git: 235fe911df59 - stable/14 - include: add a userland version of __assert_unreachable

The branch stable/14 has been updated by christos:

URL: https://cgit.FreeBSD.org/src/commit/?id=235fe911df596333ea63152baa7ec4eecdeb7d12

commit 235fe911df596333ea63152baa7ec4eecdeb7d12
Author:     Kyle Evans <kevans@FreeBSD.org>
AuthorDate: 2025-01-13 00:41:25 +0000
Commit:     Christos Margiolis <christos@FreeBSD.org>
CommitDate: 2025-03-18 12:55:24 +0000

    include: add a userland version of __assert_unreachable
    
    The kernel has had a version of this since
    c79cee71363d ("kernel: provide panicky version of __unreachable"), and
    userland can benefit from the same.  __unreachable is largely
    inadequate because it's *not* an assertion of any sort, so we're not
    really alerted to a problem that we could've anticipated.
    
    Reviewed by:    emaste, imp, jhb, olce
    Differential Revision:  https://reviews.freebsd.org/D48077
    
    (cherry picked from commit 712f81feea416e9f8aaf040173883876a50a7d34)
---
 include/assert.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/assert.h b/include/assert.h
index 54e1456b9e0d..b483465dfc5f 100644
--- a/include/assert.h
+++ b/include/assert.h
@@ -45,15 +45,22 @@
 
 #undef assert
 #undef _assert
+#undef __assert_unreachable
 
 #ifdef NDEBUG
 #define	assert(e)	((void)0)
 #define	_assert(e)	((void)0)
+#if __BSD_VISIBLE
+#define	__assert_unreachable()	__unreachable()
+#endif	/* __BSD_VISIBLE */
 #else
 #define	_assert(e)	assert(e)
 
 #define	assert(e)	((e) ? (void)0 : __assert(__func__, __FILE__, \
 			    __LINE__, #e))
+#if __BSD_VISIBLE
+#define	__assert_unreachable()	assert(0 && "unreachable segment reached")
+#endif	/* __BSD_VISIBLE */
 #endif /* NDEBUG */
 
 #ifndef _ASSERT_H_