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restore _Noreturn to __assert_fail

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this reverts commit 2c1f8fd5da. without
the _Noreturn attribute, the compiler cannot use asserts to perform
reachability/range analysis. this leads to missed optimizations and
spurious warnings.

the original backtrace problem that prompted the removal of _Noreturn
was not clearly documented at the time, but it seems to happen only
when libc was built without -g, which also breaks many other
backtracing cases.
This commit is contained in:
Rich Felker 2016-08-30 16:39:54 -04:00
parent 397586625e
commit e738b8cbe6
2 changed files with 2 additions and 2 deletions
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2
include/assert.h
View File

@ -16,7 +16,7 @@
extern "C" {
#endif
void __assert_fail (const char *, const char *, int, const char *);
_Noreturn void __assert_fail (const char *, const char *, int, const char *);
#ifdef __cplusplus
}

2
src/exit/assert.c
View File

@ -1,7 +1,7 @@
#include <stdio.h>
#include <stdlib.h>
void __assert_fail(const char *expr, const char *file, int line, const char *func)
_Noreturn void __assert_fail(const char *expr, const char *file, int line, const char *func)
{
fprintf(stderr, "Assertion failed: %s (%s: %s: %d)\n", expr, file, func, line);
fflush(NULL);