Message152007
In non-debug mode the read_null test fails with clang-3.0:
======================================================================
FAIL: test_disable (test.test_faulthandler.FaultHandlerTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/usr/home/stefan/hg/cpython/Lib/test/test_faulthandler.py", line 235, in test_disable
self.assertNotEqual(exitcode, 0)
AssertionError: 0 == 0
clang "optimizes" the undefined behavior into a simple assignment:
$ ~/usr/bin/clang --version
clang version 3.0 (tags/RELEASE_30/final)
Target: x86_64-unknown-freebsd9.0
Thread model: posix
$
$ cat read_null.c
#include <stdio.h>
int
main(void)
{
int *x = NULL, y;
y = *x;
printf("%d\n", y);
return 0;
}
$
$ ~/usr/bin/clang -Wall -O0 -g -o read_null read_null.c
$ ./read_null
Segmentation fault: 11 (core dumped)
$ ~/usr/bin/clang -Wall -O3 -g -o read_null read_null.c
$ ./read_null
0 |
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Date |
User |
Action |
Args |
2012-01-26 13:34:47 | skrah | set | recipients:
+ skrah, vstinner |
2012-01-26 13:34:47 | skrah | set | messageid: <1327584887.45.0.833971151143.issue13874@psf.upfronthosting.co.za> |
2012-01-26 13:34:46 | skrah | link | issue13874 messages |
2012-01-26 13:34:45 | skrah | create | |
|