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llvm/clang/test/Preprocessor/init-v7k-compat.c
Manuel Sainz de Baranda y Goñi 33ad474c45 [Clang] Add predefined macros for integer constants (#123514) 
This adds predefined macros for integer constants to implement section 7.18.4 of ISO/IEC 9899:1999 in `<stdint.h>` in a safe way:

```
__INT8_C(c)
__INT16_C(c)
__INT32_C(c)
__INT64_C(c)
__INTMAX_C(c)
__UINT8_C(c)
__UINT16_C(c)
__UINT32_C(c)
__UINT64_C(c)
__UINTMAX_C(c)
```

Which improves compatibility with GCC and makes it trivial to implement
section 7.18.4 of ISO/IEC 9899:1999.

Clang defines `__INT<N>_C_SUFFIX__`, `__UINT<N>_C_SUFFIX__`,
`__INTAX_C_SUFFIX__` and `__UINTMAX_C_SUFFIX__`, but these macros are
useless for this purpose.

Let's say, for example, that `__INT64_C_SUFFIX__` expands to `L` or
`LL`. If the user defines them as a macros, the compiler will produce
errors if `INT64_C` is implemented in `<stdint.h>` using
`__INT64_C_SUFFIX__`:

**minimal-test.c:**
```cpp
#if defined(__clang__) & !defined(__INT64_C)
#	pragma clang diagnostic push
#	pragma clang diagnostic ignored "-Wreserved-identifier"
#	define __PSTDC_INT_C_(literal, suffix) literal##suffix
#	define __PSTDC_INT_C(literal, suffix) __PSTDC_INT_C_(literal, suffix)
#	define INT64_C(literal) __PSTDC_INT_C(literal, __INT64_C_SUFFIX__)
#	pragma clang diagnostic pop
#elif defined(__GNUC__)
#	define INT64_C __INT64_C
#endif

typedef __INT64_TYPE__ int64_t;

#define L  "Make Clang produce an error"
#define LL "Make Clang produce an error"

int main(int argc, char **argv)
	{
	(void)argc; (void)argv;
	int64_t v = INT64_C(9223372036854775807);
	(void)v;
	return 0;
	}

```

<img width="697" alt="imagen"
src="https://github.com/user-attachments/assets/6df97af6-7cfd-4cf9-85b7-d7c854509325"
/>

**test.c:**
```cpp
#if defined(__clang__) && !defined(__INT8_C)
#	pragma clang diagnostic push
#	pragma clang diagnostic ignored "-Wreserved-identifier"

#	define __PSTDC_INT_C_(literal, suffix) literal##suffix
#	define __PSTDC_INT_C(literal, suffix) __PSTDC_INT_C_(literal, suffix)

#	define INT8_C(literal)    __PSTDC_INT_C(literal, __INT8_C_SUFFIX__)
#	define INT16_C(literal)   __PSTDC_INT_C(literal, __INT16_C_SUFFIX__)
#	define INT32_C(literal)   __PSTDC_INT_C(literal, __INT32_C_SUFFIX__)
#	define INT64_C(literal)   __PSTDC_INT_C(literal, __INT64_C_SUFFIX__)
#	define INTMAX_C(literal)  __PSTDC_INT_C(literal, __INTMAX_C_SUFFIX__)
#	define UINT8_C(literal)   __PSTDC_INT_C(literal, __UINT8_C_SUFFIX__)
#	define UINT16_C(literal)  __PSTDC_INT_C(literal, __UINT16_C_SUFFIX__)
#	define UINT32_C(literal)  __PSTDC_INT_C(literal, __UINT32_C_SUFFIX__)
#	define UINT64_C(literal)  __PSTDC_INT_C(literal, __UINT64_C_SUFFIX__)
#	define UINTMAX_C(literal) __PSTDC_INT_C(literal, __UINTMAX_C_SUFFIX__)

#	pragma clang diagnostic pop

#else
#	define INT8_C    __INT8_C
#	define INT16_C   __INT16_C
#	define INT32_C   __INT32_C
#	define INT64_C   __INT64_C
#	define INTMAX_C  __INTMAX_C
#	define UINT8_C   __UINT8_C
#	define UINT16_C  __UINT16_C
#	define UINT32_C  __UINT32_C
#	define UINT64_C  __UINT64_C
#	define UINTMAX_C __UINTMAX_C
#endif

typedef __INT8_TYPE__    int8_t;
typedef __INT16_TYPE__   int16_t;
typedef __INT32_TYPE__   int32_t;
typedef __INT64_TYPE__   int64_t;
typedef __INTMAX_TYPE__  intmax_t;
typedef __UINT8_TYPE__   uint8_t;
typedef __UINT16_TYPE__  uint16_t;
typedef __UINT32_TYPE__  uint32_t;
typedef __UINT64_TYPE__  uint64_t;
typedef __UINTMAX_TYPE__ uintmax_t;

#define L   "Make Clang produce an error"
#define LL  "Make Clang produce an error"
#define U   "Make Clang produce an error"
#define UL  "Make Clang produce an error"
#define ULL "Make Clang produce an error"

int main(int argc, char **argv)
	{
	(void)argc; (void)argv;

	int8_t    a = INT8_C   (127);
	int16_t   b = INT16_C  (32767);
	int32_t   c = INT32_C  (2147483647);
	int64_t   d = INT64_C  (9223372036854775807);
	intmax_t  e = INTMAX_C (9223372036854775807);
	uint8_t   f = UINT8_C  (255);
	uint16_t  g = UINT16_C (65535);
	uint32_t  h = UINT32_C (4294967295);
	uint64_t  i = UINT64_C (18446744073709551615);
	uintmax_t j = UINTMAX_C(18446744073709551615);

	(void)a; (void)b; (void)c; (void)d; (void)e;
	(void)f; (void)g; (void)h; (void)i; (void)j;
	return 0;
	}
```
2025-01-26 16:48:42 +01:00

