Fix compiling on Linux

[asdfzxcvbn]

the issue results from using @available. manually defining int __isOSVersionAtLeast fixes compiling on linux.

[NSExceptional]

I am hesitant to remove an entire syntax just to appease Linux. Does whatever compiler you're using on Linux really not support @available?

You say manually defining __isOSVersionAtLeast fixes it, but your PR does not define it?

[asdfzxcvbn]

I am hesitant to remove an entire syntax just to appease Linux. Does whatever compiler you're using on Linux really not support @available?

i looked up the issue, it's a problem with the SDKs available on linux not having the symbol needed for @available. source

You say manually defining __isOSVersionAtLeast fixes it, but your PR does not define it?

sorry, i originally was defining it if you see my original commit, however i switched to the SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO macro since defining __isOSVersionAtLeast would break compiling on macOS.

[NSExceptional]

Ah. I think you can get around that with a preprocessor macro, like

#ifdef APPLE
int __isOSVersionAtLeast = ...
#endif

Google around a bit to find the right macro

[asdfzxcvbn]

Ah. I think you can get around that with a preprocessor macro, like

#ifdef APPLE
int __isOSVersionAtLeast = ...
#endif

Google around a bit to find the right macro

yep, i tried that yesterday, for some reason it wouldn't work. the method was still being defined even though i used #ifdef __APPLE__ on linux. strange, honestly

[NSExceptional]

Can you paste the exact code you tried? This should work… Were you using #ifdef instead of #ifndef? I accidentally used #ifdef in my example

#ifndef __APPLE__
int __isOSVersionAtLeast(int major, int minor, int patch) {
    NSOperatingSystemVersion version;
    version.majorVersion = major;
    version.minorVersion = minor;
    version.patchVersion = patch;
    return [NSProcessInfo.processInfo isOperatingSystemAtLeastVersion:version];
}
#endif

[asdfzxcvbn]

yeah i copy pasted that, i still get the following:

Undefined symbols for architecture arm64:
  "___isOSVersionAtLeast", referenced from:
      -[FLEXExplorerViewController statusWindow] in FLEXExplorerViewController.m.51039443.o
      -[FLEXNavigationController viewWillAppear:] in FLEXNavigationController.m.51039443.o
ld: symbol(s) not found for architecture arm64
clang-11: error: linker command failed with exit code 1 (use -v to see invocation)

[NSExceptional]

Can you try running clang somefile.m -dM -E and pasting the output here for me?

[asdfzxcvbn]

Can you try running clang somefile.m -dM -E and pasting the output here for me?

huh? just on a random file?

[NSExceptional]

I think so; supposedly it will output all the available preprocessor macros. It's the first step to debugging a better way to approach this

[asdfzxcvbn]

