Date: Fri, 27 Dec 2013 13:52:29 +0200 From: Markiyan Kushnir <markiyan.kushnir@gmail.com> To: freebsd-hackers@freebsd.org Subject: clang lacks undefined behavior sanitizer (ubsan) on FreeBSD? Message-ID: <CACvtUJcujNRgJAdh-TPXApQbrbKW5gEfdbakOQozfKdMt7Qyhw@mail.gmail.com>
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Trying to make benefit out of -fsanitize=undefined and failing on
11-CURRENT r259742. A minimal test case:
13:45:tmp$ cat ttt.c
#include <stdio.h>
int
main(void)
{
int i, j = 0xffffffff;
for (i = 0; i < 2; ++i) {
j <<= 1;
printf("j=%x\n", j);
}
return 0;
}
13:45:tmp$ clang -Qunused-arguments -fcolor-diagnostics -g -O0
-fsanitize=undefined -Wall -Wextra -Werror -std=c99 ttt.c
/tmp/ttt-RJPqDj.o: In function `main':
/tmp/ttt.c:9: undefined reference to `__ubsan_handle_shift_out_of_bounds'
/tmp/ttt.c:8: undefined reference to `__ubsan_handle_add_overflow'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
The ports version (both clang33 and clang34) neither seems to take
care of it, as I could see in
llvm.src/tools/clang/runtime/compiler-rt/Makefile
Am I missing anything?
--
Markiyan.
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