diff options
Diffstat (limited to 'src/common/tuklib_common.h')
| -rw-r--r-- | src/common/tuklib_common.h | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/src/common/tuklib_common.h b/src/common/tuklib_common.h index b1f531ea..724b8c0e 100644 --- a/src/common/tuklib_common.h +++ b/src/common/tuklib_common.h @@ -57,8 +57,28 @@ # define TUKLIB_GNUC_REQ(major, minor) 0 #endif -#if TUKLIB_GNUC_REQ(2, 5) +// tuklib_attr_noreturn attribute is used to mark functions as non-returning. +// We cannot use "noreturn" as the macro name because then C23 code that +// uses [[noreturn]] would break as it would expand to [[ [[noreturn]] ]]. +// +// tuklib_attr_noreturn must be used at the beginning of function declaration +// to work in all cases. The [[noreturn]] syntax is the most limiting, it +// must be even before any GNU C's __attribute__ keywords: +// +// tuklib_attr_noreturn +// __attribute__((nonnull(1))) +// extern void foo(const char *s); +// +// FIXME: Update __STDC_VERSION__ for the final C23 version. 202000 is used +// by GCC 13 and Clang 15 with -std=c2x. +#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202000 +# define tuklib_attr_noreturn [[noreturn]] +#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112 +# define tuklib_attr_noreturn _Noreturn +#elif TUKLIB_GNUC_REQ(2, 5) # define tuklib_attr_noreturn __attribute__((__noreturn__)) +#elif defined(_MSC_VER) +# define tuklib_attr_noreturn __declspec(noreturn) #else # define tuklib_attr_noreturn #endif |