`:make` not echoing output to the command line

Question

I have a simple makefile as follow:

all: A.cpp
    g++ -o A.exe A.cpp 
    .\A

In A.cpp,

#include <iostream>
using namespace std;
int main() {
    cout << "Hello World!\n" << '\n';
    return 0;
}

In Neovim, if I run :!make, I get what I expect:

:!make
g++ -o A.exe A.cpp
.\A
Hello World!

But :make gives

:!make  >C:\Users\yeung\AppData\Local\Temp\nvimHfW5tI\3 2>&1

(1 of 5): <ff><fe>g

Although it also compiled A.cpp but the output is not seen. How to make :make to output "Hello World"?

Another question is what should I do so that Neovim can take input from stdin when I run :make?

My init.vim

call plug#begin(stdpath('data') . '/plugged')

Plug 'Valloric/YouCompleteMe'
Plug 'vim-airline/vim-airline'
Plug 'vim-airline/vim-airline-themes'
Plug 'Raimondi/delimitMate'
Plug 'preservim/nerdtree'
"Plug 'vim-scripts/c.vim'

call plug#end()

set number
set tabstop=4
set shiftwidth=4
set expandtab
set termguicolors
set mouse=a
set foldmethod=syntax
set nofoldenable

let g:airline_powerline_fonts = 1
let g:ycm_autoclose_preview_window_after_completion = 1
let g:delimitMate_expand_cr = 1 
let mapleader = "\<Space>"

"enable powershell in nvim
let &shell = has('win32') ? 'powershell' : 'pwsh'
set shellquote= shellxquote= 
set shellcmdflag=-NoLogo\ -NoProfile\ -ExecutionPolicy\ RemoteSigned\ -Command
set shellredir=\|\ Out-File\ -Encoding\ UTF8


inoremap <C-Z> <C-O>u

nnoremap <C-Z> u
nnoremap <Leader>o o<Esc>
nnoremap <Leader>O O<Esc>
nnoremap <C-J> i<CR><Esc>  
nnoremap <F9> :YcmCompleter FixIt<CR>
nnoremap <F10> :w<CR>:!make %<<CR>
nnoremap <leader>to :YcmCompleter GoToDeclaration<CR>
nnoremap <leader>n :NERDTreeFocus<CR>
nnoremap <C-t> :NERDTreeToggle<CR>
nnoremap <C-f> :NERDTreeFind<CR>

autocmd FileType makefile set noexpandtab.

Answer 1

This happens because a 'shellpipe' of the default of > (which is the default on Windows) doesn't really work on Powershell. It seems to have it produce a file that uses UTF-16 encoding and then NeoVim has trouble parsing the Unicode BOM character at the beginning of it.

The 'shellredir' setting gives us a good clue of how to solve it... So just setting 'shellpipe' to the same should fix it:

set shellpipe=\|\ Out-File\ -Encoding\ UTF8

It seems that the NeoVim recommendations for 'shellpipe' when using Powershell are incorrect, so I opened Issue #13713 to report this documentation problem to the NeoVim project.

Answer 2

When you run your code with :make, the result is put into the quickfix list, you can open it with :cope

See help :make See help quickfix

You can also make your own command that show immediatelly your results:

command! -nargs=* Make :make <args> | cope

You just have to use :Make instead of :make to run your programm and be prompted to the quickfix list.

See :help command