Studio 12: C compiler generates bad code with -m64 -KPIC -xO2

Question

Hello,
after upgrading my Solaris 10/x64 machine from Studio 11 to Studio 12 some problems were fixed, but others came up; like this one:
I have a code snippet that obviously causes the C compiler to generate wrong code if compiled with options -m64 -KPIC -xO2. If any of these options are missing, it runs fine. Here's the example code:
#include <stdio.h>
#include <strings.h>
static int do_something() { return 0; }
static int foo() {
    fprintf(stderr, "\n!! BUG: BAD CODE! unexpected function call foo()!\n\n");
    return 222;
static int bar() {
    fprintf(stdout, "\nOK: bar() called\n\n");
    return 0;
static const struct {
    const char* name;
    int (*func)();
    int flag;
} tab[] = {
    { "foo",  &foo,  0 },
    { "bar",  &bar,  0 },
    { 0, 0, 0 }
int main(int argc, const char** argv) {
    int i;
    for (i=0; tab.name; i++) {
if( strcmp(tab[i].name, "bar") == 0 ) {
if(tab[i].flag) {   /* not reached */
if(!do_something()) {
return 2;
return (*tab[i].func)();
return 1; /* not reached */
Many lines seem to be bogus, but they are actually needed to reproduce the problem.
This is what happens:# cc -m64 -KPIC -xO2 bug.c && ./a.out ; echo $?
!! BUG: BAD CODE! unexpected function call foo()!
222
If I compile with debugging information (-g), I get expected behavior, which is:# cc -m64 -KPIC -g bug.c && ./a.out ; echo $?
OK: bar() called
0
While creating the test case I've also seen SIGSEGV at runtime in the bug case - which is probably due to a wrong calculated function address for jmp (just guessing).
Does anyone know if this is a known bug?
Any help is appreciated.
The rest of this posting is information about my system and Studio 12 patch level:# uname -a
SunOS v20 5.10 Generic_137112-08 i86pc i386 i86pc
# /usr/SUNWspro/bin/version
Machine hardware: i86pc
OS version: 5.10
Processor type: i386
Hardware: i86pc
The following components are installed on your system:
Sun Studio 12
Sun Studio 12 C Compiler
Sun Studio 12 C++ Compiler
Sun Studio 12 Tools.h++ 7.1
Sun Studio 12 C++ Standard 64-bit Class Library
Sun Studio 12 Garbage Collector
Sun Studio 12 Fortran 95
Sun Studio 12 Debugging Tools (including dbx)
Sun Studio 12 IDE
Sun Studio 12 Debugger GUI
Sun Studio 12 Performance Analyzer (including collect, ...)
Sun Studio 12 X-Designer
Sun Studio 12 VIM editor
Sun Studio 12 XEmacs editor
Sun Studio 12 Performance Library
Sun Studio 12 LockLint
Sun Studio 12 Building Software (including dmake)
Sun Studio 12 Documentation Set
Sun Studio 12 /usr symbolic links and GNOME menu item
version of "/usr/SUNWspro/bin/../prod/bin/../../bin/cc": Sun C 5.9 SunOS_i386 Patch 124868-07 2008/10/07
version of "/usr/SUNWspro/bin/../prod/bin/../../bin/CC": Sun C++ 5.9 SunOS_i386 Patch 124864-08 2008/10/16
version of "/usr/SUNWspro/bin/../prod/bin/../../bin/f90": Sun Fortran 95 8.3 SunOS_i386 Patch 127002-04 2008/04/16
version of "/usr/SUNWspro/bin/../prod/bin/../../bin/dbx": Sun Dbx Debugger 7.6 SunOS_i386 Patch 124873-06 2008/08/20
version of "/usr/SUNWspro/bin/../prod/bin/../../bin/analyzer": Sun Analyzer 7.6 SunOS_i386 Patch 126996-04 2008/09/03
version of "/usr/SUNWspro/bin/../prod/bin/../../bin/dmake": Sun Distributed Make 7.8 SunOS_i386 Patch 126504-01 2007/07/19

Answer 1

I'm watching Bug ID: [6774287|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6774287] for quite a while and it seems to be fixed some time ago (State: 8-Fix Available, bug). Does anybody know if the fix made it in some officially available SunStudio 12 C compiler (backend) patch already? I'm using this SS12 patch-level meanwhile:
# /usr/SUNWspro/bin/version
version of "/usr/SUNWspro/bin/../prod/bin/../../bin/cc": Sun C 5.9 SunOS_i386 Patch 124868-08 2008/11/25
version of "/usr/SUNWspro/bin/../prod/bin/../../bin/CC": Sun C++ 5.9 SunOS_i386 Patch 124864-09 2008/12/16
version of "/usr/SUNWspro/bin/../prod/bin/../../bin/f90": Sun Fortran 95 8.3 SunOS_i386 Patch 127002-05 2008/10/21
version of "/usr/SUNWspro/bin/../prod/bin/../../bin/dbx": Sun Dbx Debugger 7.6 SunOS_i386 Patch 124873-06 2008/08/20
version of "/usr/SUNWspro/bin/../prod/bin/../../bin/analyzer": Sun Analyzer 7.6 SunOS_i386 Patch 126996-04 2008/09/03
version of "/usr/SUNWspro/bin/../prod/bin/../../bin/dmake": Sun Distributed Make 7.8 SunOS_i386 Patch 126504-01 2007/07/19