[Bug lto/43038] New: DECL_PRESERVE_P static globals not completely preserved with -flto

[Bug lto/43038] New: DECL_PRESERVE_P static globals not completely preserved with -flto

[baldrick at gcc dot gnu dot org]

The fact that LinkObj is initialized with LinkVar does not seem to be
preserved when using -flto:

extern const char LinkVar;
__attribute__((used)) static const char *const LinkObj = LinkVar;


-- 
           Summary: DECL_PRESERVE_P static globals not completely preserved
                    with -flto
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: baldrick at gcc dot gnu dot org
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43038

[Bug lto/43038] DECL_PRESERVE_P static globals not completely preserved with -flto

[rguenth at gcc dot gnu dot org]

------- Comment #1 from rguenth at gcc dot gnu dot org  2010-02-11 16:42 -------
Confirmed.

The following fails to link with -flto

static int foobar __attribute__((used));
extern void abort (void);
int main()
{
  int res;
  asm("movl foobar(%%rip), %0" : "=g" (res));
  if (res != 0)
    abort ();
  return 0;
}


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |lto, wrong-code
   Last reconfirmed|0000-00-00 00:00:00         |2010-02-11 16:42:09
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43038

[Bug lto/43038] DECL_PRESERVE_P static globals not completely preserved with -flto

[baldrick at gcc dot gnu dot org]

------- Comment #2 from baldrick at gcc dot gnu dot org  2010-02-11 16:42 -------
Sorry, small bug in the testcase, should have been:

extern const char LinkVar;
__attribute__((used)) static const char *const LinkObj = &LinkVar;


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43038

[Bug lto/43038] DECL_PRESERVE_P static globals not completely preserved with -flto

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2010-04-23 16:14 -------
Honza, you might want to have a look here.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hubicka at gcc dot gnu dot
                   |                            |org
   Last reconfirmed|2010-02-11 16:42:09         |2010-04-23 16:14:36
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43038

[Bug lto/43038] DECL_PRESERVE_P static globals not completely preserved with -flto

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2010-06-03 15:13 -------
Re-confirmed on trunk.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2010-04-23 16:14:36         |2010-06-03 15:13:52
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43038

[Bug lto/43038] DECL_PRESERVE_P static globals not completely preserved with -flto

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2010-06-03 15:14 -------
Ah, it does not work because we mangle foobar to foobar.1234, not because
we eliminate it.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43038

[Bug lto/43038] DECL_PRESERVE_P static globals not completely preserved with -flto

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2010-06-06 10:32 -------
*** Bug 44429 has been marked as a duplicate of this bug. ***


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |astrange at ithinksw dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43038