From 1b640dff5759d73458204c87e217dab8759badd9 Mon Sep 17 00:00:00 2001 From: Ivan Shapovalov Date: Sun, 12 Mar 2023 20:08:40 +0400 Subject: Compat: implement static_assert() shim for pre-C11 --- Compat.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/Compat.h b/Compat.h index 1c4794e6..b83fc3d8 100644 --- a/Compat.h +++ b/Compat.h @@ -9,6 +9,7 @@ in the source distribution for its full text. #include "config.h" // IWYU pragma: keep +#include // IWYU pragma: keep #include #include #include @@ -61,4 +62,26 @@ ssize_t Compat_readlink(openat_arg_t dirfd, char* buf, size_t bufsize); +/* + * static_assert() hack for pre-C11 + * TODO: drop after moving to -std=c11 or newer + */ + +/* C11 guarantees _Static_assert is a keyword */ +#if (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112L +# if !defined(_Static_assert) +# define _Static_assert(expr, msg) \ + extern int (*__Static_assert_function (void)) \ + [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })] +# endif +#endif + +/* C23 will guarantee static_assert is a keyword or a macro */ +/* FIXME: replace 202300L with proper value once C23 is published */ +#if (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 202300L +# if !defined(static_assert) +# define static_assert(expr, msg) _Static_assert(expr, msg) +# endif +#endif + #endif /* HEADER_Compat */ -- cgit v1.2.3