No completions for STL classes (such as string)

[kriskalish]

I'm on Ubuntu 13.04 using a custom-built vim.
I mostly followed the quick install instructions, except I opted to use the system libclang.

If I make a very simple file and use a simple .ym_extra_conf.py that's basically a copy, paste job from the YCM version and make the following file:

//simple.cpp
#include <string>

int main()
{
    std::string mystring;
    mystring.
}

when I type "mystring." I get a "User defined completion (^U^N^P) Pattern not found" message printed to the status line:

Here is the output of :YcmDiags
Forcing compilation, this will block Vim until done.
No warnings or errors detected

Here is the output of :messages
"simple.cpp" 7L, 75C
No completions found; errors in file?

The simple completions seem to work, such as finishing "mystring" for me, but not the meaningful syntactic ones. I'm kind of at a loss as to how to debug this thing further since the output of YcmDiags suggests that the file is being built properly, and thus finding string.h on my system.

Any help is appreciated,
Kris

[Valloric]

Unable to reproduce. I took your test case and used YCM's .ycm_extra_conf.py file and I got semantic completions after mystring. just fine.

You probably made a mistake in your extra conf file.

[NoSohoth]

Had the same problem for a while, I just figured it out : it's indeed a mistake in ycm_extra_conf.py but kind of a tricky one.
The clang completer doesn't currently support c++14, and adding '-std=c++14' to the flag list was the source of the problem.

Solution : Use c++11 or c++1y instead.