I think so; supposedly it will output all the available preprocessor macros. It's the first step to debugging a better way to approach this

``` $ clang FLEXExplorerViewController.m -dM -E In file included from FLEXExplorerViewController.m:9: ./FLEXExplorerViewController.h:9:9: fatal error: 'FLEXExplorerToolbar.h' file not found 9 | #import "FLEXExplorerToolbar.h" | ^~~~~~~~~~~~~~~~~~~~~~~ #define IBAction void)__attribute__((ibaction) #define IBInspectable #define IBOutlet __attribute__((iboutlet)) #define IBOutletCollection(ClassName) __attribute__((iboutletcollection(ClassName))) #define IB_DESIGNABLE #define OBJC_NEW_PROPERTIES 1 #define _LP64 1 #define __ATOMIC_ACQUIRE 2 #define __ATOMIC_ACQ_REL 4 #define __ATOMIC_CONSUME 1 #define __ATOMIC_RELAXED 0 #define __ATOMIC_RELEASE 3 #define __ATOMIC_SEQ_CST 5 #define __BIGGEST_ALIGNMENT__ 16 #define __BITINT_MAXWIDTH__ 8388608 #define __BOOL_WIDTH__ 8 #define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__ #define __CHAR16_TYPE__ unsigned short #define __CHAR32_TYPE__ unsigned int #define __CHAR_BIT__ 8 #define __CLANG_ATOMIC_BOOL_LOCK_FREE 2 #define __CLANG_ATOMIC_CHAR16_T_LOCK_FREE 2 #define __CLANG_ATOMIC_CHAR32_T_LOCK_FREE 2 #define __CLANG_ATOMIC_CHAR_LOCK_FREE 2 #define __CLANG_ATOMIC_INT_LOCK_FREE 2 #define __CLANG_ATOMIC_LLONG_LOCK_FREE 2 #define __CLANG_ATOMIC_LONG_LOCK_FREE 2 #define __CLANG_ATOMIC_POINTER_LOCK_FREE 2 #define __CLANG_ATOMIC_SHORT_LOCK_FREE 2 #define __CLANG_ATOMIC_WCHAR_T_LOCK_FREE 2 #define __CONSTANT_CFSTRINGS__ 1 #define __DBL_DECIMAL_DIG__ 17 #define __DBL_DENORM_MIN__ 4.9406564584124654e-324 #define __DBL_DIG__ 15 #define __DBL_EPSILON__ 2.2204460492503131e-16 #define __DBL_HAS_DENORM__ 1 #define __DBL_HAS_INFINITY__ 1 #define __DBL_HAS_QUIET_NAN__ 1 #define __DBL_MANT_DIG__ 53 #define __DBL_MAX_10_EXP__ 308 #define __DBL_MAX_EXP__ 1024 #define __DBL_MAX__ 1.7976931348623157e+308 #define __DBL_MIN_10_EXP__ (-307) #define __DBL_MIN_EXP__ (-1021) #define __DBL_MIN__ 2.2250738585072014e-308 #define __DECIMAL_DIG__ __LDBL_DECIMAL_DIG__ #define __ELF__ 1 #define __FINITE_MATH_ONLY__ 0 #define __FLOAT128__ 1 #define __FLT16_DECIMAL_DIG__ 5 #define __FLT16_DENORM_MIN__ 5.9604644775390625e-8F16 #define __FLT16_DIG__ 3 #define __FLT16_EPSILON__ 9.765625e-4F16 #define __FLT16_HAS_DENORM__ 1 #define __FLT16_HAS_INFINITY__ 1 #define __FLT16_HAS_QUIET_NAN__ 1 #define __FLT16_MANT_DIG__ 11 #define __FLT16_MAX_10_EXP__ 4 #define __FLT16_MAX_EXP__ 16 #define __FLT16_MAX__ 6.5504e+4F16 #define __FLT16_MIN_10_EXP__ (-4) #define __FLT16_MIN_EXP__ (-13) #define __FLT16_MIN__ 6.103515625e-5F16 #define __FLT_DECIMAL_DIG__ 9 #define __FLT_DENORM_MIN__ 1.40129846e-45F #define __FLT_DIG__ 6 #define __FLT_EPSILON__ 1.19209290e-7F #define __FLT_HAS_DENORM__ 1 #define __FLT_HAS_INFINITY__ 1 #define __FLT_HAS_QUIET_NAN__ 1 #define __FLT_MANT_DIG__ 24 #define __FLT_MAX_10_EXP__ 38 #define __FLT_MAX_EXP__ 128 #define __FLT_MAX__ 3.40282347e+38F #define __FLT_MIN_10_EXP__ (-37) #define __FLT_MIN_EXP__ (-125) #define __FLT_MIN__ 1.17549435e-38F #define __FLT_RADIX__ 2 #define __FPCLASS_NEGINF 0x0004 #define __FPCLASS_NEGNORMAL 0x0008 #define __FPCLASS_NEGSUBNORMAL 0x0010 #define __FPCLASS_NEGZERO 0x0020 #define __FPCLASS_POSINF 0x0200 #define __FPCLASS_POSNORMAL 0x0100 #define __FPCLASS_POSSUBNORMAL 0x0080 #define __FPCLASS_POSZERO 0x0040 #define __FPCLASS_QNAN 0x0002 #define __FPCLASS_SNAN 0x0001 #define __FXSR__ 1 #define __GCC_ASM_FLAG_OUTPUTS__ 1 #define __GCC_ATOMIC_BOOL_LOCK_FREE 2 #define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 2 #define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 2 #define __GCC_ATOMIC_CHAR_LOCK_FREE 2 #define __GCC_ATOMIC_INT_LOCK_FREE 2 #define __GCC_ATOMIC_LLONG_LOCK_FREE 2 #define __GCC_ATOMIC_LONG_LOCK_FREE 2 #define __GCC_ATOMIC_POINTER_LOCK_FREE 2 #define __GCC_ATOMIC_SHORT_LOCK_FREE 2 #define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1 #define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 2 #define __GCC_HAVE_DWARF2_CFI_ASM 1 #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1 #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1 #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1 #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1 #define __GNUC_MINOR__ 2 #define __GNUC_PATCHLEVEL__ 1 #define __GNUC_STDC_INLINE__ 1 #define __GNUC__ 4 #define __GXX_ABI_VERSION 1002 #define __INT16_C_SUFFIX__ #define __INT16_FMTd__ "hd" #define __INT16_FMTi__ "hi" #define __INT16_MAX__ 32767 #define __INT16_TYPE__ short #define __INT32_C_SUFFIX__ #define __INT32_FMTd__ "d" #define __INT32_FMTi__ "i" #define __INT32_MAX__ 2147483647 #define __INT32_TYPE__ int #define __INT64_C_SUFFIX__ L #define __INT64_FMTd__ "ld" #define __INT64_FMTi__ "li" #define __INT64_MAX__ 9223372036854775807L #define __INT64_TYPE__ long int #define __INT8_C_SUFFIX__ #define __INT8_FMTd__ "hhd" #define __INT8_FMTi__ "hhi" #define __INT8_MAX__ 127 #define __INT8_TYPE__ signed char #define __INTMAX_C_SUFFIX__ L #define __INTMAX_FMTd__ "ld" #define __INTMAX_FMTi__ "li" #define __INTMAX_MAX__ 9223372036854775807L #define __INTMAX_TYPE__ long int #define __INTMAX_WIDTH__ 64 #define __INTPTR_FMTd__ "ld" #define __INTPTR_FMTi__ "li" #define __INTPTR_MAX__ 9223372036854775807L #define __INTPTR_TYPE__ long int #define __INTPTR_WIDTH__ 64 #define __INT_FAST16_FMTd__ "hd" #define __INT_FAST16_FMTi__ "hi" #define __INT_FAST16_MAX__ 32767 #define __INT_FAST16_TYPE__ short #define __INT_FAST16_WIDTH__ 16 #define __INT_FAST32_FMTd__ "d" #define __INT_FAST32_FMTi__ "i" #define __INT_FAST32_MAX__ 2147483647 #define __INT_FAST32_TYPE__ int #define __INT_FAST32_WIDTH__ 32 #define __INT_FAST64_FMTd__ "ld" #define __INT_FAST64_FMTi__ "li" #define __INT_FAST64_MAX__ 9223372036854775807L #define __INT_FAST64_TYPE__ long int #define __INT_FAST64_WIDTH__ 64 #define __INT_FAST8_FMTd__ "hhd" #define __INT_FAST8_FMTi__ "hhi" #define __INT_FAST8_MAX__ 127 #define __INT_FAST8_TYPE__ signed char #define __INT_FAST8_WIDTH__ 8 #define __INT_LEAST16_FMTd__ "hd" #define __INT_LEAST16_FMTi__ "hi" #define __INT_LEAST16_MAX__ 32767 #define __INT_LEAST16_TYPE__ short #define __INT_LEAST16_WIDTH__ 16 #define __INT_LEAST32_FMTd__ "d" #define __INT_LEAST32_FMTi__ "i" #define __INT_LEAST32_MAX__ 2147483647 #define __INT_LEAST32_TYPE__ int #define __INT_LEAST32_WIDTH__ 32 #define __INT_LEAST64_FMTd__ "ld" #define __INT_LEAST64_FMTi__ "li" #define __INT_LEAST64_MAX__ 9223372036854775807L #define __INT_LEAST64_TYPE__ long int #define __INT_LEAST64_WIDTH__ 64 #define __INT_LEAST8_FMTd__ "hhd" #define __INT_LEAST8_FMTi__ "hhi" #define __INT_LEAST8_MAX__ 127 #define __INT_LEAST8_TYPE__ signed char #define __INT_LEAST8_WIDTH__ 8 #define __INT_MAX__ 2147483647 #define __INT_WIDTH__ 32 #define __LDBL_DECIMAL_DIG__ 21 #define __LDBL_DENORM_MIN__ 3.64519953188247460253e-4951L #define __LDBL_DIG__ 18 #define __LDBL_EPSILON__ 1.08420217248550443401e-19L #define __LDBL_HAS_DENORM__ 1 #define __LDBL_HAS_INFINITY__ 1 #define __LDBL_HAS_QUIET_NAN__ 1 #define __LDBL_MANT_DIG__ 64 #define __LDBL_MAX_10_EXP__ 4932 #define __LDBL_MAX_EXP__ 16384 #define __LDBL_MAX__ 1.18973149535723176502e+4932L #define __LDBL_MIN_10_EXP__ (-4931) #define __LDBL_MIN_EXP__ (-16381) #define __LDBL_MIN__ 3.36210314311209350626e-4932L #define __LITTLE_ENDIAN__ 1 #define __LLONG_WIDTH__ 64 #define __LONG_LONG_MAX__ 9223372036854775807LL #define __LONG_MAX__ 9223372036854775807L #define __LONG_WIDTH__ 64 #define __LP64__ 1 #define __MMX__ 1 #define __NO_INLINE__ 1 #define __NO_MATH_INLINES 1 #define __OBJC_BOOL_IS_BOOL 0 #define __OBJC__ 1 #define __OPENCL_MEMORY_SCOPE_ALL_SVM_DEVICES 3 #define __OPENCL_MEMORY_SCOPE_DEVICE 2 #define __OPENCL_MEMORY_SCOPE_SUB_GROUP 4 #define __OPENCL_MEMORY_SCOPE_WORK_GROUP 1 #define __OPENCL_MEMORY_SCOPE_WORK_ITEM 0 #define __ORDER_BIG_ENDIAN__ 4321 #define __ORDER_LITTLE_ENDIAN__ 1234 #define __ORDER_PDP_ENDIAN__ 3412 #define __PIC__ 2 #define __PIE__ 2 #define __POINTER_WIDTH__ 64 #define __PRAGMA_REDEFINE_EXTNAME 1 #define __PTRDIFF_FMTd__ "ld" #define __PTRDIFF_FMTi__ "li" #define __PTRDIFF_MAX__ 9223372036854775807L #define __PTRDIFF_TYPE__ long int #define __PTRDIFF_WIDTH__ 64 #define __REGISTER_PREFIX__ #define __SCHAR_MAX__ 127 #define __SEG_FS 1 #define __SEG_GS 1 #define __SHRT_MAX__ 32767 #define __SHRT_WIDTH__ 16 #define __SIG_ATOMIC_MAX__ 2147483647 #define __SIG_ATOMIC_WIDTH__ 32 #define __SIZEOF_DOUBLE__ 8 #define __SIZEOF_FLOAT128__ 16 #define __SIZEOF_FLOAT__ 4 #define __SIZEOF_INT128__ 16 #define __SIZEOF_INT__ 4 #define __SIZEOF_LONG_DOUBLE__ 16 #define __SIZEOF_LONG_LONG__ 8 #define __SIZEOF_LONG__ 8 #define __SIZEOF_POINTER__ 8 #define __SIZEOF_PTRDIFF_T__ 8 #define __SIZEOF_SHORT__ 2 #define __SIZEOF_SIZE_T__ 8 #define __SIZEOF_WCHAR_T__ 4 #define __SIZEOF_WINT_T__ 4 #define __SIZE_FMTX__ "lX" #define __SIZE_FMTo__ "lo" #define __SIZE_FMTu__ "lu" #define __SIZE_FMTx__ "lx" #define __SIZE_MAX__ 18446744073709551615UL #define __SIZE_TYPE__ long unsigned int #define __SIZE_WIDTH__ 64 #define __SSE2_MATH__ 1 #define __SSE2__ 1 #define __SSE_MATH__ 1 #define __SSE__ 1 #define __SSP_STRONG__ 2 #define __STDC_HOSTED__ 1 #define __STDC_UTF_16__ 1 #define __STDC_UTF_32__ 1 #define __STDC_VERSION__ 201112L #define __STDC__ 1 #define __UINT16_C_SUFFIX__ #define __UINT16_FMTX__ "hX" #define __UINT16_FMTo__ "ho" #define __UINT16_FMTu__ "hu" #define __UINT16_FMTx__ "hx" #define __UINT16_MAX__ 65535 #define __UINT16_TYPE__ unsigned short #define __UINT32_C_SUFFIX__ U #define __UINT32_FMTX__ "X" #define __UINT32_FMTo__ "o" #define __UINT32_FMTu__ "u" #define __UINT32_FMTx__ "x" #define __UINT32_MAX__ 4294967295U #define __UINT32_TYPE__ unsigned int #define __UINT64_C_SUFFIX__ UL #define __UINT64_FMTX__ "lX" #define __UINT64_FMTo__ "lo" #define __UINT64_FMTu__ "lu" #define __UINT64_FMTx__ "lx" #define __UINT64_MAX__ 18446744073709551615UL #define __UINT64_TYPE__ long unsigned int #define __UINT8_C_SUFFIX__ #define __UINT8_FMTX__ "hhX" #define __UINT8_FMTo__ "hho" #define __UINT8_FMTu__ "hhu" #define __UINT8_FMTx__ "hhx" #define __UINT8_MAX__ 255 #define __UINT8_TYPE__ unsigned char #define __UINTMAX_C_SUFFIX__ UL #define __UINTMAX_FMTX__ "lX" #define __UINTMAX_FMTo__ "lo" #define __UINTMAX_FMTu__ "lu" #define __UINTMAX_FMTx__ "lx" #define __UINTMAX_MAX__ 18446744073709551615UL #define __UINTMAX_TYPE__ long unsigned int #define __UINTMAX_WIDTH__ 64 #define __UINTPTR_FMTX__ "lX" #define __UINTPTR_FMTo__ "lo" #define __UINTPTR_FMTu__ "lu" #define __UINTPTR_FMTx__ "lx" #define __UINTPTR_MAX__ 18446744073709551615UL #define __UINTPTR_TYPE__ long unsigned int #define __UINTPTR_WIDTH__ 64 #define __UINT_FAST16_FMTX__ "hX" #define __UINT_FAST16_FMTo__ "ho" #define __UINT_FAST16_FMTu__ "hu" #define __UINT_FAST16_FMTx__ "hx" #define __UINT_FAST16_MAX__ 65535 #define __UINT_FAST16_TYPE__ unsigned short #define __UINT_FAST32_FMTX__ "X" #define __UINT_FAST32_FMTo__ "o" #define __UINT_FAST32_FMTu__ "u" #define __UINT_FAST32_FMTx__ "x" #define __UINT_FAST32_MAX__ 4294967295U #define __UINT_FAST32_TYPE__ unsigned int #define __UINT_FAST64_FMTX__ "lX" #define __UINT_FAST64_FMTo__ "lo" #define __UINT_FAST64_FMTu__ "lu" #define __UINT_FAST64_FMTx__ "lx" #define __UINT_FAST64_MAX__ 18446744073709551615UL #define __UINT_FAST64_TYPE__ long unsigned int #define __UINT_FAST8_FMTX__ "hhX" #define __UINT_FAST8_FMTo__ "hho" #define __UINT_FAST8_FMTu__ "hhu" #define __UINT_FAST8_FMTx__ "hhx" #define __UINT_FAST8_MAX__ 255 #define __UINT_FAST8_TYPE__ unsigned char #define __UINT_LEAST16_FMTX__ "hX" #define __UINT_LEAST16_FMTo__ "ho" #define __UINT_LEAST16_FMTu__ "hu" #define __UINT_LEAST16_FMTx__ "hx" #define __UINT_LEAST16_MAX__ 65535 #define __UINT_LEAST16_TYPE__ unsigned short #define __UINT_LEAST32_FMTX__ "X" #define __UINT_LEAST32_FMTo__ "o" #define __UINT_LEAST32_FMTu__ "u" #define __UINT_LEAST32_FMTx__ "x" #define __UINT_LEAST32_MAX__ 4294967295U #define __UINT_LEAST32_TYPE__ unsigned int #define __UINT_LEAST64_FMTX__ "lX" #define __UINT_LEAST64_FMTo__ "lo" #define __UINT_LEAST64_FMTu__ "lu" #define __UINT_LEAST64_FMTx__ "lx" #define __UINT_LEAST64_MAX__ 18446744073709551615UL #define __UINT_LEAST64_TYPE__ long unsigned int #define __UINT_LEAST8_FMTX__ "hhX" #define __UINT_LEAST8_FMTo__ "hho" #define __UINT_LEAST8_FMTu__ "hhu" #define __UINT_LEAST8_FMTx__ "hhx" #define __UINT_LEAST8_MAX__ 255 #define __UINT_LEAST8_TYPE__ unsigned char #define __USER_LABEL_PREFIX__ #define __VERSION__ "Clang 17.0.6" #define __WCHAR_MAX__ 2147483647 #define __WCHAR_TYPE__ int #define __WCHAR_WIDTH__ 32 #define __WINT_MAX__ 4294967295U #define __WINT_TYPE__ unsigned int #define __WINT_UNSIGNED__ 1 #define __WINT_WIDTH__ 32 #define __amd64 1 #define __amd64__ 1 #define __autoreleasing __attribute__((objc_ownership(autoreleasing))) #define __clang__ 1 #define __clang_literal_encoding__ "UTF-8" #define __clang_major__ 17 #define __clang_minor__ 0 #define __clang_patchlevel__ 6 #define __clang_version__ "17.0.6 " #define __clang_wide_literal_encoding__ "UTF-32" #define __code_model_small__ 1 #define __gnu_linux__ 1 #define __k8 1 #define __k8__ 1 #define __linux 1 #define __linux__ 1 #define __llvm__ 1 #define __pic__ 2 #define __pie__ 2 #define __seg_fs __attribute__((address_space(257))) #define __seg_gs __attribute__((address_space(256))) #define __strong __attribute__((objc_ownership(strong))) #define __tune_k8__ 1 #define __unix 1 #define __unix__ 1 #define __unsafe_unretained __attribute__((objc_ownership(none))) #define __weak __attribute__((objc_ownership(weak))) #define __x86_64 1 #define __x86_64__ 1 #define linux 1 #define unix 1 1 error generated. ```

no mention of __APPLE__ anywhere with this test.

[NSExceptional]

Can you try using #ifdef linux or with __linux__?