[Bug c/37509] New: __sync_fetch_and_xxx generates relocatable symbols

[Bug c/37509] New: __sync_fetch_and_xxx generates relocatable symbols

[timothy dot krause at shaw dot ca]

When __sync_fetch_and_xxx builtin functions are required to store the return
value the compiler generates an undefined reference during the link stage.

void main( void )
{
 long a=0;
 #ifndef SHOW_BUG
   __sync_fetch_and_add(&a,1); /* works just fine */
 #else
  a=__sync_fetch_and_add(&a,1); /* creates an undefined symbol */
 #endif
}


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           Summary: __sync_fetch_and_xxx generates relocatable symbols
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: timothy dot krause at shaw dot ca


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37509

[Bug c/37509] __sync_fetch_and_xxx generates relocatable symbols

[timothy dot krause at shaw dot ca]

------- Comment #1 from timothy dot krause at shaw dot ca  2008-09-13 15:24 -------
Tracing the parser suggests that the problem is in the
expand_sync_fetch_operation of optabs.c in gcc-4.3.2


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timothy dot krause at shaw dot ca changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |timothy dot krause at shaw
                   |                            |dot ca


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37509

[Bug c/37509] __sync_fetch_and_xxx generates relocatable symbols

[paolo dot carlini at oracle dot com]

------- Comment #2 from paolo dot carlini at oracle dot com  2008-09-13 22:07 -------
Host / Target / Build please...


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paolo dot carlini at oracle dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37509

[Bug c/37509] __sync_fetch_and_xxx generates relocatable symbols

[paolo dot carlini at oracle dot com]

------- Comment #3 from paolo dot carlini at oracle dot com  2008-09-13 22:25 -------
To be clear, I suspect you are on something like i?86-*, and in that case for
the default arch (-march=i386) this is the expected behavior...


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37509

[Bug middle-end/37509] __sync_fetch_and_xxx generates relocatable symbols

[pinskia at gcc dot gnu dot org]

------- Comment #4 from pinskia at gcc dot gnu dot org  2008-09-14 02:03 -------
This is invalid, it is the issue which Paolo mentioned.  I tried this on
PowerPC Linux and it works correctly.


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pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
          Component|c                           |middle-end
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37509

[Bug middle-end/37509] __sync_fetch_and_xxx generates relocatable symbols

[timothy dot krause at shaw dot ca]

------- Comment #5 from timothy dot krause at shaw dot ca  2008-09-23 22:53 -------
Setting
CFLAGS="-m32 -march=i686 -O2"
fixed the problem for
host=i686-pc-linux-gnu
target=i686-pc-linux-gnu
I later noticed that configure has a --with-cpu option. This generates a
-mcpu=i?86 option which also works but is depricated.
Thanks to Paolo Carlini for this fix.


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timothy dot krause at shaw dot ca changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   GCC host triplet|                            |i686-pc-linux-gnu
 GCC target triplet|                            |i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37509

[Bug middle-end/37509] __sync_fetch_and_xxx generates relocatable symbols

[timothy dot krause at shaw dot ca]

------- Comment #6 from timothy dot krause at shaw dot ca  2008-09-23 22:56 -------
(In reply to comment #5)
> Setting
> CFLAGS="-m32 -march=i686 -O2"
> fixed the problem for
> host=i686-pc-linux-gnu
> target=i686-pc-linux-gnu
> I later noticed that configure has a --with-cpu option. This generates a
> -mcpu=i?86 option which also works but is deprecated.
> Thanks to Paolo Carlini for this fix.
> 


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37509

[Bug middle-end/37509] __sync_fetch_and_xxx generates relocatable symbols

[pinskia at gcc dot gnu dot org]

------- Comment #7 from pinskia at gcc dot gnu dot org  2008-09-23 23:51 -------
You want --with-arch or -march=i686.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37509