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LibC: Allow multiple includes of <assert.h>

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ISO C requires in section 7.2:
The assert macro is redefined according to the current state of NDEBUG
each time that <assert.h> is included.

Also add tests for `assert` multiple inclusion accordingly.
This commit is contained in:
Michel Hermier 2021-12-14 17:44:43 +01:00 • committed by Brian Gianforcaro
parent 7b8398ea0d
commit 682f89d5bc
3 changed files with 36 additions and 7 deletions
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19
Userland/Libraries/LibC/assert.h
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@ -4,16 +4,25 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#ifndef _ASSERT_H
# define _ASSERT_H
# define __stringify_helper(x) # x
# define __stringify(x) __stringify_helper(x)
# ifndef __cplusplus
# define static_assert _Static_assert
# endif
#endif
#include <sys/cdefs.h>
#undef assert
__BEGIN_DECLS
#ifndef NDEBUG
__attribute__((noreturn)) void __assertion_failed(const char* msg);
# define __stringify_helper(x) # x
# define __stringify(x) __stringify_helper(x)
# define assert(expr) \
(__builtin_expect(!(expr), 0) \
? __assertion_failed(#expr "\n" __FILE__ ":" __stringify(__LINE__)) \
@ -23,8 +32,4 @@ __attribute__((noreturn)) void __assertion_failed(const char* msg);
# define assert(expr) ((void)(0))
#endif
#ifndef __cplusplus
# define static_assert _Static_assert
#endif
__END_DECLS