1 // RUN: %clang_cc1 -verify -std=c99 -ffreestanding %s 2 // RUN: %clang_cc1 -verify -std=gnu89 -ffreestanding %s 3 // RUN: %clang_cc1 -verify -std=c89 -ffreestanding %s 4 // expected-no-diagnostics 5 6 /* WG14 ???: Clang 16 7 * Additional floating-point characteristics in <float.h> 8 * 9 * NB: the original paper number is unknown, this was gleaned from the editor's 10 * report in the C99 foreword. There were two new additions to <float.h> in 11 * C99, this is testing that we support both of them. 12 * 13 * Clang added the macros at least as far back as Clang 3.0, but it wasn't 14 * until Clang 16.0 that we stopped accidentally providing FLT_EVAL_METHOD in 15 * C89 (strict) mode. 16 */ 17 18 #include <float.h> 19 20 // We expect all the definitions in C99 mode. 21 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L 22 #define EXPECT_DECIMAL_DIG 23 #define EXPECT_FLT_EVAL_METHOD 24 #endif 25 26 // If we're not in C99 mode, we still expect the definition of DECIMAL_DIG 27 // unless we're in strict ansi mode. 28 #if !defined(EXPECT_DECIMAL_DIG) && !defined(__STRICT_ANSI__) 29 #define EXPECT_DECIMAL_DIG 30 #endif 31 32 #if defined(EXPECT_DECIMAL_DIG) 33 #if !defined(DECIMAL_DIG) 34 #error "DECIMAL_DIG missing" 35 #endif 36 #else 37 #if defined(DECIMAL_DIG) 38 #error "DECIMAL_DIG provided when not expected" 39 #endif 40 #endif 41 42 #if defined(EXPECT_FLT_EVAL_METHOD) 43 #if !defined(FLT_EVAL_METHOD) 44 #error "FLT_EVAL_METHOD missing" 45 #endif 46 #else 47 #if defined(FLT_EVAL_METHOD) 48 #error "FLT_EVAL_METHOD provided when not expected" 49 #endif 50 #endif 51