Namespaces were recently added to gem5 and the documentation hasn't been
updated, yet. We'll put that on the to do list.
Cheers,
Jason
On Wed, Feb 2, 2022 at 6:11 AM Zhang Zhiyuan via gem5-users <
gem5-users@gem5.org> wrote:
> 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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