Halide headers fail to compile for wasm32-wasip1 due to incorrect _Float16 detection

[hpcnt-daniel-l]

Summary

When using the Halide headers with a Clang toolchain targeting wasm32-wasip1, compilation fails because Halide's feature detection incorrectly assumes _Float16 support is available.

Minimal Reproducible Example

test.cpp

#include <Halide.h>
int main() { return 0; }

Compilation Command:

clang++ --target=wasm32-wasip1 -std=c++17 \
  -I/path/to/Halide-21.0.0-arm-64-osx/include \
  -c test.cpp -o test.o

Actual Result

The compiler fails with the following error:

/path/to/Halide-21.0.0-arm-64-osx/include/HalideRuntime.h:2156:61: error:
      _Float16 is not supported on this target
 2156 | HALIDE_ALWAYS_INLINE constexpr halide_type_t halide_type_of<_Float16>() {
      |                                                          ^

Expected Result

The headers should compile successfully. If the target (WASM) does not support _Float16, Halide should automatically disable the corresponding halide_type_of helpers.

Analysis / Workaround

• In src/runtime/HalideRuntime.h, Halide enables HALIDE_CPP_COMPILER_HAS_FLOAT16 for clang using the __is_identifier(_Float16) check, but it seems this is not enough to ensure that _Float16 is actually supported on the target.
• For wasm32-wasip1, that detection appears to succeed even though clang later rejects actual _Float16 usage on that target.
• Emscripten does not hit this because Halide already excludes __EMSCRIPTEN__ in that detection path.
• I can work around this by defining HALIDE_RUNTIME_ASAN_DETECTED to disable _Float16 support, but this is not ideal since that flag is not intended for this purpose.

Suggested Fixes

1. Add && !defined(__wasm__) to the clang _Float16 auto-detection path.
2. Add a dedicated opt-out macro such as HALIDE_DISABLE_CPP_FLOAT16, rather than requiring users to define HALIDE_RUNTIME_ASAN_DETECTED for this purpose.

Environment

• Halide Version: 21.0.0
• Compiler: Homebrew Clang 21.1.8
• OS: macOS 26.3

[alexreinking]

On your toolchain, can you please run clang++ --target=wasm32-wasip1 -std=c++17 -dM -E -xc++ - < /dev/null?

[bc-lee]

Folded

$ /opt/homebrew/Cellar/llvm@21/21.1.8/bin/clang++ --target=wasm32-wasip1 -std=c++17 -dM -E -xc++ - < /dev/null
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#define __cpp_variadic_friend 202403L
#define __cpp_variadic_templates 200704L
#define __cpp_variadic_using 201611L
#define __llvm__ 1
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#define __wasi__ 1
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#define __wasm__ 1
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#define __wasm_sign_ext__ 1

Note that I am the same person as the original poster, just using a different GitHub account. Ideally, I should use this account for all FOSS communications, but I sometimes make mistakes :(

[alexreinking]

To get yourself immediately unstuck, try passing -mfp16 at the Clang command line.

An appropriate patch for Halide would be to check the __wasm_fp16__ preprocessor define:

(halide) areinking@Mac llvm-project % /opt/homebrew/opt/llvm@21/bin/clang++ --target=wasm32-wasip1 -mfp16 -std=c++17 -dM -E -xc++ - < /dev/null | grep fp16
#define __wasm_fp16__ 1

[bc-lee]

It still does not work with -mfp16.

$ /opt/homebrew/Cellar/llvm@21/21.1.8/bin/clang --target=wasm32-wasip1 -mfp16 -std=c++17 -I/path/to/Halide-21.0.0-arm-64-osx/include -c test.cc -o a.out
In file included from test.cc:1:
/path/to/Halide-21.0.0-arm-64-osx/include/HalideRuntime.h:2156:61: error: _Float16 is
      not supported on this target
 2156 | HALIDE_ALWAYS_INLINE constexpr halide_type_t halide_type_of<_Float16>() {
      |                                                             ^
1 error generated.

Also, I don’t think it is correct to pass -mfp16 for a WASM target. As far as I understand, current WebAssembly runtimes do not support float16, so enabling -mfp16 here does not seem appropriate.

