How to use compile_commands.json in fish shell?

Question

I have fish shell installed as the default shell on my fedora machine. I recently switched to nvim and I am using deoplete-clang2 for autocomplete.

But it's only completing the names of the header files. So based on this issue I tried creating a compile_commands.json file.

[
    {
        "directory" : "/mnt/Work/Learn/Gtk/Official",
        "command" : " /usr/bin/bash echo \"/usr/bin/clang (pkg-config --cflags gtk+-3.0) -o main main.c (pkg-config --libs gtk+-3.0)\"",
        "file" : "/mnt/Work/Learn/Gtk/Official/main.c"
    }
]

But when I run clang-check main.c to verify the commands the following errors are thrown.

error: unsupported option '--cflags'
error: unsupported option '--libs'
warning: (pkg-config: 'linker' input unused [-Wunused-command-line-argument]
warning: gtk+-3.0): 'linker' input unused [-Wunused-command-line-argument]
warning: (pkg-config: 'linker' input unused [-Wunused-command-line-argument]
warning: gtk+-3.0): 'linker' input unused [-Wunused-command-line-argument]
In file included from main.c:2:
/usr/include/gtk-3.0/gtk/gtk.h:30:10: fatal error: 'gdk/gdk.h' file not found
#include <gdk/gdk.h>
         ^~~~~~~~~~~
1 error generated.
Error while processing /mnt/Work/Learn/Gtk/Official/main.c.

So how do I fix this. Thanks

Answer 1

This is explicitly executing bash , not fish.

"command" : " /usr/bin/bash echo \"[...]

You can change that by using "/usr/bin/fish" instead of bash (adjust the path if that's not where you have installed fish).

Alternatively, you just need to change the () to $() - that's where the error comes from. command1 (command2 arg1 arg2) isn't valid syntax in bash, and will just be passed as-is to command1 (ie it'll receive (command2 , arg1 and arg2) as its arguments).

Change it to

"command" : " /usr/bin/bash echo \"/usr/bin/clang $(pkg-config --cflags gtk+-3.0) -o main main.c $(pkg-config --libs gtk+-3.0)\""

and it should work. (Note the $ s)

---

If you do decide to use fish, note that pkg-config expects its output to be split on spaces, which fish doesn't do (only newlines). So you'd need to pipe it to string split " " , like

(pkg-config --libs gtk+-3.0 | string split " ")