Invalid ccls errors

[LesnyRumcajs]

Observed behavior

Given this code:

#include <iostream>
#include <memory>

struct S {
  auto hello() -> void {
    std::cout << "hello\n";
  }
};

int main() {
  auto s = std::make_shared<S>();
  s->hello();
}

I get the error messages: On line 7:

[ccls 2] [E] invalid operands to binary expression ('std::__1::ostream' (aka 'int') and 'const char [7]')

On line 12:

[ccls 2] [E] no matching function for call to 'make_shared'

Like so:

Which is strange, because it is valid and code compiles fine and executes fine. I'm not sure what is the source of those errors. Perhaps I have my ccls somehow misconfigured - code like this doesn't pop up any errors, though it should fail at invalid method:

#include <iostream>
#include <string>


int main() {
  std::cout << std::string().len2();
}

Going to the definition works of std::string works fine (?), I get straight to /Library/Developer/CommandLineTools/usr/include/c++/v1/iosfwd . Perhaps it should be the string header and not the forward declaration? No idea how could I enforce it though. The member methods of string class are not suggested.

Expected behavior

No errors are highlighted given the sample code and members of std::string are suggested.

System information

• ccls version: ccls-0.20201219 installed with brew
• clang version: Apple clang version 12.0.0 (clang-1200.0.32.28)
• OS: MacOS Catalina 10.15.7
• Editor: NVIM v0.4.4
• Language client (and version): coc.nvim 0.0.80-fff2a86b16

ccls config

"languageserver": {
      "ccls": {
      "command": "ccls",
      "filetypes": ["c", "cpp", "objc", "objcpp"],
      "rootPatterns": [".ccls", "compile_commands.json", ".vim/", ".git/", ".hg/"],
      "initializationOptions": {
         "client": {
          "snippetSupport": true
         },
         "cache": {
           "directory": "/tmp/ccls"
         },
         "clang": {
          "resourceDir": "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include",
          "extraArgs": [
            "-std=c++2a",
            "-isysroot", "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include",
            "-isystem", "/Library/Developer/CommandLineTools/usr/include/c++/v1",
          ]
        }
       }
    }
  }

Possible issue (not sure) - ccls --version says clang version 11.0.0 though my default one is 12.0.0.

[rhcher]

meet same issue with AUR ccls, and I solved it by building ccls from source.

[LesnyRumcajs]

@rhcher thanks for the suggestion, I tried it out and the error persists (though at least now the ccls --version shows a proper tag, with brew I had unknown)

❯ ccls --version                                                                                                                                                                                    
ccls version 0.20201219-3-g40145807
clang version 11.0.0

[rhcher]

Maybe you can specify the clang version when configruating with adding this: -DCMAKE_CXX_COMPILER=clang++

[LesnyRumcajs]

cmake -H. -BRelease -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=/usr/local/Cellar/llvm/11.0.0_1/lib/cmake -DCMAKE_CXX_COMPILER=(which clang++) cmake --build Release --target install

I'm configuring it and installing using the commands above. Still bogus errors from the standard library.

[uninhm]

Same issue here

[zoshima]

Also got the same issue after upgrading my brew packages. Installing the unstable (--HEAD) version of ccls resolved it for me.