Include headers and FreeType .ccls

[513ry]

Observed behavior

I have actually two problems with this config, so please tell me if I should break this issue into smaller once.

I am trying to reassemble this simple directory structure

├── include
│   ├── my_lib.h
│   └── my_lib
│       └── common.h
├── src
│   └── my_lib.c
└── .ccls

My project use XCB and FreeType, so I included those into my .ccls as well

gcc
-std=c99
-Iinclude
%c -lxcb
%c -lxcb-randr
%c `pkg-config --cflags freetype2`
%c `pkg-config --libs freetype2`

Example with my library code

Expected behavior

I can't get my source directory to see include files.

Second problem is that ccls does seem to recognize the freetype2/ft2build.h header but types and functions defined by it (e.g. FT_Library) are reported as undeclared.

Steps to reproduce

1. For a minimal reproducible example go

mkdir include src

2. Create .ccls file in root directory

gxx
-xc
-std=c99
-Iinclude
%c `pkg-config --cflags freetype2`
%c `pkg-config --libs freetype2`

3. Add CMakeLists.txt to root directory

cmake_minimum_required(VERSION 3.16)
project(test VERSION 0.1.0)

set(CMAKE_C_STANDARD 99)
set(CMAKE_BUILD_TYPE Debug)
set(CMAKE_C_STANDARD_REQUIRED YES)
set(CMAKE_C_EXTENSIONS OFF)

find_package(Freetype REQUIRED)

add_executable(${PROJECT_NAME} src/main.c)

target_link_libraries(${PROJECT_NAME}
  PRIVATE
  ${FREETYPE_LIBRARIES})

target_include_directories(${PROJECT_NAME}
  PRIVATE
  include
  ${FREETYPE_INCLUDE_DIRS})

4. Add the include header

// include/test.h
#ifndef _TEST_H
#define _TEST_H

extern int value = 665;

#endif // _TEST_H

5. And finally add a source file

// src/main.c
#include "test.h"
#include <freetype2/ft2build.h>
#include FT_FREETYPE_H
#include "stdio.h"
#include <stddef.h>

static FT_Library ft = NULL;

int main(void) {
  printf("value: %i\n", value);
  return 0;
}

System information

• clang version: 0.20240202-1
• OS: Arch Linux
• Editor: Emacs (nvim gives me the same result)
• Language client (and version): emacs-ccls 20240331.2132

[FederAndInk]

if you are using cmake, try using compile_commands.json instead of .ccls, e.g. set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

either way, I don't think ccls will interpret commands in a .ccls file, your issue is probably that you're trying to use `pkg-config ...` where you should only put flags directly

take a look at this page for more details: https://github.com/MaskRay/ccls/wiki/Project-Setup

[513ry]

@FederAndInk I have tried to put flags returned by pkg_config directly, with the same result. I used pkg_config here for short.