Doesn't grab compilation command of a precompiled header

[laralex]

Describe the bug
Can't make Bear to append the compilation command of a precompiled header into compile_commands.json

To Reproduce
Make a header file test.hpp

#include <iostream>

inline void test(int a, int b) {
    std::cout << a + b;
}

Run Bear to generated the precompiled header

bear clang++ -std=c++20 -g -c -o test.hpp.pch -xc++-header test.hpp

Expected behavior
compile_commands.json should contain the compilation command, clangd is perfectly capable of interacting with it for code completion

[
   {
       "arguments": [
            "clang++",
            "-std=c++20",
            "-g",
            "-c",
            "-o",
            "test.hpp.pch",
            "-xc++-header",
            "test.hpp"
        ],
        "directory": "/home/user/test",
        "file": "test.hpp.pch"
    }
]

Instead compile_commands.json is just

[]

Environment:

• OS name: Linux
• OS version: Ubuntu 20.04.6 LTS
• OS architecture: x86_64
• Bear version: 2.4.3
• Bear install method: sudo apt install bear

Additional context

• Can you give us a reference to the project that you are running against this tool?
  Here's the link, though I reproduce the bug in isolation (as described above) https://github.com/laralex/RenderingExperiments
• What architecture you are trying to compile for? native

[rizsotto]

Hey @laralex , thanks for the report.

Yes, Bear does not put precompiled header into the output. This was a kind of design decision, because I have not seen use of it. Give me some time to implement it. Will keep the ticket open.

[laralex]

@rizsotto I tried to build v3.1.5 from source, it seems to work already. Though I wonder why Ubuntu 20.04 is packaged with such an old version 2.4.3