Can't compile code with __MAC_OS_X_VERSION_MIN_REQUIRED undefined

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Created Feb ’24

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I've been using a code that pass -U__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ during compilation. The code was compiling well for a while. I haven't been using that project for a while, but recently found out that my project start failing to build with errors:

In file included from my_project/main_app.cpp:52:

In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/mach/mach_time.h:32:

In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/mach/mach_types.h:109:

In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/mach/vm_region.h:47:

In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/mach/machine/vm_param.h:33:

In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/mach/i386/vm_param.h:97:

/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/mach/vm_page_size.h:59:44: error: expected ';' after top level declarator

extern  vm_size_t       vm_kernel_page_size     __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_7_0);

My /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/Availability.h file contains

#ifdef __IPHONE_OS_VERSION_MIN_REQUIRED
...
#elif defined(__MAC_OS_X_VERSION_MIN_REQUIRED)
...
#else
    #define __OSX_AVAILABLE_STARTING(_osx, _ios)
    #define __OSX_AVAILABLE_BUT_DEPRECATED(_osxIntro, _osxDep, _iosIntro, _iosDep)
    #define __OSX_AVAILABLE_BUT_DEPRECATED_MSG(_osxIntro, _osxDep, _iosIntro, _iosDep, _msg)
#endif

but the last #else case is never hit because /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/AvailabilityInternal.h contains:

#ifndef __MAC_OS_X_VERSION_MIN_REQUIRED
    #if defined(__has_builtin) && __has_builtin(__is_target_os)
        #if __is_target_os(macos)
            #define __MAC_OS_X_VERSION_MIN_REQUIRED __ENVIRONMENT_OS_VERSION_MIN_REQUIRED__
            #define __MAC_OS_X_VERSION_MAX_ALLOWED __MAC_14_2
        #endif
    #elif  __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
        #define __MAC_OS_X_VERSION_MIN_REQUIRED __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
        #define __MAC_OS_X_VERSION_MAX_ALLOWED __MAC_14_2
    #endif /*  __has_builtin(__is_target_os) && __is_target_os(macos) */
#endif /* __MAC_OS_X_VERSION_MIN_REQUIRED */

So in combination with my initial -U__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ option the #define __MAC_OS_X_VERSION_MIN_REQUIRED __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ produce an empty define.

So the question to apple developers: could you please update #elif __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ to #elif defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)? Or even change #ifndef __MAC_OS_X_VERSION_MIN_REQUIRED to #if !defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)?

Otherwise the #else case in Availability.h described above does not make any sense.

Best regards, Petro

Boost

Answer 1

DTS Engineer OP

Apple

Feb ’24

I've been using a code that pass -U__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ during compilation.

Why? What were you trying to achieve by passing in that option?

Also, it looks like you’re using Xcode. Is that right? If so, what version?

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