MSYS2/MingW64 compilation failure

[Martin]

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Issue Details

Provide a clear description of the problem, including the following key
questions:

• What did you do?

Attempted installation through vim-plug and subsequent CLI steps to build YCM. The build subsequently fails in one of two ways.

1. It fails on account of not being able to find the libclang it downloaded itself, and halts.

2. It fails when using --system-libclang

   • It first emits errors about unicode points
   • it subsequently fails the build later on

3. PlugInstall 'ycm-core/YouCompleteMe'

4. Add Plug 'ycm-core/YouCompleteMe' to .vimrc

5. :wq

6. cd ~/.vim/plugged/YouCompleteMe

7. python3.11 install.py --clang-completer --rust-completer --verbose (fails to find the libclang it downloads) or python3.11 install.py --clang-completer --rust-completer --verbose --system-libclang (errors in compilation)

   • I added > ~/ycmd_build[-sys].log 2>&1 to the commands to produce the attached log files

• What did you expect to happen?

Successful compilation and use of YCM

• What actually happened?

Include description of the observed behaviour, including actual output,
Without --system-libclang
With --system-libclang, zipped because it's 46MB
Failure to finish compilation, leaving it in a currently unusable state.

Diagnostic data

Output of vim --version

❯ vim --version
VIM - Vi IMproved 9.0 (2022 Jun 28, compiled Jul 14 2023 00:15:07)
Included patches: 1-1403
Compiled by <https://www.msys2.org/>
Huge version without GUI.  Features included (+) or not (-):
+acl               +file_in_path      +mouse_urxvt       -tag_any_white
+arabic            +find_in_path      +mouse_xterm       -tcl
+autocmd           +float             +multi_byte        +termguicolors
+autochdir         +folding           +multi_lang        +terminal
-autoservername    -footer            -mzscheme          +terminfo
-balloon_eval      +fork()            +netbeans_intg     +termresponse
+balloon_eval_term +gettext           +num64             +textobjects
-browse            -hangul_input      +packages          +textprop
++builtin_terms    +iconv             +path_extra        +timers
+byte_offset       +insert_expand     +perl/dyn          +title
+channel           +ipv6              +persistent_undo   -toolbar
+cindent           +job               +popupwin          +user_commands
-clientserver      +jumplist          +postscript        +vartabs
+clipboard         +keymap            +printer           +vertsplit
+cmdline_compl     +lambda            +profile           +vim9script
+cmdline_hist      +langmap           -python            +viminfo
+cmdline_info      +libcall           +python3/dyn       +virtualedit
+comments          +linebreak         +quickfix          +visual
+conceal           +lispindent        +reltime           +visualextra
+cryptv            +listcmds          +rightleft         +vreplace
+cscope            +localmap          +ruby/dyn          +wildignore
+cursorbind        -lua               +scrollbind        +wildmenu
+cursorshape       +menu              +signs             +windows
+dialog_con        +mksession         +smartindent       +writebackup
+diff              +modify_fname      -sodium            -X11
+digraphs          +mouse             -sound             -xfontset
-dnd               -mouseshape        +spell             -xim
-ebcdic            +mouse_dec         +startuptime       -xpm
+emacs_tags        -mouse_gpm         +statusline        -xsmp
+eval              -mouse_jsbterm     -sun_workshop      -xterm_clipboard
+ex_extra          +mouse_netterm     +syntax            -xterm_save
+extra_search      +mouse_sgr         +tag_binary
-farsi             -mouse_sysmouse    -tag_old_static
   system vimrc file: "/etc/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
      user exrc file: "$HOME/.exrc"
       defaults file: "$VIMRUNTIME/defaults.vim"
  fall-back for $VIM: "/etc"
 f-b for $VIMRUNTIME: "/usr/share/vim/vim90"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -I/usr/include/ncursesw -march=nocona -msahf -mtune=generic -O2 -pipe -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: gcc -pipe -Wl,--as-needed -o vim.exe -lm -lncursesw -liconv -lacl -lintl -Wl,--enable-auto-import -Wl,--export-all-symbols -Wl,--enable-auto-image-base -fstack-protector-strong -L/usr/lib/perl5/core_perl/CORE -lperl -lpthread -ldl -lcrypt

Output of YcmDebugInfo

N/A

Output of YcmDiags

N/A

Output of git rev-parse HEAD in YouCompleteMe installation directory

❯ git rev-parse HEAD
142a559acd70a4da190e36b1b05b9f1eec67acd0

Contents of YCM, ycmd and completion engine logfiles

N/A

OS version, distribution, etc.

❯ uname -a
MINGW64_NT-10.0-19045 DESKTOP-2M2MTV7 3.4.7.x86_64 2023-07-14 16:57 UTC x86_64 Msys

From the Windows info itself:

• Windows 10 Pro
• 22H2
• 19045.3208
• Windows Feature Experience Pack 1000.19041.1000.0

Output of build/install commands

See log files provided earlier, gist doesn't like the 46MB one either

If any additional info is desired, please do let me know and I'll provide it ASAP. I was busy migrating my office workflow to vim, and as such I haven't uninstalled my alternative options yet. It does, however, mean I can only collect info during my office hours.

[Ben Jackson]

Sorry, mingw is not an officially supported platform. Per the instructions on README, for windows, we assume you are using cmd.exe. This works fine. Mingw can be made to work, and there is some community-supported info here: https://github.com/ycm-core/YouCompleteMe/wiki/Windows-Installation-Guide-for-Unix%E2%80%90like-Environments

As an aside, you provably shouldn't be using libclang completer nowadays (it's considered legacy); we officially recommend using clangd completer instead. To do that use install.py without --clang-completer and specify g:ycm_clangd_binary_path to a clangd that works on your mingw environment.

but I don't consider it a bug that YCM's installer/prebuilt binaries don't support mingw, so closing.