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magic
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Compiler support for [[nodiscard]] via __discard__

This commit is contained in:
Darryl L. Miles 2025-02-13 11:24:40 +00:00
parent 705b4da105
commit 58c3cb7250
1 changed files with 17 additions and 0 deletions
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17
utils/magic.h
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@ -204,6 +204,21 @@ extern char AbortMessage[];
/* looking to squash excessive -Wpedantic warnings ? add into defs.mak: CPPFLAGS += -Wno-variadic-macros */
#define ANALYSER_NONNULL(n...) __attribute__((nonnull(n)))
#define ANALYSER_RETURNS_NONNULL __attribute__((returns_nonnull))
/* These have keyword like behaviour so __nodiscard__ looks more like a keyword and is recognisable as such
* the historic use of __inline__ set a precedent on how backward compatibiliy maybe achieved for such things
*/
#if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 202311L))
/* since C23 but maybe some compilers supported it before their official C23 releases */
#define __nodiscard__ [[nodiscard]]
#elif (defined(__GNUC__) && (__GNUC__ >= 4))
#define __nodiscard__ __attribute__((warn_unused_result))
#elif (defined(__clang__) && (__clang_major__ >= 1))
#define __nodiscard__ __attribute__((warn_unused_result))
#else
#define __nodiscard__ /* */
#endif
#else
#define ATTR_FORMAT_PRINTF_1 /* */
#define ATTR_FORMAT_PRINTF_2 /* */
@ -217,6 +232,8 @@ extern char AbortMessage[];
#define ANALYSER_MALLOC(dealloc, idx) /* */
#define ANALYSER_NONNULL(n...) /* */
#define ANALYSER_RETURNS_NONNULL /* */
#define __nodiscard__ /* */
#endif
/* ---------------- Start of Machine Configuration Section ----------------- */