Trying to change clangd's c++ standard.

[Mike-Mp]

std::string toString() {
std::string stringValue = std::visit(
[](const auto &value) { return std::to_string(value); }, this->literal);
}

I get "no matching function for call to 'visit'". I understand that this is because clangd is using a standard below c++17.

In my project directory I have a compile_flags.txt:

-std=c++20 -Wall -I/usr/lib/gcc/x86_64-redhat-linux/13/include -L/usr/lib/gcc/x86_64-redhat-linux/13/
This is my languages.toml:

[[language]]
name = "cpp"
scope = "source.cpp"
injection-regex = "cpp"
file-types = ["cc", "hh", "c++", "cpp", "hpp", "h", "ipp", "tpp", "cxx", "hxx", "ixx", "txx", "ino", "C", "H", "cu", "cuh", "cppm"]
roots = []
comment-token = "//"
indent = { tab-width = 2, unit = " " }
auto-format = true
config = {"clangd.fallbackFlags" = [ "-std=c++20" ] }

What am I doing wrong?

[h1t]

Did you try this snippet?

[language-server.clangd]
config = { "clangd.fallbackFlags" = [ "-std=c++20" ] }
auto-format = true

[sgj123456]

I tried, but it still doesn't work

[Lisible]

I'm having the same problem here, trying to set the standard to c2x but clangd still outputs warnings related to -Wdeclaration-after-statement, even though this shouldn't output any warning using any standard >=c99.

EDIT: Might be a clangd issue, I'm reproducing it on VSCodium with clangd extension. I will investigate further if I have some time.

[sgj123456]

I'm having the same problem here, trying to set the standard to c2x but clangd still outputs warnings related to -Wdeclaration-after-statement, even though this shouldn't output any warning using any standard >=c99.

EDIT: Might be a clangd issue, I'm reproducing it on VSCodium with clangd extension. I will investigate further if I have some time.

I found that using cmake is recommended in wikis, and it works normally after I use it