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#define CONCAT(a, b) a##b
#define CONCAT2(a, b) CONCAT(a, b)
#define STATIC_ASSERT(condition) \
int CONCAT2(some_array, __LINE__)[(condition) ? 1 : -1]
// hex-based constants
STATIC_ASSERT(0x1.0p-95f == 2.524355e-29f);
// also with upper case X, P, F
STATIC_ASSERT(0X1.0P-95F == 2.524355e-29f);
// nothing before the dot
STATIC_ASSERT(0X.0p+1f == 0);
// 32-bit, 64-bit and 128-bit constants, GCC proper only,
// clang doesn't have it
#if defined(__GNUC__) && !defined(__clang__) && __GNUC__ >= 7
STATIC_ASSERT(__builtin_types_compatible_p(_Float32, __typeof(1.0f32)));
STATIC_ASSERT(__builtin_types_compatible_p(_Float64, __typeof(1.0f64)));
STATIC_ASSERT(__builtin_types_compatible_p(_Float128, __typeof(1.0f128)));
STATIC_ASSERT(__builtin_types_compatible_p(_Float32x, __typeof(1.0f32x)));
STATIC_ASSERT(__builtin_types_compatible_p(_Float64x, __typeof(1.0f64x)));
// f128x should be supported by GCC >= 7 (and for C++ in GCC >=13), but there
// are no current GCC target architectures that actually support such types
STATIC_ASSERT(__builtin_types_compatible_p(_Float128x, __typeof(1.0f128x)));
#endif
#if defined(__GNUC__) && !defined(__clang__) && __GNUC__ >= 13
STATIC_ASSERT(__builtin_types_compatible_p(_Float16, __typeof(1.0f16)));
STATIC_ASSERT(__builtin_types_compatible_p(__bf16, __typeof(1.0bf16)));
STATIC_ASSERT(__builtin_types_compatible_p(__bf16, __typeof(1.BF16)));
#endif
#if defined(__clang__) && __clang_major__ >= 15
STATIC_ASSERT(__builtin_types_compatible_p(_Float16, __typeof(1.0f16)));
#endif
#ifdef __GNUC__
_Complex c;
#endif
int main()
{
// imaginary constants, these are GCC only
#ifdef __GNUC__
c=(__extension__ 1.0iF);
c=(__extension__ 1.0Fi);
c=(__extension__ 1.0jF);
c=(__extension__ 1.0j);
c=(__extension__ 1.0jL);
c=(__extension__ 1.0il);
#endif
}
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