cpp and golang code fold problem

Hi everyone,

my .vimrc was 

set foldmethod=syntax 

filetype plugin indent on   " Automatically detect file types.

syntax enable

 syntax on  

                 

but  it cannot fold code if file was named like *.cpp, but it can work well if file was name *.c or *.cc.  golang code failed too.

my vim was installed by source code from github,runtime director is /usr/share/vim/vim80. 

I have export VIMRUNTIMEDIR= /usr/share/vim/vim80 in /etc/profile and source it.

vim version was 8.0.439. 

how can I fix this problem?

thanks

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