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XL C/C++ for Linux Fix Pack 9 (August 2013 Update) for 11.1
June 2012 Update for XL C/C++ for Linux, V11.1
October 2012 Update for XL C/C++ for Linux, V11.1
XL C/C++ for Linux Fix Pack 8 (June 2013 Update) for 11.1
When compiling a test case that makes use of inline asm, you may
get a link error related to non virtual thunks.
Below is an example of the error message you may see:
$ //Link step
echo Linking...
`_ZThn4_N7madness19DependencyInterfaceD1Ev' referenced in
section `.rodata' of libMADworld.a(worldtask.o): defined in
discarded section
`.gnu.linkonce.t._ZThn4_N7madness19DependencyInterfaceD1Ev' of
libMADworld.a(worldtask.o)
`_ZThn4_N7madness19DependencyInterfaceD0Ev' referenced in
section `.rodata' of libMADworld.a(worldtask.o): defined in
discarded section
`.gnu.linkonce.t._ZThn4_N7madness19DependencyInterfaceD0Ev' of
libMADworld.a(worldtask.o)
If you do a c++filt on the above symbols, you get:
$c++filt _ZThn4_N7madness19DependencyInterfaceD1Ev
non-virtual thunk to
madness::DependencyInterface::~DependencyInterface()
Local fix
Problem summary
USERS AFFECTED:
Users using assembly and C++ thunks may be affected by this
issue.
PROBLEM DESCRIPTION:
GNU linker (ld) reports link errors when xlCcode generates c++
thunk sections. The reason is c++ thunk sections are made as
'linkonce' but will be referred locally from .rodata.
In this condition, since there may be section discarded (from
different object files), ld can not guarantee the reference is
local.
Therefore the error is reported.
Problem conclusion
The compiler has been fixed to make the 'linkonce' symbols
globally week, which eliminates this error.
Temporary fix
Comments
APAR Information
APAR number
LI76793
Reported component name
XL C/C++ FOR LI
Reported component ID
5724X1400
Reported release
B10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2012-05-24
Closed date
2012-05-24
Last modified date
2012-05-24
APAR is sysrouted FROM one or more of the following:
LI76610
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
XL C/C++ FOR LI
Fixed component ID
5724X1400
Applicable component levels
UP06/09/13
