[Bug target/53440] New: [arm] generic thunk code fails for method which uses '...'

[Bug target/53440] New: [arm] generic thunk code fails for method which uses '...'

[rmansfield at qnx dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53440

             Bug #: 53440
           Summary: [arm] generic thunk code fails for method which uses
                    '...'
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: rmansfield@qnx.com


This is a target bug but it's related to bug 7618 (which was mips specific).
I'm opening a new PR for arm-gnueabi as it is a primary target

$ ./xgcc -v
Using built-in specs.
COLLECT_GCC=./xgcc
Target: arm-unknown-linux-gnueabi
Configured with: ../configure --target=arm-unknown-linux-gnueabi
--prefix=/home/ryan/x-tools/arm-unknown-linux-gnueabi
--with-sysroot=/home/ryan/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi//sys-root
--disable-multilib
--with-local-prefix=/home/ryan/x-tools/arm-unknown-linux-gnueabi/arm-unknown-linux-gnueabi/sys-root
--disable-nls --enable-threads=posix --enable-symvers=gnu --enable-c99
--enable-long-long --enable-target-optspace
target_alias=arm-unknown-linux-gnueabi --enable-languages=c++ --disable-shared
--disable-libmudflap --disable-libssp --enable-checking
Thread model: posix
gcc version 4.8.0 20120521 (experimental) [trunk revision 187727] (GCC) 
$ ./xgcc -B. ~/t.cc
/home/ryan/t.cc:18:1: error: generic thunk code fails for method 'virtual void
Test::Log(const char*, ...)' which uses '...'
 }};
 ^

[Bug target/53440] [arm] generic thunk code fails for method which uses '...'

[rmansfield at qnx dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53440

--- Comment #1 from Ryan Mansfield <rmansfield at qnx dot com> 2012-05-21 18:04:03 UTC ---
Created attachment 27463
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27463
test case

[Bug target/53440] [arm] generic thunk code fails for method which uses '...'

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53440

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-05-21 18:55:04 UTC ---
Someone needs to implement the thunk functionality for arm.

[Bug target/53440] [arm] generic thunk code fails for method which uses '...'

[ramana at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53440

Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-05-22
                 CC|                            |ramana at gcc dot gnu.org
     Ever Confirmed|0                           |1

[Bug target/53440] [arm] generic thunk code fails for method which uses '...'

[rearnsha at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53440

--- Comment #3 from Richard Earnshaw <rearnsha at gcc dot gnu.org> 2012-05-22 16:36:56 UTC ---
(In reply to comment #2)
> Someone needs to implement the thunk functionality for arm.

The ARM port does have MI thunk support.  The question is "why isn't it being
used"?

R.

[Bug target/53440] [arm] generic thunk code fails for method which uses '...'

[rmansfield at qnx dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53440

--- Comment #4 from Ryan Mansfield <rmansfield at qnx dot com> 2012-05-23 00:12:59 UTC ---
(In reply to comment #3)
> (In reply to comment #2)
> > Someone needs to implement the thunk functionality for arm.
> 
> The ARM port does have MI thunk support.  The question is "why isn't it being
> used"?

I may be answering the question too directly but it's using the
default_can_output_mi_thunk_no_vcall and vcall_offset is non-zero. The ARM MI
thunk code doesn't do any vcall offset adjustment.

[Bug target/53440] [arm] generic thunk code fails for method which uses '...'

[ramana at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53440

Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jgreenhalgh at gcc dot gnu.org

--- Comment #5 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
*** Bug 66755 has been marked as a duplicate of this bug. ***