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// RUN: %clang_cc1 -E -dM -ffreestanding -triple=arm64_32-apple-ios7.0 < /dev/null | FileCheck %s
// RUN: %clang_cc1 -E -dM -ffreestanding -triple=thumbv7k-apple-watchos2.0 < /dev/null | FileCheck %s
// Check that the chosen types for things like size_t, ptrdiff_t etc are as
// expected
// CHECK-NOT: #define _LP64 1
// CHECK-NOT: #define __AARCH_BIG_ENDIAN 1
// CHECK-NOT: #define __ARM_BIG_ENDIAN 1
// CHECK: #define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
// CHECK: #define __CHAR16_TYPE__ unsigned short
// CHECK: #define __CHAR32_TYPE__ unsigned int
// CHECK: #define __CHAR_BIT__ 8
// CHECK: #define __DBL_DENORM_MIN__ 4.9406564584124654e-324
// CHECK: #define __DBL_DIG__ 15
// CHECK: #define __DBL_EPSILON__ 2.2204460492503131e-16
// CHECK: #define __DBL_HAS_DENORM__ 1
// CHECK: #define __DBL_HAS_INFINITY__ 1
// CHECK: #define __DBL_HAS_QUIET_NAN__ 1
// CHECK: #define __DBL_MANT_DIG__ 53
// CHECK: #define __DBL_MAX_10_EXP__ 308
// CHECK: #define __DBL_MAX_EXP__ 1024
// CHECK: #define __DBL_MAX__ 1.7976931348623157e+308
// CHECK: #define __DBL_MIN_10_EXP__ (-307)
// CHECK: #define __DBL_MIN_EXP__ (-1021)
// CHECK: #define __DBL_MIN__ 2.2250738585072014e-308
// CHECK: #define __DECIMAL_DIG__ __LDBL_DECIMAL_DIG__
// CHECK: #define __FLT_DENORM_MIN__ 1.40129846e-45F
// CHECK: #define __FLT_DIG__ 6
// CHECK: #define __FLT_EPSILON__ 1.19209290e-7F
// CHECK: #define __FLT_HAS_DENORM__ 1
// CHECK: #define __FLT_HAS_INFINITY__ 1
// CHECK: #define __FLT_HAS_QUIET_NAN__ 1
// CHECK: #define __FLT_MANT_DIG__ 24
// CHECK: #define __FLT_MAX_10_EXP__ 38
// CHECK: #define __FLT_MAX_EXP__ 128
// CHECK: #define __FLT_MAX__ 3.40282347e+38F
// CHECK: #define __FLT_MIN_10_EXP__ (-37)
// CHECK: #define __FLT_MIN_EXP__ (-125)
// CHECK: #define __FLT_MIN__ 1.17549435e-38F
// CHECK: #define __FLT_RADIX__ 2
// CHECK: #define __INT16_C(c) c
// CHECK: #define __INT16_C_SUFFIX__ {{$}}
// CHECK: #define __INT16_FMTd__ "hd"
// CHECK: #define __INT16_FMTi__ "hi"
// CHECK: #define __INT16_MAX__ 32767
// CHECK: #define __INT16_TYPE__ short
// CHECK: #define __INT32_C(c) c
// CHECK: #define __INT32_C_SUFFIX__ {{$}}
// CHECK: #define __INT32_FMTd__ "d"
// CHECK: #define __INT32_FMTi__ "i"
// CHECK: #define __INT32_MAX__ 2147483647
// CHECK: #define __INT32_TYPE__ int
// CHECK: #define __INT64_C(c) c##LL
// CHECK: #define __INT64_C_SUFFIX__ LL
// CHECK: #define __INT64_FMTd__ "lld"
// CHECK: #define __INT64_FMTi__ "lli"
// CHECK: #define __INT64_MAX__ 9223372036854775807LL
// CHECK: #define __INT64_TYPE__ long long int
// CHECK: #define __INT8_C(c) c
// CHECK: #define __INT8_C_SUFFIX__ {{$}}
// CHECK: #define __INT8_FMTd__ "hhd"
// CHECK: #define __INT8_FMTi__ "hhi"
// CHECK: #define __INT8_MAX__ 127
// CHECK: #define __INT8_TYPE__ signed char
// CHECK: #define __INTMAX_C(c) c##LL
// CHECK: #define __INTMAX_C_SUFFIX__ LL
