[LLVMbugs] [Bug 9133] New: clang emits crashing code at -O0

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Feb 3 12:03:09 PST 2011


           Summary: clang emits crashing code at -O0
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: regehr at cs.utah.edu
                CC: llvmbugs at cs.uiuc.edu, chenyang at cs.utah.edu

I believe this was introduced fairly recently, probably in the last 5 days.

[regehr at gamow tmp002]$ clang -O0 small.c -o small
[regehr at gamow tmp002]$ ./small 
Segmentation fault
[regehr at gamow tmp002]$ clang -v

clang version 2.9 (trunk 124809)
Target: x86_64-unknown-linux-gnu
Thread model: posix

[regehr at gamow tmp002]$ cat small.c

static int g_1 = 0;
static int g_2 = 0;
static int *g_3 = 0;

static int *foo(int p)
   char l_1[7][2][4];
   int *l_2[5];
   int l_3;
   return &g_2;

int main(int argc, char* argv[])
   g_3 = foo(1);
   g_1 = *g_3;
   return 0;

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