[alexreinking]

Clearly, the -mfp16 flag has an effect on the wasm32 backend -- otherwise it wouldn't define __wasm_fp16__. Let me look into which conditions enable support for the _Float16 type.

[alexreinking]

Okay, that's narrowly referring to the __fp16 storage type. Yes, the correct thing to do is:

1. Check that __wasm__ is not defined
2. Rework HALIDE_CPP_COMPILER_HAS_FLOAT16 so that it's defined as either 1 or 0, and detection is skipped if it's already defined. That way we don't need an extra suppression symbol.

[bc-lee]

Note that the Emscripten SDK’s compiler also defines __wasm__, so we can simplify the condition accordingly.

Folded

$ /path/to/emsdk/upstream/emscripten/em++ -dM -E -xc++ - < /dev/null
#define EMSCRIPTEN 1
#define _GNU_SOURCE 1
#define _ILP32 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__ 128
#define __BOOL_WIDTH__ 1
#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 __DBL_NORM_MAX__ 1.7976931348623157e+308
#define __DECIMAL_DIG__ __LDBL_DECIMAL_DIG__
#define __DEPRECATED 1
#define __EMSCRIPTEN__ 1
#define __EXCEPTIONS 1
#define __FINITE_MATH_ONLY__ 0
#define __FLOAT128__ 1
#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_NORM_MAX__ 3.40282347e+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 __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_CONSTRUCTIVE_SIZE 64
#define __GCC_DESTRUCTIVE_SIZE 64
#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 __GLIBCXX_BITSIZE_INT_N_0 128
#define __GLIBCXX_TYPE_INT_N_0 __int128
#define __GNUC_GNU_INLINE__ 1
#define __GNUC_MINOR__ 2
#define __GNUC_PATCHLEVEL__ 1
#define __GNUC__ 4
#define __GNUG__ 4
#define __GXX_ABI_VERSION 1002
#define __GXX_EXPERIMENTAL_CXX0X__ 1
#define __GXX_RTTI 1
#define __GXX_WEAK__ 1
#define __ILP32__ 1
#define __INT16_C(c) c
#define __INT16_C_SUFFIX__
#define __INT16_FMTd__ "hd"
#define __INT16_FMTi__ "hi"
#define __INT16_MAX__ 32767
#define __INT16_TYPE__ short
#define __INT32_C(c) c
#define __INT32_C_SUFFIX__
#define __INT32_FMTd__ "d"
#define __INT32_FMTi__ "i"
#define __INT32_MAX__ 2147483647
#define __INT32_TYPE__ int
#define __INT64_C(c) c##LL
#define __INT64_C_SUFFIX__ LL
#define __INT64_FMTd__ "lld"
#define __INT64_FMTi__ "lli"
#define __INT64_MAX__ 9223372036854775807LL
#define __INT64_TYPE__ long long int
#define __INT8_C(c) c
#define __INT8_C_SUFFIX__
#define __INT8_FMTd__ "hhd"
#define __INT8_FMTi__ "hhi"
#define __INT8_MAX__ 127
#define __INT8_TYPE__ signed char
#define __INTMAX_C(c) c##LL
#define __INTMAX_C_SUFFIX__ LL
#define __INTMAX_FMTd__ "lld"
#define __INTMAX_FMTi__ "lli"
#define __INTMAX_MAX__ 9223372036854775807LL
#define __INTMAX_TYPE__ long long int
#define __INTMAX_WIDTH__ 64
#define __INTPTR_FMTd__ "ld"
#define __INTPTR_FMTi__ "li"
#define __INTPTR_MAX__ 2147483647L
#define __INTPTR_TYPE__ long int
#define __INTPTR_WIDTH__ 32
#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__ "lld"
#define __INT_FAST64_FMTi__ "lli"
#define __INT_FAST64_MAX__ 9223372036854775807LL
#define __INT_FAST64_TYPE__ long 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__ "lld"
#define __INT_LEAST64_FMTi__ "lli"
#define __INT_LEAST64_MAX__ 9223372036854775807LL
#define __INT_LEAST64_TYPE__ long 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__ 36
#define __LDBL_DENORM_MIN__ 6.47517511943802511092443895822764655e-4966L
#define __LDBL_DIG__ 33
