[BUG] Got "Expected class-name before '{' token" error when compiling under manjaro

[jiangjiechu]

My cmake flag is
$ cmake -B build -DEXTENSION_gmpm:BOOL=ON -DEXTENSION_mesher:BOOL=ON -DEXTENSION_FastFLIP:BOOL=ON -DEXTENSION_zenvdb:BOOL=ON -DZENOFX_ENABLE_OPENVDB:BOOL=ON -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON
Got error while compiling /projects/gmpm/zecomp/include/zensim/cuda/Cuda.cu:
/home/peter/zeno/projects/gmpm/zecomp/include/zensim/meta/Sequence.h:132:189: 错误：expected class-name before ‘{’ token 132 | struct shuffle_convert_impl<Unary, index_seq<Js...>> | ^ /home/peter/zeno/projects/gmpm/zecomp/include/zensim/meta/Sequence.h:141:188: 错误：expected class-name before ‘{’ token 141 | template <std::size_t... Js> struct shuffle_impl<index_seq<Js...>> | ^ /home/peter/zeno/projects/gmpm/zecomp/include/zensim/meta/Sequence.h:211:189: 错误：expected class-name before ‘{’ token 211 | template <std::size_t... Js> struct shuffle_impl<index_seq<Js...>> | ^
I guess it is an c++17 related preprocessing error with the fold expression struct shuffle_convert_impl<Unary, index_seq<Js...>>, but I don't know whether c++17 is enabled, the verbose output of make shows that there is no -std=c++17 flag.

Eventhough I manually add -std=c++17 flag and recompile the file the error is still there:

My nvcc supports c++17

Environment

• System: Manjaro Linux [x86_64]
• Zeno Version: 2021.12.20
• Graphics card (for viewport bugs): RTX 3070 Mobile / Max-Q

[littlemine]

I tried building the latest zeno (5807dee) with these extensions enabled and all submodules updated (especially zecomp) under ubuntu20.04 and cuda 11.5 (>=11.3 should be enough), and did not encounter such an error.
Can you share the cuda version and the commit hash of zecomp you are building zeno with?

[jiangjiechu]

Sorry for late response.
My cuda version is 11.5

I uses submodule zecomp of commit zenustech/zpc@ff6d647.
Besides, I have modified all the find_package(TBB ...) command to find_package(TBB CONFIG ...) to solve "TBB not found" errors (seems that projects/cmake/FindTBB.cmake wouldn't find the latest tbb installed in manjaro). That is almost all changes I have made on the repo.

[littlemine]

Thanks for the information. Then I suppose it has something to do with manjaro linux. I'll look into this issue soon and get back to you.

[littlemine]

I encountered the same issue under a similar setup as yours under manjaro, and pushed a fix (zenustech/zpc@c302735) as the work around. Thanks for the report!
I also noticed that the tseq and vseq implementations are quite verbose and outdated. I will spend some time clean this part soon.