https://bugs.llvm.org/show_bug.cgi?id=46418
Bug ID: 46418
Summary: Sanitizers don't work with ThinLTO and new pass
manager at opt level > 0
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: tomasz.mia...@gmail.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
yuanfang.c...@sony.com
CC: yuanfang.c...@sony.com
When using ThinLTO and -fexperimental-new-pass-manager at optimization
level > 0, sanitizer passes are registered using
registerOptimizerLastEPCallback
but the pre-link pipeline constructed with buildThinLTOPreLinkDefaultPipeline
doesn't include optimization pipeline and those callbacks are never invoked.
Thus the sanitizer instrumentation is not performed at all.
Example:
$ cat a.cpp
#include <string.h>
int main(int argc, char **argv) {
char x[10];
memset(x, 0, 10);
int res = x[argc * 10];
return res;
}
$ clang -fexperimental-new-pass-manager -flto=thin -fsanitize=address -O1 a.cpp
$ ./a.out
$ # No error report.
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