#define __LDBL_EPSILON__ 1.92592994438723585305597794258492732e-34L
#define __LDBL_HAS_DENORM__ 1
#define __LDBL_HAS_INFINITY__ 1
#define __LDBL_HAS_QUIET_NAN__ 1
#define __LDBL_MANT_DIG__ 113
#define __LDBL_MAX_10_EXP__ 4932
#define __LDBL_MAX_EXP__ 16384
#define __LDBL_MAX__ 1.18973149535723176508575932662800702e+4932L
#define __LDBL_MIN_10_EXP__ (-4931)
#define __LDBL_MIN_EXP__ (-16381)
#define __LDBL_MIN__ 3.36210314311209350626267781732175260e-4932L
#define __LDBL_NORM_MAX__ 1.18973149535723176508575932662800702e+4932L
#define __LITTLE_ENDIAN__ 1
#define __LLONG_WIDTH__ 64
#define __LONG_LONG_MAX__ 9223372036854775807LL
#define __LONG_MAX__ 2147483647L
#define __LONG_WIDTH__ 32
#define __MEMORY_SCOPE_CLUSTR 5
#define __MEMORY_SCOPE_DEVICE 1
#define __MEMORY_SCOPE_SINGLE 4
#define __MEMORY_SCOPE_SYSTEM 0
#define __MEMORY_SCOPE_WRKGRP 2
#define __MEMORY_SCOPE_WVFRNT 3
#define __NO_INLINE__ 1
#define __NO_MATH_ERRNO__ 1
#define __OBJC_BOOL_IS_BOOL 0
#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 __POINTER_WIDTH__ 32
#define __PRAGMA_REDEFINE_EXTNAME 1
#define __PTRDIFF_FMTd__ "ld"
#define __PTRDIFF_FMTi__ "li"
#define __PTRDIFF_MAX__ 2147483647L
#define __PTRDIFF_TYPE__ long int
#define __PTRDIFF_WIDTH__ 32
#define __SCHAR_MAX__ 127
#define __SHRT_MAX__ 32767
#define __SHRT_WIDTH__ 16
#define __SIG_ATOMIC_MAX__ 2147483647L
#define __SIG_ATOMIC_WIDTH__ 32
#define __SIZEOF_DOUBLE__ 8
#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__ 4
#define __SIZEOF_POINTER__ 4
#define __SIZEOF_PTRDIFF_T__ 4
#define __SIZEOF_SHORT__ 2
#define __SIZEOF_SIZE_T__ 4
#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__ 4294967295UL
#define __SIZE_TYPE__ long unsigned int
#define __SIZE_WIDTH__ 32
#define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 8UL
#define __STDC_EMBED_EMPTY__ 2
#define __STDC_EMBED_FOUND__ 1
#define __STDC_EMBED_NOT_FOUND__ 0
#define __STDC_HOSTED__ 1
#define __STDC_UTF_16__ 1
#define __STDC_UTF_32__ 1
#define __STDC__ 1
#define __UINT16_C(c) c
#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(c) c##U
#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(c) c##ULL
#define __UINT64_C_SUFFIX__ ULL
#define __UINT64_FMTX__ "llX"
#define __UINT64_FMTo__ "llo"
#define __UINT64_FMTu__ "llu"
#define __UINT64_FMTx__ "llx"
#define __UINT64_MAX__ 18446744073709551615ULL
#define __UINT64_TYPE__ long long unsigned int
#define __UINT8_C(c) c
#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(c) c##ULL
#define __UINTMAX_C_SUFFIX__ ULL
#define __UINTMAX_FMTX__ "llX"
#define __UINTMAX_FMTo__ "llo"
#define __UINTMAX_FMTu__ "llu"
#define __UINTMAX_FMTx__ "llx"
#define __UINTMAX_MAX__ 18446744073709551615ULL
#define __UINTMAX_TYPE__ long 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__ 4294967295UL
#define __UINTPTR_TYPE__ long unsigned int
#define __UINTPTR_WIDTH__ 32
#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__ "llX"
#define __UINT_FAST64_FMTo__ "llo"
#define __UINT_FAST64_FMTu__ "llu"
#define __UINT_FAST64_FMTx__ "llx"
#define __UINT_FAST64_MAX__ 18446744073709551615ULL
#define __UINT_FAST64_TYPE__ long 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__ "llX"
#define __UINT_LEAST64_FMTo__ "llo"
#define __UINT_LEAST64_FMTu__ "llu"
#define __UINT_LEAST64_FMTx__ "llx"
#define __UINT_LEAST64_MAX__ 18446744073709551615ULL
