audio_switch.c:718:23: error: use of undeclared identifier 'kAudioObjectPropertyElementMain'; did you mean 'kAudioObjectPropertyElementName'?
        .mElement   = kAudioObjectPropertyElementMain,
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                      kAudioObjectPropertyElementName
In file included from ~/Code/switchaudio-osx/audio_switch.c:30:
In file included from ~/Code/switchaudio-osx/audio_switch.h:34:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreAudio.framework/Headers/CoreAudio.h:18:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreAudio.framework/Headers/AudioHardware.h:85:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/CoreAudio.framework/Headers/AudioHardwareBase.h:331:5: note:
      'kAudioObjectPropertyElementName' declared here
    kAudioObjectPropertyElementName         = 'lchn',
    ^
7 warnings and 1 error generated.

WriteAuxiliaryFile ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/Objects-normal/x86_64/SwitchAudioSource.LinkFileList (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx
    write-file ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/Objects-normal/x86_64/SwitchAudioSource.LinkFileList

CompileC ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/Objects-normal/x86_64/main.o ~/Code/switchaudio-osx/main.c normal x86_64 c com.apple.compilers.llvm.clang.1_0.compiler (in target 'SwitchAudioSource' from project 'AudioSwitcher')
    cd ~/Code/switchaudio-osx
    export LANG=en_US.US-ASCII
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x c -target x86_64-apple-macos10.6 -fmessage-length=179 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit=0 -fcolor-diagnostics -std=c99 -Wno-trigraphs -fpascal-strings -Os -fno-common -Wno-missing-field-initializers -Wno-missing-prototypes -Wunreachable-code -Wno-missing-braces -Wparentheses -Wswitch -Wunused-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 -Wconstant-conversion -Wint-conversion -Wbool-conversion -Wenum-conversion -Wno-float-conversion -Wnon-literal-null-conversion -Wobjc-literal-conversion -Wshorten-64-to-32 -Wpointer-sign -Wno-newline-eof -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -fasm-blocks -fstrict-aliasing -Wdeprecated-declarations -g -fvisibility=hidden -Wno-sign-conversion -Winfinite-recursion -Wcomma -Wblock-capture-autoreleasing -Wstrict-prototypes -Wno-semicolon-before-method-body -iquote ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-generated-files.hmap -I~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-own-target-headers.hmap -I~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-all-target-headers.hmap -iquote ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/SwitchAudioSource-project-headers.hmap -I~/Code/switchaudio-osx/build/Release/include -I~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/DerivedSources-normal/x86_64 -I~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/DerivedSources/x86_64 -I~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/DerivedSources -F~/Code/switchaudio-osx/build/Release -MMD -MT dependencies -MF ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/Objects-normal/x86_64/main.d --serialize-diagnostics ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/Objects-normal/x86_64/main.dia -c ~/Code/switchaudio-osx/main.c -o ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/Objects-normal/x86_64/main.o

** BUILD FAILED **

The following build commands failed:
	CompileC ~/Code/switchaudio-osx/build/AudioSwitcher.build/Release/SwitchAudioSource.build/Objects-normal/x86_64/audio_switch.o ~/Code/switchaudio-osx/audio_switch.c normal x86_64 c com.apple.compilers.llvm.clang.1_0.compiler
(1 failure)
make: *** [build/Release/SwitchAudioSource] Error 65

I see there is a building error occurred from audio_switch.c:718:23: error: use of undeclared identifier 'kAudioObjectPropertyElementMain', could you help take a look?
Thanks.

[igorbernstein]

Looking at the apple docs that symbol was added in MacOS 12 (Monterey). Which is 3 versions newer than Mojave (10.14). So I suspect the quick answer is that switch audio-osx doesn't support your version of os x.

It might be possible to add backwards compatibility using older apis, but I think you are better off upgrading to a newer version of os x. (if your hardware is too old, take a look at oclp

[ryandesign]

But the readme suggests it should work on 10.7 and newer.

switchaudio-osx/README.md

Line 13 in 6659247

This is a command-line utility only and has no graphical user interface. Tested on OS 10.7 - 11.2.

[igorbernstein]

Hmm, maybe the readme is out of date? It looks like kAudioObjectPropertyElementMain symbol was added in 1.2.0. Can you build v 1.1.0?

[RobK88]

Given that new symbols only found in macOS 12 Monterey are now being used, it looks like switchaudio-osx now only runs on macOS 12 Monterey and newer. This can be confirmed by looking at the status on MacPorts:

https://ports.macports.org/port/switchaudio-osx/details/

If this is the case, the readme.md file on the Github project page should be updated accordingly. Or the source code should be changed to support the 10.7 and later.

[RobK88]

@igorbernstein -- I can confirm that v1.1.0 still builds and runs find on Lion Mac OS X 10.7.5 (and presumably on newer macOS releases such as Mojave).

But the versions 1.2.0 to 1.2.2 do not build. But I see a different build error on Lion than that reported for Mojave.

fatal error: 'CoreAudio/AudioHardwareBase.h' file not found
#include <CoreAudio/AudioHardwareBase.h>
         ^
1 error generated.