How to configure .ycm_extra_conf.py for current project include PATH

Question

I installed YCM and syntastic for VIM, normally they work fine, but I have problem when it detect some errors in my code, it shows that can NOT find some head files(which is my project head file).

My directory tree shows below:

TOP
├── debug
│   ├── debug.c
│   ├── debug.h
│   ├── debug.mk
│   └── instrument.c
├── driver
│   ├── driver.c
│   ├── driver_ddi.c
│   ├── driver_ddi.h
│   ├── driver.h
│   └── driver.mk
├── include
│   └── common.h
├── libs
├── Makefile
├── mw
│   ├── manager.c
│   └── mw.mk
└── root
    ├── main.c
    └── root.mk

I copied a .ycm_extra_conf.py to the TOP, meanwhile, I will generated tag and cscope file at TOP as well, therefore each time I open file on TOP, like:

howchen@host:~/Work/c/sample/src
-> gvim ./driver/driver.c

to make sure each time I can add tag and cscope file in VIM. The problem is, if I open driver.c, which contain head files： driver.h, driver_ddi.h, debug.h, common.h, code like below:

#include <stdio.h>
#include <stdlib.h>
#include "math.h"
#include "common.h"
#include "debug.h"
#include "driver_ddi.h"
#include "driver.h"

the syntastic or YCM always show it can NOT find common.h and debug.h, other head files are OK.

My YCM and syntastic config part in vimrc file:

" YCM
"   let g:ycm_extra_conf_globlist = ['~/.vim/bundle/YouCompleteMe/cpp/ycm/*','!~/*']
    let g:ycm_global_ycm_extra_conf = '~/.vim/bundle/YouCompleteMe/cpp/ycm/.ycm_extra_conf.py'

" Syntastic
    let g:syntastic_c_checkers=['make']
    let g:syntastic_always_populate_loc_list = 1
    let g:syntastic_check_on_open=1
    let g:syntastic_enable_signs=1
    let g:syntastic_error_symbol = '✗'
    let g:syntastic_warning_symbol = '⚠'
    set statusline+=%#warningmsg#
    set statusline+=%{SyntasticStatuslineFlag()}
    set statusline+=%*gbar

My .ycm_extra_conf.py write flags variable as:

flags = [
'-Wall',
'-Wextra',
'-Werror',
'-Wc++98-compat',
'-Wno-long-long',
'-Wno-variadic-macros',
'-fexceptions',
'-DNDEBUG',
'-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', #I don't know if I need remove -x
'c',
'-isystem',
'../llvm/include',
'-isystem',
'../llvm/tools/clang/include',
'-I',
'.',
'-I',
'../driver'
'-I',
'../debug'
'-I',
'../include'
'-I',
'../include'
]

any wrong flags I set?

Answer 1

Moved here from the question.

I found the problem:

flags = [
'-Wall',
'-Wextra',
'-Werror',
'-Wc++98-compat',
'-Wno-long-long',
'-Wno-variadic-macros',
'-fexceptions',
'-DNDEBUG',
'-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', #I don't know if I need remove -x
'c',
'-isystem',
'../llvm/include',
'-isystem',
'../llvm/tools/clang/include',
'-I./driver',
'-I./debug',
'-I./include',
]

I missed a comma and path should be ./xxx, also neeeeed '-I/usr/include', and '-I/usr/local/include'.