#define __UINT_LEAST64_TYPE__ long 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 23.0.0git (https:/github.com/llvm/llvm-project 58f4da463e5b3cd3531cace17cc3f2d8d860964e)"
#define __WCHAR_MAX__ 2147483647
#define __WCHAR_TYPE__ int
#define __WCHAR_WIDTH__ 32
#define __WINT_MAX__ 2147483647
#define __WINT_TYPE__ int
#define __WINT_WIDTH__ 32
#define __clang__ 1
#define __clang_literal_encoding__ "UTF-8"
#define __clang_major__ 23
#define __clang_minor__ 0
#define __clang_patchlevel__ 0
#define __clang_version__ "23.0.0git (https:/github.com/llvm/llvm-project 58f4da463e5b3cd3531cace17cc3f2d8d860964e)"
#define __clang_wide_literal_encoding__ "UTF-32"
#define __cplusplus 201703L
#define __cpp_aggregate_bases 201603L
#define __cpp_aggregate_nsdmi 201304L
#define __cpp_alias_templates 200704L
#define __cpp_aligned_new 201606L
#define __cpp_attributes 200809L
#define __cpp_binary_literals 201304L
#define __cpp_capture_star_this 201603L
#define __cpp_constexpr 201603L
#define __cpp_constexpr_in_decltype 201711L
#define __cpp_decltype 200707L
#define __cpp_decltype_auto 201304L
#define __cpp_deduction_guides 201703L
#define __cpp_delegating_constructors 200604L
#define __cpp_deleted_function 202403L
#define __cpp_digit_separators 201309L
#define __cpp_enumerator_attributes 201411L
#define __cpp_exceptions 199711L
#define __cpp_fold_expressions 201603L
#define __cpp_generic_lambdas 201304L
#define __cpp_guaranteed_copy_elision 201606L
#define __cpp_hex_float 201603L
#define __cpp_if_constexpr 201606L
#define __cpp_impl_destroying_delete 201806L
#define __cpp_inheriting_constructors 201511L
#define __cpp_init_captures 201304L
#define __cpp_initializer_lists 200806L
#define __cpp_inline_variables 201606L
#define __cpp_lambdas 200907L
#define __cpp_named_character_escapes 202207L
#define __cpp_namespace_attributes 201411L
#define __cpp_nested_namespace_definitions 201411L
#define __cpp_noexcept_function_type 201510L
#define __cpp_nontype_template_args 201411L
#define __cpp_nontype_template_parameter_auto 201606L
#define __cpp_nsdmi 200809L
#define __cpp_pack_indexing 202311L
#define __cpp_placeholder_variables 202306L
#define __cpp_range_based_for 201603L
#define __cpp_raw_strings 200710L
#define __cpp_ref_qualifiers 200710L
#define __cpp_return_type_deduction 201304L
#define __cpp_rtti 199711L
#define __cpp_rvalue_references 200610L
#define __cpp_sized_deallocation 201309L
#define __cpp_static_assert 202306L
#define __cpp_static_call_operator 202207L
#define __cpp_structured_bindings 202411L
#define __cpp_template_auto 201606L
#define __cpp_template_template_args 201611L
#define __cpp_trivial_relocatability 202502L
#define __cpp_unicode_characters 200704L
#define __cpp_unicode_literals 200710L
#define __cpp_user_defined_literals 200809L
#define __cpp_variable_templates 201304L
#define __cpp_variadic_friend 202403L
#define __cpp_variadic_templates 200704L
#define __cpp_variadic_using 201611L
#define __llvm__ 1
#define __private_extern__ extern
#define __unix 1
#define __unix__ 1
#define __wasm 1
#define __wasm32 1
#define __wasm32__ 1
#define __wasm__ 1
#define __wasm_bulk_memory__ 1
#define __wasm_bulk_memory_opt__ 1
#define __wasm_multivalue__ 1
#define __wasm_mutable_globals__ 1
#define __wasm_nontrapping_fptoint__ 1
#define __wasm_reference_types__ 1
#define __wasm_sign_ext__ 1
#define unix 1