// CHECK: #define __INTMAX_FMTd__ "lld"
// CHECK: #define __INTMAX_FMTi__ "lli"
// CHECK: #define __INTMAX_MAX__ 9223372036854775807LL
// CHECK: #define __INTMAX_TYPE__ long long int
// CHECK: #define __INTMAX_WIDTH__ 64
// CHECK: #define __INTPTR_FMTd__ "ld"
// CHECK: #define __INTPTR_FMTi__ "li"
// CHECK: #define __INTPTR_MAX__ 2147483647L
// CHECK: #define __INTPTR_TYPE__ long int
// CHECK: #define __INTPTR_WIDTH__ 32
// CHECK: #define __INT_FAST16_FMTd__ "hd"
// CHECK: #define __INT_FAST16_FMTi__ "hi"
// CHECK: #define __INT_FAST16_MAX__ 32767
// CHECK: #define __INT_FAST16_TYPE__ short
// CHECK: #define __INT_FAST32_FMTd__ "d"
// CHECK: #define __INT_FAST32_FMTi__ "i"
// CHECK: #define __INT_FAST32_MAX__ 2147483647
// CHECK: #define __INT_FAST32_TYPE__ int
// CHECK: #define __INT_FAST64_FMTd__ "lld"
// CHECK: #define __INT_FAST64_FMTi__ "lli"
// CHECK: #define __INT_FAST64_MAX__ 9223372036854775807LL
// CHECK: #define __INT_FAST64_TYPE__ long long int
// CHECK: #define __INT_FAST8_FMTd__ "hhd"
// CHECK: #define __INT_FAST8_FMTi__ "hhi"
// CHECK: #define __INT_FAST8_MAX__ 127
// CHECK: #define __INT_FAST8_TYPE__ signed char
// CHECK: #define __INT_LEAST16_FMTd__ "hd"
// CHECK: #define __INT_LEAST16_FMTi__ "hi"
// CHECK: #define __INT_LEAST16_MAX__ 32767
// CHECK: #define __INT_LEAST16_TYPE__ short
// CHECK: #define __INT_LEAST32_FMTd__ "d"
// CHECK: #define __INT_LEAST32_FMTi__ "i"
// CHECK: #define __INT_LEAST32_MAX__ 2147483647
// CHECK: #define __INT_LEAST32_TYPE__ int
// CHECK: #define __INT_LEAST64_FMTd__ "lld"
// CHECK: #define __INT_LEAST64_FMTi__ "lli"
// CHECK: #define __INT_LEAST64_MAX__ 9223372036854775807LL
// CHECK: #define __INT_LEAST64_TYPE__ long long int
// CHECK: #define __INT_LEAST8_FMTd__ "hhd"
// CHECK: #define __INT_LEAST8_FMTi__ "hhi"
// CHECK: #define __INT_LEAST8_MAX__ 127
// CHECK: #define __INT_LEAST8_TYPE__ signed char
// CHECK: #define __INT_MAX__ 2147483647
// CHECK: #define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L
// CHECK: #define __LDBL_DIG__ 15
// CHECK: #define __LDBL_EPSILON__ 2.2204460492503131e-16L
// CHECK: #define __LDBL_HAS_DENORM__ 1
// CHECK: #define __LDBL_HAS_INFINITY__ 1
// CHECK: #define __LDBL_HAS_QUIET_NAN__ 1
// CHECK: #define __LDBL_MANT_DIG__ 53
// CHECK: #define __LDBL_MAX_10_EXP__ 308
// CHECK: #define __LDBL_MAX_EXP__ 1024
// CHECK: #define __LDBL_MAX__ 1.7976931348623157e+308L
// CHECK: #define __LDBL_MIN_10_EXP__ (-307)
// CHECK: #define __LDBL_MIN_EXP__ (-1021)
// CHECK: #define __LDBL_MIN__ 2.2250738585072014e-308L
// CHECK: #define __LONG_LONG_MAX__ 9223372036854775807LL
// CHECK: #define __LONG_MAX__ 2147483647L
// CHECK: #define __POINTER_WIDTH__ 32
// CHECK: #define __PTRDIFF_TYPE__ long int
// CHECK: #define __PTRDIFF_WIDTH__ 32
// CHECK: #define __SCHAR_MAX__ 127
// CHECK: #define __SHRT_MAX__ 32767
// CHECK: #define __SIG_ATOMIC_MAX__ 2147483647
