I used to run a command line as follows to generate a systag file for Vim code completion (omni-completion and echofunc):
ctags -R --c-kinds=+p --extra=+q --fields=+iaS -I … \
-o /usr/local/etc/systags /usr/include …I made small scripts on machines I work on, but now I feel there is
simply too much noise if I include whole directories recursively. Heck,
I currently can see fprintf declared in
/usr/include/php/ext/standard/basic_functions.h, and I know I
definitely do not want to see Vim show function prototypes from that
file.
So I adopted an alternative method. I’ll start from the standard C header files, and include in the ctags command line only header files that I want or need (i.e. included by the header files I want). My little script does exactly that.
I have not put in the C++ header files, as ctags probably is not a good tool for C++ code completion. For that purpose, I use clang_complete. Also be noted that it is normal for the script to complain about some missing header files, as it is not a true C preprocessor and does not deal with conditions. It is possible that it tries to find a header file that exists only on another platform.
The default include paths work for macOS Sierra (with command line
tools) and some Linux flavours (tested on Ubuntu 16.04 LTS and CentOS
7). You may need to adjust them in other environments. Also be noted the
best order is probably not the one as recognized by your compiler. This
script does not support include_next, so it is probably a better idea
to put /usr/include before your compiler-specific include paths.
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