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toolchain: llvm: Provide working BUILD_ASSERT macro

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The resulting BUILD_ASSERT macro provided by
zephyr/toolchain/gcc.h is defined to be empty, making the macro
useless.

This commit ensures we define it to something that actually
performs a validation. When not compiling for C++ or >=C11,
we rely on that cdefs.h provides _Static_assert.

Signed-off-by: Rubin Gerritsen <rubin.gerritsen@nordicsemi.no>
This commit is contained in:
Rubin Gerritsen
2025-08-11 20:41:01 +02:00
committed by Benjamin Cabé
parent d632b1cfd9
commit 524b72ce40
1 changed files with 20 additions and 0 deletions
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20
include/zephyr/toolchain/llvm.h
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@@ -32,6 +32,26 @@
#include <zephyr/toolchain/gcc.h>
/* clear out common version. The build assert assert from gcc.h is defined to be empty */
#undef BUILD_ASSERT
#if defined(__cplusplus) && (__cplusplus >= 201103L)
/* C++11 has static_assert built in */
#define BUILD_ASSERT(EXPR, MSG...) static_assert(EXPR, "" MSG)
#elif !defined(__cplusplus) && ((__STDC_VERSION__) >= 201100)
/* C11 has static_assert built in */
#define BUILD_ASSERT(EXPR, MSG...) _Static_assert((EXPR), "" MSG)
#else
/* Rely on that the C-library provides a static assertion function */
#define BUILD_ASSERT(EXPR, MSG...) _Static_assert((EXPR), "" MSG)
#endif
#define TOOLCHAIN_WARNING_SIZEOF_ARRAY_DECAY "-Wsizeof-array-decay"
#define TOOLCHAIN_WARNING_UNNEEDED_INTERNAL_DECLARATION "-Wunneeded-internal-declaration"