Dear all,
I've been playing around with gem5 on my Mac and I get an odd linker error (see
below). This occurs using the stock gcc 4.2.1 from the latest Xcode, and
happens for ARM_FS and ARM_SE, but no other ISA. I poked around a bit and
managed to make the link error disappear using two different methods: 1) Remove
the inline in front of the Unknown::Unknown constructor in decoder.cc, 2) Move
the implementation of the Unknown::Unknown to the header file decoder.hh. All
other ISAs work fine, and they all have the definition in the header file. I
also ran nm on the decoder.o for the three options (broken, 1 and 2) to get an
idea of what is happening (see below).
I checked with google on c++ templates and inline and overall there seems to be
a lot of issues. Is this something you have stumbled upon before? Do you have
any suggestion on how to fix it permanently?
Thanks.
Andreas
----------------------------------------------------------------------
Undefined symbols for architecture x86_64:
"ArmISAInst::Unknown::Unknown(BitfieldBackend::BitUnionOperators<unsigned
long long, ArmISA::BitfieldUnderlyingClassesExtMachInst>)", referenced from:
ArmISA::VstSingleOp::VstSingleOp(char const*,
BitfieldBackend::BitUnionOperators<unsigned long long,
ArmISA::BitfieldUnderlyingClassesExtMachInst>, Enums::OpClass, bool, unsigned
int, unsigned short, unsigned short, unsigned int, unsigned int, unsigned int,
unsigned int, unsigned short, unsigned int)in macromem.o
ArmISA::VstMultOp::VstMultOp(char const*,
BitfieldBackend::BitUnionOperators<unsigned long long,
ArmISA::BitfieldUnderlyingClassesExtMachInst>, Enums::OpClass, unsigned int,
unsigned short, unsigned short, unsigned int, unsigned int, unsigned int,
unsigned int, unsigned short)in macromem.o
ArmISA::VldSingleOp::VldSingleOp(char const*,
BitfieldBackend::BitUnionOperators<unsigned long long,
ArmISA::BitfieldUnderlyingClassesExtMachInst>, Enums::OpClass, bool, unsigned
int, unsigned short, unsigned short, unsigned int, unsigned int, unsigned int,
unsigned int, unsigned short, unsigned int)in macromem.o
ArmISA::VldMultOp::VldMultOp(char const*,
BitfieldBackend::BitUnionOperators<unsigned long long,
ArmISA::BitfieldUnderlyingClassesExtMachInst>, Enums::OpClass, unsigned int,
unsigned short, unsigned short, unsigned int, unsigned int, unsigned int,
unsigned int, unsigned short)in macromem.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
scons: *** [build/ARM_FS/gem5.opt] Error 1
scons: building terminated because of errors.
Child returned 2
When attemping to execute: scons --ignore-style build/ARM_FS/m5.opt
build/ARM_FS/tests/opt/quick
----------------------------------------------------------------------
nm decoder.o | grep Unknown
Out-of-box gem5 with Unknown::Unknown in .cc and inline - BROKEN
U __ZTVN10ArmISAInst7UnknownE
----------------------------------------------------------------------
nm decoder.o | grep Unknown
Removing inline but keep Unknown::Unknown in .cc - WORKING
000000000063ae10 s
__GLOBAL__I__ZN10ArmISAInst7UnknownC2EN15BitfieldBackend17BitUnionOperatorsIyN6ArmISA36BitfieldUnderlyingClassesExtMachInstEEE
00000000007a0788 s
__GLOBAL__I__ZN10ArmISAInst7UnknownC2EN15BitfieldBackend17BitUnionOperatorsIyN6ArmISA36BitfieldUnderlyingClassesExtMachInstEEE.eh
0000000000001d3c T
__ZN10ArmISAInst7UnknownC1EN15BitfieldBackend17BitUnionOperatorsIyN6ArmISA36BitfieldUnderlyingClassesExtMachInstEEE
00000000007d64e8 S
__ZN10ArmISAInst7UnknownC1EN15BitfieldBackend17BitUnionOperatorsIyN6ArmISA36BitfieldUnderlyingClassesExtMachInstEEE.eh
0000000000000000 T
__ZN10ArmISAInst7UnknownC2EN15BitfieldBackend17BitUnionOperatorsIyN6ArmISA36BitfieldUnderlyingClassesExtMachInstEEE
00000000007a0750 S
__ZN10ArmISAInst7UnknownC2EN15BitfieldBackend17BitUnionOperatorsIyN6ArmISA36BitfieldUnderlyingClassesExtMachInstEEE.eh
U __ZTVN10ArmISAInst7UnknownE
----------------------------------------------------------------------
nm decoder.o | grep Unknown
Move Unknown::Unknown to .hh like other ISAs - WORKING
00000000006eb1cc S
__ZN10ArmISAInst7UnknownC1EN15BitfieldBackend17BitUnionOperatorsIyN6ArmISA36BitfieldUnderlyingClassesExtMachInstEEE
00000000007cea40 S
__ZN10ArmISAInst7UnknownC1EN15BitfieldBackend17BitUnionOperatorsIyN6ArmISA36BitfieldUnderlyingClassesExtMachInstEEE.eh
U __ZTVN10ArmISAInst7UnknownE
----------------------------------------------------------------------
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