c Headers autocomplete

[yotamN]

after I realize what to do with the .ycm_extra_conf I edited the flags to this:

flags = [
'-Wall',
# '-Wextra',
# '-Werror',
# '-Wc++98-compat',
# '-Wno-long-long',
# '-Wno-variadic-macros',
# '-fexceptions',
# '-DNDEBUG',
# You 100% do NOT need -DUSE_CLANG_COMPLETER in your flags; only the YCM
# source code needs it.
# '-DUSE_CLANG_COMPLETER',
# THIS IS IMPORTANT! Without a "-std=<something>" flag, clang won't know which
# language to use when compiling headers. So it will guess. Badly. So C++
# headers will be compiled as C headers. You don't want that so ALWAYS specify
# a "-std=<something>".
# For a C project, you would set this to something like 'c99' instead of
# 'c++11'.
'-std=c99',
# ...and the same thing goes for the magic -x option which specifies the
# language that the files to be compiled are written in. This is mostly
# relevant for c++ headers.
# For a C project, you would set this to 'c' instead of 'c++'.
'-x',
'c',
#'-isystem',
#'../BoostParts',
#'-isystem',
# This path will only work on OS X, but extra paths that don't exist are not
# harmful
#'/System/Library/Frameworks/Python.framework/Headers',
# '-isystem',
# '../llvm/include',
# '-isystem',
# '../llvm/tools/clang/include',
'-I',
'.',
#'-I',
#'./ClangCompleter',
'-isystem',
'/usr/include'
#'-isystem',
#'./tests/gmock/gtest',
#'-isystem',
#'./tests/gmock/gtest/include',
#'-isystem',
#'./tests/gmock',
#'-isystem',
#'./tests/gmock/include',
]

But I don't get autocomplete from the headers, only from the code I have in the file I'm in.

I got this error: native filetype completion not supported for current file, What am I doing wrong?

[vheon]

Looks like you didn't compile the semantic engine in.

How did you install YCM?

[yotamN]

@vheon IIRC I did it like this:

cd ~/.vim/bundle/YouCompleteMe
./install.py --clang-completer

[puremourning]

What does :YcmDebugInfo say? Take a look at CONTRIBUTING.md

[yotamN]

@puremourning The output is:

Printing YouCompleteMe debug information...
-- Server has Clang support compiled in: True
-- Clang version: clang version 3.6.2 (tags/RELEASE_362/final)
-- Flags for /home/yotam/Documents/c/1.c loaded from /home/yotam/Documents/c/.ycm_extra_conf.py:
-- ['-x', 'c++', '-isystem', '/home/yotam/.vim/bundle/YouCompleteMe/third_party/ycmd/ycmd/../clang_includes']
-- Server running at: http://127.0.0.1:58175
-- Server process ID: 868
-- Server logfiles:
--   /tmp/ycm_temp/server_58175_stdout.log
--   /tmp/ycm_temp/server_58175_stderr.log

[micbou]

The flags in the :YcmDebugInfo output do not correspond to the flags in your first post. Could you give us the whole content of the .ycm_extra_conf.py file in the ~/Documents/c/ folder?

[micbou]

No answer, I am closing this.

[hanetzer]

I think I'm having the same issue; I installed with pathogen, git cloned and updated the submodules and ran python2 setup.py --clang-completer, think I have my ycm_extra_conf.py setup right (proper -I directives to where I expect the headers to be), but its not completing from anything other than what's inside the currently edited file (granted that is useful, but not as useful as I'd like); :YcmDebugInfo apparently isn't getting my flags somehow, it shows them as being []
.ycm_conf_extra.py

[micbou]

What is the full output of :YcmDebugInfo?

[hanetzer]

Added to the previous gist

[micbou]

The issue is at the line 89 of your .ycm_extra_conf. If you are not using a compilation database, you need to leave this variable as an empty string:

compilation_database_folder = ''

If you are using one, you need to specify an absolute path (containing the compile_commands.json file), not a relative one.

[hanetzer]

Ah crap. I take it that the flags [] and compilation_database_folder are mutually exclusive?

[micbou]

This is how it works in this .ycm_extra_conf.py file but you could change the logic.

[hanetzer]

Question... with that settled most things seem to work, but some issues still remain. If I define a function in a header, and switch to a source file that includes it, should i be able to complete those functions using ycm? because if so, I'm not seeing this behavior.

[vheon]

So you are in the src file, press <C-Space> and the function don't get suggested?

[hanetzer]

Just noticed that when googling around. I expected it to be a part of the tab complete, can one remap it?

[micbou]

See the README.md.

[Grayninja]

The /usr/include is not enough to get C++ header completion. Try adding additional header location based on compiler version X.Y.Z (e.g. gcc version 6.1.1):

'-isystem',
'/usr/include/c++/X.Y.Z',