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zig.h: Use C99/C11 headers if available regardless of language standard.

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If present, these headers are usable even when compiling for older C language
versions.

Most notably, this enables zig.h atomics to work with slimcc and TinyCC in C99
mode (and earlier).
This commit is contained in:
Alex Rønne Petersen
2024-12-02 09:42:39 +01:00
parent 1c43c2c209
commit 0e934c7df1
1 changed files with 10 additions and 3 deletions
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13
lib/zig.h
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@@ -68,9 +68,16 @@
#define zig_x86
#endif
#if defined(__has_include)
#define zig_has_include(include) __has_include(include)
#else
#define zig_has_include(include) 0
#endif
#ifndef __STDC_WANT_IEC_60559_TYPES_EXT__
#define __STDC_WANT_IEC_60559_TYPES_EXT__
#endif
#include <float.h>
#include <limits.h>
#include <stdarg.h>
@@ -82,7 +89,7 @@
#if __STDC_VERSION__ >= 202311L
/* bool, true, and false are provided by the language. */
#elif __STDC_VERSION__ >= 199901L
#elif __STDC_VERSION__ >= 199901L || zig_has_include(<stdbool.h>)
#include <stdbool.h>
#else
typedef char bool;
@@ -428,7 +435,7 @@ zig_extern void *memset (void *, int, size_t);
/* ===================== 8/16/32/64-bit Integer Support ===================== */
#if __STDC_VERSION__ >= 199901L || defined(zig_msvc)
#if __STDC_VERSION__ >= 199901L || defined(zig_msvc) || zig_has_include(<stdint.h>)
#include <stdint.h>
#else
@@ -3655,7 +3662,7 @@ zig_float_builtins(64)
res = zig_atomicrmw_expected; \
} while (0)
#if __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_ATOMICS__)
#if (__STDC_VERSION__ >= 201112L || (zig_has_include(<stdatomic.h>) && !defined(zig_msvc))) && !defined(__STDC_NO_ATOMICS__)
#include <stdatomic.h>
typedef enum memory_order zig_memory_order;
#define zig_memory_order_relaxed memory_order_relaxed