Qt Creator - Clang Code Model with GNU code

[dawnwhite]

How can I tell the Code Model to use '-std=gnu11' ?
So that it wouldn't flag things like nested functions as "error: function definition is not allowed here".

When I try to add it as "Diagnostic Configuration" I get told: 'Option "-std=gnu11" is invalid.'
Is this a limitation from libclang, or is the Option-validation-checker too strict?

Thanks

[kshegunov]

@dawnwhite said in Qt Creator - Clang Code Model with GNU code:

So that it wouldn't flag things like nested functions as "error: function definition is not allowed here".

Well, this is not standard C++, so don't do it to begin with. Use an anonymous struct/class instead:

void function()
{
    struct {
       void operator () (int a)
       {
       }
    } nested;
    
    int b = 0;
    nested(b);
}

Or simply use a lambda.

When I try to add it as "Diagnostic Configuration" I get told: 'Option "-std=gnu11" is invalid.'
Is this a limitation from libclang, or is the Option-validation-checker too strict?

I don't believe libclang supports gnu extensions.

[dawnwhite]

Thank your for your response!

so don't do it to begin with.

I work with an large existing code base, so this is not an option. Think of the linux kernel for example.

I was able to set -std=gnu11 by editing ~/.config/QtProject/QtCreator.ini manually, and now many gcc extensions are supported.
It would be great if this was supported by the gui somehow. A quick hack would be to whitelist -std=* in isValidOption.

I don't believe libclang supports gnu extensions.

While nested functions indeed seem to be unsupported, many GNU extensions are supported! From LanguageExtensions.html: Clang aims to support a broad range of GCC extensions.

[kshegunov]

@dawnwhite said in Qt Creator - Clang Code Model with GNU code:

I work with an large existing code base, so this is not an option. Think of the linux kernel for example.

Think refactoring. I sure hope the kernel doesn't require extensions to the C language just to compile.

I was able to set -std=gnu11 by editing ~/.config/QtProject/QtCreator.ini manually, and now many gcc extensions are supported.

Thanks for sharing!

While nested functions indeed seem to be unsupported, many GNU extensions are supported! From LanguageExtensions.html: Clang aims to support a broad range of GCC extensions.

Well, yeah, I mean in the general sense of "all" gnu extensions. People try to play nice, and personally I like to use the gcc attributes with clang as well.