Annex D (normative) Compatibility features [depr]

D.11 Deprecated C macros [depr.c.macros]

1
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The header <cfloat> has the following macros: #define FLT_HAS_SUBNORM see below #define DBL_HAS_SUBNORM see below #define LDBL_HAS_SUBNORM see below #define DECIMAL_DIG see below
The header defines these macros the same as the C standard library header <float.h>.
See also: ISO/IEC 9899:2024, 5.2.4.2.2, 7.33.5
2
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In addition to being available via inclusion of the <cfloat> header, the macros INFINITY and NAN are available when <cmath> is included.
See also: ISO/IEC 9899:2024, 7.12
3
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The header <stdbool.h> has the following macro: #define __bool_true_false_are_defined 1
See also: ISO/IEC 9899:2024, 7.19