Dear gem5 faculties:
Hi! I’ve been trying to follow the getting started guide on the gem5 website,
and encountered this question in “Creating a very simple SimObject” part of the
tutorial. I removed the files under src/learning_gem5/part2, and substituted
them with the following files, content of which are precisely copied down from
the tutorial:
However, when I tried to recompile the gem5.opt, the following error was shown:
In file included from build/X86/learning_gem5/part_new/hello_object.cc:2:
build/X86/learning_gem5/part_new/hello_object.hh:8:1: error: expected
class-name before '{' token
8 | {
| ^
build/X86/learning_gem5/part_new/hello_object.hh:10:27: error:
'HelloObjectParams' does not name a type; did you mean 'HelloObject'?
10 | HelloObject(const HelloObjectParams &p);
| ^~~~~~~~~~~~~~~~~
| HelloObject
build/X86/learning_gem5/part_new/hello_object.cc:6:32: error:
'HelloObjectParams' does not name a type; did you mean 'HelloObject'?
6 | HelloObject::HelloObject(const HelloObjectParams &p) : SimObject(p)
| ^~~~~~~~~~~~~~~~~
| HelloObject
build/X86/learning_gem5/part_new/hello_object.cc: In constructor
'HelloObject::HelloObject(const int&)':
build/X86/learning_gem5/part_new/hello_object.cc:6:56: error: class
'HelloObject' does not have any field named 'SimObject'
6 | HelloObject::HelloObject(const HelloObjectParams &p) : SimObject(p)
| ^~~~~~~~~
[SO Param] m5.objects.Ethernet, EtherLink -> X86/params/EtherLink.hh
[SO Param] m5.objects.Ethernet, DistEtherLink -> X86/params/DistEtherLink.hh
[SO Param] m5.objects.Ethernet, Sinic -> X86/params/Sinic.hh
[SO Param] m5.objects.FuncUnit, FUDesc -> X86/params/FUDesc.hh
[SO Param] m5.objects.InstPBTrace, InstPBTrace -> X86/params/InstPBTrace.hh
scons: *** [build/X86/learning_gem5/part_new/hello_object.o] Error 1
scons: building terminated because of errors.
It seems that the HelloObject sources cant find HelloObjectParams and SimObject
definitions. However, after throwing everything in the header and the source
file under namespace gem5, and adding cxx_class member in the python class
definition, everything seems to work out fine. So is it an issue that needs to
be fixed in the tutorial, or is the namespace inclusion unnecessary here?
Thanks!
Zhiyuan Zhang
2022.2.2
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