// CHECK: #define __SIG_ATOMIC_WIDTH__ 32
// CHECK: #define __SIZEOF_DOUBLE__ 8
// CHECK: #define __SIZEOF_FLOAT__ 4
// CHECK: #define __SIZEOF_INT__ 4
// CHECK: #define __SIZEOF_LONG_DOUBLE__ 8
// CHECK: #define __SIZEOF_LONG_LONG__ 8
// CHECK: #define __SIZEOF_LONG__ 4
// CHECK: #define __SIZEOF_POINTER__ 4
// CHECK: #define __SIZEOF_PTRDIFF_T__ 4
// CHECK: #define __SIZEOF_SHORT__ 2
// CHECK: #define __SIZEOF_SIZE_T__ 4
// CHECK: #define __SIZEOF_WCHAR_T__ 4
// CHECK: #define __SIZEOF_WINT_T__ 4
// CHECK: #define __SIZE_MAX__ 4294967295UL
// CHECK: #define __SIZE_TYPE__ long unsigned int
// CHECK: #define __SIZE_WIDTH__ 32
// CHECK: #define __UINT16_C(c) c
// CHECK: #define __UINT16_C_SUFFIX__ {{$}}
// CHECK: #define __UINT16_MAX__ 65535
// CHECK: #define __UINT16_TYPE__ unsigned short
// CHECK: #define __UINT32_C(c) c##U
// CHECK: #define __UINT32_C_SUFFIX__ U
// CHECK: #define __UINT32_MAX__ 4294967295U
// CHECK: #define __UINT32_TYPE__ unsigned int
// CHECK: #define __UINT64_C(c) c##ULL
// CHECK: #define __UINT64_C_SUFFIX__ ULL
// CHECK: #define __UINT64_MAX__ 18446744073709551615ULL
// CHECK: #define __UINT64_TYPE__ long long unsigned int
// CHECK: #define __UINT8_C(c) c
// CHECK: #define __UINT8_C_SUFFIX__ {{$}}
// CHECK: #define __UINT8_MAX__ 255
// CHECK: #define __UINT8_TYPE__ unsigned char
// CHECK: #define __UINTMAX_C(c) c##ULL
// CHECK: #define __UINTMAX_C_SUFFIX__ ULL
// CHECK: #define __UINTMAX_MAX__ 18446744073709551615ULL
// CHECK: #define __UINTMAX_TYPE__ long long unsigned int
// CHECK: #define __UINTMAX_WIDTH__ 64
// CHECK: #define __UINTPTR_MAX__ 4294967295UL
// CHECK: #define __UINTPTR_TYPE__ long unsigned int
// CHECK: #define __UINTPTR_WIDTH__ 32
// CHECK: #define __UINT_FAST16_MAX__ 65535
// CHECK: #define __UINT_FAST16_TYPE__ unsigned short
// CHECK: #define __UINT_FAST32_MAX__ 4294967295U
// CHECK: #define __UINT_FAST32_TYPE__ unsigned int
// CHECK: #define __UINT_FAST64_MAX__ 18446744073709551615UL
// CHECK: #define __UINT_FAST64_TYPE__ long long unsigned int
// CHECK: #define __UINT_FAST8_MAX__ 255
// CHECK: #define __UINT_FAST8_TYPE__ unsigned char
// CHECK: #define __UINT_LEAST16_MAX__ 65535
// CHECK: #define __UINT_LEAST16_TYPE__ unsigned short
// CHECK: #define __UINT_LEAST32_MAX__ 4294967295U
// CHECK: #define __UINT_LEAST32_TYPE__ unsigned int
// CHECK: #define __UINT_LEAST64_MAX__ 18446744073709551615UL
// CHECK: #define __UINT_LEAST64_TYPE__ long long unsigned int
// CHECK: #define __UINT_LEAST8_MAX__ 255
// CHECK: #define __UINT_LEAST8_TYPE__ unsigned char
// CHECK: #define __USER_LABEL_PREFIX__ _
// CHECK: #define __WCHAR_MAX__ 2147483647
// CHECK: #define __WCHAR_TYPE__ int
// CHECK-NOT: #define __WCHAR_UNSIGNED__ 1
// CHECK: #define __WCHAR_WIDTH__ 32
// CHECK: #define __WINT_TYPE__ int
// CHECK: #define __WINT_WIDTH__ 32
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